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Seems right hand side is louder, need helps

Dear Audiophiles,
Need helps from U guys! I have this problem comes on n off for about 1.5 year. I owned the spk Avalon Eidolon. My problem is everytime whenever I turned off the power, I need at least 2 or more days to recover the centre of the vocal, which I use the XLO Test CD, which can tells u left ,right,n centre, phase.
However just about 3weeks ago, I found the right hand side tends to give louded volume, this thing never change ,even I never turn off the power atall, also I cannot get the voice from the centre. This really boarded me alots. Where I test the power amp output curent, bothside have the same voltage, where one of the track in the CD has for both side equally.( Mono ).
This Maybe due to the placement of the SPK as I thought, however I tried many times, it just can't work out. I really hopes someone may helps out there at Audiogon. My problem is: The vocal keeps going to the right about 1foot from the centre.N I can feel the right hand side sounds louded, but when I went close to the spks abt few inches, it seems to me both side the same.It is really headache toi me. Will be very appreciate if someone would share the experience.Thanks! N Happy listening to u guys! ****** Cheers! ******
hifi

Showing 2 responses by flex

flex
292 posts
 
If you check that the voltage going into the left and right amplifier channels (or monoblocks) is matched within less than 0.1 volt, there is no point in reversing any of the components upstream. If you also have measured the amp outputs to the speakers and find those to be matched, then its either the room (most likely), the speakers (less likely), or just conceivably a problem with one of the speaker cables.

There are many things you can do to diagnose the source:
Regarding the room, if the room is not already well treated acoustically, try taping heavy sheets over all reflective surfaces, which will deaden the sound but leave you with only the direct reflections from the speakers, and check the center imaging as you do this. It's been a source of amazement to me how much effect reflections coming even from walls in adjacent rooms have on image formation. The ceiling and floor are equally important.
Regarding the speakers, you can measure the amplitude response of each speaker at a group of frequencies across the audio band. I would borrow a measurement setup for this (microphone + measurement equipment) rather than doing it by ear.
Also, you can just use the balance control on your preamp, if you have one, to offset the apparant gain difference. This is cheap EQ.

Best luck.
flex
292 posts
 
This is a semi-quibble with Sean but nothing serious. If you are doing the XLO measurements with their test disc, then you are using a simple tone directed to the left, then to the right speaker, and measuring the amplifier output voltage as the system plays, i.e. under load. In this situation, if the voltages match (and I have to borrow voltmeters from work to get to the millivolt ranges they are referring to), then you are accounting for all the upstream contributions, so you wouldn't need to go through switching components. Reseating cables periodically is still a good idea (and cleaning terminations, while you're at it).
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