The GXD 4 from QSC is a power amplifier designed for professional PA systems utilising speakers with 4 and 8 ohm loads and a maximum output of 1600W. The GXD 4 employs a class D output stage with a universal power supply for high performance and efficiency, while keeping the unit lightweight at 11.3 lbs. The integrated DSP section includes High and Low-Pass filters (24dB LR), 4-band parametric equaliser, signal alignment delay, and RMS/Peak speaker protection limiting.
The parallel XLR and 1/4" TRS input connectors offer broad compatibility with convenient loop-through capabilities, while the professional binding posts and NL4 connector provide mono and bi-amped speaker connections. In addition to the limiting offered on inputs and outputs, the GXD employs smart speaker protection by providing settings for the loudspeaker's continuous output and impedance (4 ohm or 8 ohm). The GXD 4 ships with a standard IEC power cord.
Features
- High peak output power with up to 1600 W
- Power levels matched to the most popular loudspeakers and optimised for maximum real-world headroom into 4 - ohm and 8-ohm speaker systems
- Class-D output stage with a universal power supply for high performance and efficiency
- Extensive built-in loudspeaker processing, includes high & low-pass filters, 4-band PEQ, limiting, and delay
- Large LCD display simplifies amplifier setup and indicates amp status
- Inputs: Parallel XLR and 1/4” TRS connectors for compatibility with any source while providing convenient loop-through capability
- Precision rotary encoders for gain and DSP parameter control
- Outputs: Professional binding post and NL4 connectors (compatible with NL2) provide for mono and bi-amp speaker connections
- Digital Limiting automatically protects the amplifier from damage due to temperature rise or overdrive
- Adjustable speaker protection to match your loudspeaker’s power and impedance
- Front panel LEDs indicate signal presence, input overload, and amplifier clipping
Specifications
| Watts Per Channel | 8 Ohm Dynamic (Both Channels Driven): 600 W 4 Ohm Dynamic (Both Channels Driven): 800 W 8 Ohm Continuous (Both Channels Driven): 400 W 4 Ohm Continuous (Both Channels Driven): 600 W |
| Total Harmonic Distortion (THD) | Distortion: < 1% (typical), 1 kHz at full rated power |
| Signal to Noise Ratio | Signal to Noise: 100 dB, (A-weighted, 20 Hz to 20 kHz) |
| Input Sensitivity | 1.2 Vrms 3.9 Vrms |
| Voltage Gain | 33.5 dB |
| Output Circuit | Class D |
| Power Requirements | Power Requirements: 1/8 power at 4 ohms 100 VAC: 3.4 A 120 VAC: 2.9 A 230 VAC: 1.6 A |
| Frequency Response | 20 Hz to 20 kHz (+0.7 dB, -0.8 dB) |
| Headroom | Dynamic Headroom: 1.25 dB (4 ohms) |
| Damping Factor | 100 |
| Input Impedance | 20 kOhms (balanced) 10 kOhms (unbalanced) |
| Maximum Input Level | +23.5 dBu |
| Input Connectors | 3-pin XLR/F 1/4" TRS, balanced |
| Output Connectors | NL4 (Channel 1 - 1+/-, Channel 2 - 2+/-), binding posts |
| Amplifier Protection | Short circuit Open circuit Thermal RF protection Load protected against DC faults |
| Front Panel Controls and Indicators | 2 x rotary encoders 3 x operational buttons (HOME, ENTER, EXIT) 2 x green signal LEDs, indicate signal presence 2 x red A/D clip LEDs, indicate input over-drive and/or amplifier current clipping Blue power LED ring, AC on 256 x 128 Pixel LCD: 2.1 x 1.0" / 5.4 x 2.5 cm |
| Digital Signal Processing (DSP) | High Pass Filter: 4th order LR, adjustable frequency 20 Hz to 4 kHz Low Pass Filter: 4th order LR, adjustable frequency 60 Hz to 4 kHz 4-Band PEQ: Variable frequency, gain, and bandwidth Peak Limiter: Power, aggressiveness, and impedance selection Delay: 50 ms maximum |
| Approvals | UL, COE, RoHS/WEEE compliant |
| Dimensions (H x W x D) | 3.5 x 19.0 x 10.2" / 8.9 x 48.3 x 25.9 cm |
| Weight | 11.3 lb / 5.1 kg |
