SKU: 88668798655

ESX QM-FOUR - 4 Channel Amplifier

$152.99 $169.99
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Ships within 48 hours · Estimated delivery Aug 6 - Aug 11

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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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4.8 ★★★★★
Based on 20 reviews
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Product Reviews
M
Verified Purchase
McKay Marshall
Boise, US
★★★★★ 5
Solid, Quality Construction at a Value
Style: Classic, Size: 26in
It's amazing how much fun my new puppy and I have been having with a single, vacuum-molded piece of plastic. I have a 4mo named Walter and getting a Chuckit® was always in the cards. 1: I didn't know how cheap they were, and 2: I didn't realize how much fun it makes fetch. Really small things like being able to pick up the ball with the Chuckit® without having to bend down was so surprising and makes fetch last longer for both of us. Another tip is that I had watched videos where they say the throwing technique is sort of a punch, or whip action; where you sort of wind-up, throw, and then jerk your hand back (like cracking a whip). I started doing that and it was fine, and working without problems. But then I thought, "I'm just going to launch this with one continuous movement". And WOW what a difference. If you have the space (a big field, basically), you don't need to modify your throw to a punch or whip type movement. Just launch it like you're casting a fishing pole, and end your motion with the Chuckit® pointing directly at where you're trying to throw it. The ball naturally flies out at about a 45 degree angle. High and far. You don't need to overthink it. Additionally, if I'm in my backyard (fenced with neighbors all around) and I can't go high and far, I just side-arm it. And the ball releases on it's own. No need to whip. Looking forward to my Pup growing up so we can play longer. Love this thing. Oh one more tip from my brother– he says a lacrosse ball fits perfectly in these things too if you have a dog that wants to destroy your tennis balls. Lacrosse balls are practically indestructible. Just make sure not to launch it on any surface that will bounce, or you'll never see it again. I'd buy this again in a heartbeat. For the price, stop thinking about it, buy it, and go play with your dog!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 10, 2020
V
Verified Purchase
Veronika Pechova
Houston, US
★★★★★ 5
Superior quality
Style: Classic, Size: 26in
We have 2 Australian Shepherds that never get tired. The launcher is able to trow the ball very far and very durable. Dogs love the ball and they were not able to destroy it yet. We are very happy with our purchase.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 3, 2026
M
Verified Purchase
Megan & Andrew
Birmingham, US
★★★★★ 5
Fetch? Yes please!
Style: Classic, Size: 26in
Great for fetch. Small learning curve to release the ball where you want. Good size for my dog. Comes with a felt ball which is just stupid for fetch--gets so dirty. I like the color, my dog can see blue and she loves when I bring it out. I broke my first one, snapped the neck, but these work great, fine price. The amount of joy my dog gets from it is worth every penny.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 30, 2025
R
Verified Purchase
Ramona O.
New York, US
★★★★★ 4
Function is great, a bit breakable
Style: Classic, Size: 26in
This is probably the 3rd or 4th of this we've bought which reflects pros and cons--it is a great thrower, easy to use and great for keeping your hands clean with a dog who loves to play fetch! The con is that they're a bit brittle. We've broken a couple just smacking the plastic against a sidewalk, so you just have to be a little careful. Our puppy chewed on another one and destroyed it, so you might want to keep it out of the reach of your dogs when you're not using it!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 25, 2025
N
Verified Purchase
NSandler
Chelsea, US
★★★★★ 5
Best toy EVER for a very active dog!
Style: Classic, Size: 26in
This is the best item I've purchased for my young Mini Schnauzer. He absolutely loves that I can now pitch the tennis ball quite a ways and he gets loads of running time. He begs for me to use this toy for him . . . he LOVES it! Easy on the arm as well!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 23, 2025

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