Why does the amplifier shut itself off?

Often built-in overheat protection triggering from inadequate cooling, or a short circuit in the speaker wiring.

Is a fault here a safety issue?

No, it’s not critical to safety, just sound quality.

What does this unit consist of?

Electronic power transistors, a cooling heatsink, and connectors.

What is this part and what does it do?

Full description available in the product description section above. Contact us with clarifying questions.

How do I tell if my part is faulty?

See the 'Signs of a faulty part' section above or run a diagnostic at an auto service.

Yes - all our used parts are tested before sale and sold with guaranteed quality.

When should the part be replaced?

When warning signals appear, diagnostic codes are present, or the system malfunctions.

Audio amplifier unit for VOLVO S40 2004 Grey

Name: Audio amplifier unit for VOLVO S40 2004 Grey
Brand: VOLVO
SKU: 30732486
Price: 36.00 EUR
Availability: InStock

OEM: 30732486

Disassembled car photo

Engine running

Tested before shipping
Guaranteed quality
Fast delivery 3–7 days
14-day returns

What is this part and why does it matter?

This audio amplifier unit boosts the audio signal’s power before it reaches the speakers, giving cleaner, louder sound.

Ask a question

Not sure about compatibility? Send us your car's VIN and we'll confirm.

Ask about this product

Signs of a faulty part

If you notice any of the following, the part likely needs replacement:

No sound anywhere in the system even though the radio works fine
Distortion or crackling at high volume
The amplifier shuts itself off (overheat protection)

Installation information

Mounts in the boot or under a seat, needs connecting to the radio, speakers and power supply with a solid earth connection.

Donor vehicle description

VIN: YV1MS753152063690
Make, model: VOLVO S40 (04-)
Year: 2005
Engine: Dizelis 2.0L 100KW D4204T
Transmission: 6-pārnesumu Mehāniska - MMT6
Drive: 2WD
: Stūre kreisajā pusē
Colour: TITANIUM GRAY PEARL 45500

90 parts from this car

Frequently asked questions

A radio’s built-in amplifier is usually low-powered — a separate external amplifier gives significantly cleaner sound at high volume and lets premium speakers perform properly.

What our customers say

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Price: affordable. Service: electrical equipment repair.
A
Andris B.
September 2026
Price: excellent.
D
Didier V.
August 2026
Super good! They came through with the part I needed, quickly and at a fair price! Thanks, and I definitely recommend!
I
Ilmars K.
August 2026
I ordered a Heater Blower Motor Resistor for a Toyota Avensis. Delivery took eight days from Latvia to Ireland. I installed it, and everything works perfectly. I wish this company success.
A
Aleksandr L.
Toyota Avensis
August 2026
No complaints about Evro Trans itself, everything's fine. But the delivery..... It felt like the order was being carried by turtles. 4 days from Riga to Daugavpils. Judging by the tracking, the parcel just sat somewhere behind a shed for 3 days, then they found it and delivered it the next day. I think that's why I won't be ordering there again.
P
Paul F.
June 2026
Super fast delivery of the part, and good quality of the used part. Thanks for the service.
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Natālija I.
May 2026
I ordered antifreeze heaters and an auxiliary pump. Everything arrived quickly, the very next day, and matched the description. I'm satisfied.
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Juris J.
February 2026
Excellent service, timely delivery, and complete transparency at every step. I highly recommend EvroTrans to anyone looking for a reliable partner!
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Egor S.
November 2025
Bought a front fender for my car. I liked it! After payment they sent more than 20 photos of the problem areas, and it was packed very securely - took a while to unwrap.
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Igors K.
Front fender
October 2025