[spta97]

Originally Posted by Wgosma

Some add'l info/input regards subwoofers, underseat or otherwise for those interested. I believe BillFitz is a designer and/or has background in audio/speaker design technology.

(From F30 forum)
link: https://f30.bimmerpost.com/forums/sh....php?t=1706773

Thanks for the link - that (and linked threads) were a good read.

Unfortunately, the discussion covers replacing the underseat subs and powering with an amp. My intention is to keep them in the system and add a separate sub and amp.

Do you happen to know if the TechniquePNP add a sub harness will allow that? I am now a bit concerned that it will bypass the factory subs.

They are still out of stock and the info on their site is not intuitive at all.

[Wgosma]

Sub harness: I'm not very knowledgeable on audio, member with more expertise than me is what you need.

Maybe try the dedicated electronics/audio forum?...for sedans

Good luck/Bill

[spta97]

Originally Posted by Wgosma

Sub harness: I'm not very knowledgeable on audio, member with more expertise than me is what you need.

Maybe try the dedicated electronics/audio forum?...for sedans

Good luck/Bill

Thanks. In some of those threads it said that you can have both. I hope that is still the case.

[spta97]

I did some more brief testing last night. As per Bavsound the frequency response of the ghost subs is 60Hz-400Hz.

Using a test tone generator, I found that below 100Hz is where they start to rattle/distort.

For 8 ohm speakers, the Bass Blockers I found block below 75Hz, 150Hz, 300Hz, or 2,500Hz. I would love to go with the 75Hz but it seems like I would have to go with the 150Hz in order to eliminate the rattle/distortion.

Keep in mind I am playing these with the treble as low as it can go (EQ and boost) and the bass flat on the EQ and 2 clicks down on the boost - with my ear right next to the sub. With 100Hz or higher there was no rattle.

My only concern with a 150Hz cut off is my to be installed sub box would be reproducing frequencies higher than I usually request of it. My old cut off was 35Hz for the sub.

Not sure how this will sound in reality.

[Tchgrif]

Originally Posted by spta97

Thanks all for the test tracks! I'll do some more testing this weekend.

Tchgrif - What system do you have in your X3? Base? HK? Aftermarket?

its an x4M40 with HK and all speakers replaced with bavsound, I used the x3 bavsound ghost and mid tweeeters the only issue was the rears were the same size as the doors and they had shipped me smaller ones for there, I called them and they replaced with what I needed. really wished they made an amp but apparently its some BMW specific wire harness that's the issue.

[spta97]

Originally Posted by Tchgrif

its an x4M40 with HK and all speakers replaced with bavsound, I used the x3 bavsound ghost and mid tweeeters the only issue was the rears were the same size as the doors and they had shipped me smaller ones for there, I called them and they replaced with what I needed. really wished they made an amp but apparently its some BMW specific wire harness that's the issue.

Thanks. It could be my sensitive ears or something different with our models or even an issue with my HK amp (though I do not think so). Like I said the factory speakers had a similar distortion and I have only tried these subs with my X3MC.

Bavsound had great customer service throughout this experience.

Edit - They are supposed to be working on an amp. No ETA though.