[arjvnv]

Hello, I am currently planning on adding a trunk sub to my Logic7 e90. Main goal is SQ, wanted to know if a 10” or 12” Image Dynamics IDQ would be better.
As well as when ordering the Technic Harness for it, how do I know which Top-HiFi my system is? Thank you.
I am currently planning on ordering a Visual Ice enclosure on eBay, so wanted to know if there’s any better options as well.

[KClemente]

Logic 7 is option 677 on e90's

[arjvnv]

KClemente Sounds good, just ordered. Would you say for subs 10 or 12s would be better

[arjvnv]

ctuna Tried to pm but won’t let me. Would you recommend 10” or 12” subs, IDQ D4.V4?

[ctuna]

I don't believe in subs. I see no need for them in balanced system .
I am very old school . Seems like a lot of people now think subs are the
cure for everything . They are not when you add a sub you get the system
you had plus a sub. And usually in BMW the sub will overwhelm that system.
I prefer open discussions on this forum to personnel communications with
most people. No Rap no Dub Step sorry stuck in the 60's and the 70's and
will remain there except for a few exceptions , that maybe approximate and
add to that period.

[tankertoad]

Originally Posted by arjvnv

ctuna Tried to pm but won’t let me. Would you recommend 10” or 12” subs, IDQ D4.V4?

Originally Posted by ctuna

I don't believe in subs. I see no need for them in balanced system .
I am very old school . Seems like a lot of people now think subs are the
cure for everything . They are not when you add a sub you get the system
you had plus a sub. And usually in BMW the sub will overwhelm that system.
I prefer open discussions on this forum to personnel communications with
most people. No Rap no Dub Step sorry stuck in the 60's and the 70's and
will remain there except for a few exceptions , that maybe approximate and
add to that period.

As someone who has a professionally tuned system with an audiophile 8” sub in a custom enclosure and the ability to dial down the sub, I can tell you it absolutely makes a difference on the upright bass accompanying Patricia Barber. Whether the cost of the driver, box, and additional channels of amplification is worth that extra “somethin’” that makes the music come alive is up to the individual, but it most certainly can be heard and felt.

[ctuna]

But you didn't just add a sub . Also there are 8's under the seat that don't depend
as much on the body of the car for sound conduction for a good part of there range.
And a lot of people put subs in as a fashion statement.

And you can only tune the stock system so much .
If you ever looked at the specs on the stock system's
There rated power is at 10 percent distortion.

https://www.e90post.com/forums/showthread.php?t=1144129

output chip specs for L7 in the above link.

[tankertoad]

Sure, if one is cobbling together an amp/sub on top of an OEM setup, it will add thump but not be very musical. A sub has its place but it’s not a cure-all. A more likely superior solution is to add a multichannel DSP amp and tune the OEM gear. It won’t win any awards, but it would get the most out of the rest.