Will this power up passive subwoofers ?

Yes, absolutely. That's the reason I bought it and it works just fine without spending a whole lot of money.

How hot does this amp run? The unit I currently use is very hot to the touch even after a short while.

This thing seems cool no issues

What is the input voltage range?

Not sure what your question is about. If you mean input power, it's spec'd. at 12-24 vdc. It comes with a power brick rated at 19 vdc, 4.47 amps. Input sensitivity is =< 280 mv...

I have a Harman Kardon reciver with a single rca sub connection. What cables do i need to hook my sub to this amp and the amp to my reciever

You need 1/8 audio plug to RCA adapter ..

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Fosi Audio M04 Subwoofer Amplifier for Home Theater Mono Channel Digital Class D Integrated Power Amp for Passive Speakers Subwoofer

Q: I have a Harman Kardon reciver with a single rca sub connection. What cables do i need to hook my sub to this amp and the amp to my reciever

You need 1/8 audio plug to RCA adapter ..

Product ID: 58115674

Details

Item dimensions L x W x H
5.2 x 3.5 x
Manufacturer
Fosi Audio
Maximum Supply Voltage
19 Volts (DC)
Minimum Supply Voltage
19 Volts (DC)
Voltage
12 Volts (DC)

🔊100W output power

🧊Cool-running Class D tech

🎚️Bass/full-frequency mode switch

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Description

🎵 Elevate your bass game—because your home theater deserves the M04 punch!

POWERFUL 100 W OUTPUT - Drive your passive subwoofer with crystal-clear, room-shaking bass.
PREMIUM SOUND CLARITY - Experience deep, crisp lows with ultra-low distortion (THD ≤ 0.04%) for audiophile-grade performance.
DUAL MODE BASS CONTROL - Seamlessly switch between subwoofer and full-frequency mono modes for tailored sound.
COMPACT ROBUST DESIGN - Sleek mini amp fits anywhere, built tough to last and stay cool under pressure.
PLUG PLAY CONVENIENCE - Complete package with power supply and manual—upgrade your home theater instantly.

The Fosi Audio M04 is a compact, high-performance mono subwoofer amplifier delivering 100 watts of clean power via Class D technology. Featuring a Texas Instruments TPA3116 chip and NE5532 op-amp, it offers selectable bass modes and ultra-low distortion for superior sound quality. Designed for passive subwoofers, it combines robust build, efficient cooling, and easy setup, making it a top-tier choice for home theater enthusiasts seeking deep, precise bass.

Specifications

ASIN	B07942M4MC
Best Sellers Rank	#12,521 in Electronics ( See Top 100 in Electronics ) #59 in Audio Component Amplifiers
Brand Name	Fosi Audio
Customer Reviews	4.4 4.4 out of 5 stars (529)
Included Components	Fosi Audio M04
Item Dimensions	5.2 x 3.5 x 1.4 inches
Item Weight	450 Grams
Manufacturer	Fosi Audio
Maximum Supply Voltage	19 Volts (DC)
Minimum Supply Voltage	19 Volts (DC)
Model	M04
Mounting Type	Freestanding
Number of Channels	1
Output Power	100 Watts
Part Number	M04
Specification Met	[Inf] Thd <= 0.04% and Frequency Range 20hz - 120hz
Unit Count	1.0 Count
Voltage	12 Volts (DC)
Warranty Description	18-month manufacturer

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$125.56

Duties & taxes included

In stock

Sold byAmazon British Virgin IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to British Virgin Islands.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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