PRXA300.4 - Receiver Memphis Audio - Free user manual and instructions
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| Product Type | 4-Channel Marine Audio Amplifier |
| Model | PRXA300.4 |
| Brand | Memphis Audio |
| RMS Power (4 ohms) | 75 watts x 4 channels |
| RMS Power (2 ohms) | 150 watts x 4 channels |
| RMS Power (Bridged 4 ohms) | 300 watts x 2 channels |
| Peak Power | 300 watts x 4 channels (max) |
| Frequency Response | 20 Hz – 20 kHz ±1 dB |
| Total Harmonic Distortion | <0.05% (RMS power) |
| Signal-to-Noise Ratio | >100 dB |
| Input Impedance | 20 kΩ (RCA inputs) |
| Input Sensitivity Range | 200 mV – 4 V |
| High-Level Inputs | Yes (with signal sensing) |
| Crossover Type | Variable high-pass/low-pass (50 – 500 Hz) |
| Bass Boost | 0 – 12 dB at 45 Hz |
| Remote Level Control | Optional (sold separately) |
| Amplifier Class | Class A/B |
| Power Supply | 12V DC (10 – 15V) |
| Current Draw (RMS) | 40 A (typical) |
| Fuse Rating | 40 A (AGU-type) |
| Dimensions (W x H x L) | 2.36" x 1.93" x 11.81" (60 x 49 x 300 mm) |
| Weight | 3.3 lbs (1.5 kg) |
| Material | Aluminum heat sink, marine-grade coating |
| Recommended Speaker Impedance | 2 – 8 ohms per channel |
| Installation | Professional installation recommended; disconnect battery before wiring |
| Cleaning | Wipe with a soft, dry cloth; avoid solvents |
| Safety | Designed for 12V negative ground systems only; do not expose to moisture |
| Spare Parts / Repairability | Contact authorized Memphis Audio service centers |
| General Information | Marine-certified; weather-resistant; CEA-2006 compliant power ratings |
Frequently Asked Questions - PRXA300.4 Memphis Audio
What is the RMS power output of the Memphis Audio PRXA300.4?
The PRXA300.4 delivers 75 watts RMS per channel at 4 ohms, 150 watts RMS per channel at 2 ohms, and 300 watts RMS in bridged mode (2 channels) at 4 ohms.
Can I use this amplifier with a factory stereo?
Yes, the PRXA300.4 accepts high-level speaker inputs directly, so it can be connected to a factory head unit without an additional line output converter.
What is the recommended speaker impedance for this amplifier?
The amplifier is stable at 2 to 8 ohms per channel in stereo mode. For bridged mode, use a 4 ohm minimum load.
How do I bridge channels on the PRXA300.4?
To bridge channels, connect the positive speaker wire to the positive terminal of the left channel and the negative wire to the negative terminal of the right channel (e.g., CH1+ and CH2- for a bridged output). Ensure the load is 4 ohms or higher.
Does the amplifier have a built-in crossover?
Yes, it includes a variable high-pass and low-pass crossover (50 – 500 Hz) and a bass boost (0 – 12 dB at 45 Hz) to fine-tune your system.
What type of fuse does the PRXA300.4 require?
It uses a single 40A AGU-type fuse (included). Always replace with the same rating.
Is this amplifier marine-certified?
Yes, the PRXA300.4 features a marine-grade coating and is designed to withstand moisture, making it suitable for boats and other outdoor installations.
What gauge power wire should I use?
For runs up to 15 feet, 8 AWG wire is recommended. For longer runs or higher current draw, use 4 AWG.
Can I use a remote level control with this amplifier?
Yes, an optional Memphis Audio remote level control can be connected to the remote port (sold separately) for easy gain adjustment.
How do I troubleshoot no power or protection mode?
Check the fuse, ground connection (clean and tight), remote turn-on voltage (12V+), and ensure the amplifier isn't overheating. If the protection light stays on, reduce the gain or speaker load.
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