SKU: 55289900912

Esx Quantum Digital 4Ch Amp Qe900.4

Sale price$173.25 Regular price$192.50
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Ships within 48 hours · Estimated delivery Aug 7 - Aug 12

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Description

Esx Quantum Digital 4Ch Amp Qe900.4High Performance 4 Channel Class D Amplifier with Bridgeable Option Power Output: 4 x 150 Watts RMS @ 4 Ohms 4 x 225 Watts RMS @ 2 Ohms 2 x 450 Watts RMS @ 4 Ohms (Bridged) Amplifier Type: Class D Features: Highpass Filter CH1 2: 50 5000 Hz Highpass Filter CH3 4: 10 500 Hz Lowpass Filter CH3 4: 50 5000 Hz Bandpass Mode Bass Boost: 12 dB @ 40 Hz Copy Mode (CH3 4 > CH1 2) Line Outputs 2 4 CH Input Mode Included Bass Remote Start Stop Ready High Level

High-Performance 4-Channel Class-D Amplifier with Bridgeable Option

Power Output:

  • 4 x 150 Watts RMS @ 4 Ohms
  • 4 x 225 Watts RMS @ 2 Ohms
  • 2 x 450 Watts RMS @ 4 Ohms (Bridged)

Amplifier Type: Class-D

Features:

  • Highpass Filter CH1/2: 50 - 5000 Hz
  • Highpass Filter CH3/4: 10 - 500 Hz
  • Lowpass Filter CH3/4: 50 - 5000 Hz
  • Bandpass-Mode
  • Bass-Boost: 12 dB @ 40 Hz
  • Copy-Mode (CH3/4 > CH1/2)
  • Line-Outputs
  • 2/4 CH Input Mode
  • Included Bass-Remote
  • Start/Stop Ready
  • High Level Inputs with EPS
  • Auto-Turn-On
  • Efficiency: 84%

Elevate your car audio experience with our high-performance 4-channel Class-D amplifier. This powerhouse delivers 150 Watts RMS at 4 Ohms and 225 Watts RMS at 2 Ohms for each channel, providing exceptional sound quality. When bridged, it produces an impressive 450 Watts RMS at 4 Ohms, making it perfect for those seeking even more power.

The amplifier offers versatile filtering options with highpass filters for CH1/2 ranging from 50 to 5000 Hz, and for CH3/4 from 10 to 500 Hz. Additionally, there is a lowpass filter for CH3/4 with a frequency range of 50 to 5000 Hz, and a bandpass-mode for precise sound customization.

You can enhance the bass performance with the 12 dB boost at 40 Hz, and with the copy-mode functionality, the audio signals from CH3/4 can be copied and routed to CH1/2, expanding the configuration possibilities.

Featuring line-outputs and 2/4 CH input mode, the amplifier allows you to connect various audio components seamlessly. The included bass-remote provides convenient control over the bass levels, while the Start/Stop ready feature adds to the user-friendly experience.

The amplifier is equipped with high level inputs with EPS (Easy Power Supply) and Auto-Turn-On functionality, ensuring hassle-free integration into your car audio setup. With an efficiency rating of 84%, this Class-D amplifier maximizes power utilization while delivering exceptional performance.

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: 55289900912

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4.4 ★★★★★
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Lais
Louisville, US
★★★★★ 5
The Ultimate Natural Latex Pillow
Color: Soft, Size: Standard(24"×16"×5.5")
I recently switched to the Talatex 100% Natural Premium Latex Pillow and it has transformed my sleep. Unlike synthetic memory foam, this Purefusion Talalay Latex is incredibly supportive yet soft, providing excellent pressure relief for both my neck and shoulders. I appreciate knowing there are no harsh chemicals in the core.  It retains its shape perfectly night after night and stays cool thanks to the breathable material. The quality is immediately apparent, especially with the removable Tencel cover, which is luxuriously smooth. It arrived in a beautiful package, truly making it the best gift for anyone seeking a healthier, more comfortable night's sleep. Highly recommended!
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Reviewed in the United States on October 28, 2025
A
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Aisha Yousaf
San Leandro, US
★★★★★ 5
The Natural Way to Better Sleep.
Color: Soft, Size: Standard(24"×16"×5.5"), Color: Soft, Size: Standard(24"×16"×5.5")
After trying out several latex over the years, the Talatex Talalay 100 stands out for its luxurious comfort, quality materials, and overall sleep experience. Made from 100% natural Talalay latex, it offers a perfect balance of softness and support. Comfort & Support: The Talalay latex feels incredibly buoyant yet plush. I found it especially beneficial for relieving neck pain. Temperature Regulation: One of the best aspects is its breathability. Latex naturally sleeps cooler than other foams. Eco-Friendliness: Another big plus is that it’s made from natural latex with no synthetic additives, making it a healthier and more environmentally friendly choice. It’s also hypoallergenic, which is great for allergy sufferers. Verdict: If you're looking for a premium latex sleep surface that delivers both comfort and longevity, the Talatex Talalay 100 is a solid investment. It’s not the cheapest option out there, but the quality and sleep experience justify the price.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 14, 2025
K
Verified Purchase
KJ
Dallas, US
★★★★★ 5
Finally sleeping well again
Color: Soft, Size: Standard(24"×16"×5.5"), Color: Soft, Size: Standard(24"×16"×5.5")
Got the standard soft and the height is just right - perfect mix of plush and supportive. My neck pain is basically gone. Love that it stays cool through the night thanks to the little vent holes, and the Tencel cover feels super soft. Holds its shape really well too, no flattening. Packaging felt like a gift. Worth every penny.
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Reviewed in the United States on April 24, 2026
L
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Lulu in TX
Boise, US
★★★★★ 5
Cool-temperature outer cover
Set name: UltraCool Pillow 2-Pack, King - Soft/Medium, Item length width: 40.0 Inches
The pillows (set of2) are easily fluffed and adjusted to personal desire. The outer cover is cool to the touch. I do not feel "cooler" with the pillow, but it does not get hot like some. I'm a side sleeper and sleep comfortably with the Slumber Cloud. I would buy these again. Con: pillow cover is slick, so pillow cases slide off.
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Reviewed in the United States on January 10, 2026
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Happy Shopper
Belleville, US
★★★★★ 1
not cooling for post menopause
Set name: UltraCool Pillow, Standard - Medium/Firm Firmness, Item length width: 30.0 Inches
As a post menopausal person I did not find this cooling at all. The material is memory foam which holds heat but more importantly my head sinks in so that half of it is always surrounded by the pillow, trapping heat. It IS a supportive, soft and comfy pillow. For cooling though, I found it better to buy a firmer, thinner pillow which keeps my head from sinking into it, allowing heat to dissipate.
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Reviewed in the United States on August 25, 2025

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