E90Post
 


 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > AUDIO/VIDEO + BLUETOOTH + Electronics/Alarm/Software > Base Stereo Upgrade question



Reply
 
Thread Tools Search this Thread
      09-18-2010, 10:08 PM   #1
akhter
Major
 
akhter's Avatar
 
Drives: F10 LCI 520i Sophisto Grey
Join Date: Oct 2007
Location: Hong Kong

Posts: 1,146
iTrader: (0)

Garage List
Base Stereo Upgrade question

Ok finally ordered for my march 2010 production 325i with idrive and base stereo (6 speaker/no amp).

Equipment
DLS Reference R4 2-way component 4 inches
DLS Reference RA50 5 channel (4 x 70 W + 1 x 265 W class AB) The amp accepts high level input and has built in crossover. Channel 1/2 can be high and lo passed. channel 3/4 can be high passed and channel 5 can be low passed and has a subsonic filter.
Hifi rear shelf mid+tweeters (I had these from the speaker upgrade in my last car)
BMW OEM window sails

Setup
DLS tweeter tweeter in A pillar using OEM trim for a factory look.
DLS mids in front door
Factory underseats in parallel using 265w sub amp channel
Hifi mids+tweeter in rear shelf (because currently there are no tweeters in rear shelf on 2010 model)

The installer was recommend by the dealer. Paid deposit and ordered the components. Installation in 2 weeks because the OEM trim will have to be ordered from BMW.

According to the amp manual, the subwoofer output is 2 ohm stable. Two 4 ohm subwoofers can be connected in parallel so use the sub channel to power the underseats in parallel. This also allows me to upgrade to SWS or Morel underseats in the future.

Now I have 2 choices:

1) Active crossover the front 2-ways and use the factory head unit to power the rears. Not use the DLS crossover that comes with the fronts.

2) Use the DLS passive crossover and use channel 1/2 for fronts and 3/4 for rears.

Which should I go for? Any other considerations?
__________________
Current 2013 F10 LCI 520i Sophisto Grey|Hong Kong
Sold 2010 E90 LCI 325i Silver Grey|Hong Kong
Sold E90 335i M Sport Alpine White|Tokyo
Sold E36 328i Jet Black|NYC

Last edited by akhter; 09-18-2010 at 10:14 PM.
akhter is offline  
0
Reply With Quote
      09-20-2010, 12:53 AM   #2
VP Electricity
Brigadier General
 
VP Electricity's Avatar
 
Drives: E91 XDrive
Join Date: Jan 2008
Location: portland oregon

Posts: 3,177
iTrader: (3)

Are you recoding the HU?
VP Electricity is offline   United_States
0
Reply With Quote
      09-20-2010, 01:39 AM   #3
808MGuy
Colonel
 
808MGuy's Avatar
 
Drives: 2009 E90 M3
Join Date: Jun 2008
Location: Oahu, Hawaii

Posts: 2,282
iTrader: (3)

Quote:
Originally Posted by VP Electricity View Post
Are you recoding the HU?
Plus, aren't the OEM underseats 2 ohms? Wiring them in parallel would give you a 1 ohm load which your amp probably won't care for. Unless the base audio underseats are different from the hi-fi and come in 4 ohm, you might have to wire those in series to get a net 4 ohm load to the amp.
__________________
09 E90 M3 - Interlagos Blue / Black Novillo / Sycamore Anthracite / Eibach / HRE

808MGuy is offline  
0
Reply With Quote
      09-20-2010, 05:37 AM   #4
akhter
Major
 
akhter's Avatar
 
Drives: F10 LCI 520i Sophisto Grey
Join Date: Oct 2007
Location: Hong Kong

Posts: 1,146
iTrader: (0)

Garage List
Quote:
Originally Posted by VP Electricity View Post
Are you recoding the HU?
I am trying to arrange that. If that fails (looks likely) then will have to get a cleansweep to flatten the signal.
__________________
Current 2013 F10 LCI 520i Sophisto Grey|Hong Kong
Sold 2010 E90 LCI 325i Silver Grey|Hong Kong
Sold E90 335i M Sport Alpine White|Tokyo
Sold E36 328i Jet Black|NYC
akhter is offline  
0
Reply With Quote
      09-20-2010, 05:54 AM   #5
akhter
Major
 
akhter's Avatar
 
Drives: F10 LCI 520i Sophisto Grey
Join Date: Oct 2007
Location: Hong Kong

Posts: 1,146
iTrader: (0)

Garage List
Quote:
Originally Posted by 808MGuy View Post
Plus, aren't the OEM underseats 2 ohms? Wiring them in parallel would give you a 1 ohm load which your amp probably won't care for. Unless the base audio underseats are different from the hi-fi and come in 4 ohm, you might have to wire those in series to get a net 4 ohm load to the amp.
I thought the underseats were 4 ohms:

http://www.e90post.com/forums/showpo...2&postcount=11

Can some confirm this?

According to the manual the sub channel can handle 4 ohm or 2 ohms. Also according to the manual running 2 4ohm subs in parallel is ok.

how should i hook them up?
__________________
Current 2013 F10 LCI 520i Sophisto Grey|Hong Kong
Sold 2010 E90 LCI 325i Silver Grey|Hong Kong
Sold E90 335i M Sport Alpine White|Tokyo
Sold E36 328i Jet Black|NYC
akhter is offline  
0
Reply With Quote
      09-20-2010, 07:13 AM   #6
kaigoss69
Brigadier General
 
kaigoss69's Avatar
 
Drives: '08 335i
Join Date: Jul 2008
Location: JAX

Posts: 3,029
iTrader: (5)

Quote:
Originally Posted by 808MGuy View Post
Plus, aren't the OEM underseats 2 ohms? Wiring them in parallel would give you a 1 ohm load which your amp probably won't care for. Unless the base audio underseats are different from the hi-fi and come in 4 ohm, you might have to wire those in series to get a net 4 ohm load to the amp.
Actually, I believe the amp would be fine as long as it did not produce more power than what it is rated for. At 2 ohm, it is rated for 365W. At 1 ohm, it would probably produce a bit more. However, the OEM woofers would probably not even take a third of the rated power before getting destroyed, mechanically and thermally.
kaigoss69 is offline   United_States
0
Reply With Quote
      09-20-2010, 09:31 AM   #7
akhter
Major
 
akhter's Avatar
 
Drives: F10 LCI 520i Sophisto Grey
Join Date: Oct 2007
Location: Hong Kong

Posts: 1,146
iTrader: (0)

Garage List
Quote:
Originally Posted by kaigoss69 View Post
Actually, I believe the amp would be fine as long as it did not produce more power than what it is rated for. At 2 ohm, it is rated for 365W. At 1 ohm, it would probably produce a bit more. However, the OEM woofers would probably not even take a third of the rated power before getting destroyed, mechanically and thermally.
I won't be playing too loud. Which will be better? Series or parallel?
__________________
Current 2013 F10 LCI 520i Sophisto Grey|Hong Kong
Sold 2010 E90 LCI 325i Silver Grey|Hong Kong
Sold E90 335i M Sport Alpine White|Tokyo
Sold E36 328i Jet Black|NYC
akhter is offline  
0
Reply With Quote
      09-20-2010, 10:57 AM   #8
kaigoss69
Brigadier General
 
kaigoss69's Avatar
 
Drives: '08 335i
Join Date: Jul 2008
Location: JAX

Posts: 3,029
iTrader: (5)

Quote:
Originally Posted by akhter View Post
I won't be playing too loud. Which will be better? Series or parallel?
Run it in series. A lot of amps go into protection when the impedance is too low (I didn't of that before). Besides, you will have better range on the gain control in 4 ohm.
kaigoss69 is offline   United_States
0
Reply With Quote
      09-20-2010, 11:12 AM   #9
kaishang
Colonel
 
Drives: 2010 E90 330d
Join Date: Jul 2010
Location: London

Posts: 2,198
iTrader: (0)

How are you doing the cross-over on the new tweeters in the rear?
kaishang is offline  
0
Reply With Quote
      09-20-2010, 11:17 AM   #10
VP Electricity
Brigadier General
 
VP Electricity's Avatar
 
Drives: E91 XDrive
Join Date: Jan 2008
Location: portland oregon

Posts: 3,177
iTrader: (3)

I re-read this. Given that you're keeping the OEM 6" speaker (calling it a subwoofer is a terrible misnomer), it doesn't matter what you do. It will sound terrible.

While I like the RA series, I've never used the speaker level input feature. Don't know how it will sound, but I've developed a preference for true balanced inputs and switchable ranges over the years.

And since the underseats have to run to 200-ish, not liking running them in mono.

Why not get an RA40, leave the rears on the deck power, leave the underseats in stereo, and upgrade them?
VP Electricity is offline   United_States
0
Reply With Quote
      09-20-2010, 06:00 PM   #11
akhter
Major
 
akhter's Avatar
 
Drives: F10 LCI 520i Sophisto Grey
Join Date: Oct 2007
Location: Hong Kong

Posts: 1,146
iTrader: (0)

Garage List
Quote:
Originally Posted by VP Electricity View Post
I re-read this. Given that you're keeping the OEM 6" speaker (calling it a subwoofer is a terrible misnomer), it doesn't matter what you do. It will sound terrible.

While I like the RA series, I've never used the speaker level input feature. Don't know how it will sound, but I've developed a preference for true balanced inputs and switchable ranges over the years.

And since the underseats have to run to 200-ish, not liking running them in mono.

Why not get an RA40, leave the rears on the deck power, leave the underseats in stereo, and upgrade them?
Ok, slightly modified plan. By downgrading the amp to the DLS CA51, I was able to add the cleansweep and still keep things in my budget. I ordered technic's harness and was able to get a cleansweep for a reasonable price (initially every place here was asking ~500).

Technic harness -> cleansweep -> CA51 amp

The xover for the fronts will be mounted in the trunk. New wires from the amp to all speakers. This was I can experiment with active xover for the fronts since all the wires are in one place. The CA51 is a slightly less powered version of RA50 (4x50wpc+1x170). also the CA51 will be getting line level RCA output of the cleansweep.

I agree 170ch at 4 ohms while running the underseats in series (or parallel?) is pushing it. In future I plan on getting a sws-8 pair which is the reason for going with a 5ch amp now.

for the rears, I have both the Hifi mids and hifi tweaters with the original tweeter cable that plugs into the mids with the little thing inside the cable. I assume that is some sort of lame xover/filtering/hi-pass circuitry.
__________________
Current 2013 F10 LCI 520i Sophisto Grey|Hong Kong
Sold 2010 E90 LCI 325i Silver Grey|Hong Kong
Sold E90 335i M Sport Alpine White|Tokyo
Sold E36 328i Jet Black|NYC
akhter is offline  
0
Reply With Quote
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 12:38 PM.




e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST