About the Sound Ordnance™ M-4075
Win the battle for great sound in your ride. Sound Ordnance amplifiers feature tough construction, rugged looks, and a 3-year warranty, so you can enjoy the full power of your music for the long haul. Even better, you can add Sound Ordnance to your arsenal at a surprisingly affordable price.
The Sound Ordnance M-4075 4-channel amplifier deploys 75 watts RMS to each channel, giving your music plenty of firepower. You can also bridge the amp to 2-channel mode to mobilize a pair of subs with 240 watts RMS each, or send 240 watts to a sub while the front channels run your full-range speakers. An adjustable high-pass filter makes sure your full-range speakers operate within their optimum range and give you the best tone possible. If you're driving a sub, the low-pass filter and selectable bass boost allow you to control your bass barrage at will.
The M-4075 amplifier uses sophisticated power supply and output technologies to ensure clean amplification from its inputs all the way to your speakers. Special circuits protect the amp against overheating and short circuits, while a turn-on delay virtually eliminates that annoying thump when you turn your system on.
Product highlights:
- 4-channel car amplifier
- 75 watts RMS x 4 at 4 ohms (120 watts RMS x 4 at 2 ohms)
- 240 watts RMS x 2 bridged at 4 ohms (4-ohm stable bridged)
- variable high-pass filter (80-2K Hz, 12 dB/octave)
- variable low-pass filter (50-250 Hz, 12 dB/octave)
- selectable bass boost (0, 6, and 12 dB at 45 Hz)
- PWM (pulse width modulation) power supply with MOSFET output
- preamp inputs and outputs
- fuse rating: 30A x 2
- 8-gauge power and ground leads recommended — wiring and hardware not included with amplifier
- 15-3/4"W x 2-1/8"H x 9-3/4"D
- warranty: 3 years
- Our 60-day money-back guarantee
- MFR # M4075
What's in the box:
Sound Ordnance M-4075 owner's manual
- 4-Channel amplifier with two 30A ATC blade fuses inserted
- Spare 30A ATC blade fuse
- 4 Self-tapping screws (5/8" length)
- 4 Split lock washers
- 4 Flat washers
- Owner's Manual
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More details on the Sound Ordnance™ M-4075
Features & specs
| Performance | ||
|---|---|---|
| RMS Power Output (Watts x Channels) |
75 x 4 | |
| Peak Power Output (Watts x Channels) | 125 x 4 | |
| Power at 2 Ohms (Watts x Channels) | 120 x 4 | |
| Bridged Power (Watts x Channels) | 240 x 2 | |
| Minimum Impedance Bridged | 4 | |
| Minimum Impedance Unbridged | 2 | |
| Minimum Impedance | 2 | |
| Best Frequency Response | 12-25k Hz | |
| THD at Rated RMS Power | 1% | |
| Signal to Noise Ratio | 88 dB | |
| Input Voltage | 14.4v | |
| Features | ||
| Amplifier Class | AB | |
| Low-Pass Crossover Frequency | 50-250 Hz | |
| Low-Pass Slope (dB/octave) | 12 dB/oct | |
| High-Pass Crossover Frequency | 80-2k Hz | |
| High-Pass Slope (dB/octave) | 12 dB/oct | |
| Bass Boost | 0, 6, 12 dB | |
| Bass Boost Frequency | 45 Hz | |
| Fan Cooled | No | |
| Fuse Rating | 60 | |
| Speaker Level Inputs | --- | |
| Preamp Outputs | 1 pair | |
| Width (inches) | 15-3/4 | |
| Height (inches) | 2-1/8 | |
| Depth (inches) | 9-3/4 | |
| Parts Warranty | 3 Years | |
| Labor Warranty | 3 Years | |
Product Research
Features
Power Ratings: The Sound Ordnance M-4075 is a 4-channel Class AB amplifier with an RMS power rating of 75 watts per channel into 4 ohms, and 120 watts per channel into 2 ohms. The amp can also be bridged into a 4-ohm load for a power rating of 240 watts (x 2). Power ratings are measured with an input power of 14.4 volts.
Crossovers: The M-4075 is equipped with both high-pass and low-pass crossovers. The front channels (channels 1 and 2) and the rear channels (channels 3 and 4) have separate crossovers. You can set the low-pass cutoff frequency between 50Hz and 250Hz, and the high-pass cutoff frequency between 80Hz and 2 kHz. Separate switches let you select low-pass, high-pass, or full range operation for the rear channels, and high-pass or full range for the front channels. The crossovers have a 12dB per octave slope.
Bass Boost: The amplifier has a bass boost switch, labeled Super Bass, to give small subwoofers more volume in the low frequencies. You can select the amount of boost with the 3-way switch: 0dB, 6dB, or 12dB. The Super Bass feature is available for the rear channels only.
LED Indicators: The M-4075 features two LED indicators: a green LED that illuminates when the amp is powered on, and a red LED that illuminates when the amplifier is in protect mode due to overheating or a short circuit in the speaker wire.
Connections
Removable End Caps: The end caps on the M-4075 are removable with a 3mm Allen wrench (not supplied) to make it easier to attach the power and speaker wires.
Power Connections: The power and ground connections are set screw terminals that will accommodate up to 8-gauge wire. (An 8-gauge amplifier wiring kit is recommended.) The remote turn-on terminal is a set screw terminal that will also accept up to 8-gauge wire. A Phillips-head screwdriver (not supplied) is required to tighten/loosen the terminals.
Speaker Connections: The speaker connections are set screw terminals that will accommodate up to 8-gauge wire. A Phillips-head screwdriver (not supplied) is required to tighten/loosen the terminals.
RCA Inputs and Outputs: The amplifier features two pairs of stereo RCA inputs for connecting your head unit--one pair for the front channels and one pair for the rear channels. If your head unit only has one pair of preamp outputs, you can feed all four amplifier channels by connecting optional Y-adapters. (You will lose front-to-back fader capability if you connect the amplifier using Y-adapters.) There is also a pair of stereo RCA outputs for feeding the preamp signal to another amplifier, if needed.
Fuses: The M-4075 features two 30-amp ATC blade fuses.
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This Amplifier has truly exceeded my expectaions! It sounds better than my Dads $400.00 Amp from Alipine....Thanks Sound Ordanance for building a superior Amp for the money!
DavidG from Loveland, CO