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Pyle PLMRA400

400W 4-Channel Hydra Series Marine Amplifier

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Pyle PLMRA400

400W 4-Channel Hydra Series Marine Amplifier


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Universal Bluetooth Audio Receiver


NVX V-Series RCA Interconnect Cable

19 ft. of 4-Channel RCA cable with dual twisted-pair conductors


StreetWires FB8

8 Gauge Firewall Bushing



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Pyle Audio Store

General Features:

  • Hydra Series 4-Channel Marine Amplifier
  • Max Power Rating:
    • 14.4V DC ohms: 100 watts x 4 chan.
  • Max power output: 400 watts
  • Wired remote bass level control included
  • Variable input gain control
  • 4 channel operation
  • Speaker-level (high-level) inputs
  • Gold plated RCA inputs
  • Thermal, OOverload and Short Circuit protection
  • Heavy duty aluminum alloy heatsink
  • Load dump over voltage
  • 8 gauge power and ground wiring is required for installation
    • Contact us for information regarding a discount on select amplifier kits from our website when purchased together with this amplifier
  • Dimensions: 7.87"W x 8"L x 2"H
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Power Specifications - Full Range Channels

Peak Power Output
This form of power rating refers to the maximum amount of power an electronic device can handle or output in an instant without damage occurring. Often times this maximum is achieved during a brief musical burst, such as a drum accent, or low bass hit.

Some manufacturers display peak power ratings on the face of their products to increase the appeal to consumers. The RMS power rating is more accurate, and we recommend using it for product comparison.

100 watts x 4 channels

Amplifier Specifications

Marine Certified
Marine certified means that the unit has been designed and manufactured with a marine use in mind. It will withstand the harsh conditions that come from marine use. Generally, they are treated against UV rays and treated with special protective coatings.
Number of Channels
Each channel on an amplifier will power one speaker using a positive and negative cable. There are various types of amplifiers, each designed to power a certain number of speakers. Monoblock amplifiers, also known as single channel, are designed to power one or more subwoofers. These amplifiers often have very high power ratings. On the other hand, multi-channel amplifiers power multiple speakers, usually at lower power ratings. 2-Channel and 4-Channel amplifiers can power car speakers or low powered subwoofers. Occasionally you might see a 5 or 6-channel amplifier that can power speakers and subwoofers at the same time. The most common setup is a monoblock amp to run subwoofers and a 4-channel amp to run door speakers. Check out our Knowledge Base for more information.
Total Peak Power Output
The total peak power output is measured as the wattage per channel multiplied by the number of channels, and is calculated at the lowest level of operating impedance.

It is measured during a brief musical burst, such as a sudden drum accent. Some manufacturers display peak power ratings on the face of their products to increase the appeal.

The RMS power rating is more accurate, and we recommend using it for product comparison.

400 watts
Maximum Input Gauge Size
This is the largest gauge wire that will fit into the power and ground terminals of this device. The lower the gauge number, the thicker the wire is. For example, a 4 gauge wire is thicker than an 8 gauge wire and thus has higher current carrying capacity. Always do your best to get this size wire to reduce the risk of damage to your components.
Speaker Level Inputs
Speaker level inputs are commonly referred to as high-level inputs and vice versa. This input type allows you to get your audio signal directly from the speaker wire in your vehicle, instead of using RCA cables. The advantage of this is factory integration, as most stock radios do not have RCA outputs to run amplifiers.
Built-in Crossover

A crossover is a type of filtering system that permits only certain frequencies to play. A Low-Pass (LP) crossover allows only frequencies below its setting to get through which is good in the case of some subwoofers. A High-Pass(HP) filter allows frequencies above its setting to pass through, this is normally used on speakers.

When a crossover is set to FULL it means no filtering is added and the full frequency spectrum is allowed through the amplifier. Filtering is important because feeding a speaker frequencies it cannot reproduce effectively creates distortion.

Low-Pass (LP)
High-Pass (HP)

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Summary of Customer Ratings & Reviews

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Accessory Tools and Products

Accessories added


Universal Bluetooth Audio Receiver

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Universal Bluetooth Audio Receiver & Volume/Playback Controller Knob

Your Price $74.99


Universal Bluetooth Audio Receiver

Your Price $74.99

NVX V-Series RCA Interconnect Cable

19 ft. of 4-Channel RCA cable with dual twisted-pair conductors

Your Price $11.99

Kicker 4-Channel RCA Audio Interconnect Cable

4 Meters (13 ft.) 4-Channel K-Series RCA Audio Interconnect Cable

Your Price $19.99

StreetWires ZN7 RCA Interconnect Cable

16.4 ft. of 4-Channel RCA Cable with hyper twist construction, oxygen free copper, and precision machined tips.

Your Price $59.99

StreetWires FB8

8 Gauge Firewall Bushing

Your Price $6.95

Car/Marine Audio Installation Kit

Includes Test Light, Crimp/Splice Tool, Multi-bit Screwdriver and more.

Your Price $18.99

Browse 4 questions and 4 answers
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Why did you choose this?
Sonic Electronix Store
because it was cheap and affordable
Stephen b on Jul 24, 2015
The size, price and it's just for a Polaris RZR
Jeremy P on Apr 6, 2015
Just received this Amp. Since I am just using 2 rear channels for now, can I just connect the rear RCA input and speaker connections for now ??
G C on Jul 20, 2015
Best Answer: Hello,

Reply · Report · Rick MStaff on Jul 20, 2015
· Add Answer · I Have This Question Too (0)
will this work with a 10 " sub?
FRANK T on May 26, 2015
Best Answer: Hello Frank,

It is impossible to answer your question. Technically, Yes. However, obviously it will NOT work with a 10" sub that asking for ten times that which the amplifier is able to provide. Your question is like asking "will this truck pull a box?" Well, yes..unless the truck is a 92 Nissan Hardbody, and the box has an elephant in it. See? We need far more information to give an accurate response.

For future inquiries, please provide a Model Number, not a description. For further assistance, give our sales team a call.
Reply · Report · Rick MStaff on May 26, 2015
· Add Answer · I Have This Question Too (0)
Installed this amp, great improvement in sound. But now with using RCA preamp inputs I'm getting buzzing with engine speed. Didn't have it before. When I disconnect RCA inputs, use just the amp no noise. Amp wired direct to battery. Do I need shielded RCA cables or a filter? Thanks
A shopper on Jul 27, 2015
· Add Answer · I Have This Question Too (0)

Product Summary


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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Pyle PLMRA400