Hey everyone, my first post.
I have an annoying problem in my little theater setup.
The setup it self consists of three LCR speakers (Jamo d500 THX) in the front, and two surround speakers ( System Audio Saxo 1)
on each side of the listening position. Coupled with a Velodyne spl 800 Ultra subwoofer.
The speakers are driven by a Harman Kardon AVR 355 receiver and a Creek Audio amplifier.
Source for material is a Cambridge Audio Azur 751BD.
Now to the problem, i noticed a couple of days ago that the sound from the center channel seemed to emanate not only from the
center channel but also between the actual center and right channel.
I decided to investigate and therefor turned of all speakers except the center to see if there was an in balance between the speakers
them self's but that was not the case.
Even though all speakers except center channel is turned of the sound seems to come from the right...
How can this be, I have tried everything.
I have added absorbents to the wall, checked early reflection points using a mirror.
The only thing that helped somewhat, solved maybe 75% of the problem was to move the center of axis to the left.
Does any one have any ideas, thoughts on the matter?
My room with furniture, absorbents etc. (rear speakers removed, not to clutter image)
As fbrang pointed out the amount of reflection on the right side is significantly shorter (more focused likely) than on the left.
Those speakers are placed horizontally, could it be a faulty mid? the one to the left in the center speaker in this case?
Thanks everyone for jumping in.
The right speaker is indeed in the corner, only place i could but it.
The gain that the corner placement adds (+5db) is adjusted with the level settings.
I only noticed the center channel issue a few days ago because the LCR speakers are only two weeks old.
You could actually call it a panning problem, the center is panned to the right and this is even though
the front left/right speakers and the rear speakers are disconnected.
The issue is at its worse when there is a dialog playing.
I am not using any audyssey or ezset eq (harman kardon equivalent) since I am running a analog setup.
Cambridge bluray player has 7.1 analog outputs (wolfson upsampling dac 192/24bit)
Better with real picture than paint...
Even after that, the asymmetry of walls is really difficult to correct completely.
Thank you hopefulfred, great stuff.
I have been moving around bits and pieces of studio grade absobents, and also some auralex panels throughout
the room. I have yet to find the troubled area.
Early reflection point (first) for center speaker is on the right hand corner of the left most absorbent.
Even when treating with every single panel I had the problem remained.
I am going to try the floor next... bring out the big guns, blankets and sheets :)
Left and right speakers are not the issue, both of them sound amazing.
It is the center speaker, alone without the other speakers that is the actual problem.
The sound from the center speaker is perceived to come not only from in front of the listening position
but also from the right of the listening position.
No luck as of yet in solving the problem, tried some absorption on the floor and again with the first reflection
I realize the sound field would change because of the way our head and ears are shaped but have you tried turning around on your knees in the seat to see if you still hear the majority of the sound from the wall side..
The way I have measured my setup is to set the speakers to have the same spl output at
the actual listening level, not some imaginary level that I will never listen at.
A normal listening level for me would be when the receiver is at the -25 position.
This volume yields a 53 db level for the SUB, LEFT, CENTER , RIGHT channels and I then run the left/right surround
speakers 3 db lower (50 db).
Find the -3 db difference for the surround channels to be a nice balance.
Which is also something Dolby ran with at one point.
"Surround 3 dB Attenuation
This ﬂag is used when projects are mixed in a facility that normally presents feature ﬁlms and is
properly calibrated to ﬁlm standards for sound reproduction levels. It is usually left off for projects that
are mixed in facilities that are calibrated video style. Video-style facilities use the same sound pressure
level (SPL) for each speaker. Film facilities set the surround speaker levels 3 dB lower than the front
channel speaker levels. All levels are set individually. The setting of this parameter tells the Dolby
Digital encoder how to set the gain for the surround channels before encoding."