In the vertical passive bi-amp configuration you have the same signal going through both amplifier channels, while in the horizontal configuration the signal is different to some degree. Therefore inter-channel crosstalk and other inter-channel effects that may occur through the power supply and grounds of each amplifier will be greater in the horizontal configuration than in the vertical configuration. See the comments by Steve McCormack (Stevemcx) in this thread:
http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1234896660&openfrom&6&4#6
The degree to which these effects occur will be amplifier dependent, of course.
Regards,
-- Al
http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1234896660&openfrom&6&4#6
The degree to which these effects occur will be amplifier dependent, of course.
Regards,
-- Al