[ctuna]

Not having good underseat speaakers that are not properly powered
is a big mistake they provide mid bass and mid range that the doors
and a sub cannot provide.

[j.f.leonard]

Originally Posted by ctuna

Not having good underseat speaakers that are not properly powered
is a big mistake they provide mid bass and mid range that the doors
and a sub cannot provide.

Okay so I need to stick to powering the subs and not the rear deck speakers?

[ctuna]

You should upgrade the under seats to.
Most of the High End shop owners are of the opinion
that rear speakers are a waste of money.

http://www.bimmerfest.com/forums/sho...d.php?t=550771

[j.f.leonard]

Originally Posted by ctuna

You should upgrade the under seats to.
Most of the High End shop owners are of the opinion
that rear speakers are a waste of money.

http://www.bimmerfest.com/forums/sho...d.php?t=550771

Okay and I get that, but for now I have the stock under seat subs so just to be clear you are saying it would be more of a loss disconnecting the under seats than it would be the rear deck speakers? I hope to install the new amp tomorrow with the technic harness.

[ctuna]

I would try it both ways if you have doubts.
No accounting for tastes if you are bass head
you might like it.
I amped my stock hi fi speakers and although it
delivered some bass where it didn't with the stock set
up it was kind of muddy.
I am not from the bass head era.
Best solution is to also find some underseats that will
deliver good mid bass and middle range frequency's.

[j.f.leonard]

Originally Posted by ctuna

I would try it both ways if you have doubts.
No accounting for tastes if you are bass head
you might like it.
I amped my stock hi fi speakers and although it
delivered some bass where it didn't with the stock set
up it was kind of muddy.
I am not from the bass head era.
Best solution is to also find some underseats that will
deliver good mid bass and middle range frequency's.

I am a basshead, but thats why I have my 2 12s in the trunk. I also like very clear and crisp sound when I listen to music other than heavy bass stuff like rock or something like that. I might have to try it both ways but if anybody has a good answer ill just go with that to save myself some time and see how that goes. Also, Im thinking about upgrading the underseat subs (if I end up wiring them in after all) with stock logic7 subs, but thats besides the main point.

[mweisdorfer]

Originally Posted by j.f.leonard

I am a basshead, but thats why I have my 2 12s in the trunk. I also like very clear and crisp sound when I listen to music other than heavy bass stuff like rock or something like that. I might have to try it both ways but if anybody has a good answer ill just go with that to save myself some time and see how that goes. Also, Im thinking about upgrading the underseat subs (if I end up wiring them in after all) with stock logic7 subs, but thats besides the main point.

Jenhert XE 200's by all accounts are the BEST mid-base type subwoofers for our cars.

The guy below is one of the very few dealers in the US.

Don Amann
Several consecutive Top 100 Installers list
Unexpected Creations
Several consecutive Top 50 Retailers list
eXquisite Marketing
Phone: 732-572-1969
Fax: 732-572-5508
Mobile: 732-921-9046
Unexpected Creations
eXquisite Marketing

They are $449.00; not cheap, but your are buying the best money can buy for our cars.

[ctuna]

I love my Jehnert xe 200'a
So accurate so warm .

[j.f.leonard]

Ill have to look into those, but back to the main question: Do we all agree it is still best to power the under seat woofers rather than the rear deck speakers even though I have 2 12s?

[mweisdorfer]

Originally Posted by j.f.leonard

Ill have to look into those, but back to the main question: Do we all agree it is still best to power the under seat woofers rather than the rear deck speakers even though I have 2 12s?

The rear deck speakers are only for surround sound and and effects. The only way you'd need to power them is if you changed them out to a better speaker, and they required more power to run them (for example BMW IA speakers)

The under the seat subs, in the logic 7 setup, are 4ohm and max out at 70watts. I have a 2-Channel JBL on mine without the LPF on. I let the JBL MS-8 do all the work, and I have their crossover set at 55. Amp gains & bass gains are barely turned up. The amp is 60w x 2 at 4ohm. If I turned up anymore than that, I'd get major distortion at 75-80% volume. I think the JBL amp only ran me $75.00 on sale

[j.f.leonard]

Originally Posted by mweisdorfer

The rear deck speakers are only for surround sound and and effects. The only way you'd need to power them is if you changed them out to a better speaker, and they required more power to run them (for example BMW IA speakers)

The under the seat subs, in the logic 7 setup, are 4ohm and max out at 70watts. I have a 2-Channel JBL on mine without the LPF on. I let the JBL MS-8 do all the work, and I have their crossover set at 55. Amp gains & bass gains are barely turned up. The amp is 60w x 2 at 4ohm. If I turned up anymore than that, I'd get major distortion at 75-80% volume. I think the JBL amp only ran me $75.00 on sale

Gotcha. Alright well I guess Ill leave those disconnected, thanks guys

[j.f.leonard]

I believe I have found something out that would explain ALOT... Are the rear deck speakers powered by the head unit and not connected to the hi-fi amp from the factory anyway...?

[Stubbie Blue]

I have the Match MS 42C-BMW.1 mids and tweeters running off a Kicker KEY180.4 Amp, and Match MW 8BMW-D subs on a Kenwood KAC-M3004 Amp.

https://www.1addicts.com/forums/show....php?t=1534261

I also upgraded the headunit in my 2012 135i:
https://www.1addicts.com/forums/show....php?t=1510420

The stock amp doesn't have enough power to run the Match speakers so you need to upgrade the amp. Also, the crossover between the Match speakers and stock underseat subs will not be right so you'll have to adjust that.

With a RTA phone app, I measured the Match 4" speakers and they start rolling off at around 125 Hz (with my Kicker Key EQ). So I set the LPF for my Match subs at 105 Hz and after lots of listening tests, that is where I feel that the crossover transition between subs and mids is smooth and balanced.

Since you already have 2 x 12" subs, then you probably don't need the underseat subs. Just set you sub LPF to around 105 Hz or whatever according to your taste.

I'm still using the stock rear deck speakers, but my Kicker Key amp automatically adjusts their EQ, level and delay so that they blend in with the fronts. Without this, they are actually louder than the Match speakers, so you might be better off leaving them off or reducing the gains on them if you can.

[soulgod123]

you want to power front components right components not coaxials with 4 channel amp plus your sub(subs?), than you power underseats with your aftermarket hu and when you setup this radio make rears not full range but as a sub, set at 100hz and fronts(rear speakers in this case) HPF 120hz and on amp your set sub LPF at 100hz. thats the best chose what you can have on your budged. thats what i have done on my cousins e90. sounds amazing. power from hu to crappy underseats is more than enough.

[j.f.leonard]

Originally Posted by Stubbie Blue

I have the Match MS 42C-BMW.1 mids and tweeters running off a Kicker KEY180.4 Amp, and Match MW 8BMW-D subs on a Kenwood KAC-M3004 Amp.

https://www.1addicts.com/forums/show....php?t=1534261

I also upgraded the headunit in my 2012 135i:
https://www.1addicts.com/forums/show....php?t=1510420

The stock amp doesn't have enough power to run the Match speakers so you need to upgrade the amp. Also, the crossover between the Match speakers and stock underseat subs will not be right so you'll have to adjust that.

With a RTA phone app, I measured the Match 4" speakers and they start rolling off at around 125 Hz (with my Kicker Key EQ). So I set the LPF for my Match subs at 105 Hz and after lots of listening tests, that is where I feel that the crossover transition between subs and mids is smooth and balanced.

Since you already have 2 x 12" subs, then you probably don't need the underseat subs. Just set you sub LPF to around 105 Hz or whatever according to your taste.

I'm still using the stock rear deck speakers, but my Kicker Key amp automatically adjusts their EQ, level and delay so that they blend in with the fronts. Without this, they are actually louder than the Match speakers, so you might be better off leaving them off or reducing the gains on them if you can.

I have a JL JX400/4D amp that im using to power the front components and either the rears or under seats. Many people say the under seat subs are important for sound quality so no answer is very clear at this point, I guess it comes down to personal preference

[j.f.leonard]

Originally Posted by soulgod123

you want to power front components right components not coaxials with 4 channel amp plus your sub(subs?), than you power underseats with your aftermarket hu and when you setup this radio make rears not full range but as a sub, set at 100hz and fronts(rear speakers in this case) HPF 120hz and on amp your set sub LPF at 100hz. thats the best chose what you can have on your budged. thats what i have done on my cousins e90. sounds amazing. power from hu to crappy underseats is more than enough.

I dont have an aftermarket HU

[j.f.leonard]

So can anybody tell me if the rear deck speakers are powered by the head unit? Ive seen it on a couple other forums and stuff but that doesn't make sense if I currently have a 6 channel HiFi amp. If I can power all of my speakers while having an upgrade 4 channel amp that would be great. If not, thats fine, but its worth it to ask!

[Stubbie Blue]

Originally Posted by j.f.leonard

So can anybody tell me if the rear deck speakers are powered by the head unit? Ive seen it on a couple other forums and stuff but that doesn't make sense if I currently have a 6 channel HiFi amp. If I can power all of my speakers while having an upgrade 4 channel amp that would be great. If not, thats fine, but its worth it to ask!

I don't think so. I've only heard of the Alpine upgrade kit that powers the fronts and subs off an amp while leaving the rears powered by the headunit.
https://www.1addicts.com/forums/showthread.php?t=505654

[Stubbie Blue]

Originally Posted by j.f.leonard

I have a JL JX400/4D amp that im using to power the front components and either the rears or under seats. Many people say the under seat subs are important for sound quality so no answer is very clear at this point, I guess it comes down to personal preference

Like I said, the Match 4" components play down to around 125Hz just fine. If your subs can play up to 125Hz then you can just use them and leave out the underseat subs. If you try to use the underseats as well, then you'll have a large boost in their frequency range and possible phase issues, or you'll have to deal with crossovers between the mids and underseats, and the underseats and your subs as well.

I would just run your fronts and rears off your JL amp, because you can reduce the gains on the rears so they become just background rear fill.

[j.f.leonard]

Originally Posted by Stubbie Blue

Like I said, the Match 4" components play down to around 125Hz just fine. If your subs can play up to 125Hz then you can just use them and leave out the underseat subs. If you try to use the underseats as well, then you'll have a large boost in their frequency range and possible phase issues, or you'll have to deal with crossovers between the mids and underseats, and the underseats and your subs as well.

I would just run your fronts and rears off your JL amp, because you can reduce the gains on the rears so they become just background rear fill.

Okay cool so when I tune my amp, would I put the switch on LPF and set that at 125hz? Do mids even need a HPF?

Also, I saw that musicar doesn't recommend leaving the rear speakers in the sound system unless you have parking sensors so I think I will start with powering the under seats and then go from there. Hopefully I don't have any issues as Im not very knowledgable with this kind of stuff. Im just looking to get the best sound I can.

Thanks for all the replies!

[j.f.leonard]

Hopefully I will get the amp installed tomorrow. I went with powering the front doors and under seats for now. Last thing I need to know is how to tune my amp? Right now I have it set to LPF for the mids at 125hz and set to LPF for the under seats at about 85hz. Does that sound about right? Thanks!

[ctuna]

More like 180 for the under seats low passed and 180 or above for the doors high passed . You want the under seats to carry as much midrange and midbass as they can. And you want the doors to go as low as they can. You can play with that number a little bit till you find something you like. Doors may be a little higher but high passed. Mine are 180 for under seats low passed and 200 for the doors high passed.