SKU: 88668798655

ESX QM-FOUR - 4 Channel Amplifier

Sale price$152.99 Regular price$169.99
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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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Theresa C.
Lake Worth, US
★★★★★ 5
They Work
Husband struggles with cracking feet, he has tried so many home remedies these work great to keep the moisturizer on and the carpet dry!
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Reviewed in the United States on March 25, 2026
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raymond jones
Dallas, US
★★★★★ 1
Not worth the time or money
Never buy these, they causes feet cramps and bad pain even if you use foot pain cream
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Reviewed in the United States on April 30, 2026
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Verified Purchase
Greg from MidW
Grantham, US
★★★★★ 3
Does the job but dangerous to walk with!
Does the job but dangerous to walk with: foot is sliding inside the sock if the foot was treated with cream or lotion prior. It is uncomfortable to sleep with but a necessary hurdle to heal your heels!
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Reviewed in the United States on December 24, 2025
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Texgurl
Houston, US
★★★★★ 4
Does the trick
Bought it with urea cream for my senior dad who was diabetes. Careful with it, it will tear
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Reviewed in the United States on April 6, 2026
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Amazon Customer
Lake Worth, US
★★★★★ 5
The really work!
Bought these or a friend with severely dry cracked feet. The change was significant and immediate. They wore them around the house for a day and that night they could already feel the difference.
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Reviewed in the United States on January 12, 2026

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