In article , Chris Morriss wrote:
In message , John Phillips
writes
Is a 2.7 dB left-right stereo imbalance reasonable for a loudspeaker-room
interaction in a nearly symmetrical room?

My last system needed no tweaking of the left-right balance control to
get a central image. However my current system needs a 2.7 dB shift in
the balance control. I have checked the source balance and swapped all
components (including leads) and the imbalance remains in either the
room or my ears.

I assume this imbalance is a loudspeaker-room interaction. The room is
not perfectly symmetrical but not far out. An intruding chinmey breast
is the main asymmetry, apart from furniture.

Is this at spot frequencies, or were you using a 1/24th octave RTA with
pink noise?

No. It was much simpler. I did check the balance at 250 Hz but it
is mainly just set by ear to centralize the stereo image between the
speakers. Without the 2.7 dB attenuation in the left channel (0 dB in
the right) the stereo image is crowded towards the left speaker.

For clarity I run the variable output of my CD player into a power
amplifier through a pair of pi-topology fixed resitive attenuators (Z =
~5k ohms) whose voltage gain (as above) is computed from the resistor
values.

--
John Phillips