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Description
Quantum Audio QPX2800.4 4-Channel 1440W RMS QEA Series Class A/B AmplifierQPX2800. 4 4 Channel Stereo Amplifier 3600 Watts FEATURES: Class A B Circuitry 2 Ohm Load Stereo Capability Amber Glow Logo Badge Audiophile Grade Components Speaker Short Circuit Protection High Efficiency Mosfet Design 12 dB Variable High Pass and Low Pass X over Selectable: 0, 6, 12 dB Octive Bass Boost Buffered Line Output for Easy Daisy Chaning SPECIFICATIONS: Dynamic Power : 3600 Watts 4 x 180 Watts @ 4 Ohm Stereo 4 x 360 Watts @ 2 Ohm Stereo 2
- QPX2800.4 4 Channel Stereo Amplifier / 3600 Watts
- Class A/B Circuitry
- 2 Ohm Load Stereo Capability
- Amber-Glow Logo Badge
- Audiophile Grade Components
- Speaker Short Circuit Protection
- High Efficiency Mosfet Design
- 12 dB Variable High Pass and Low Pass X-over
- Selectable: 0, 6, 12 dB/ Octive Bass Boost
- Buffered Line Output for Easy Daisy-Chaning
- Dynamic Power : 3600 Watts
- 4 x 180 Watts @ 4 Ohm Stereo
- 4 x 360 Watts @ 2 Ohm Stereo
- 2 x 600 Watts @ 4 Ohm Bridged
- Ch 1-2 High Pass Crossover: 60Hz-1.2KHz
- Ch 3-4 High pass Crossover: 60Hz-1.2KHz
- Ch 3-4 Low pass Crossover: 50Hz – 400Hz
- X-Over Slope: 12dB
- Bass Boost @ 45Hz: 0-12dB
- Input Sensitivity: 285Mv – 6V
- Signal to Noise Ration >90dB
- THD at 1%: <0.1%
- Length: 13.7” / 348mm
- Width: 8.6” / 220mm
- Height: 1.96” / 50mm
FEATURES:
SPECIFICATIONS:
DIMENSIONS:
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
4.3 ★★★★★
Based on 1567 reviews
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Product Reviews
★★★★★ 4
Fresh Air Upgrade for My 2024 Impreza
Installed this in my 2024 Subaru Impreza, and it fit perfectly—no issues. The air smells noticeably cleaner now, and it took less than 10 minutes to swap out. The carbon and HEPA filtration does a great job clearing out odors, dust, and pollen—definitely an upgrade over the factory filter.
The build feels sturdier than the OEM version, though it does have slightly fewer pleats. Might mean it needs replacing a bit sooner, but for the price and performance, I’m fine with that tradeoff.
If you’re looking for a quick, affordable way to improve your cabin air, this one’s a solid pick.
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Reviewed in the United States on June 26, 2025
★★★★★ 5
Well built, good fit.
I like it so well, I just bought two more to keep on the shelf for when the price doubles. Seems better built than oem, but I don't know how you can judge the filtration; seems good though.
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Reviewed in the United States on May 6, 2026
★★★★★ 5
Great product
Perfect fit for 21 Cross Trek
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Reviewed in the United States on February 12, 2026
★★★★★ 5
Good fit, good value
Style: CF12436 Classic, Style: CF12436 Classic
Purchased this filter for my 2023 Outback. First off changing the cabin filter on this model Subaru is amazingly easy and can be done with no tools and no more then 5 minutes. Pictures posted show packaging, the paper "Blue" filter side, the "Black" charcoal side and the foam outer edge. The filter is well made and is very sturdy as the outer shell is plastic vs. other paper filters that are more flexible. Holding the filter in your hand and giving it a slite shake you can hear the activated charcoal within it. After installing the filter I had a few trips in the car, did I notice any difference in the air quality coming into the cabin....... no. But does this mean its not working? also no. What I can say is the filter fit snug and left no gaps, and with the plastic surroundings and foam in sure the filter will not be letting anything get by as it passes through the system. All and all this filter is well made and sturdy, and seems to be a good value with other paper only filters being about the same price.
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Reviewed in the United States on May 4, 2026
★★★★★ 5
Perfect Fit and Great Quality
Style: CF12552 Classic
The thickness is just right and fits perfectly. Easy to install, good airflow, and the air feels much cleaner after replacing the old filter. Great value for the price.
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Reviewed in the United States on May 22, 2026
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