ALPHA A800.4D - Receiver Hifonics - Free user manual and instructions
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| Product Type | 4-Channel Car Audio Amplifier |
| Model | ALPHA A800.4D |
| Brand | Hifonics |
| Power Output (RMS) | 4 x 200W @ 2 ohms, 4 x 100W @ 4 ohms |
| Power Output (Bridged) | 2 x 400W @ 4 ohms |
| Frequency Response | 20 Hz - 20 kHz |
| Total Harmonic Distortion (THD) | < 0.05% |
| Signal-to-Noise Ratio | > 100 dB |
| Input Sensitivity | 0.2V - 6V |
| Damping Factor | > 200 |
| Dimensions (W x D x H) | 11.0 x 7.5 x 2.0 inches |
| Weight | 4.2 lbs |
| Power Supply Voltage | 12V DC (11-15V) |
| Fuse Rating | 40A external (x2 recommended) |
| Protection Features | Thermal, overcurrent, short circuit, under-voltage |
| Input Connectors | RCA (4 pairs), speaker level inputs |
| Output Connectors | 4 pairs of binding posts (for 8 AWG) |
| Channel Configuration | 4-channel (can be bridged to 2-channel) |
| Built-in Crossover | Variable LP/HP/Full range (12 dB/octave) |
| Bass Boost | 0-18 dB @ 45 Hz |
| Remote Turn-On | 12V trigger wire |
| Finishing | Metal heatsink with black brushed aluminum |
| Maintenance | Keep vents clear; clean with dry cloth; avoid moisture |
| Safety | Install fuse near battery; disconnect before servicing |
| Spare Parts | Contact Hifonics for replacement fuses, screws, or knobs |
Frequently Asked Questions - ALPHA A800.4D Hifonics
How many channels does the ALPHA A800.4D have?
It is a 4-channel amplifier, but can be bridged to 2 channels for more power.
What is the RMS power output per channel?
100W RMS per channel at 4 ohms, and 200W RMS per channel at 2 ohms.
Can I bridge channels on the ALPHA A800.4D?
Yes, bridging channels 1&2 and 3&4 gives 400W RMS per channel at 4 ohms.
What size fuse should I use?
Use an external 40A fuse on the power wire near the battery. For high-power setups, two 40A fuses are recommended.
Does the amplifier have a built-in crossover?
Yes, it features a variable low-pass/high-pass/full crossover (12 dB/octave) to match your speakers or subwoofer.
What is the minimum impedance for stable operation?
In stereo mode, 2 ohms minimum per channel. In bridged mode, 4 ohms minimum.
How do I connect the remote turn-on wire?
Connect the REM terminal to a 12V switched source (e.g., stereo remote output or ACC wire) to turn the amp on/off with the ignition.
What protection circuits does the amplifier have?
It includes thermal, overcurrent, short circuit, and under-voltage protection. The LED will indicate fault conditions.
Can I use speaker-level inputs instead of RCA?
Yes, the amplifier has high-level (speaker) inputs if your head unit lacks RCA outputs.
How do I adjust the gain and crossover?
Use a small flathead screwdriver to turn the gain (input sensitivity) and crossover frequency dials. Start with gain low to avoid distortion.
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USER MANUAL ALPHA A800.4D Hifonics
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Product information
Brand : Hifonics
Model : ALPHA A800.4D
Category : Receiver