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Discussion Starter · #1 ·
Hi all,

I bought a used 2009 X3. The stock sound system was terrible, bit I had limited budget.

Anyway, I installed an Audison SR4 to drive the woofer under the seats, as well as the front speakers and tweeters. The back speakers continues to be driven by the head unit.

The tweeters are installed at the triangular black piece of plastic on the inside of the side mirror.

Due to the sitting position of the SAV, and the way human ears are more sensitive to higher frequency, the sound becomes very one sided..

I can consistently hear the music from my right. (Singapore is right hand drive). This is irritating.

Anyone has similar experience? How did you solve it?

Thanks in advance.
 

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The first thing I think of is that you've kept the original speakers. How have you connected up the SR4 ? I'm not so familiar with the OEM systems on the newer BMW's to the extent I know them very well, however, I 'think' that the OEM amplifier has specific outputs for each driver. So it'll drive the woofers via one set of wires, the midrange via another set and the tweeters via another set. I think that amplifier unit is called a 'CCC'. The Audison has 4 channels of full range frequency output, so I'm wondering how you connected it up, including where it gets the inputs and how you've connected it to the speakers in the front. I suspect you've actually connected it to the tweeters only and hence getting a very unbalanced sound.

To update the audio in these newer BMW's - if you do indeed have that CCC amplifier unit with specific outputs setup in your car, you'll need a Signal Summing processor, that will 'add up' the separate outputs into one full range frequency. That output can then be connected to a unit which processes that signal to make it a flatter response and outputs it to phono/RCA connectors. You can then connect that output to an aftermarket amplifier - in your case the Audison SR4. The outputs from the SR4 can then be connected to a 3 way crossover so that the woofer, midrange and tweeter get the correct frequencies. I'd also say to uprate the speakers to higher quality ones to really benefit from having the audio upgrade. When done properly the sound will be balanced and much better than the standard OEM setup.

Perhaps find a local car car hifi specialist to discuss how to get the above done :)

Cheers, Dennis!
 

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Discussion Starter · #3 ·
hi Dennis,

thanks for your comments, appreciate all help i can get, as this morning, when i drive to work, the Left / Right issue, is really getting on my nerve...

1) I change the 2 front 4" stock speaker to a set of Rainbow 4" and a pair of tweeters.

2) The SR4 is connected to a crossover and then to the 2 front speakers and those woofer under the seats. The HU continue to drive the rear end speakers. The input of the SR4 is directly from the HU.

I hear what you are saying... Will probably get another person to look at it.

The installer kept saying that due to the position of the speakers in the X3, this is the end result, nothing much he can do, but I really don't think so. And his staff just kept saying that i should have upgraded the amp to a Audison Bit One, instead, and he think that would solve the problem.

Until he show some credibility, i am refusing to pass him a single cent of my hard earn money...
 

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Hi again,

Bit confusing ...

1. The fronts now have a set of Rainbow 4inch component speakers - that bit is fine and Understood.

2. You say the SR4 is connected to a crossover, then you say the SR4 is connected directly to head unit? do you mean;

The SR4 takes it's INPUT from the speaker outputs of the head unit, and that 2 of SR4's output channels are connected to the Rainbow crossovers and then onto the speakers themselves?

If so, then what's the other 2 channels of the amplifier doing as you say the rear speakers are also being powered from the oem head unit? if they're not connected, seems like half your amplifier is a waste at the moment !

It's difficult to ascertain what might be wrong here, but I also suspect that it's how the acoustics might be in an X3 and from what it looks like with the imbalance of power and the rear speakers, it just might be apparent the right side is brighter sounding. With a more balanced setup, I'd think you'd find it all sounds alot better.

cheers, Dennis!
 

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Discussion Starter · #5 · (Edited)
Hey Dennis,

good morning (9 am in Singapore)

Your understanding in point 2 is correct. The other 2 channel of SR4 is connect directly to a pair of 6.5" under the seat.

My installer told me that the brighter sounding right was due to the positioning of the speakers and the sitting position on the X3. Which is a point i am finding it hard to agree with, given that the seating and speakers positions are not that much different from the E90 I traded in for.

I would like to hear about the "balance setup", in your opinion, how should this be done?

The drive to work this morning, almost killed me. And just to share, I only have 25% hearing in my right ear, but i am still catching all the sound from my right. which means, for the passenger on the left, it would have been much much worst...
 
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