I am a responder on that Facebook post, the guy who made the statement is an ex phase linear tech
i did respond by stating I have never measured any difference in phase (which would effect timing also) between a stereo channel and then when I bridged the same amp onto the mids also, so I stated I didn’t see how it could be an issue
he wasn’t talking about a stereo input, he specifically was saying it in response to someone who wanted to bridge an amp to run various drivers (not subs)
I got told I didn’t know who he was or words to that effect, I replied with when I’ve done exactly this I have never seen any difference in phase at the speakers actual output when measured at the listening position
he does definitely know his onions and has pedigree, but I dismissed it as a none entity
as in theory at least if one pair of channels induces some kind of phase shift then the other pair of channels would, and so the phase would still match if anything changed at all
i understand that when bridging the phase is inverted on one channel of a pair to be bridged as it’s driven from the negative vs the first channels positive so when combined there is a push pull effect occurring, but that won’t effect the phase of the output as it just makes a bigger sine wave with twice the voltage effectively
curious as to what he’s speaking about… but I haven’t measured it in any case where I’ve been using stereo channels and then swapped to bridged channels and I do like measuring phase