Cheap Subwoofer Installation in Dublin: Published Prices, Inflated Watts and What the Cheapest Fit Leaves Out

“Where can I get a subwoofer fitted cheaply in Dublin?” The cheapest answer is an under-seat subwoofer bought online for about €60 and fitted yourself, or fitted by a workshop that publishes €240 to fit one you supply. A branded under-seat unit such as the Pioneer TS-WX140DA costs €194.79 before fitting. At Radio King an active under-seat subwoofer starts from €250 supply only plus installation, and our car pages show a typical under-seat job from about €500 fitted.

Prices checked on 9 October 2026. Every figure below comes from the business’s own website or listing on that date, with a link, and we compare like with like: subwoofer, amplifier, wiring and fitting. Prices change, so check before you book. How we compare is explained in our guide to cheap car electronics fitting.

The cheapest ways to get a subwoofer in Dublin

1. Buy an under-seat subwoofer online and fit it yourself. An under-seat unit advertised as “1000W” costs €59.98 on AliExpress. A Pioneer TS-WX140DA, rated “160 Watt”, is €194.79 on Amazon (prices seen on 9 October 2026). Both come from outside the EU, so import VAT is added, along with a €3 customs duty per item on parcels worth €150 or less unless the goods were made in the UK. Returning a faulty box is your problem.

2. Buy online, pay a workshop to fit it. Radio Masters publishes €240 to fit a customer-supplied subwoofer, and €240 for a 1–2 way amplifier or €280 for a 3–5 way. You pay for the parts separately and the warranty on them stays with the seller.

3. A fitting chain. Halfords Ireland lists audio fitting for stereos and speakers, but we found no subwoofer fitting service listed. We found no published electronics fitting prices from other chains.

4. A specialist, supplied and fitted. At Radio King an active or under-seat subwoofer starts from €250 supply only plus installation, and a passive subwoofer with an amplifier from €450 supply only plus installation. On our car pages a compact under-seat or boot subwoofer on a DSP amplifier, fed from the factory radio and tuned in the car, starts from about €500 fitted.

Why a €60 box claims 1000 watts

The €59.98 unit says “1000W”. The Pioneer costs far more and says “160 Watt”. The bigger number does not mean more bass. Wattage on cheap car audio is usually a peak or “max” figure measured to no common standard. Continuous (RMS) power is what an amplifier can actually sustain, and on an under-seat box it is far below the headline. A real 1000 watts from a 12-volt car would need a power cable about as thick as a battery lead and a fuse to match, and nothing in a cheap under-seat kit is built for that. Compare continuous power, driver and box size, and listen before you trust the label.

What the cheap price usually leaves out

A subwoofer is the one car audio upgrade that draws real current from the battery. Most of what goes wrong is on the power side, not the speaker side.

• Cable size and a fuse at the battery. The power cable has to be thick enough for the current, with an in-line fuse close to the battery. The NCT manual lists after-market items “not being wired through ignition switch or a fuse” as a major defect (4.11(g)), and “unsuitable wiring… e.g. household wiring/bell wiring” as another (4.11(h)).
• The bulkhead. The cable passes from the engine bay into the cabin through the bulkhead. It should go through an existing rubber grommet. Pushed through a bare hole, it chafes until the insulation goes, and damaged insulation with an “imminent risk of fire” is a dangerous defect (4.11(j)).
• A good earth. The earth is half the circuit: a short cable to clean, bare metal. Bolted to paint or a loose fixing, it gives a whine through the speakers and an amplifier that cuts out on bass notes.
• The signal from a factory radio. Most factory radios have no subwoofer output. The signal has to come from the speaker wires through a line-output converter, or on newer cars through a DSP that also corrects the factory sound settings. Done cheaply, the tap picks up hum, or the bass fades as you turn the volume up, because some factory radios cut bass at high volume.
• The gain. The gain knob matches the amplifier to the incoming signal; it is not a volume control. Turned up to the end, the amplifier clips, the bass turns harsh and the voice coil overheats. It is set with a test tone, not by ear.
• The remote wire. An amplifier switches on from a thin remote wire. Put it on a permanent live and the amplifier never switches off, and it slowly flattens the battery while the car is parked.
• Under the seat. The front seats carry wiring for airbags and belt sensors and slide on rails. The box and its cables must clear both through the full travel of the seat.
• Who stands behind it. Under the Consumer Rights Act 2022, when one business sells and fits the subwoofer, a bad installation counts as a fault with the goods. Buy outside the EU and the CCPC warns you have fewer protections and no small claims process.

Buy cheap, buy twice: the real cost

With a subwoofer it pays to have a professional do the job once rather than pay for the same job twice, because the second job usually starts by pulling out the first one’s wiring.

Example: under-seat subwoofer	Route A: cheapest	Route B: done once
Subwoofer	Online “1000W” unit, €59.98 plus import charges	Supplied with the job
Fitting	Yourself, or labour only at a published €240	Included
Power wiring	The cable in the box, no fuse at the battery	Cable sized for the load, fuse, grommet, clean earth
What goes wrong	Weak bass, a whine, a flat battery or an NCT defect	Covered by warranty
Second job	Under-seat subwoofer fitted properly, from about €500	Not needed
Total	about €560 to €800 plus import charges	from about €500

This is an example, not a promise. A cheap box wired properly can do its job, and our fitted price depends on the car. The waste comes when the first install has to be undone before the second one can start.

When the cheap option is perfectly fine

• Your car already has an aftermarket head unit with a subwoofer output.
• You want a little more low end in an older car, not a boot full of bass.
• You are confident with power wiring and buy a proper wiring kit with a fuse holder.
• You already own a good active under-seat unit and only need it fitted.

Whoever fits it, ask where the fuse goes and where the earth goes. If the answers are “near the battery” and “bare metal”, you are getting a job done properly.

Price comparison

Route	Price as published	Includes	Warranty	Source, checked 9 Oct 2026
Online under-seat unit, fit yourself	€59.98 (“1000W”) to €194.79 (Pioneer, “160 Watt”) plus import charges	Subwoofer only	Seller’s terms, outside the EU	AliExpress, Amazon
Labour only, your parts	€240 subwoofer; €240 or €280 amplifier	Fitting	One year on installations	Radio Masters
Fitting chain	No subwoofer fitting service listed	—	—	Halfords Ireland
Radio King, supply	from €250 active or under-seat; from €450 passive with amplifier	Subwoofer (with amplifier for passive); installation extra	One year	Subwoofer installation
Radio King, fitted	from about €500 on our car pages	Under-seat or boot subwoofer, DSP amplifier, wiring, tuning	One year	Subwoofer installation

What you get at Radio King

We have been fitting car electronics at our Dublin workshop since 2016, on more than 32,000 cars so far. An active under-seat subwoofer from €250 supply only plus installation, a passive subwoofer with an amplifier from €450 supply only plus installation, and on our car pages a typical under-seat job from about €500 fitted. We confirm the exact price from your registration. The power cable is sized for the load and fused at the battery, it enters the cabin through a grommet, the earth goes to clean metal, the remote wire switches with the car, and the gain is set with a test tone. On factory radios the signal comes through a line-output converter or a DSP, the subwoofer is tuned in the car, and the boot stays usable. The work carries a one-year warranty.

Send your registration on WhatsApp and we tell you which subwoofer fits your car and the exact price. The subwoofer installation page covers active, passive and boot options.

If the door speakers are tired too, start with cheap car speakers fitting in Dublin; bass and speakers work best together. For the rest of the series, see the cheap car electronics fitting guide.