Hey guys.

Today, I got the front splits "upgraded" (quotation marks because...there is a rather amusing story to that) with new Sony 6.5" splits.

I didn't take much notice when driving, but when I got home, I noticed the left was a fair bit louder then the front right when this wasn't previously an issue. Sitting in the back, I felt that the right 6x9 (which is still stock, next thing on list) was slightly louder, but this might be nitpicking.

Changing the balance required about a 4/5 degree setting on the head unit (Sony, so I couldn't change each speaker seperately) to make the front speakers the same, which left the rear speakers far out of whack.

I have a 4 channel amplifier which is connected to the speakers, and it has 2 dials on the side, but as the previous owner installed them directly under the passengers seat, I actually have no idea what those dials are for.

But when I turned them over to the left (I guess that would be default position, as they certainly weren't in the middle) it really felt to me like the speakers were now equal in loudness to eachother.

Is this a feature of a typical 4 channel amplifier or is this just a crazy placebo effect? I still feel there might be slight bias to the left but as the steering wheel covers the right speaker a little from the center of the car I think its correct anyway.

Next time I'm out with mates I might ask them if they sense anything a bit off.

If the amp only has two control knobs on the side, one of them would be gain (volume basically) and either a Low Pass filter or High Pass filter. Adjusting either of the filter knobs will pick a freq cut off point for the speakers, HPF is for speakers, LPF is for subs. The Hpf filter should be set somewhere about 75hz I think from memory to avoid any low signals (bass) hitting your speakers.

By adjusting both these knobs down(to the left) you have effectively turned down the volume being fed to the speakers and lowered the frequencies being transmitted to the front speakers, most cases this isn't a good idea as cheap speakers don't have cross overs. Your splits should be ok with a mild amount of bass being fed to them as the cross over should eliminate any bad feqs. I would adjust the gain back up to maybe a 1/4 of a full turn and see how they sound, they apply the same setting to the HPF knob and see how she sounds. If you only two knobs to tune, it should take about half an hour or so to get it perfect.

Sounds a bit like you have the fronts RCA outs and the speakers connected to a channel on the front half of the amp and one to the rear half.

I'd disconnect the all the RCA's and the speaker cables and start again, using the fader to isolate a speaker and reconnect, FL to Channel 1 FR to 2 - and RL to 3 and RR to 4.

Set the Front Pass Switch to High pass and set the knob to about 60 Hz, leave the gains alone if its not distorting - or until you understand the damage you can do by playing with them (http://www.aussiemagna.com/forums/showthread.php?t=91867&p=1444323&viewfull=1#post1444323).
Set the rear Channels to Full - No filtering - if there is no sub.

Models and Pics help out big time...