Quantum QL800.4 - Receiver ESX - Free user manual and instructions
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| Product Type | 4-Channel Car Audio Amplifier |
| Model | Quantum QL800.4 |
| Brand | ESX |
| Power Output (RMS) @ 4Ω | 4 x 80W |
| Power Output (RMS) @ 2Ω | 4 x 150W |
| Bridged Power (RMS) @ 4Ω | 2 x 300W |
| Frequency Response | 10 Hz – 30 kHz |
| Input Sensitivity | 0.2 V – 6 V |
| Signal-to-Noise Ratio | > 95 dB |
| Total Harmonic Distortion (THD) | < 0.05% |
| Dimensions (W x H x D) | 200 x 50 x 480 mm |
| Weight | 2.5 kg |
| Power Supply Voltage | 10 – 16 V DC |
| Input Type | RCA / High-Level (Speaker Input) |
| Crossover | Variable LPF/HPF 50 – 250 Hz |
| Protection Circuits | Thermal, Short Circuit, Overload |
| Construction | Aluminum heatsink, painted finish |
| Included Accessories | Mounting screws, remote control (optional) |
| Warranty | 2 years from date of purchase |
Frequently Asked Questions - Quantum QL800.4 ESX
How do I connect the Quantum QL800.4 amplifier to my car stereo?
Use high-quality RCA cables from your stereo's preamp outputs to the amplifier's RCA inputs. If your stereo lacks RCA outputs, use the high-level (speaker) input adapter included.
What is the recommended speaker impedance for this amplifier?
The amplifier is stable at 4Ω and 2Ω per channel. For bridged mode, use a minimum 4Ω load. Do not use 1Ω loads as it may cause damage.
How do I set the gain on the QL800.4?
Turn the gain to minimum, play a test tone at 1 kHz, and gradually increase the gain until you hear distortion, then turn back slightly. Use a multimeter to set voltage precisely.
What does the protection LED mean?
The protection LED indicates a fault such as short circuit, thermal overload, or low battery voltage. Check speaker wires and ensure adequate ventilation.
Can I bridge two channels for a subwoofer?
Yes, bridge channels 1&2 or 3&4 for a single subwoofer. Ensure the subwoofer impedance is 4Ω or higher. Total output will be 300W RMS.
What is the correct power supply connection?
Connect the B+ terminal to the battery positive via a fuse (recommended 40A), GND to a clean chassis ground, and REM to a remote turn-on wire from the stereo.
How do I adjust the crossover?
Use the HPF (high-pass) for full-range speakers and LPF (low-pass) for subwoofers. Set the frequency based on your speaker's capabilities, typically 80 Hz for subwoofers.
Why is the amplifier getting hot?
Check for proper ventilation, ensure impedance is not too low, and the gain is not set too high. The amplifier has thermal protection but should be cooled.
What size fuse should I use?
ESX recommends a 40A inline fuse on the power wire. Use a fuse holder close to the battery. Never use a higher amp rating.
Where can I find the full user manual?
The full manual is available for free download on notice-facile.com. Search for 'Quantum QL800.4 ESX' and get the PDF.
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