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

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
Minimum Supply Voltage
19
Voltage
12

🔊100W output power

🧊Cool-running Class D tech

🎚️Adjustable low-pass filter

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Description

🎵 Elevate your bass game with power and precision — don’t let your subwoofer miss out!

COMPACT COOL - Sleek mini design with efficient Class D amplification keeps it cool and discreet.
PLUG PLAY UPGRADE - Breathe new life into old passive subs without the hassle of buying new powered units.
POWERFUL 100 W OUTPUT - Drive your passive subwoofer with clean, punchy bass that fills your space.
PRECISION BASS CONTROL - Fine-tune your low frequencies effortlessly with the dedicated low-pass filter knob.
VERSATILE MONO CHANNEL - Switch between subwoofer and full-frequency modes to match your audio setup perfectly.

The Fosi Audio M04 is a compact, high-performance mono subwoofer amplifier delivering 100 watts of clean power via a Texas Instruments TPA3116 chip and NE5532 op-amp. Featuring a user-friendly low-pass filter and sub frequency control, it enhances bass response for passive subwoofers with minimal heat output thanks to efficient Class D technology. Ideal for upgrading or repurposing existing passive subs, it offers professional-grade sound quality in a sleek, space-saving design.

Specifications

ASIN	B07942M4MC
Best Sellers Rank	#13,691 in Electronics ( See Top 100 in Electronics ) #57 in Audio Component Amplifiers
Brand Name	Fosi Audio
Customer Reviews	4.4 4.4 out of 5 stars (579)
Included Components	Fosi Audio M04
Item Dimensions	5.2 x 3.5 x 1.4 inches
Item Highlight	Digital Class D Integrated Power Amp for Passive Speakers Subwoofer with 19V/3.42A Power Supply
Item Weight	450 g
Manufacturer	Fosi Audio
Maximum Output Power	100 watts
Maximum Supply Voltage	19 volts_of_direct_current
Minimum Supply Voltage	19 volts_of_direct_current
Model	M04
Mounting Type	Freestanding
Number of Channels	1
Number of Items	1
Output Power	100 watts
Part Number	M04
Specification Met	[Inf] Thd <= 0.04% and Frequency Range 20hz - 120hz
Unit Count	1 Count
Voltage	12 volts_of_direct_current
Warranty Description	18-month manufacturer

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£113

Duties & taxes included

In stock

Sold byAmazon GibraltarDelivered 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 Gibraltar.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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