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4 Channel Marine Amplifier
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Pioneer GM-ME400X4
Marine-grade Class-D digital amplifier by PioneerSpecial coating and protective covers for side panels and RCA connectorsVariable high-pass and low-pass filters for precise audio frequency tuningSpeaker input sensor enables easy connection of OEM devicesClass-D technology for premium sound and high volume levelsPower: 800 Watts RMS, 400 Watts max.
£299.99

source: Amazon
Kenwood KAC-M1814
Compact digital four-channel amplifier for car audio systemsClass D digital technologyMax. output power: 400 wattsFrequency response: 20 20,000 HzRCA / speaker-level inputVariable low& high-pass filtersCompact size: 145 x 45 x 99 mm
£129.99

Pyle PLMRA420 1000W 4 Channel Waterproof Marine Bridgeable Mosfet Amplifier B00068U9Y8
250 Watts x 4 Output - LED Protection Indicator - Dimensions: 10.9'' W x 2.7'' H x 12'' L 500 Watts x 2 Bridged Output (250W x 2 + 500W x 1) - Blue LED Level Display Dual Variable Hi/Lo Electronic Crossover Network - Tri-Mode Configurable Dual Variable Bass Boost - Variable Input Level (Gain) Control Power On LED Indicator - Thermal, Overload, Short Circuit Protection
£137.09
Shipping: £29.43
Amazon Marketplace - Amazon US

Fusion SG-DA41400
4-channel Class D amplifier with a power output of 1400 wattsDesigned for extreme marine conditions with protection against salt and moistureCapability to operate up to two speakers per channel at 2 ohmsCircuit boards treated with protective coating for additional environmental protectionRobust aluminum heat sink for optimal heat dissipationDimensions: Height 5.5 cm, Length 30.5 cm, Width 23.5 cm
£440.24
Shipping: Free
eBay - simplybrandsdirect

Hertz HCP5MD
5-channel Marine Class D digital amplifier with 1500 W RMSCompact extruded aluminum design for optimal heat dissipationHigh suppression of electromagnetic interference through symmetrical circuitryFully adjustable low-pass and high-pass filters with 12 dB and 24 dB slopesCorrosion protection with epoxy-coated PCB boardsDimensions: Weight 2.61 kg
£383.25
Shipping: Free
eBay - simplybrandsdirect

BOSS Audio Systems MGR350B Marine Boat Stereo Gauge Receiver – Bluetooth Head Unit, No CD DVD Player, Built-in 4 Channel Amplifier, Weatherproof, USB, USB Charging 5218755
Bluetooth Audio Streaming (Play and control music and apps like Spotify / Pandora wirelessly) Bluetooth - Play and control music through your smartphone or MP3 player as well as apps like Spotify / Pandora, wirelessly Weatherproof - The MGR350B has been outfitted with the latest weatherproofing techniques such as front panel UV coating, PC board with conformal coating. It has an IPX 6 rating for protection against splashing water Media Playback - Bluetooth, play music via the USB port or tune into the AM/FM radio stations for up to date music/news/sports and more. The MGR350B does not have a CD or DVD mechanism Inputs - The USB port gives you the option to have a vast library of audio files at your fingertips. The auxiliary input is compatible with audio output from smartphones and MP3 players. USB charging
£170.99
Shipping: Free
Amazon Marketplace - TradeINN

Pyle Waterproof Off-Road Speakers with Amplifier - 4 Inch 800W 2-Channel Marine Grade Waketower Speakers System Full Range Outdoor Audio Stereo Speaker for ATV, UTV, Quad, Jeep, Boat PLUTV42CH B084KNZZPX
AMPLIFY YOUR RIDE: Pyle’s 800W dual marine grade off-road speaker kit is what you need to listen to high-quality audio on your boat, ATV, UTV, quad, Jeep, other outdoor vehicles! Includes (2) 4” 2-way off-road speaker system along w/ marine amplifier 800-WATT POWER: The pair of Pro Audio PowerSport speakers feature an 800W high powered output. It has a frequency response of 20Hz-20kHz w/ 4-ohm impedance and is equipped w/ impressive bass response & integrated speaker wiring for quick connection 2-CHANNEL AUDIO: The kit includes a 2-CH marine audio amplifier w/ wired RCA/AUX audio input, pre-amp RCA out to any OEM/factory made universal mono block or full range amplifier, overload & power protection circuitry & anti-thump/soft turn-on/off TWO-WAY: The wake board speaker kit features a 20oz magnet structure that powers (2) 0. 5” neodymium dome tweeters, (2) 4” polypropylene cones w/ butyl rubber surround and 1” aluminum mid-woofer voice coil for a full range stereo sound reproduction UNIVERSAL MOUNTING: The weather-resistant speakers are protectively stored in a heavy-duty molded cabinet w/ butyl rubber surround. Designed to be mounted on a support bar, frame, roll-bar/cage. Includes RCA-to-AUX 3. 5mm & AUX (3. 5mm) audio cables
£142.01
Shipping: £28.76
Amazon Marketplace - Amazon US

Rockford Fosgate TM400X4ad
4-channel Class AD amplifier with 800 W total power4 x 100 watts RMS at 4 ohms or 2 x 200 watts RMS bridgedHigh/low pass adjustable from 50 to 250 HzBass boost up to 14 dB and treble boost up to 18 dBC.L.E.A.N. setup for high-level inputs with automatic activation75% efficiency with performance certificationDimensions: height 10.8 cm, length 21.1 cm, width 4.1 cm
£509.99
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