SKU: 88668798655

ESX QM-FOUR - 4 Channel Amplifier

Sale price$152.99 Regular price$169.99
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Ships within 48 hours · Estimated delivery Jul 12 - Jul 17

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Description

ESX QM-FOUR - 4 Channel AmplifierSpecifications 4 Channel Class D Mini Digital Amplifier 4 x 52 90 Watts RMS @ 4 2 2 x 180 Watts RMS @ 4 bridged HPF LPF 40 4000 Hz (CH1 2) HPF LPF 40 4000 Hz (CH3 4) Bass Boost 0 6 12 dB (CH1 2) Bass Boost 0 6 12 dB (CH3 4) Input Selector 2CH 4CH Dimensions 216 x 39 x 84 mm Efficiency up to 86% Features Efficient Class D Amplifier with ultra compact dimensions Heavy die cast Heatsink with perfect cooling characteristics Auto Turn On Function High

Specifications

  • 4-Channel Class D Mini Digital Amplifier
  • 4 x 52/90 Watts RMS @ 4/2 Ω
  • 2 x 180 Watts RMS @ 4 Ω bridged
  • HPF/LPF 40 - 4000 Hz (CH1/2)
  • HPF/LPF 40 - 4000 Hz (CH3/4)
  • Bass Boost 0 / 6 / 12 dB (CH1/2)
  • Bass Boost 0 / 6 / 12 dB (CH3/4)
  • Input Selector 2CH/4CH
  • Dimensions 216 x 39 x 84 mm
  • Efficiency up to 86%

Features

  • Efficient Class D Amplifier with ultra-compact dimensions
  • Heavy die-cast Heatsink with perfect cooling characteristics
  • Auto Turn-On Function
  • High Level Inputs with Error Protection System (EPS)
  • Start/Stop Ready
  • Compact Bass Remote Controller
  • RCA Inputs & Outputs (via Molex)
  • Clipping LED

 The approximately palm-sized 2-channel mini power amplifier QUANTUM QM-TWO caused amazement right after the presentation among ESX fans and connoisseurs of the car hifi scene. The small powerhouse with a whopping 240 watts RMS output was immediately traded as an insider tip. After last year's improved V2 version with incredible 300 W RMS performance topped that again, ESX is now adding two more models in the QUANTUM QM class: The powerful QM-FOUR power amplifier is now available for 4-channel applications, who want to drive a separate subwoofer, can now use the new monoblock QM-ONE. Both power bars deliver a whopping 360 watts RMS and are visually perfectly matched. Modern and efficient Class D technology is used in all models, combined with EPS, top features and perfect sound characteristics. The QM-ONE monoblock is not only visually the perfect play partner to match the QM-FOUR. If a separate woofer is also to be fired, its area of application is clearly defined. With a full 360 watts RMS at 2 Ω, sufficient steam is provided, and the bass level can even be conveniently adjusted using the remote control.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 88668798655

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4.2 ★★★★★
Based on 64 reviews
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Verified Purchase
JCK
Boise, US
★★★★★ 5
Would buy again
No issues with this product. The oversized T handles make it a bit easier to complete the plugs. Definitely easier for those who have trouble gripping smaller items to work with or for those with larger hands. Valve stem remover was nice quality and nice to have additional valve stems. Would buy again. Wish it had a better case but I can't complain for the price.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 6, 2025
S
Verified Purchase
Sharon McGlynn
Whiting, US
★★★★★ 5
Worth the money
.
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Reviewed in the United States on May 9, 2026
E
Verified Purchase
Ernesto Guerrero
Charlottesville, US
★★★★★ 5
great kit
complete kit for traveling/emergency, would buy again when i use all the parts from this one.
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Reviewed in the United States on May 6, 2026
M
Verified Purchase
Mark
Draper, US
★★★★★ 5
Got a hole in your tire? Get this kit. It works great.
This was purchased in a pinch, and it plugged the hole on the tire first try. it is still holding to this day.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 26, 2026
P
Verified Purchase
Practical Reviewer
Phoenix, US
★★★★★ 5
Complete, Heavy-Duty Kit That’s Great to Have on Hand
Color: Vivid Orange
This ETENWOLF tire repair kit is one of those things you hope you don’t need—but are really glad to have when you do. It’s a well-rounded kit with everything needed to handle common tire punctures on cars, trucks, motorcycles, or even ATVs. The tools feel sturdy and durable, not flimsy like some cheaper kits. The handles provide a good grip, which makes the repair process easier, especially when working with tougher tires. The plugs seal punctures effectively and hold up well once installed. The bright orange case makes it easy to find in your trunk or garage, and everything stays organized inside so you’re not digging around for pieces. It’s also compact enough to keep in a vehicle without taking up much space, making it a great emergency backup. Suggestions for improvement: Including a quick instruction guide or diagram would be helpful for beginners. Also, adding a small pair of gloves could make roadside use a bit cleaner and easier. Overall, a reliable and well-equipped tire repair kit that’s a smart addition to any vehicle.
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Reviewed in the United States on April 5, 2026

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