JVC KS-DR1004D Marine Amplifier with Rockville RWB90B Speakers — main product image

JVC KS-DR1004D Marine Amplifier with Rockville RWB90B Speakers

JVC

JVC KS-DR1004D Marine Amplifier with Rockville RWB90B Speakers

Name: JVC KS-DR1004D Marine Amplifier with Rockville RWB90B Speakers
Brand: JVC
SKU: KS-DR1004D+(2) RWB80B RZR

★★★★★5.0 (1 reviews)

300w400W45W90W1W

JVC 4-channel marine amplifier bundled with Rockville 8" wakeboard tower speakers for powerful outdoor audio on UTVs and boats.

$377.60*

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*Price sourced from Amazon.com. Last updated:Jun 04, 2026.Price and availability are subject to change.

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Overview

The JVC KS-DR1004D and Rockville RWB90B bundle is a matched amplifier-and-speaker package designed for outdoor vehicles and marine applications where standard car audio simply cannot cope with the environment. The JVC KS-DR1004D is a 4-channel marine amplifier built to withstand moisture, salt, and temperature extremes, providing dedicated amplification channels that keep audio clean and powerful even at high volumes. Paired with two Rockville RWB90B 8-inch wakeboard tower speakers rated at 300 watts peak and 200 watts RMS, this combination is engineered to project sound in open-air settings — exactly where you lose audio to wind, water, and engine noise.

The Rockville speakers mount to roll bars and wakeboard towers with a clamp system that fits bars between 1.26 and 2.87 inches in diameter, covering the majority of Polaris RZR roll cages, ATV/UTV frames, golf cart roofs, and boat tower tubes. The 8-inch drivers with a frequency response of 60–20,000Hz and 98dB sensitivity deliver respectable mid-bass punch and clear highs across the audible spectrum. The 4-ohm impedance is standard for automotive and marine amplifiers, ensuring efficient power transfer. Keep in mind that the 10.5-inch mounting depth requires adequate clearance, and you will need to supply your own amplifier wiring kit, speaker wire, and a head unit or Bluetooth source to complete the installation.

Key Features

Package Includes: (1) JVC KS-DR1004D 400 Watt 4-Channel Marine Amplifier For Polaris RZR/ATV/UTV/Cart. (2) Pair Rockville RWB90B Black 8" 300w Marine Wakeboard 360° Swivel Tower Speakers.

Specifications: Amplifier. Maximum Power Output 400W. RMS Power Output (4 ohm) [ 1% THD 14.4V] 45W x 4 (20 - 20,000Hz). RMS Power Output (2 ohm) [ 1% THD 14.4V] 45W x 4 (1,000Hz). RMS Power Output (Bridged 4 ohm) [ 1% THD 14.4V] 90W x 2 (1,000Hz). Class Class-D. Signal-to-Noise Ratio (reference: 1W into 4 ohms), CEA-2006 Compliant > 82dB.

Load Impedance. Load Impedance Allowance 2 - 8 ohms. HPF 50Hz - 200Hz (-12dB/oct). LPF 50Hz - 200Hz (-12dB/oct). RCA Input Ach L/R, Bch L/R. High Level Input (Speaker Level Input) Yes. High Level Input Auto Power Control (Signal Sensing Turn On) Yes. Input Sensitivity 0.2 - 5V. Dimensions (W x H x D) 145 x 45 x 99 mm (5-11/16" x 1-3/4" x 3-7/8"). Weight 0.7kg (1.5lbs).

Features: Pair Rockville RWB90B Black 8" 300w Marine Wakeboard 360° Swivel Tower Speakers. 8" Two-Way High Fidelity Speaker System. Adjustable Nylon Mounting Bracket Reinforced With Embedded Steel. Includes Stainless Steel Mounting Hardware. 1" Polymide Dome Neodymium Midrange Tweeter.Built-In Two-Way Crossover Network.

Fully Marinized Against Salt & Fresh Water Conditions. Completely Water / Rust Resistant. Terminals Are Sealed with Rubber Gaskets. Specially Tuned for PA Voice Over. Polypropylene Mica Injected Cone with Santoprene Surround. High BL Magnet Motor Structure. Y30 High Density Magnets. Oversized 1.25” Kapton Voice Coil.

Specifications

Amplifier

JVC KS-DR1004D 4-Channel Marine Amplifier

Speakers

Rockville RWB90B 8" Marine Wakeboard Tower Speakers (pair)

Speaker Peak Power

300 Watts

Speaker RMS Power

200 Watts

Frequency Response

60–20,000 Hz

Sensitivity

98dB @ 1w/1m

Impedance

4 Ohms

Speaker Mounting Depth

10.5"

Roll Bar Compatibility

1.26" – 2.87" diameter

Speaker Color

Black

Pros & Cons

👍 Pros

Complete amp-and-speaker bundle eliminates the guesswork of matching components for outdoor audio
Roll bar mounting accommodates a wide range of bar diameters from 1.26 to 2.87 inches
200 watts RMS per speaker pair delivers substantial volume for open-air environments where sound dissipates quickly
4-channel amplifier provides dedicated power channels for clean, distortion-free output at higher volumes
8-inch speaker drivers produce fuller bass response than smaller marine speakers commonly found in budget kits

👎 Cons

10.5-inch mounting depth on the speakers requires significant clearance behind the mounting point
Amplifier wiring and speaker wire are not included, adding to the total installation cost
No specific IP rating is listed for the amplifier or speakers, making it difficult to assess exact water protection levels
The bundle does not include a head unit or source device, so you need an existing stereo or Bluetooth receiver
Speaker frequency response starts at 60Hz, so deep bass below that range will be absent without a subwoofer

Frequently Asked Questions

What vehicles and vessels are the tower speakers designed to mount on?

The Rockville RWB90B speakers use a large mounting screw that accommodates roll bars from 1.26 to 2.87 inches in diameter, making them compatible with Polaris RZR, ATVs, UTVs, golf carts, and marine wakeboard towers.

Are the speakers weather-resistant for marine and off-road use?

The Rockville RWB90B speakers are designed for outdoor marine and off-road environments. Their construction is intended to handle exposure to water spray, dust, and UV, which is standard for wakeboard tower speakers.

What is the power output of the JVC KS-DR1004D amplifier in this bundle?

The listing specifies the speaker power handling at 300 watts peak and 200 watts RMS per pair. The JVC KS-DR1004D is a 4-channel marine-rated amplifier designed to drive speakers in this power range, but the exact per-channel amplifier output is not detailed in this listing.

How deep do the speakers need to be for mounting clearance?

The speakers have a mounting depth of 10.5 inches, so you need to ensure your roll bar or tower mounting location provides adequate clearance behind the speaker enclosure.

Do I need any additional wiring or hardware to install this bundle?

You will need amplifier wiring (power, ground, and signal cables) to connect the JVC amplifier to your vehicle's battery and head unit. The speakers include the tower mounting hardware for roll bars, but speaker wire to run from the amplifier to each speaker is also required.