Acousti-Board
QSC CX108V & QSC CX168 Audio Power Amplifier
CX 8-Channel Professional Audio Power Amplifiers
Designed for permanently installed sound systems where rackspace is at a premium, QSC’s CX108V and CX168 provide unprecedented levels of channel density for multi-channel amplifiers. The QSC CX108V and QSC CX168 provide 100 watts per channel at 70 volts and 90 watts per channel at 8 ohms respectively. With both models, each pair of channels may be bridged to configure these amplifiers as 4, 5, 6, or 7 channel units. Like the entire CX Series, the 8 channel models features DataPorts for remote amplifier management or signal processing, incorporate QSC’s legendary PowerLight® technology, and deliver our unmatched reputation for quality and reliability.
Product Testing & Information
QSC’s PowerLight technology takes your audio to an entirely new level. Delivering tighter bass and clean, transparent highs, PowerLight also cuts waste heat, boosts reliability and eliminates unwanted noise and hum. PowerLight is a revolutionary switching power supply technology that provides ample current to the audio power circuitry by charging the supply rails over 200,000 times per second through an ultra-low noise impedance circuit. Unlike amplifiers that use conventional supplies, the QSC 8-channel amplifier’s audio signal is never starved prematurely and remains crisp and clean.
Product Features
- 100 Watts per Channel at 70 Volts (CX108V)
- 90 Watts per Channel at 8 Ohms and 130 Watts per Channel at 4 Ohms (CX168)
- Compact Size – Only Two Rack Spaces and 14″ Deep for Reduced Rack Space
- Channel Pairs Bridgeable for Maximum Flexibility
- Exclusive PowerLight Switch-Mode Power Supply Technology for High Performance and Compact Size
- Active Inrush Limiting Eliminates AC Inrush Current, Removing the Need for Expensive Power Sequencers
- Four HD15 DataPorts (One per Channel Pair) for QSControl Computer Control or QSC’s Signal Processing Accessories
- Custom Integrated Gain Control Security Cover for Tamper Proof Installations
- 1 dB Recessed Detented Gain Control for Fast and Accurate Settings
- Detachable Euro Style Input and Output Connectors
- DIP Switch Control for Clip Limiters, High-Pass Filters, Bridge Mono and Parallel Operation
- Selectable High-Pass Filters Protect Speakers and Prevent Speaker Transformer Saturation with Minimal Effect on Program Material (50 Hz or 75 Hz; CX108V) (33 Hz or 70 Hz; CX168)
- Comprehensive Front Panel Indicators Including Signal, Clip, Bridge Mono and Parallel-Input LEDs
- Fully Protected – Including DC, Infrasonic and Ultrasonic, Thermal Overload and Short Circuit Protection
- High-Performance Class AB+B Complementary Bipolar Output Circuitry
- Lightweight – Only 21 lbs (9.5 kg) for Easier Racking and Shipping
- 3 Year Warranty Plus Optional 3 Year Extended Service Contract
| CX168 | CX108V | |||
|---|---|---|---|---|
| Watts Per Channel | ||||
| 8Ω / 20 Hz-20 kHz / 0.05% THD | 8 × 90 | — | ||
| 4Ω / 20 Hz-20 kHz / 0.1% THD | 8 × 130 | — | ||
| 70V / 20 Hz-20 kHz / 0.2% THD | — | 8 × 100 | ||
| Stereo Mode (all channels driven) | Continuous average output power per channel | |||
| 8Ω / 20 Hz-20 kHz / 0.05% THD | 90 W | — | ||
| 4Ω / 20 Hz-20 kHz / 0.1% THD | 130 W | |||
| Midband Ratings | All Channels Driven | Single Channel | ||
| 8Ω / 1 kHz / 0.1% THD | 100 W | 120 W | — | |
| 4Ω / 1 kHz / 0.1% THD | 140 W | 180 W | — | |
| 70V / 20 Hz-20 kHz / 0.2% THD | — | 100 W | ||
| Bridge Mono Mode | Bridge mono mode operation | |||
| 16Ω / 20 Hz-20 kHz / 0.1% THD | 180 W | — | ||
| 8Ω / 20 Hz-20 kHz / 0.1% THD | 260 W | — | ||
| 140V / 20 Hz-20 kHz / 0.2% THD | — | 200 W | ||
| Signal to Noise (20 Hz-20 kHz) | -107 dB | -100 db | ||
| Input Sensitivity | 1.25 Vrms at 8Ω | 1.26 Vrms at 70V | ||
| Voltage Gain | 20× (26 dB) | 56× (35 dB) | ||
| Input Clipping | 6 Vrms (+18 dBu) | 6 Vrms (+18 dBu) | ||
| Output Circuitry | AB+B | AB+B | ||
| Frequency Response | 20 Hz-20 kHz, + 0.2 dB | 20 Hz-20 kHz, + 0.4dB | ||
| 8 Hz-50 kHz, + 0/-3 dB | 8 Hz-70 kHz, + 0/-3 dB | |||
| Damping Factor | >200 (5 kHz and below) | >500 (5 kHz and below) | ||
| Input Impedence | 6k ohms unbalanced, 22k ohms balanced | 6k ohms unbalanced, 22k ohms balanced | ||
| Distortion (SMPTE-IM) | < 0.02% | |||
| Distortion (typical) | ||||
| 20 Hz-20 kHz: 10 dB below rated power | < 0.1% THD | |||
| 1.0 kHz and below: full rated power | < 0.03% THD | |||
| Cooling | Variable-speed fan / rear-to-front air flow through tunnel heat sink | |||
| Connectors | ||||
| Input | 3-pin euro-style detachable terminal blocks (one per channel) | |||
| DataPort | HD-15 connector (Ch. 1+2, 3+4, 5+6, 7+8) | |||
| Output | two 8-pin euro-style detachable terminal blocks | |||
| Controls | ||||
| Front | AC switch, Ch. 1, 2, 3, 4, 5, 6, 7 & 8 gain knobs | |||
| Rear | DIP switches for Ch. 1-8, clip limiter on/off, LF filter freq select 33 or 70 Hz for CX168, LF filter freq select 50 or 75 Hz for CX108V, inputs parallel or stereo; bridge mono | |||
| Indicators | ||||
| Power-On | Green LED | |||
| Parallel Inputs | Orange LED (1 per channel pair) | |||
| Signal -35 dB | Green LED (1 per channel) | |||
| Bridged | Yellow LED (1 per channel) | |||
| Clip | Red LED (1 per channel) | |||
| Amplifier Protection | Full short circuit, open circuit, thermal, ultrasonic, and RF protection. Stable into reactive or mismatched loads | |||
| Load Protection | On/off muting, individual channel DC fault blocking | |||
| Dimensions (H×W×D) | 3.5″ (8.9 cm) 2 rack spaces × 19″ (48.3 cm) rack mounting × 14″ (35.6 cm) from front mount rails | |||
| Weight – Net/Shipping | 21 lbs (9.5 kg)/27 lbs (12.3 kg) | |||
| Power Requirements | 100, 120, 230 VAC, 50-60 Hz (configured at factory) | |||
| 120V Current Consumption (Multiply currents by 0.5 for 230V units) | ||||
| Idle | 0.6 A | 0.6 A | ||
| 1⁄8 power pink noise (typical of program material at maximum unclipped power) | 8Ω | 6.2 A | — | |
| 4Ω | 9.2 A | — | ||
| 70V | — | 6.3 A | ||
| 1⁄3 power pink noise (typical of program material with severe clipping) | 8Ω | 9.2 A | — | |
| 4Ω | 14.2 A | — | ||
| 70V | — | 9.4 A | ||
