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+--- Thread: Retrofit Subwoofer on High Performance w/o Subwoofer (/showthread.php?tid=350)
RE: Retrofit Subwoofer on High Performance w/o Subwoofer - Sodertalje - 09-24-2025
(09-24-2025, 06:08 AM)thermal-fixity Wrote: A few questions:
1. Anyone tried swapping a high performance amp with a B&W? Any significant improvement in the sound quality?
2. Would you recommend looking for an H&K or B&W sub? I had a BMW F30 and the H&K sound was kind of meh…
3. Do you have part number for the subs? Wondering if a sub from other models wold fit an XC90
4. Did you have to install different trim panels in the trunk?
1. Yes. Small improvement if you keep the HK speakers and major improvement if you exchange HK speakers for B&W speakers.
2. I would use a B&W sub with the B&W Amp.
3. Sorry, no part number.
4. I don't think so.
RE: Retrofit Subwoofer on High Performance w/o Subwoofer - Kenn - 09-24-2025
1. I have not but there are detailed threads here and on swede speed forum.
2. It depends on your system. I run high performance and went for the HK sub 4 ohms impedance. Without extra amplifier the sound was a bit meh. Adding a designated amp in the trunk made the sound picture complete. The sub with amp makes the difference. I tried to activate 210 02 with subwoofer but nothing happened. No power on pin 8/16 or 6/14 (wich are my free pins in my green plug of my 5 fin amplifier).
3. See 1
4. No, it's a plugnplay job. I had no speaker cable pre installed so I ran the front woofer signals to my aftermarket amp and from there to the subwoofer. Only space I lost was a square in the trunk were the non existing spare should be. 30x20x5cm. You don't see anything of the installation without lifting the trunk lid.
RE: Retrofit Subwoofer on High Performance w/o Subwoofer - Hannu - 09-30-2025
(09-20-2025, 04:05 PM)Hannu Wrote: Thank you, output scheme helped me. Pin 3/11 and 4/12 are for front woofer.
My amp has hi level on option so no need for rem.
Everything is now ready, but subwoofer seems to be broken. I have to send it back to dealer. There is no impedance at all when testing element with voltmeter / impedancemeter. Also tried give power from 9v battery to sub but nothing happened.
Have to wait week or two to get new sub.
I got new sub yesterday and now it works perfectly
RE: Retrofit Subwoofer on High Performance w/o Subwoofer - thermal-fixity - 10-03-2025
I've ordered a B&W sub. Fortunately, the seller also had the wiring plugs from the B&W set. Decided the full B&W system is a bit pricey - will consider it later if one pops up for a good price.
How did you run the wire from the AUD to the sub? Is there a factory diagram or something?
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RE: Retrofit Subwoofer on High Performance w/o Subwoofer - IMAY2023 - 10-03-2025
(10-03-2025, 05:56 PM)thermal-fixity Wrote: I've ordered a B&W sub. Fortunately, the seller also had the wiring plugs from the B&W set. Decided the full B&W system is a bit pricey - will consider it later if one pops up for a good price.
How did you run the wire from the AUD to the sub? Is there a factory diagram or something?
3226602632266026
I have B&W AUD gen1 from 90 series for sale. if interested let me know.
RE: Retrofit Subwoofer on High Performance w/o Subwoofer - Hannu - 10-10-2025
(10-03-2025, 05:56 PM)thermal-fixity Wrote: I've ordered a B&W sub. Fortunately, the seller also had the wiring plugs from the B&W set. Decided the full B&W system is a bit pricey - will consider it later if one pops up for a good price.
How did you run the wire from the AUD to the sub? Is there a factory diagram or something?
3226602632266026
I pulled wire under floor carpet and under back seat to trunk. It was pretty easy way and it is completely unvisible.
I didn't have any wiring diagram so I don't know Is there some better way to do it.