Hero image 0 of 2014 - 2018 GMC Sierra Crew Cab Harmony HA-R104 Dual 10" Sub Box CXA400.1 Amp, 0 of 3

2014 - 2018 GMC Sierra Crew Cab Harmony HA-R104 Dual 10" Sub Box CXA400.1 Amp

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Key item features

1 x 2014 - 2018 Chevy Silverado Crew Cab Truck Dual 10" Sub Box Subwoofer Enclosure
2 x Harmony Audio HA-R104 Rhythm Series 10" - Package Sub
1 x Kicker CX300.1 Car Audio CX Series Class D Subwoofer Amplifier 600 Watt Sub Amp - Limited Stock
1 x Harmony Audio HA-AK10 Car Stereo Complete 10 Gauge 600W Amp Amplifier Install Kit - Nickel
2014 - 2018 Chevy Silverado Crew Cab Truck Custom Dual 10" Subwoofer Enclosure Sub Box Mounting Depth: 6-1/2" Air Space: 0.74 Cubic Feet per Sub Sealed Enclosure
Mounting Depth: 6-1/2"
Air Space: 0.74 Cubic Feet per Sub
Sealed Enclosure
Mounting Depth: 6-1/2"
Air Space: 0.74 Cubic Feet per Sub
Sealed Enclosure
Constructed with High Quality MDF
High Quality Twist Knob / Banana Plug Terminal Cup (Bare Wire 'up to 10GA')
High Quality Black Carpet
Overall Dimensions: 49-1/2" L X 16-1/2" W X 9-3/4" H
Enclosure installs under the rear seat, subs fire downward
2014 - 2018 Chevy Silverado Crew Cab Truck
10" Rhythm Series Car Subwoofer
Power Handling: Peak: 500 watts RMS: 250 watts
Peak: 500 watts
RMS: 250 watts
Peak: 500 watts
RMS: 250 watts
Sensitivity: 86.1dB
Frequency Response: 30Hz-1.5kHz
Mounting Depth: 5 5/16"
Mounting Cutout Diameter: 9 1/4"
Min Sealed Box Volume (Cubic Feet): 1.0
Max Sealed Box Volume (Cubic Feet): 2.46
Min Vented Box Volume (Cubic Feet): 1.18
Max Vented Box Volume (Cubic Feet): 1.97
Single 4 Ohm
CX Series Single-Channel Class D Car Amplifier
RMS Power Rating: 4 ohms: 150 watts x 1 chan. 2 ohms: 300 watts x 1 chan.
4 ohms: 150 watts x 1 chan.
2 ohms: 300 watts x 1 chan.
4 ohms: 150 watts x 1 chan.
2 ohms: 300 watts x 1 chan.
Max power output: 600 watts x 1 chan.
Pulse Width Modulated MOSFET power supply
LED power (green) and protect (red) indicators
Variable Bass Boost (0 to +12 dB bass boost at 40 Hz)
Single channel operation
Speaker-level (high-level) inputs with signal sensing for automatic turn-on
Preamp RCA outputs to daisy chain multiple amps
3-way protection circuitry (thermal, overload, and speaker short protection)
Dual speaker terminals simplify the hookup of multiple speakers
Heavy duty aluminum alloy heat-sink
Nickel-plated RCA level inputs
Nickel-plated screw terminals
Input sensitivity: Low level: 125mV-5V High level: 250mV-10V
Low level: 125mV-5V
High level: 250mV-10V
Low level: 125mV-5V
High level: 250mV-10V
Variable low-pass filter (50-200 Hz, 12 dB/octave)
Subsonic filter (24 dB at 25 Hz)
CEA-2006 compliant amplifier
Frequency response: 25-200 Hz
8 gauge power and ground wiring is required for installation.
Dimensions: 7-3/16"W x 8-1/8"D x 2-3/8"H

Specs

Rms power rating
250 W
Woofer size
10 in
Subwoofer type
Subwoofer
Brand
Harmony Accessory Master
Subwoofer enclosure type
Sealed
Impedance
4 ohm

Current price is $384.95

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Columbus, 43215

Arrives by Mon, Apr 13

Sold and shipped by HiFiSoundConnectionPro Seller

4.248979591836735 stars out of 5, based on 980 seller reviews(4.2)

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About this item

Product details

Upgrade your 2014–2018 GMC Sierra Crew Cab’s audio system with the Harmony HA-R104 Dual 10" Subwoofer Box paired with the Kicker CXA400.1 Amplifier. Designed for a final 2-ohm load, this combo delivers clean, punchy bass and efficient power handling, making it the ideal setup for everyday music lovers and serious audio enthusiasts alike.

The Harmony HA-R104 sub box is custom-built to fit perfectly under the rear seat of your Sierra Crew Cab, maintaining your truck’s interior space while packing impressive low-end performance. With its dual 10" configuration, it produces tight, distortion-free bass that enhances all music genres—from hip-hop to rock and beyond.

Matched with the reliable Kicker CXA400.1 mono amplifier, this system provides consistent power output to maximize your subs’ potential. Built from durable, high-quality materials, the HA-R104 and CXA400.1 combo ensures long-lasting performance, making it a smart and seamless audio upgrade for your GMC Sierra.

1 x 2014 - 2018 Chevy Silverado Crew Cab Truck Dual 10" Sub Box Subwoofer Enclosure
2 x Harmony Audio HA-R104 Rhythm Series 10" - Package Sub
1 x Kicker CX300.1 Car Audio CX Series Class D Subwoofer Amplifier 600 Watt Sub Amp - Limited Stock
1 x Harmony Audio HA-AK10 Car Stereo Complete 10 Gauge 600W Amp Amplifier Install Kit - Nickel
2014 - 2018 Chevy Silverado Crew Cab Truck Custom Dual 10" Subwoofer Enclosure Sub Box Mounting Depth: 6-1/2" Air Space: 0.74 Cubic Feet per Sub Sealed Enclosure
Mounting Depth: 6-1/2"
Air Space: 0.74 Cubic Feet per Sub
Sealed Enclosure
Mounting Depth: 6-1/2"
Air Space: 0.74 Cubic Feet per Sub
Sealed Enclosure
Constructed with High Quality MDF
High Quality Twist Knob / Banana Plug Terminal Cup (Bare Wire 'up to 10GA')
High Quality Black Carpet
Overall Dimensions: 49-1/2" L X 16-1/2" W X 9-3/4" H
Enclosure installs under the rear seat, subs fire downward
2014 - 2018 Chevy Silverado Crew Cab Truck
10" Rhythm Series Car Subwoofer
Power Handling: Peak: 500 watts RMS: 250 watts
Peak: 500 watts
RMS: 250 watts
Peak: 500 watts
RMS: 250 watts
Sensitivity: 86.1dB
Frequency Response: 30Hz-1.5kHz
Mounting Depth: 5 5/16"
Mounting Cutout Diameter: 9 1/4"
Min Sealed Box Volume (Cubic Feet): 1.0
Max Sealed Box Volume (Cubic Feet): 2.46
Min Vented Box Volume (Cubic Feet): 1.18
Max Vented Box Volume (Cubic Feet): 1.97
Single 4 Ohm
CX Series Single-Channel Class D Car Amplifier
RMS Power Rating: 4 ohms: 150 watts x 1 chan. 2 ohms: 300 watts x 1 chan.
4 ohms: 150 watts x 1 chan.
2 ohms: 300 watts x 1 chan.
4 ohms: 150 watts x 1 chan.
2 ohms: 300 watts x 1 chan.
Max power output: 600 watts x 1 chan.
Pulse Width Modulated MOSFET power supply
LED power (green) and protect (red) indicators
Variable Bass Boost (0 to +12 dB bass boost at 40 Hz)
Single channel operation
Speaker-level (high-level) inputs with signal sensing for automatic turn-on
Preamp RCA outputs to daisy chain multiple amps
3-way protection circuitry (thermal, overload, and speaker short protection)
Dual speaker terminals simplify the hookup of multiple speakers
Heavy duty aluminum alloy heat-sink
Nickel-plated RCA level inputs
Nickel-plated screw terminals
Input sensitivity: Low level: 125mV-5V High level: 250mV-10V
Low level: 125mV-5V
High level: 250mV-10V
Low level: 125mV-5V
High level: 250mV-10V
Variable low-pass filter (50-200 Hz, 12 dB/octave)
Subsonic filter (24 dB at 25 Hz)
CEA-2006 compliant amplifier
Frequency response: 25-200 Hz
8 gauge power and ground wiring is required for installation.
Dimensions: 7-3/16"W x 8-1/8"D x 2-3/8"H

info:

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Specifications

Rms power rating

250 W

Woofer size

10 in

Subwoofer type

Subwoofer

Brand

Harmony Accessory Master

Warranty

Warranty information

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