07-13-2023, 04:54 AM | #1 |
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2022 G21 330e subwoofer install
Haven’t seen any of these, so hopefully I’ll get it right. I salvaged my JL Audio sub, amp and LC2i from my previous car and will attempt to install in my ”new” G21. Just realized there are two 12V batteries: one under the trunk and one on the right hand side. Guessing the best option is to connect to the right hand battery. I have the Harman Kardon sound system, so will tap into the booster harness for the signal. Not sure about the wires. There is a black/white, blue/gray, black/green and a yellow/purple. Anyone know which is which? (L+, L-, R+, R-) Would rather not have to dismount the seats to trace to the underseat woofers. I will use the ground point in the left side bay. Finally, I will need to find a suitable remote signal in the right hand side fuse box. Any tips on which one to use?
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07-14-2023, 06:01 AM | #2 |
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Watching a Bimmertech under seat sub replacement video I have confirmed that the black/white and blue/gray are the right side sub wires. How to determine polarity without access to the speaker?
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lolamorena3.00 |
07-17-2023, 11:12 AM | #3 |
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No replies despite 100 views. Guess I am on my own. Oh well, I’ll keep posting, maybe it will help someone else.
Removed the seats to verify the pairs. Driver side sub wires are now confirmed as black/green and purple/yellow, passenger side blue/gray and white/black. Still unclear which is + and -, but at least they will be in phase. Guess I will have to try both ways and see which sounds best. |
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dhock_holiday210.50 |
07-18-2023, 10:19 PM | #5 |
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Multimeter and lowest voltage setting. Positive will yield + voltage and if u have it reverse it will be - negative values
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08-13-2023, 08:46 AM | #6 |
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I have now Finished the install using a custom made harness, an Audio Control LC2i converter, a JL Audio JX250/1 amp and a JL Audio CP108LG sub. My assumptions about the wires above were correct. The bass improvement is fantastic. I now have solid and clear bass at all volume levels. I will now code in the B&W DSP profiles and see what the HK system is ultimately capable of.
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08-15-2023, 12:29 PM | #7 |
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Coded the Bowers & Wilkins profiles into my HK system. The Concert and Stage profiles together with my new sub and some eq tweaking sound fantastic!
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lolamorena3.00 |
09-20-2023, 05:05 AM | #8 | |
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09-25-2023, 03:00 PM | #9 |
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No, there is no battery under the hood. There is one in the right side of the trunk, one under the trunk floor.
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lolamorena3.00 |
09-27-2023, 03:57 PM | #10 |
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01-13-2024, 10:53 PM | #12 | |
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Drives: 2020 BMW m340i xDrive (Alpine)
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