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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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

🎚️Sub frequency control

$123.13

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Description

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

PLUG PLAY READY - Complete package with power supply and manual—upgrade your home theater instantly.
POWERFUL 100 W OUTPUT - Drive your passive subwoofer with crystal-clear, room-shaking bass.
DUAL MODE FLEXIBILITY - Switch effortlessly between subwoofer bass boost and full-frequency mono amp modes.
PRECISION BASS CONTROL - Fine-tune your low-end with an integrated low pass filter and sub frequency adjustment.
COMPACT ROBUST DESIGN - Sleek mini amp fits anywhere, built tough to last and stay cool under pressure.

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 modes for optimized bass or full-range output, integrated low pass filtering, and precise sub frequency control. Designed for passive subwoofers and speakers, it’s a robust, space-saving solution that enhances home theater audio with deep, crisp low frequencies—all backed by an 18-month warranty.

Specifications

ASIN	B07942M4MC
Best Sellers Rank	#14,467 in Electronics ( See Top 100 in Electronics ) #68 in Audio Component Amplifiers
Brand Name	Fosi Audio
Customer Reviews	4.4 out of 5 stars 532 Reviews
Included Components	Fosi Audio M04
Item Dimensions	5.2 x 3.5 x 1.4 inches
Item Weight	450 Grams
Item dimensions L x W x H	5.2 x 3.5 x 1.4 inches
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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$123.13

Duties & taxes included

In stock

Sold byAmazon USADelivered 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 USA.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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