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BMW 3-Series (E90 E92) Forum
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E90 Front speaker wiring resistances
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| 06-08-2018, 03:43 PM | #1 |
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E90 Front speaker wiring resistances
Hi all,
New to the forum. I have a question relating to the wiring for the front speakers on the E90. If i have it right, the front door speakers and the underseat subwoofers are wired in parallel. Electronics was never my strong point, but if i understand the maths correctly that means that a head unit supplying say 50W of power will be delivering 25W to each speaker. Would it be correct that if you bridged out the wiring for the underseat woofers then you would be delivering the full 50W power to just the door speakers? I've upgraded to the Eonon GA9165A and put in both the Focal IBMW-S and SUBs butthey are still lacking in low end punch and power from the door speakers. Rather than reamping both the subs and the door speakers, am i right in the resistance and power over a parallel configuration? Cheers in advance! |
| 06-08-2018, 10:07 PM | #2 |
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If you started out with the base system no amplifier in the trunk
you are correct the front doors and floors are wired in parallel. BMW stereo types http://www.e90post.com/forums/showthread.php?t=352586 http://www.e90post.com/forums/attach...2&d=1266451970 http://www.e90post.com/forums/attach...2&d=1260829447 http://www.e90post.com/forums/showthread.php?t=343673 http://www.e90post.com/forums/showthread.php?t=138949 http://www.e90post.com/forums/attach...1&d=1209780605 http://www.e90post.com/forums/attach...1&d=1209780865 http://www.e90post.com/forums/showthread.php?t=641323 http://bmwcoders.com/forum/3-er-8/bm...1-e92-e93-291/ http://technicpnp.com/menuDiagrams/d...e90_92_93.html http://www.musicarnw.com/page-2/ http://www.e90post.com/forums/attach...3&d=1169133185 http://www.e90post.com/forums/attach...4&d=1278871872 Last edited by ctuna; 06-08-2018 at 10:16 PM.. |
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| 06-09-2018, 05:10 AM | #3 |
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Thanks for all the info ctuna :-)
Yes it did start with the base system. I have already swapped both underseat 6 inch stock subs for the Focal IFBMW-SUBS, and removed the door cards and swapped the single door mids for the Focal IFBMW-S speaker and tweeter packs. They are still using the stock wiring harness, but the HU has been replaced with the Eonon GA9165A. From a technical perspective: The HU outputs 45W to each of the 4 output channels (LF door and floor, RF door and floor, LR shelf and RR shelf). Because the fronts are in parallel they are sharing 1/2 of the output power to each branch of the wiring. If you were to remove the sub from the wiring connector and bridge it out so it effectively then becomes a parallel loop with doors being a 4 Ohm load and the Sub having no load - would the door speaker loop receive the full 45W HU output? |
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