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SPECIFICATIONS FOR THE 9444B and 9444B/SA POWER AMPLIFIERS

Conditions:
1. 0 dBu = 0.775 volts rms.
2. Dual mode ratings are for each channel.
3. Both channels operating at rated output power unless noted.
4. 120 volt ac line input voltage maintained for all tests unless noted.

Continuous Rated Output Power:
(20 Hz - 20 kHz at less than 0.1% THD) Dual mode, 4 Q: 300 watts/ch
Bridge mode, 8 Q: 600 watts
Dual mode, 8 S2: 200 watts/ch
Bridge mode, 16 9: 400 watts

Continuous Rated Output Power to Subwoofer: (20 Hz - 1 kHz at less than 0.1% THD) Dual mode, 4 Q: 375 watts/ch
Bridge mode, 8 Q: 750 watts
Dual mode, 8 Q: 225 watts/ch
Bridge mode, 16 Q: 450 watts

Maximum Midband Output Power:
(Ref. 1 kHz, 1% THD, @120 volts ac line voltage) Dual mode, 4 Q: >400 watts/ch
Bridge mode, 8 0: >800 watts
Dual mode, 8 Q: >250 watts/ch
Bridge mode, 16 Q: >500 watts

(Re(. 1 kHz, 1% THD, @108 volts ac (10% sag)) Dual mode, 4 92: >325 watts/channel.
Bridge mode, 8 Q: >650 watts.
Dual mode, 8 Q: >200 watts/channel.
Bridge mode, 16 Q: >400 watts.

(Ref. 1 kHz, 1% THD, @100 volts ac (17% sag)) Dual mode, 4 Q: >230 watts/channel.
Bridge mode, 8 Q: >460 watts.
Dual mode, 8 Q: >175 watts/channel.
Bridge mode, 16 Q: >350 watts.

Headroom (Before clip): >_1 dB. (Ref. 1 kHz, 1% THD, any mode)

Frequency Response: 10 Hz - 90 kHz. (Ref. 1 kHz, 1 watt output, +0/-3 dB)

Power Bandwidth: 20 Hz - 20 kHz.
(Ref. 1 kHz, +0/-1 dBr where 0 dBr = rated output power in any mode)

Voltage Gain:
(Ref. 1 kHz)
Dual mode, 4 Q or 8 Q: 33 dB.
Bridge mode, 8 or 16 Q: 39 dB.

Input Sensitivity for Rated Output Power: (Ref. 1 kHz, ±0.15 dB)
Dual mode, 4 92: +0.1 dBu (0.78 V rms). Bridge mode, 8 Q: +0.1 dBu (0.78 V rms). Dual mode, 8 Q: +1.2 dBu (0.89 V rms). Bridge mode, 16 92: +1.2 dBu (0.89 V rms).

Maximum Input Level: +20 dBu (7.75 V rms). (Ref. 1 kHz)

Input Impedance:
(Ref. 1 kHz)
Balanced: 15 kQ.
Unbalanced: 15 kS2.

Polarity: Positive-going signal applied to pin 2 of XLR or (+) of barrier strip will produce a positive-going signal at (+) output terminal.

Phase Response: (Any mode)
20 Hz: <+25°.
20 kHz: >-1 S°.

THD: <0.1% (Typically <0.01%). (Any mode, 30 kHz measurement bandwidth)

IMD (SMPTE 4:1): <0.05% (Typically <0.01%). (Any mode)

TIM (DIM 100): <0.05%. (Any mode)

Rise Time: <6 µsec. (Any mode, 10% to 90%)

Slew Rate:
Dual mode, 4 or 8 Q: >30 V/µsec. Bridge mode, 8 or 16 Q: >60 V/psec.

Damping Factor:
(Dual mode, 8 Q)
20 Hz - 1 kHz: >200
20 kHz: >75

Crosstalk: <75 dBr.
(Ref. 1 kHz, 0 dBr = rated output power into 8 ohms, single channel operating)

Noise: >100dB below rated output power. (A-weighting filter, 8 4 dual mode, 50/60 Hz ac line frequency.)

Amplifier Protection: Shorted output. terminals, Over-temperature, RF interference.

Load Protection: Startup/shutdown transients, DC faults, Subsonic signals.
Cooling:
Heat_sink: Thermally equalized 3/16 inch aluminum black anodized heatsink.

Fan: Thermostatically controlled dual speed fan. Approximately 50 CFM at low speed and 100 CFM at high speed. Ball bearing fan has minimum life rating of 50,000 hours at 25°C ambient temperature.