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Architect's & Engineer's Specifications
ISA Series
ISA 280
ARCHITECT'S AND ENGINEER'S SPECIFICATIONS
The amplifier shall contain all solid-state circuitry, using complementary silicon output devices. The amplifier shall operate from 50-60 Hz AC power. The amplifier shall draw 540 VA or less when driven with random program material at 1/8 rated power into four-ohm loads. The amplifier shall be equipped with a 320-C19 16A IEC mains connector and a removable power cord. Units configured for 120V use shall have an 8A circuit breaker on the rear panel and operate safely from a 15A 120V AC outlet, and their power cords shall have a standard NEMA AC plug. Units configured for 230V use shall have a 4A circuit breaker on the rear panel and shall have a power cord with a standard Schuko AC plug. The amplifier shall comply with FCC part 15 Class B requirements.
The amplifier shall employ forced-air cooling with a temperature-controlled fan, variable in speed from zero to full for minimum acoustic noise. Airflow shall be from rear to front to avoid temperature rise inside the rack. Rack mounting shall be possible without clearance between amplifiers for ventilation. The amplifier shall be capable of continuous operation at 1/3 power into four-ohm loads, in ambient temperatures up to 104°F (40°C).
The amplifier shall contain two independent amplifier channels powered by a conventional power supply with a toroidal transformer. All amplifier protection systems shall be synchronized and self-resetting upon removal of fault.
Each channel shall have circuitry to protect against short circuits or mismatched loads. Each channel shall independently monitor heat sink temperature to control the fan speed and if necessary, mute the signal to prevent excessive temperature. Both channels shall mute for several seconds after turn-on, and within 1/4 second after turn-off or loss of AC power. Each channel's output section shall be AC coupled to protect the load against DC faults.
Each channel shall have an independent and defeatable clip limiter and 12 dB per octave high-pass filter. The corner frequency of the filter shall be selectable between 30 and 70 Hz. Each channel's output section shall operate in Class AB+B. The front panel shall contain these features: an AC power switch; a green LED status indicator for power; independent LED channel output indicators for signal present or -30 dB (green), and clip (red). The gain controls shall be located on the rear panel and have 11 detents. They shall be labeled in dB of attenuation, from 0 to infinity. From 0 to 14 dB, the attenuation steps shall be 2 dB per detent. The labeled attenuation settings shall be 0, 4, 10, 18, 25, and ∞ dB.
The output connector for both channels shall be a barrier strip located on the rear panel, with screw terminals and a safety shroud. The terminals shall be arranged to facilitate bridged mono connection.
The inputs shall be located on the rear panel, consisting of a 3-pin detachable terminal block and a 3-pin XLR connector for each channel. The XLR input shall be wired with pin 2 high. Inputs shall be electronically balanced, with a minimum impedance of 20 kilohms balanced and 10 kilohms unbalanced, and a common mode rejection of at least 50 dB from 20 Hz to 20 kHz.
A High Density 15-pin DataPort connector shall be provided for carrying both audio and amplifier operational status signals to and from a QSControl network. The DataPort shall also accommodate plug-in crossover filters and other such accessories. A set of DIP switches on the rear panel shall be provided for: setting bridged mono and parallel-input operation; selecting clip limiters; and selecting high-pass filters and setting their frequencies.
Each channel shall be capable of meeting the following performance criteria with both channels driven: Sine-wave output power of 185 watts into 8 ohms, 20 Hz to 20 kHz at <0.03% THD; 280 watts into 4 ohms, 20 Hz to 20 kHz at <0.05% THD; and 430 watts into 2 ohms, 1 kHz at <1% THD.
Frequency response (with filters not engaged) at 3 dB below rated power shall be 20 Hz to 20 kHz ±0.2 dB. The maximum voltage gain shall be 33.4x, equivalent to 30.5 dB, and the 8-ohm input sensitivity shall be 1.15 Vrms (+3.4 dBu). The unweighted signal to noise ratio over the range of 20 Hz to 20 kHz shall exceed 100 dB, referenced to full output. IHF damping factor shall exceed 200 with an 8-ohm load.
The amplifier chassis shall occupy three rack spaces and have provisions for securing the rear corners. Depth from mounting surface to tips of rear supports shall be 15.9" (40.4 cm).
The amplifier's weight shall not exceed 36 lb. (16.3 kg). The amplifier shall be the QSC Audio Products ISA 280.
TOP
ISA 300Ti
ARCHITECT'S AND ENGINEER'S SPECIFICATIONS
The amplifier shall contain all solid-state circuitry, using complementary silicon output devices. The amplifier shall operate from 50-60 Hz AC power. The amplifier shall draw 540 VA or less when driven with random program material at 1/8 rated power into four-ohm loads. The amplifier shall be equipped with a 320-C19 16A IEC mains connector and a removable power cord. Units configured for 120V use shall have an 8A circuit breaker on the rear panel and operate safely from a 15A 120V AC outlet, and their power cords shall have a standard NEMA AC plug. Units configured for 230V use shall have a 4A circuit breaker on the rear panel and shall have a power cord with a standard Schuko AC plug. The amplifier shall comply with FCC part 15 Class B requirements.
The amplifier shall employ forced-air cooling with a temperature-controlled fan, variable in speed from zero to full for minimum acoustic noise. Airflow shall be from rear to front to avoid temperature rise inside the rack. Rack mounting shall be possible without clearance between amplifiers for ventilation. The amplifier shall be capable of continuous operation at 1/3 power into four-ohm loads, in ambient temperatures up to 104°F (40°C).
The amplifier shall contain two independent amplifier channels powered by a conventional power supply with a toroidal transformer. All amplifier protection systems shall be synchronized and self-resetting upon removal of fault. Each channel shall have circuitry to protect against short circuits or mismatched loads. Each channel shall independently monitor heat sink temperature to control the fan speed and if necessary, mute the signal to prevent excessive temperature. Both channels shall mute for several seconds after turn-on, and within 1/4 second after turn-off or loss of AC power. Each channel's output section shall be AC coupled to protect the load against DC faults.
Each channel shall have an independent and defeatable clip limiter and a 12 dB per octave high-pass filter. The corner frequency of the filter shall be selectable between 50 and 75 Hz. Each channel's output section shall operate in Class AB+B.
The front panel shall contain these features: an AC power switch; a green LED status indicator for power; independent LED channel output indicators for signal present or -30 dB (green), and clip (red). The gain controls shall be located on the rear panel and have 11 detents. They shall be labeled in dB of attenuation, from 0 to infinity. From 0 to 14 dB, the attenuation steps shall be 2 dB per detent. The labeled attenuation settings shall be 0, 4, 10, 18, 25, and ∞ dB.
The amplifier shall be designed to drive load impedances as low as 2 ohms per channel, and each output shall have an internal toroidal transformer with taps at 25, 70, and 100 volts for driving distributed lines. The output connectors for both channels shall be barrier strips located on the rear panel, with screw terminals and a safety shroud. There shall be terminals for both low-impedance and 25-, 70-, and 100-volt operation.
The inputs shall be located on the rear panel, consisting of a 3-pin detachable terminal block and a 3-pin XLR connector for each channel. The XLR input shall be wired with pin 2 high. Inputs shall be electronically balanced, with a minimum impedance of 20 kilohms balanced and 10 kilohms unbalanced, and a common mode rejection of at least 50 dB from 20 Hz to 20 kHz.
A High Density 15-pin DataPort connector shall be provided for carrying both audio and amplifier operational status signals to and from a QSControl network. The DataPort shall also accommodate plug-in crossover filters and other such accessories.
A set of DIP switches on the rear panel shall be provided for: setting bridged mono and parallel-input operation; selecting clip limiters; and selecting high-pass filters and setting their frequencies.
Each channel shall be capable of meeting the following performance criteria with both channels driven: Sine-wave output power of 185 watts into 8 ohms, 20 Hz to 20 kHz at <0.03% THD; 280 watts into 4 ohms, 20 Hz to 20 kHz at <0.05% THD; 430 watts into 2 ohms, 1 kHz at <1% THD; 300 watts at 70 or 100 volts, 50 Hz to 16 kHz at <0.5% THD, and 240 watts at 25 volts, 50 Hz to 16 kHz at <0.5% THD.
Frequency response (with filters not engaged) at 3 dB below rated power shall be 20 Hz to 20 kHz ±0.2 dB. The maximum voltage gain at the low-impedance outputs shall be 33.4x, equivalent to 30.5 dB, and the 8-ohm input sensitivity shall be 1.15 Vrms (+3.4 dBu). The unweighted signal to noise ratio over the range of 20 Hz to 20 kHz shall exceed 100 dB, referenced to full output. IHF damping factor shall exceed 200 with an 8-ohm load.
The amplifier chassis shall occupy three rack spaces and have provisions for securing the rear corners. Depth from mounting surface to tips of rear supports shall be 15.9" (40.4 cm).
The amplifier's weight shall not exceed 44 lb. (20 kg). The amplifier shall be the QSC Audio Products ISA 300Ti.
TOP
ISA 450
ARCHITECT'S AND ENGINEER'S SPECIFICATIONS
The amplifier shall contain all solid-state circuitry, using complementary silicon output devices. The amplifier shall operate from 50-60 Hz AC power. The amplifier shall draw 720 VA or less when driven with random program material at 1/8 rated power into four-ohm loads. The amplifier shall be equipped with a 320-C19 16A IEC mains connector and a removable power cord. Units configured for 120V use shall have a 15A circuit breaker on the rear panel and operate safely from a 15A 120V AC outlet, and their power cords shall have a standard NEMA AC plug. Units configured for 230V use shall have an 8A circuit breaker on the rear panel and shall have a power cord with a standard Schuko AC plug. The amplifier shall comply with FCC part 15 Class B requirements.
The amplifier shall employ forced-air cooling with a temperature-controlled fan, variable in speed from zero to full for minimum acoustic noise. Airflow shall be from rear to front to avoid temperature rise inside the rack. Rack mounting shall be possible without clearance between amplifiers for ventilation. The amplifier shall be capable of continuous operation at 1/3 power into four-ohm loads, in ambient temperatures up to 104°F (40°C).
The amplifier shall contain two independent amplifier channels powered by a conventional power supply with a toroidal transformer. All amplifier protection systems shall be synchronized and self-resetting upon removal of fault. Each channel shall have circuitry to protect against short circuits or mismatched loads. Each channel shall independently monitor heat sink temperature to control the fan speed and if necessary, mute the signal to prevent excessive temperature. Both channels shall mute for several seconds after turn-on, and within 1/4 second after turn-off or loss of AC power.
Each channel's output section shall be AC coupled to protect the load against DC faults. Each channel shall have an independent and defeatable clip limiter and 12 dB per octave high-pass filter. The corner frequency of the filter shall be selectable between 30 and 70 Hz. Each channel's output section shall operate in Class AB+B.
The front panel shall contain these features: an AC power switch; a green LED status indicator for power; independent LED channel output indicators for signal present or -30 dB (green), and clip (red). The gain controls shall be located on the rear panel and have 11 detents. They shall be labeled in dB of attenuation, from 0 to infinity. From 0 to 14 dB, the attenuation steps shall be 2 dB per detent. The labeled attenuation settings shall be 0, 4, 10, 18, 25, and ∞ dB. The output connector for both channels shall be a barrier strip located on the rear panel, with screw terminals and a safety shroud. The terminals shall be arranged to facilitate bridged mono connection.
The inputs shall be located on the rear panel, consisting of a 3-pin detachable terminal block and a 3-pin XLR connector for each channel. The XLR input shall be wired with pin 2 high. Inputs shall be electronically balanced, with a minimum impedance of 20 kilohms balanced and 10 kilohms unbalanced, and a common mode rejection of at least 50 dB from 20 Hz to 20 kHz.
A High Density 15-pin DataPort connector shall be provided for carrying both audio and amplifier operational status signals to and from a QSControl network. The DataPort shall also accommodate plug-in crossover filters and other such accessories. A set of DIP switches on the rear panel shall be provided for: setting bridged mono and parallel-input operation; selecting clip limiters; and selecting high-pass filters and setting their frequencies.
Each channel shall be capable of meeting the following performance criteria with both channels driven: Sine-wave output power of 260 watts into 8 ohms, 20 Hz to 20 kHz at <0.03% THD; 425 watts into 4 ohms, 20 Hz to 20 kHz at <0.05% THD; and 700 watts into 2 ohms, 1 kHz at <1% THD.
Frequency response (with filters not engaged) at 3 dB below rated power shall be 20 Hz to 20 kHz ±0.2 dB. The maximum voltage gain shall be 44.7x, equivalent to 33 dB, and the 8-ohm input sensitivity shall be 1.07 Vrms (+2.8 dBu). The unweighted signal to noise ratio over the range of 20 Hz to 20 kHz shall exceed 100 dB, referenced to full output. IHF damping factor shall exceed 200 with an 8-ohm load.
The amplifier chassis shall occupy three rack spaces and have provisions for securing the rear corners. Depth from mounting surface to tips of rear supports shall be 15.9" (40.4 cm).
The amplifier's weight shall not exceed 42 lb. (19 kg). The amplifier shall be the QSC Audio Products ISA 450.
TOP
ISA 500Ti
ARCHITECT'S AND ENGINEER'S SPECIFICATIONS
The amplifier shall contain all solid-state circuitry, using complementary silicon output devices. The amplifier shall operate from 50-60 Hz AC power. The amplifier shall draw 720 VA or less when driven with random program material at 1/8 rated power into four-ohm loads. The amplifier shall be equipped with a 320-C19 16A IEC mains connector and a removable power cord. Units configured for 120V use shall have a 15A circuit breaker on the rear panel and operate safely from a 15A 120V AC outlet, and their power cords shall have a standard NEMA AC plug. Units configured for 230V use shall have an 8A circuit breaker on the rear panel and shall have a power cord with a standard Schuko AC plug. The amplifier shall comply with FCC part 15 Class B requirements.
The amplifier shall employ forced-air cooling with a temperature-controlled fan, variable in speed from zero to full for minimum acoustic noise. Airflow shall be from rear to front to avoid temperature rise inside the rack. Rack mounting shall be possible without clearance between amplifiers for ventilation. The amplifier shall be capable of continuous operation at 1/3 power into four-ohm loads, in ambient temperatures up to 104°F (40°C).
The amplifier shall contain two independent amplifier channels powered by a conventional power supply with a toroidal transformer. All amplifier protection systems shall be synchronized and self-resetting upon removal of fault. Each channel shall have circuitry to protect against short circuits or mismatched loads. Each channel shall independently monitor heat sink temperature to control the fan speed and if necessary, mute the signal to prevent excessive temperature. Both channels shall mute for several seconds after turn-on, and within 1/4 second after turn-off or loss of AC power. Each channel's output section shall be AC coupled to protect the load against DC faults.
Each channel shall have an independent and defeatable clip limiter and a 12 dB per octave high-pass filter. The corner frequency of the filter shall be selectable between 50 and 75 Hz. Each channel's output section shall operate in Class AB+B.
The front panel shall contain these features: an AC power switch; a green LED status indicator for power; independent LED channel output indicators for signal present or -30 dB (green), and clip (red). The gain controls shall be located on the rear panel and have 11 detents. They shall be labeled in dB of attenuation, from 0 to infinity. From 0 to 14 dB, the attenuation steps shall be 2 dB per detent. The labeled attenuation settings shall be 0, 4, 10, 18, 25, and ∞ dB.
The amplifier shall be designed to drive load impedances as low as 2 ohms per channel, and each output shall have an internal toroidal transformer with taps at 25, 70, and 100 volts for driving distributed lines. The output connectors for both channels shall be barrier strips located on the rear panel, with screw terminals and a safety shroud. There shall be terminals for both low-impedance and 25-, 70-, and 100-volt operation.
The inputs shall be located on the rear panel, consisting of a 3-pin detachable terminal block and a 3-pin XLR connector for each channel. The XLR input shall be wired with pin 2 high. Inputs shall be electronically balanced, with a minimum impedance of 20 kilohms balanced and 10 kilohms unbalanced, and a common mode rejection of at least 50 dB from 20 Hz to 20 kHz.
A High Density 15-pin DataPort connector shall be provided for carrying both audio and amplifier operational status signals to and from a QSControl network. The DataPort shall also accommodate plug-in crossover filters and other such accessories. A set of DIP switches on the rear panel shall be provided for: setting bridged mono and parallel-input operation; selecting clip limiters; and selecting high-pass filters and setting their frequencies.
Each channel shall be capable of meeting the following performance criteria with both channels driven: Sine-wave output power of 260 watts into 8 ohms, 20 Hz to 20 kHz at <0.03% THD; 425 watts into 4 ohms, 20 Hz to 20 kHz at <0.05% THD; 700 watts into 2 ohms, 1 kHz at <1% THD; 500 watts at 70 or 100 volts, 50 Hz to 16 kHz at <0.5% THD, and 300 watts at 25 volts, 50 Hz to 16 kHz at <0.5% THD.
Frequency response (with filters not engaged) at 3 dB below rated power shall be 20 Hz to 20 kHz ±0.2 dB. The maximum voltage gain at the low-impedance outputs shall be 44.x, equivalent to 33 dB, and the 8-ohm input sensitivity shall be 1.07 Vrms (+2.8 dBu). The unweighted signal to noise ratio over the range of 20 Hz to 20 kHz shall exceed 100 dB, referenced to full output. IHF damping factor shall exceed 200 with an 8-ohm load.
The amplifier chassis shall occupy three rack spaces and have provisions for securing the rear corners. Depth from mounting surface to tips of rear supports shall be 15.9" (40.4 cm).
The amplifier's weight shall not exceed 49 lb. (22.3 kg). The amplifier shall be the QSC Audio Products ISA 500Ti.
TOP
ISA 750
ARCHITECT'S AND ENGINEER'S SPECIFICATIONS
The amplifier shall contain all solid-state circuitry, using complementary silicon output devices. The amplifier shall operate from 50-60 Hz AC power. The amplifier shall draw 760 VA or less when driven with random program material at 1/8 rated power into four-ohm loads. The amplifier shall be equipped with a 320-C19 16A IEC mains connector and a removable power cord. Units configured for 120V use shall have a 15A circuit breaker on the rear panel and operate safely from a 15A 120V AC outlet, and their power cords shall have a standard NEMA AC plug. Units configured for 230V use shall have an 8A circuit breaker on the rear panel and shall have a power cord with a standard Schuko AC plug. The amplifier shall comply with FCC part 15 Class B requirements.
The amplifier shall employ forced-air cooling with a temperature-controlled fan, variable in speed from zero to full for minimum acoustic noise. Air flow shall be from rear to front to avoid temperature rise inside the rack. Rack mounting shall be possible without clearance between amplifiers for ventilation. The amplifier shall be capable of continuous operation at 1/3 power into four-ohm loads, in ambient temperatures up to 104°F (40°C).
The amplifier shall contain two independent amplifier channels powered by a conventional power supply with a toroidal transformer. All amplifier protection systems shall be synchronized and self-resetting upon removal of fault. Each channel shall have circuitry to protect against short circuits or mismatched loads. Each channel shall independently monitor heat sink temperature to control the fan speed and if necessary, mute the signal to prevent excessive temperature. Both channels shall mute for several seconds after turn-on, and within 1/4 second after turn-off or loss of AC power.
Each channel's output section shall be AC coupled to protect the load against DC faults. Each channel shall have an independent and defeatable clip limiter and 12 dB per octave high-pass filter. The corner frequency of the filter shall be selectable between 30 and 70 Hz. Each channel's output section shall feature a two-tier Class H high-efficiency circuit.
The front panel shall contain these features: an AC power switch; a green LED status indicator for power; independent LED channel output indicators for signal present or -30 dB (green), and clip (red). The gain controls shall be located on the rear panel and have 11 detents. They shall be labeled in dB of attenuation, from 0 to infinity. From 0 to 14 dB, the attenuation steps shall be 2 dB per detent. The labeled attenuation settings shall be 0, 4, 10, 18, 25, and ∞ dB. The output connector for both channels shall be a barrier strip located on the rear panel, with screw terminals and a safety shroud. The terminals shall be arranged to facilitate bridged mono connection.
The inputs shall be located on the rear panel, consisting of a 3-pin detachable terminal block and a 3-pin XLR connector for each channel. The XLR input shall be wired with pin 2 high. Inputs shall be electronically balanced, with a minimum impedance of 20 kilohms balanced and 10 kilohms unbalanced, and a common mode rejection of at least 50 dB from 20 Hz to 20 kHz.
A High Density 15-pin DataPort connector shall be provided for carrying both audio and amplifier operational status signals to and from a QSControl network. The DataPort shall also accommodate plug-in crossover filters and other such accessories. A set of DIP switches on the rear panel shall be provided for: setting bridged mono and parallel-input operation; selecting clip limiters; and selecting high-pass filters and setting their frequencies.
Each channel shall be capable of meeting the following performance criteria with both channels driven: Sine-wave output power of 450 watts into 8 ohms, 20 Hz to 20 kHz at <0.03% THD; 650 watts into 4 ohms, 20 Hz to 20 kHz at <0.05% THD; and 1200 watts into 2 ohms, 1 kHz at <1% THD.
Frequency response (with filters not engaged) at 3 dB below rated power shall be 20 Hz to 20 kHz ±0.2 dB. The maximum voltage gain shall be 56.2x, equivalent to 35 dB, and the 8-ohm input sensitivity shall be 1.07 Vrms (+2.8 dBu). The unweighted signal to noise ratio over the range of 20 Hz to 20 kHz shall exceed 100 dB, referenced to full output. IHF damping factor shall exceed 200 with an 8-ohm load.
The amplifier chassis shall occupy three rack spaces and have provisions for securing the rear corners. Depth from mounting surface to tips of rear supports shall be 15.9" (40.4 cm).
The amplifier's weight shall not exceed 47 lb. (21.3 kg). The amplifier shall be the QSC Audio Products ISA 750.
TOP
ISA 800Ti
ARCHITECT'S AND ENGINEER'S SPECIFICATIONS
The amplifier shall contain all solid-state circuitry, using complementary silicon output devices. The amplifier shall operate from 50-60 Hz AC power. The amplifier shall draw 760 VA or less when driven with random program material at 1/8 rated power into four-ohm loads. The amplifier shall be equipped with a 320-C19 16A IEC mains connector and a removable power cord. Units configured for 120V use shall have a 15A circuit breaker on the rear panel and operate safely from a 15A 120V AC outlet, and their power cords shall have a standard NEMA AC plug. Units configured for 230V use shall have an 8A circuit breaker on the rear panel and shall have a power cord with a standard Schuko AC plug. The amplifier shall comply with FCC part 15 Class B requirements.
The amplifier shall employ forced-air cooling with a temperature-controlled fan, variable in speed from zero to full for minimum acoustic noise. Air flow shall be from rear to front to avoid temperature rise inside the rack. Rack mounting shall be possible without clearance between amplifiers for ventilation. The amplifier shall be capable of continuous operation at 1/3 power into four-ohm loads, in ambient temperatures up to 104°F (40°C).
The amplifier shall contain two independent amplifier channels powered by a conventional power supply with a toroidal transformer. All amplifier protection systems shall be synchronized and self-resetting upon removal of fault. Each channel shall have circuitry to protect against short circuits or mismatched loads. Each channel shall independently monitor heat sink temperature to control the fan speed and if necessary, mute the signal to prevent excessive temperature. Both channels shall mute for several seconds after turn-on, and within 1/4 second after turn-off or loss of AC power.
Each channel's output section shall be AC coupled to protect the load against DC faults. Each channel shall have an independent and defeatable clip limiter and a 12 dB per octave high-pass filter. The corner frequency of the filter shall be selectable between 50 and 75 Hz. Each channel's output section shall feature a two-tier Class H high-efficiency circuit.
The front panel shall contain these features: an AC power switch; a green LED status indicator for power; independent LED channel output indicators for signal present or -30 dB (green), and clip (red). The gain controls shall be located on the rear panel and have 11 detents. They shall be labeled in dB of attenuation, from 0 to infinity. From 0 to 14 dB, the attenuation steps shall be 2 dB per detent. The labeled attenuation settings shall be 0, 4, 10, 18, 25, and ∞ dB. The amplifier shall be designed to drive load impedances as low as 2 ohms per channel, and each output shall have an internal toroidal transformer with taps at 25, 70, and 100 volts for driving distributed lines. The output connectors for both channels shall be barrier strips located on the rear panel, with screw terminals and a safety shroud. There shall be terminals for both low-impedance and 25-, 70-, and 100-volt operation.
The inputs shall be located on the rear panel, consisting of a 3-pin detachable terminal block and a 3-pin XLR connector for each channel. The XLR input shall be wired with pin 2 high. Inputs shall be electronically balanced, with a minimum impedance of 20 kilohms balanced and 10 kilohms unbalanced, and a common mode rejection of at least 50 dB from 20 Hz to 20 kHz. A High Density 15-pin DataPort connector shall be provided for carrying both audio and amplifier operational status signals to and from a QSControl network. The DataPort shall also accommodate plug-in crossover filters and other such accessories. A set of DIP switches on the rear panel shall be provided for: setting bridged mono and parallel-input operation; selecting clip limiters; and selecting high-pass filters and setting their frequencies.
Each channel shall be capable of meeting the following performance criteria with both channels driven: Sine-wave output power of 450 watts into 8 ohms, 20 Hz to 20 kHz at <0.03% THD; 650 watts into 4 ohms, 20 Hz to 20 kHz at <0.05% THD; 1200 watts into 2 ohms, 1 kHz at <1% THD; 800 watts at 70 or 100 volts, 50 Hz to 16 kHz at <0.5% THD, and 500 watts at 25 volts, 50 Hz to 16 kHz at <0.5% THD.
Frequency response (with filters not engaged) at 3 dB below rated power shall be 20 Hz to 20 kHz ±0.2 dB. The maximum voltage gain at the low-impedance outputs shall be 56.2x, equivalent to 35 dB, and the 8-ohm input sensitivity shall be 1.07 Vrms (+2.8 dBu). The unweighted signal to noise ratio over the range of 20 Hz to 20 kHz shall exceed 100 dB, referenced to full output. IHF damping factor shall exceed 200 with an 8-ohm load.
The amplifier chassis shall occupy three rack spaces and have provisions for securing the rear corners. Depth from mounting surface to tips of rear supports shall be 15.9" (40.4 cm).
The amplifier's weight shall not exceed 57 lb. (26 kg). The amplifier shall be the QSC Audio Products ISA 800Ti.
TOP
ISA 1350
ARCHITECT'S AND ENGINEER'S SPECIFICATIONS
The amplifier shall contain all solid-state circuitry, using complementary silicon output devices. The amplifier shall operate from 50-60 Hz AC power. The amplifier shall draw 1200 VA or less when driven with random program material at 1/8 rated power into four-ohm loads. The amplifier shall be equipped with a 320-C19 16A IEC mains connector and a removable power cord. Units configured for 120V use shall have two 15A circuit breakers on the rear panel and operate safely from a 15A 120V AC outlet, and their power cords shall have a standard NEMA AC plug. Units configured for 230V use shall have two 8A circuit breakers on the rear panel and shall have a power cord with a standard Schuko AC plug. The amplifier shall comply with FCC part 15 Class B requirements.
The amplifier shall employ forced-air cooling with a temperature-controlled fan, variable in speed from zero to full for minimum acoustic noise. Air flow shall be from rear to front to avoid temperature rise inside the rack. Rack mounting shall be possible without clearance between amplifiers for ventilation. The amplifier shall be capable of continuous operation at 1/3 power into four-ohm loads, in ambient temperatures up to 104°F (40°C).
The amplifier shall contain two independent amplifier channels powered by a conventional power supply with a toroidal transformer. All amplifier protection systems shall be synchronized and self-resetting upon removal of fault. Each channel shall have circuitry to protect against short circuits or mismatched loads. Each channel shall independently monitor heat sink temperature to control the fan speed and if necessary, mute the signal to prevent excessive temperature. Both channels shall mute for several seconds after turn-on, and within 1/4 second after turn-off or loss of AC power.
Each channel's output section shall be AC coupled to protect the load against DC faults. Each channel shall have an independent and defeatable clip limiter and 12 dB per octave high-pass filter. The corner frequency of the filter shall be selectable between 30 and 70 Hz. Each channel's output section shall feature a three-tier Class H high-efficiency circuit.
The front panel shall contain these features: an AC power switch; a green LED status indicator for power; independent LED channel output indicators for signal present or -30 dB (green), and clip (red). The gain controls shall be located on the rear panel and have 11 detents. They shall be labeled in dB of attenuation, from 0 to infinity. From 0 to 14 dB, the attenuation steps shall be 2 dB per detent. The labeled attenuation settings shall be 0, 4, 10, 18, 25, and ∞ dB.
The output connector for both channels shall be a barrier strip located on the rear panel, with screw terminals and a safety shroud. The terminals shall be arranged to facilitate bridged mono connection.
The inputs shall be located on the rear panel, consisting of a 3-pin detachable terminal block and a 3-pin XLR connector for each channel. The XLR input shall be wired with pin 2 high. Inputs shall be electronically balanced, with a minimum impedance of 20 kilohms balanced and 10 kilohms unbalanced, and a common mode rejection of at least 50 dB from 20 Hz to 20 kHz.
A High Density 15-pin DataPort connector shall be provided for carrying both audio and amplifier operational status signals to and from a QSControl network. The DataPort shall also accommodate plug-in crossover filters and other such accessories. A set of DIP switches on the rear panel shall be provided for: setting bridged mono and parallel-input operation; selecting clip limiters; and selecting high-pass filters and setting their frequencies.
Each channel shall be capable of meeting the following performance criteria with both channels driven: Sine-wave output power of 800 watts into 8 ohms, 20 Hz to 20 kHz at <0.03% THD; 1300 watts into 4 ohms, 20 Hz to 20 kHz at <0.05% THD; and 2000 watts into 2 ohms, 1 kHz at <1% THD.
Frequency response (with filters not engaged) at 3 dB below rated power shall be 20 Hz to 20 kHz ±0.2 dB. The maximum voltage gain shall be 64x, equivalent to 36 dB, and the 8-ohm input sensitivity shall be 1.24 Vrms (+4.1 dBu). The unweighted signal to noise ratio over the range of 20 Hz to 20 kHz shall exceed 100 dB, referenced to full output. IHF damping factor shall exceed 200 with an 8-ohm load.
The amplifier chassis shall occupy three rack spaces and have provisions for securing the rear corners. Depth from mounting surface to tips of rear supports shall be 15.9" (40.4 cm).
The amplifier's weight shall not exceed 68 lb. (30.8 kg). The amplifier shall be the QSC Audio Products ISA 1350.
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ARCHITECT'S AND ENGINEER'S SPECIFICATIONS
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