BMW M3 Forum (E90 E92)

BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   M3Post - BMW M3 Forum > E90/E92 M3 Technical Topics > Coding / ConnectedDrive / Audio-Video / Electronics / Bluetooth / I-Drive & Nav
 
INDustry distribution
Post Reply
 
Thread Tools Search this Thread
      10-28-2009, 11:57 PM   #1
frankzlin79
Lieutenant Colonel
 
frankzlin79's Avatar
 
Drives: 2013 Nissan GT-R
Join Date: Oct 2008
Location: Houston, Texas

Posts: 1,618
iTrader: (5)

JL Audio e6450 Questions

I have Premium Sound for my 2008 E92 M3. I've already ordered two Earthquake SWS 8xi (2 ohm version) subs, because I thought I was going to run a Rockford Fosgate P300-2 to just the two Earthquake subs and use the factory amp to power the rest of the speakers.

But then I remember that I have an very good condition JL Audio e6450, which is a 6-channel amp that came off of my old car. The specs are as follows:

INPUT SECTIONS:
No. of Inputs: Three Stereo Pairs Input Type: Differential, noise-cancelling with RCA jack inputs (low-level, three pairs) and multi-pin jack (high-level, two pairs) Input Range: 200mV - 8V RMS
AMPLIFIER SECTION:
AmplifierTopology: ClassABwithpatentedAbsolute SymmetryTM dual N-Channel MOSFET output design Power Supply: Unregulated MOSFET switching type
Rated Power (Stereo):
45WRMSx6@4Ω(12.5V) 75WRMSx6@2Ω(12.5V)
Rated Power (Bridged): 90WRMSx3@8Ω(12.5V) 150W RMS x 3 @ 4Ω (12.5V) THD at Rated Power: <0.08% @ 4 ohms per channel (20Hz-20kHz)
Signal to Noise Ratio: >104 dB referred to rated power (A-weighted, 20 Hz-20 kHz noise bandwidth) Frequency Response: 10 Hz - 25 kHz (+0, -1dB) Damping Factor: >200 @ 4Ω per ch./50 Hz, >100@2Ωperch./50Hz
Slew Rate: 22V/μs
AMPLIFIER FILTER:
Filter Type: State-variable, 12dB/octave Butterworth with continuously variable cutoff frequency selection from 50-200 Hz. Configurable as Low-Pass or High-Pass. Defeatable.

Here is the manual for those who understand how to read it!
http://mobile.jlaudio.com/pdfs/eSeries%20Amps/e6450.pdf

Can I use my JL amp to power the two SWS subs and power all of my factory speakers? (Should I have bought the 4 ohm version of the subs to be able to power my entire system with this JL amp?)

How about using my JL amp to power just the two SWS subs and the factory amp to power the remaining speakers?
frankzlin79 is offline   United_States
0
Reply With Quote
      10-29-2009, 02:17 AM   #2
roller
Private First Class
 
roller's Avatar
 
Drives: E92
Join Date: Jun 2009
Location: OC, CA

Posts: 164
iTrader: (0)

It will definitely work in powering the SWS subs.

I'm not sure if you can use it to power the other speakers also, as I don't know the impedance of the components.
roller is offline  
0
Reply With Quote
      10-29-2009, 02:51 PM   #3
Technic
Lieutenant General
 
Technic's Avatar
 
Drives: 2012 E92 M3, 2014 528i
Join Date: Apr 2005
Location: Ft Lauderdale, Florida

Posts: 10,848
iTrader: (16)

Garage List
2004 M3  [0.00]
I don't see the benefit in using this JL amp to power the 4" drivers for two reasons:

- there are 7 4" drivers in your car, each one powered by their own OEM amp channel. So you will need at least 5 channels of amplification (if you wire the 4 rear drivers in parallel) to drive all these speakers. That will leave you with a single mono channel of 75W RMS to drive two 4 ohms SWS-8 in parallel... not enough power.

- the OEM amp outputs around 75W max per channel at 4 ohms for the 4" drivers, and 150W max per channel at 7 ohms for the woofers. There is plenty of power already for the 4" drivers.

Now, you could set this amp to power a pair of 4 ohms SWS-8 in a bridged configuration which will yield a 150W RMS per channel, and still have one channel left:

Quote:
Rated Power (Bridged): 90WRMSx3@8Ω(12.5V) 150W RMS x 3 @ 4Ω (12.5V) THD at Rated Power: <0.08% @ 4 ohms per channel (20Hz-20kHz)
Technic is offline   United_States
0
Reply With Quote
      10-29-2009, 03:59 PM   #4
frankzlin79
Lieutenant Colonel
 
frankzlin79's Avatar
 
Drives: 2013 Nissan GT-R
Join Date: Oct 2008
Location: Houston, Texas

Posts: 1,618
iTrader: (5)

Yeah, but I've already bought two SWS 8xi (2 ohm version). I think it's best that I just sell this JL amp and use the proceeds to buy the Rockford Fosgate P300-2 to power the two SWS 8xi subs and use the factory amp to power the other 7 speakers.
frankzlin79 is offline   United_States
0
Reply With Quote
      11-05-2009, 04:54 AM   #5
quality_sound
8 tracks of madness
 
Drives: Slowly
Join Date: Jun 2009
Location: At home

Posts: 2,731
iTrader: (1)

Quote:
Originally Posted by Technic View Post
- there are 7 4" drivers in your car,
Does the Premium have some on the rear deck? I knew of 5 (doors and center channel) but I haven't even seen a Premium yet.
quality_sound is offline   United_States
0
Reply With Quote
      11-11-2009, 01:44 AM   #6
frankzlin79
Lieutenant Colonel
 
frankzlin79's Avatar
 
Drives: 2013 Nissan GT-R
Join Date: Oct 2008
Location: Houston, Texas

Posts: 1,618
iTrader: (5)

Yes, the Enhanced Premium sound has speakers in the rear deck. Enhanced Premium sound speakers are located as follows:

(2) front doors
(2) tweeters by mirror
(1) center channel
(2) subwoofers (under driver side and passenger front seats)
(2) rear doors (or rear sides if coupe)
(2) tweeters next to rear door speakers
(2) rear deck

That's 13 speakers total.
frankzlin79 is offline   United_States
0
Reply With Quote
      11-11-2009, 09:26 AM   #7
Technic
Lieutenant General
 
Technic's Avatar
 
Drives: 2012 E92 M3, 2014 528i
Join Date: Apr 2005
Location: Ft Lauderdale, Florida

Posts: 10,848
iTrader: (16)

Garage List
2004 M3  [0.00]
Quote:
Originally Posted by frankzlin79 View Post
Yes, the Enhanced Premium sound has speakers in the rear deck. Enhanced Premium sound speakers are located as follows:

(2) front doors
(2) tweeters by mirror
(1) center channel (coaxial)
(2) subwoofers (under driver side and passenger front seats)
(2) rear doors (or rear sides if coupe) (coaxial)
(2) tweeters next to rear door speakers
(2) rear deck

That's 13 speakers total.
... 16 speakers total.
Technic is offline   United_States
0
Reply With Quote
      11-11-2009, 11:32 AM   #8
frankzlin79
Lieutenant Colonel
 
frankzlin79's Avatar
 
Drives: 2013 Nissan GT-R
Join Date: Oct 2008
Location: Houston, Texas

Posts: 1,618
iTrader: (5)

Eh? I still only count 13 speakers. Where are the other 3, Technic?
frankzlin79 is offline   United_States
0
Reply With Quote
      11-11-2009, 12:05 PM   #9
Technic
Lieutenant General
 
Technic's Avatar
 
Drives: 2012 E92 M3, 2014 528i
Join Date: Apr 2005
Location: Ft Lauderdale, Florida

Posts: 10,848
iTrader: (16)

Garage List
2004 M3  [0.00]
Quote:
Originally Posted by frankzlin79 View Post
Eh? I still only count 13 speakers. Where are the other 3, Technic?
... three extra tweeters in the coaxial drivers.
Technic is offline   United_States
0
Reply With Quote
      11-12-2009, 06:40 AM   #10
quality_sound
8 tracks of madness
 
Drives: Slowly
Join Date: Jun 2009
Location: At home

Posts: 2,731
iTrader: (1)

Quote:
Originally Posted by frankzlin79 View Post
Yes, the Enhanced Premium sound has speakers in the rear deck. Enhanced Premium sound speakers are located as follows:

(2) front doors
(2) tweeters by mirror
(1) center channel
(2) subwoofers (under driver side and passenger front seats)
(2) rear doors (or rear sides if coupe)
(2) tweeters next to rear door speakers
(2) rear deck

That's 13 speakers total.
No wonder it sounds like ass. 13 drivers in a compact? Where's my epic fail smiley when I need it?
quality_sound is offline   United_States
0
Reply With Quote
Post 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 04:24 AM.




m3post
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