SKU: 88668798655

ESX QM-FOUR - 4 Channel Amplifier

$152.99 $169.99
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Ships within 48 hours · Estimated delivery Sep 26 - Oct 1

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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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4.6 ★★★★★
Based on 5 reviews
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Product Reviews
P
Verified Purchase
Paul groth
Whiting, US
★★★★★ 5
Awesome!
**update: we have had this toy for over a year! I have found one other con. Once chewed if you step on it you will immediately drop to the floor in agonizing all encompassing pain or (my personal favorite) say every dirty curse word you have ever heard while clutching your destroyed instep. BUT even though this chewed bone is the demon child of a LEGO and a race car to step on my dogs still love it, still chew it and we haven’t had to replace it yet! I have an insane chewer where toys usually last us less than 24 hours. It has become almost impossible for us to keep up with toys because of how expensive it has become. This toy is not only insanely durable but she has not left it alone for the 3 days we’ve had it. I was concerned that being “chicken flavored” would mean stinky or sticky and I was very pleasantly surprised that it was neither! It doesn’t leave a stain once chewed, it doesn’t smell, and it doesn’t have a weird coating on it. The only con so far is that due to it being so durable and hard it makes a loud noise when dropped on the tile or hardwood which made her nervous toward it at first but now that she’s started working on it she could care less about the noise. Super happy with this purchase and will 100% buy more in various sizes for our other pups.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 26, 2023
A
Verified Purchase
Anna
New York, US
★★★★★ 5
Quieter than most toys and my dog loves them
Color: Football, Size: One-Size
These footballs have saved my life. I think I’ve bought close to 10 at this point? And toys primarily living outside in Texas heat is the only reason I’ve had to buy so many. In general, they are pretty durable but will get cracked if you leave them in the sun. I have a German Shepherd who absolutely loves playing in the backyard but also takes his responsibilities as a guard dog very seriously so he barks a LOT while he is out there and unfortunately we live in the suburbs so I’m constantly bringing him inside that way he isn’t bothering the neighbors. That is, until I got this football. The grunts are pretty quiet which is a win in my book because my dog communicates by way of squeak toy. You might think I’m joking but if I have guests over and we are having a conversation, he comes in the room and squeaks his toys violently to participate in the discussion. For that reason, it takes me an hour to pick out a new toy at the store because I stand in the aisle squeaking every single once until I find one I think I can handle listening to 24/7. If you’re reading this review, you probably know that at a certain point, the squeaks can become unbearable. If that’s why you’re looking at this toy, you don’t have to read any further. Just buy it, you won’t regret it. That is reason enough for me to rate this 5 stars. But the story doesn’t end there. What I did not foresee was him also using this wonderful grunting football to communicate with the neighbors. Now instead of barking outside, he grabs one of these footballs and squeaks it for all he’s worth while bucking around in circles like a bull. He still does it after having broken the noise maker in the toys. He just loves them so much. Can I guarantee your dog will also take to squeaking this toy over barking? No. I didn’t do anything special to get him to do that, and I doubt I could train another dog to do so. Regardless, this toy has single handedly solved a lot of my dogs endearing but somewhat annoying habits in ways I could not have anticipated so maybe it’ll work for you too.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 7, 2023
K
Verified Purchase
Katherine Pietranek
Dallas, US
★★★★★ 5
My dog's FAVORITE!
Color: Bunny (Red), Size: One-Size, Color: Bunny (Red), Size: One-Size
She goes through so many toys because she basically destroys them. This one the squeaker part broke after maybe a day or two but that's okay because she absolutely love this toy so much she wouldn't go anywhere without it. Even brought it with her on her walks which was completely a new thing. I hadn't seen her do that. She did not want to let it go. And she wanted to show it off to everyone. And when she gets upset when she is hanging out on the deck she will grab it to ease her anxiety. She also grabs it when she wants to show it off to other dogs. And she definitely wants to play tug of war with it as well which isn't a good idea. If you play tug of war it's going to come apart pretty easily. Other than that I would say it took about 3 weeks for it to rip apart. I'm on the fourth one in about 6 months. She still has the ones that are split in half. But anytime I bring back a new one she gets so unbelievably excited and carries it with her everywhere again
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Reviewed in the United States on May 24, 2026
L
Verified Purchase
Lori
West Palm Beach, US
★★★★★ 4
Good and sturdy but needs better squaker.
Color: Bunny (Red), Size: One-Size
My Boxer loves these but she kills the squakers in them.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 10, 2026
L
Verified Purchase
Laci
Natrona Heights, US
★★★★★ 5
Best ball for best dogs
Color: Tennis Ball (Green), Size: 1 Count (Pack of 1)
This is my dogs favorite toy I have to buy 4 at a time and keep them on hand. Please do not stop making these it will break his heart. He loves the sound and even after he breaks(hes a very hard chewer no fault to the ball) them hell play with them
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 16, 2026

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