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Discussion Starter · #1 ·
Some background info.....
Newly install system in a 2018 M3 with H/K system
Had a local shop do the remove and replace/sans the headunit (needed it to be Plug and Play for a lease)
Audison Bit-DMI
Audison F8.9 AMP/DSP
3 sets of Focal BMW IS-100
CH 1-2Front Dr,
CH 3-4Rear Dr
CH 5-6 Rear Deck
Ch 7-8 Under seats Focal isubs-bmw-2ohm

In the trunk I have a JL Audio 12w6v3 in a wedge box powered by a JL audio 750/1 amp
Tuning is set like this on the Audison BIt Tune

Sound is better than the stock H/K system something sounds off. in the mid to low range, Ill need to learn how to take a reading using an RTA to confirm this....
Not sure why it wasn't done but does de-equalization need to be performed during tuning?
For the trunk sub i should set the x-over and eq on the Audison and leave the JL 750/1 x-over at 110 LPF 35hz subsonic or all off?
Ive had the shop retune it 2 times already, kinda frustrating.
What do you guys think of theses settings before I try this on my own..


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Without drilling down to much it seems like the Crossover settings are kind of messed up but i don't know the reasoning behind them. I would change all the Linkwitz Riley 24db. Are the passive XO's being used? It looks the tweeters are HP at 225hz? But i don't know how they are set up. Sub us CXO'd too high and there seems to be no T/A done? i could be wrong, but looking at the pictures, the show has no idea how to tune.
 

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Ok, then it appears he has it set up so all 3 sets of speakers are running passive. Its just confusing how the naming is going.

If it were me, i would change all 3 sets of speakers to HP at 24db using the LR filter and cross them all the 175hz. Tun the front speakers full range 175hz and up, but bandpass the 2 sets of speakers in the back 175hz to 8k.
Then the sun i would low pass it at 90hz again 24db using the L/R filter. And because it is a ported box the SSF shouold be on. If it is fixed at 35hz thats a bit high, but it should be on.

Then you should do the Time alignment. manually with a tape measure.

save it as a differnt setting so you don't lost what you have and see if you can tune from there.
 

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You have too much overlap between the underseat woofers being crossed at 60 and the sub at 110. When I had my M3 I ran the underseats from 80 to 200 and let the mids come in at 250. I tried to keep the top end of the underseat limited as it sounded to localizable above 209. Sub was crossed at 80. I could have crossed it at 60 but I liked that the sub reinforced the midbasses a little.
 

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Discussion Starter · #6 ·
Sorry its been a crazy week, haven't tried these suggestions yet but i will probably tomorrow. As far as the sub AMP, would there be any benifit to make the settings wide open and then on the DSP, tune(bandpass) to say 30hz-80hz?
 
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