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 ..

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

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
Minimum Supply Voltage
19
Voltage
12

🔊100W output power

🧊Class D tech stays cool

🎚️Bass/full-frequency mode switch

¥19507

Duties & taxes included

In stock

Sold byAmazon JapanDelivered 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 Japan.

Secure transaction

Description

🎵 Elevate your bass game—small amp, massive impact!

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 - Fits anywhere with a sleek footprint and durable build that keeps 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 versatile bass/full-frequency mode switch and ultra-low distortion, it enhances passive subwoofers with deep, crisp sound. Its robust yet space-saving design includes a built-in low pass filter and sub frequency control, making it an essential upgrade for any home theater setup.

Specifications

ASIN	B07942M4MC
Best Sellers Rank	#18,602 in Electronics ( See Top 100 in Electronics ) #84 in Audio Component Amplifiers
Brand Name	Fosi Audio
Customer Reviews	4.4 4.4 out of 5 stars (549)
Included Components	Fosi Audio M04
Item Dimensions	5.2 x 3.5 x 1.4 inches
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

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

¥19507

Duties & taxes included

In stock

Sold byAmazon JapanDelivered 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 Japan.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Reema J.

Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

View all Trustpilot reviews