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SoundExtreme ExtremeSub ES08

Weather-proof 250-watt powered tube enclosure with one 8" 4-ohm subwoofer and 8" passive speaker (Black)

Item # 695EXSW801

Want more bass? This sub connects wirelessly to your SoundExtreme soundbar.

Find what Fits your vehicle


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Want more bass? This sub connects wirelessly to your SoundExtreme soundbar.

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4 questions - 4 answers

Item # 695EXSW801

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About the SoundExtreme ExtremeSub ES08

Bob Bihlmayer

Even more bass

SoundExtreme soundbars provide great sound and LED lighting for your golf cart, ATV/UTVs, or boat. But if you're craving more bass, add on the ExtremeSub ES08 subwoofer. It connects wirelessly to your SoundExtreme soundbar and offers the same outdoor-ready durability you enjoy with your other SoundExtreme products.

Even more bass

SoundExtreme soundbars provide great sound and LED lighting for your golf cart, ATV/UTVs, or boat. But if you're craving more bass, add on the ExtremeSub ES08 subwoofer. It connects wirelessly to your SoundExtreme soundbar and offers the same outdoor-ready durability you enjoy with your other SoundExtreme products.

A perfect pair

This powered sub pumps out 250 watts RMS (500 watts peak) to an 8" subwoofer and an 8" passive radiator. You can connect it to any stereo or soundbar via its wired input, but it really shines with the SoundExtreme soundbars. EcoCAST Bluetooth pairing lets you connect to EcoXGear's soundbars wirelessly; the sub automatically remembers the last speaker connected. A handy wired remote control allows you to adjust the volume level on the fly, while a built-in crossover lets you dial the sub into your system.

Light up the night

Festive LED lighting adds an extra touch of style. The lights can automatically sync to the bass tones, flash, or display a solid color output. Note: the lights will not sync to the SoundExtreme soundbars' lights since they're working from the bass signal rather than a full-range signal.

Rugged and adaptable

The tube-style enclosure is IP66 rated for water, dirt, and dust resistance so you know it will keep on rocking in any and all conditions you're likely to see. Brackets for horizontal and vertical mounting are included, as well as offset brackets for horizontal mounting on an uneven surface.


Product highlights:

  • sealed enclosure with one 8" subwoofer and 8" passive radiator
  • passive radiator augments bass response without port noise
  • built-in amplifier (250 watts RMS power)
  • RGB LED lighting
  • durable plastic enclosure
  • IP66 rated for water, dirt, and dust resistance
  • 12-volt connection required
  • frequency response: 20-300 Hz
  • dimensions: 13.75"L x 8.97"W x 9.25"D
  • warranty: 1 year
  • MFR # GDI-EXESW801

What's in the box:

  • Powered 8" subwoofer (attached 11" power/ground/input harness)
  • 6.6' Power/ground harness (inline 30A ATO fuse)
  • Remote level control w/ attached 16' cable terminated in a 3.5mm TRS connector
  • 10' Aux input cable terminated in male 3.5mm TRS connectors on both ends
  • 6.5' Remote turn-on wire (banana plug on one end / bare wire on other end)
  • Horizontal mounting plate
  • 2 Vertical mounting brackets
  • 2 Horizontal-mount standoffs
  • Eight 3-1/2" bolts
  • Eight 3" bolts
  • Ten 22mm screws
  • 8 Nuts
  • 8 Large flat-washers
  • 10 Small flat-washers
  • 8 Large lock-washers
  • 10 Small lock-washers
  • User guide
  • Warranty registration card

Customer reviews for SoundExtreme ExtremeSub ES08

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4.5 out of 5 stars
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More details on the SoundExtreme ExtremeSub ES08

Pat M.

Features & specs

Enclosure Type Passive Radiator
Finish Material Plastic
Grille Plastic spoke-style
Connector Type Harness
Quick-disconnect Plug Yes
Bi-amp Inputs No
Woofer Size (inches) 8
Woofer Material Polypropylene
Passive Radiator 8
Width 13-3/4"
Height 9"
Depth 9-1/4"
Parts Warranty 1 Year
Labor Warranty 1 Year
Frequency Response 20-300Hz
Amplifier Power (RMS) 250 watts
Maximum Wattage 500 watts
Sensitivity N/A
Impedance N/A
Second Voice Coil Impedance N/A
Crossover Point 50-275Hz

Product Research


Overview: The SoundExtreme Extreme Sub ES08 is an 8" powered subwoofer with an integrated RGB LED lighting system, designed for ATVs, off-road vehicles, marine craft, and golf carts. The powersports subwoofer features a built-in 500 watt Class-D amplifier, that powers the 8" marine-grade driver, and an 8" (non-powered) passive radiator. The ES08 is housed in a durable weather-resistant enclosure that can be mounted vertically or horizontally. The powersports subwoofer includes a 3.5mm (1/8") stereo Auxiliary input, along with Bluetooth connectivity to an optional EcoCast soundbar (sold separately) for a full-range audio system with Bluetooth audio streaming capability.

Driver & Enclosure: The ES08 features an 8" subwoofer driver and an 8" passive radiator housed in a durable sealed enclosure that's IP66 rated for the outdoor environment.

500W Max Power: The Extreme Sub ES08 employs a 250W RMS (500W peak) Class-D amplifier for loud, dynamic sound performance that can be heard out in the open field or over the open water.

EcoCast: EcoCast technology lets you increase the size of the party by letting you connect multiple EcoCast-equipped speakers (up to 50) to one SoundExtreme EcoCast speaker when using Bluetooth Audio as the sound source (additional soundbars and subs sold separately). The playback speaker can then broadcast its Bluetooth Audio to the other speakers, with a range of up to 30 feet. The Extreme Sub ES08 can be quickly and easily paired to additional SoundExtreme speakers to create a complete sound system.

Note: The SoundExtreme ES08 does not support direct Bluetooth Audio streaming and must be paired to a compatible SoundExtreme soundbar (sold separately) for this feature.

Aux Input/Output: The Extreme Sub ES08 is equipped with a 3.5mm Aux input for connecting a portable audio source with an audio or headphone output. The Aux input port includes a waterproof rubber cap for added protection when not in use. 

Integrated RGB LEDs: The SoundExtreme ES08 features RGB LED back-lit subwoofer driver and passive radiator that can light up the speaker/radiator cones. A Party Lights button on the control panel lets you cycle through 12 available Party Light Modes: Red, Green, White, Blue, Orange, Cyan, Yellow, Purple, Music Sync, Fade7, Jump7, and Color Fade.

Controls & Indicators: Operation of the ES08 is done using the subwoofer's control panel. Weather-proof rubber buttons let you easily operate the sub, even with gloves on, providing the following:

  • Source Indicators: Two LEDs can light to indicate the currently selected input source - Aux or EcoCast.
  • Gain: + and - buttons let you adjust the input sensitivity or Gain for the optimum signal level. Nine incremental LEDs will light to provide a visual reference of the amount of gain applied. When the volume is adjusted on a connected SoundExtreme soundbar, the subwoofer's volume will also change, letting you use the Gain to balance the relative volume between the two units.
  • Crossover: Two arrow buttons let you adjust the low-pass filter cutoff frequency from 50Hz to 275Hz. Nine incremental LEDs will light to provide a visual reference of the selected cutoff frequency.
  • Phase: This push-button determines if the subwoofer signal is in-phase (0˚) or out-of-phase (180˚). The Aux LED indicator will flash Green 3 times for in-phase and Red 3 times for out-of-phase when the Phase button is pressed.
  • EcoCast: When pressed, this push-button puts the ES08 subwoofer into EcoCast Receiving mode when paired with a compatible SoundExtreme soundbar, and is also used to initiate pairing.
  • Party Lights: Cycles through the 12 available Party Light Modes.
  • Auto Turn-On: A rear-panel rotary switch determines how the ES08 will be activated:
    • Remote: Lets you use the supplied blue Turn-On wire connected to a switched +12V power source to activate the subwoofer.
    • Audio: This mode uses an audio signal on the Aux Input to activate the sub.
    • DC: The ES08 will be activated when there's +12V applied to the main power wire. This can be used if the main power is connected to a switched power source in the vehicle or craft.

Wired Level Control: The SoundExtreme ES08 includes a wired level control for remotely adjusting the subwoofer volume from the front of your vehicle or craft. The compact level control can be mounted under a dash or console and includes an attached 16' cable that plugs into the soundbar.

Power Requirements: The SoundExtreme ES08 will require 12-volt power and ground connections to your vehicle or craft. A 6.6' power/ground harness with an in-line 30A ATO fuse is included.

Mounting Options: The ES08 includes hardware for mounting the sub either vertically or horizontally, providing maximum mounting flexibility. 2" Standoffs are included for horizontal mounting if additional clearance is required.

  • Horizontal Mounting Dimensions:
    • Width: 16.10"
    • Height: 9.70" (11.70" with standoffs)
    • Depth: 9.25"
  • Vertical Mounting Dimensions:
    • Width: 12.0"
    • Height: 14.60"
    • Depth: 9.25"

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Customer Q&A

4 questions already asked

Will a pair of these both connect to an ecoxgear sound bar with the ecocast?
brad  Dec 28, 2022
1 answer
Only one subwoofer can be paired to the sound bar.
arielle h  Dec 28, 2022 (Staff)
Can this sub be plugged into a JBL head unit and not blue tooth?
jody  Aug 28, 2022
1 answer
It is possible to connect a head unit to this subwoofer using the AUX input and an RCA-to-3.5mm adapter. Our advisors would be happy to help with this project. Please give us a call at 1-800-324-9695.
zachary  Aug 28, 2022 (Staff)
I use my EcoXgear SED32 on Bluetooth. Can it talk to both my iPhone and this sub concurrently on Bluetooth? Or do I have to hard-wire the sub to my SED32?
g john  Aug 01, 2022
1 answer
So this EcoCgear ExtremeSub will need to be hardwired, Kidd. You've got that 3.5 aux output on your EcoXgear SED32 and that included aux cable with the sub plugs right in. Since the ExtremeSub has no onboard Bluetooth it will need to be hardwired.
bo  Aug 01, 2022 (Staff)

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