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my530i

Member - Posts: 4

Joined: January 16, 2006

Location: United Kingdom

Posted: February 07, 2006 at 12:35 PM / IP Logged

Hi,

I'm interested in the following amps:

1. Infinity Car Audio REF5761A - Infinity 560 Watt 6-Channel Power Amplifier RMS Power @ 4 Ohms:60W x 4 + 107W x 2

http://www.woofersetc.com/index.cfm?fuseaction=product.display&Product_ID=2960

2. JBL Car Audio GTO755.6 - JBL 6 Ch 560 Watts Power Amplifier RMS Power @ 4 Ohms:60W x 4 + 107W x 2

http://www.woofersetc.com/index.cfm?fuseaction=product.display&Product_ID=3126

3. JL Audio e6450 - JL Audio 6 Ch 450 Watt Amplifier

45W RMS x 6 @ 4 ohm (12.5V);

http://www.woofersetc.com/index.cfm?fuseaction=product.display&Product_ID=254

to drive:

Front: 2 x MB Quart RVF 210 4" http://www.onlinecarstereo.com/CarAudio/ProductDetail.aspx?Productid=16674

Rear: 2 x MB Quart RVF 210

Under front seat left and right 40W OEM subwoofer

Would you guy give me your opinions?

My car is 2004 BMW 530i which has OEM sound system configuration as follows (Hi-Fi sound system 10 speakers):

Front Left: 4" mid-range + 1" tweeter

Front Right: 4" mid-range + 1" tweeter

Rear Left: 4" mid-range + 1" tweeter

Rear Right: 4" mid-range + 1" tweeter

Under front seat (left): 8" OEM shallow mount subwoofer (~40W)

Under front seat (right): 8" OEM shawllow mount subwoofer (~40W)

I want to upgrade my sound system is good anough to listen to music with as much detail as I can. I don't want to rattle my license plate :)

Thanks in advance.

DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: February 07, 2006 at 2:02 PM / IP Logged

My choice among those amps would be JBL.

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forbidden

Platinum - Posts: 5,353

Joined: November 01, 2003

Location: Alberta, Canada

Posted: February 07, 2006 at 2:13 PM / IP Logged

Check on those Quart speakers, if they say made in China on them instead of made in Germany, find new speakers as the made in China ones sound like arse by comparison to the good German models. If I am correct both the JBL and Infinity amps are going to be remarkably similar as both companies are owned by Harmon.

Top Secret, I can tell you but then my wife will kill me.

kfr01

Gold - Posts: 2,121

Joined: April 30, 2003

Posted: February 07, 2006 at 2:23 PM / IP Logged

my530i wrote:

Hi,

I'm interested in the following amps:

1. Infinity Car Audio REF5761A - Infinity 560 Watt 6-Channel Power Amplifier RMS Power @ 4 Ohms:60W x 4 + 107W x 2

http://www.woofersetc.com/index.cfm?fuseaction=product.display&Product_ID=2960

2. JBL Car Audio GTO755.6 - JBL 6 Ch 560 Watts Power Amplifier RMS Power @ 4 Ohms:60W x 4 + 107W x 2

http://www.woofersetc.com/index.cfm?fuseaction=product.display&Product_ID=3126

3. JL Audio e6450 - JL Audio 6 Ch 450 Watt Amplifier

45W RMS x 6 @ 4 ohm (12.5V);

http://www.woofersetc.com/index.cfm?fuseaction=product.display&Product_ID=254

to drive:

Front: 2 x MB Quart RVF 210 4" http://www.onlinecarstereo.com/CarAudio/ProductDetail.aspx?Productid=16674

Rear: 2 x MB Quart RVF 210

Under front seat left and right 40W OEM subwoofer

Would you guy give me your opinions?

My car is 2004 BMW 530i which has OEM sound system configuration as follows (Hi-Fi sound system 10 speakers):

Front Left: 4" mid-range + 1" tweeter

Front Right: 4" mid-range + 1" tweeter

Rear Left: 4" mid-range + 1" tweeter

Rear Right: 4" mid-range + 1" tweeter

Under front seat (left): 8" OEM shallow mount subwoofer (~40W)

Under front seat (right): 8" OEM shawllow mount subwoofer (~40W)

I want to upgrade my sound system is good anough to listen to music with as much detail as I can. I don't want to rattle my license plate :)

Thanks in advance.

What would I do?

1) Disconnect all your factory speakers. Forget about using them.

2) Get some kick panels to house some high quality 6.5" components.

3) Buy a single high quality 10" subwoofer and small sealed box for the trunk.

4) Buy a 4-channel bridgable amplifier. Run the front two channels to the components, bridge the rear channels to the subwoofer.

5) Have all of the above professionally installed.

6) Buy a bridgable 4-channel amplifier with flexible crossover settings for the front and rear channels.

7) Use a high pass crossover on the front channels. 80hz is a good starting point.

8) Use a low pass crossover on the rear channels. 80hz is a good starting point.

In my opinion this is the fastest and least expensive path to an excellent sound quality system.

Here are some benefits of using a kick panel location:

http://www.crutchfieldadvisor.com/S-ev2voYpmUbT/learningcenter/car/speakers_imaging_soundstage.html

Others include being able to use larger drivers that can handle more bass and bringing the speakers on axis.

New Project: 2003 Pathfinder

stevdart

Platinum - Posts: 5,816

This member consistently provides reliable information

Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: February 07, 2006 at 6:56 PM / IP Logged

I would use a high pass on the rears just the same as the fronts. The speakers aren't capable of sub bass freqs.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

kfr01

Gold - Posts: 2,121

Joined: April 30, 2003

Posted: February 07, 2006 at 7:18 PM / IP Logged

Right... low pass on the rear channels running the 10" subwoofer I recommend he use instead of the stock 8" drivers.

New Project: 2003 Pathfinder

my530i

Member - Posts: 4

Joined: January 16, 2006

Location: United Kingdom

Posted: February 07, 2006 at 7:28 PM / IP Logged

If I replace the two front seat sub, I'd replace them with Earthquake SWS-8" shallow mount 150W RMS

http://www.amazon.com/gp/product/B000AMI2HG/ref=sr_11_1/102-2217042-0908919?%5Fencoding=UTF8

According to JL, JBL and Infinity amp specs, JL is too wimpy for Earthquake SWS-8 150W RMS, and JBL/Infinity shoud be OK to drive it. However, JBL/Infinity don't have good SNR, THD, etc. compared to JL.

What's your opinion?

stevdart

Platinum - Posts: 5,816

Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: February 07, 2006 at 7:29 PM / IP Logged

Need opinion for my set up -- posted image.

Ahhh, I see now....thought that might have been a typo.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

stevdart

Platinum - Posts: 5,816

Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: February 07, 2006 at 7:33 PM / IP Logged

To drive a 150 watt continuous power handling sub....who's too wimpy??

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

my530i

Member - Posts: 4

Joined: January 16, 2006

Location: United Kingdom

Posted: February 07, 2006 at 7:44 PM / IP Logged

JL Audio amp is too wimpy to drive 4 MB quart set + 2 Earthquake SWS-8, according to the spec:

45W RMS x 6 @ 4 ohm (12.5V);

Earthquake SWS-8 is single coil 4-ohm.

MB quart: 40 - 90 W RMS.

For MB Quart, I think the amp is OK to drive those, but for Earthquake, I'm afraid it's too much for JL Audio e6450 - JL Audio 6 Ch 450 Watt Amplifier ?

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