Model 3800 - QSC III Series Technical & Service Manual

OUTPUT POWER (per channel)
Continuous Average Output Power both channels
driven:
8 ohms,
20 Hz-20 kHz 0.1% THD
1 kHz
4 ohms,
20 Hz-20 kHz 0.1% THD
1 kHz
2 ohms,
20 Hz-20 kHz 0.2% THD
1 kHz
Bridged Mono operation:
16 ohms,
20 Hz-20 kHz 0.1% THD
1 kHz
8 ohms,
20 Hz-20 kHz 0.1% THD
1 kHz
4 ohms,
20 Hz-20 kHz 0.2% THD
1 kHz
Distortion:
THD – 20 Hz-20 kHz at rated power shall be less than
0.1%. SMPTE-IMD less than 0.025% at rated power.
Frequency Response:
Damping Factor:
Dynamic Headroom:
Noise:
Sensitivity:
Input Impedance:
Controls:
Front – Flush detented gain control, recessed
AC switch and AC circuit breaker for each
channel.
Rear – Mono-bridging and accessory module
switches.
Indicators:
Bi-color LED indicating DC power –
OK/Protect mode, LED clip indicator, -30 dB
and –6 dB signal level indicators, flashing
over-temp indicators.
375 W
1% THD 440 W
600 W
1% THD 750 W
850 W
1% THD 1100 W
720 W
1% THD 880 W
1200 W
1% THD 1500 W
1700 W
1% THD 2200 W
20 Hz-10 kHz ± 0.1 dB
8 Hz-300 kHz +0/-3 dB
Greater than 200
2 dB at 4 Ω
-100 dB 20 Hz-20 kHz
1 V RMS for rated power (8 Ω)
20 kΩ balanced or 10 kΩ
unbalanced

Model 3800

Cooling:
Amplifier Protection:
Load Protection:
Output Circuit Type:
Output Devices (total):
Power Supply:
Power Requirements:
Dimensions:
Weight:
Passive cooling combined with high efficiency
output stage for 50% reduction in dissipated
heat. Unique circuit configuration provides
direct-metal mounting of output devices to
minimize short-term thermal excursions of
power transistors. Fan-assisted cooling
recommended for high duty cycles at 2 ohms.
Indefinite short circuit*, open circuit,
over-temp, ultrasonic and RF protection.
Stable into reactive and mismatched loads.
Inputs protected from overload.
* Output Averaging short circuit protection
(U.S. Pat. 4,321.554)
Individual channel output relays
provide DC Fault, 3 second delayed turn-on
(transient protection), and excessive low-
frequency protection. Instant turn-off, pop
suppression and power interrupt protect is also
provided..
Full complementary two-level high
efficiency.
40
A complete separate power supply for each
channel including AC switch/circuit breaker
and AC cord.
120, 220, or 240 Volts, 50 Hz-60 Hz,
13 A (each channel)
Faceplate 19" × 5.25"
Depth (behind mtg,
with rear support) 17.9"
Depth (chassis) 15.9"
Shipping (lbs.) 75
Net (lbs.) 83
8