SKU: 99576356813

ESX QS-FOUR - 4 Channel Amplifier

Sale price$171.90 Regular price$191.00
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Description

ESX QS-FOUR - 4 Channel AmplifierWith an impressive 2 x 95 watts RMS at 2 , the little QUANTUM QS TWO is anything but slim. On the contrary, it drives loudspeaker systems with 4, 3 or 2 impedance without difficulty and remains very stable even under critical loads. With a mono bridge output of 190 watts RMS at 4 , it can also elicit a lot of bass from subwoofers. Incidentally, it impresses with its high end sound: thanks to the huge bandwidth of up to 60,000 Hz and a sensationally

With an impressive 2 x 95 watts RMS at 2 Ω, the little QUANTUM QS-TWO is anything but slim. On the contrary, it drives loudspeaker systems with 4, 3 or 2 Ω impedance without difficulty and remains very stable even under critical loads. With a mono bridge output of 190 watts RMS at 4 Ω, it can also elicit a lot of bass from subwoofers. Incidentally, it impresses with its high-end sound: thanks to the huge bandwidth of up to 60,000 Hz and a sensationally low distortion factor of <0.007% (THD + N @ 5W), the QS-TWO is way ahead.

ESX masters the construction of Class D power amplifiers so well that the QS-TWO can come up with a sensational efficiency of up to 90% and EMC interference-free. The modern technology saves electricity, relieves the vehicle's electrical system and protects the high-quality components from overheating. Thanks to the high degree of efficiency, no thick power cables need to be pulled. If you want it to be very easy, you can use the QS-TWO-ISO, which can be supplied via a pre-assembled ISO cable harness, e.g. can be connected behind the car radio.

  • 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
  • RCA Inputs (via Molex)
  • Stereo RCA Output for e.g. active Subwoofers
  • HPF/LPF switchable
  • Perfect for HD-Audio

Specifications

  • 4-Channel Class D Plug+Play Nano Digital Amplifier
  • 4 x 35/45/60 Watts RMS @ 4/3/2 Ω
  • 2 x 120 Watts RMS @ 4 Ω bridged
  • 2 x HPF/LPF @ 80 Hz
  • THD+N @ 5W/RMS < 0,007%
  • Frequency Range 10 Hz - 60 kHz
  • Dimensions 90 x 35 x 80 mm
  • Efficiency up to 90%
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: 99576356813

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S1
Lake Worth, US
★★★★★ 5
Built tough for puppies
Size: Medium, Style: Medium (4 Pack)
These are great, the bright color stands out in grass outdoors they bounce well on hard floors indoors, and they’ve held up well even after a couple weeks of a very chew happy puppy playing with them.
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Reviewed in the United States on May 26, 2026
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Michael L. Howeth
Phoenix, US
★★★★★ 5
Best ball for retrieving ever
Size: Medium, Style: Medium (4 Pack)
I have been using a ball launcher to exercise my Border Collie. Up till now I have been using the launcher to throw tennis balls. Even with the launcher I can only throw the balls a couple of hundred feet. These balls go MUCH further. I am using a steep horse pasture to throw the balls and I have to make sure that I don't launch them past the fence at the end of the pasture. I think the thing that makes them go further is their weight combined with a smooth surface. They also have incredible bonce. They hit and just shoot way up into the air. Also, the tennis balls I was using were green. In my horse pasture they were easy for the Collie to miss since they blended right in to the grass. These balls with the orange with blue stripes are far easier for the dog to find. It's really hard to tire out a Border Collie but these balls do the job.
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Reviewed in the United States on January 15, 2026
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Carla
Carnegie, US
★★★★★ 5
Great fun for retrievers
Size: Medium, Style: Medium (4 Pack)
Great durable balls. Use these with or without the thrower. Lab puppy loves to play fetch and these are easy to spot in the yard. Our neighbor has 2 pit bulls who also plays with them. Will buy them again if need be.
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Reviewed in the United States on May 27, 2026
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Barbara
Battle Creek, US
★★★★★ 5
Dogs love them
Size: Medium, Style: Medium (4 Pack)
These balls last! Dogs love them!
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Reviewed in the United States on April 27, 2026
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Verucat
West Palm Beach, US
★★★★★ 5
Yes!
Size: Medium
Durable. Squeak doesn't last forever with my aggressive chewers but crinkle does. Best balls.
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Reviewed in the United States on September 28, 2025

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