Last night a well known car audio guy said:
“You do not want to bridge two channels into one mono channel for broadband use, there are multiple phase shifts through the bandwidth. You don’t have this issue when bridging an amp for sub use when your bandwidth is set the less than 100 hz. When using amp amp in bridged (mono) for bandwidths that cover broader ranges you will encounter phase shifts between the two channels at certain frequencies. This tends to destabilize image and stage as the phase changes.
You will be having phase shifts, it happens in ALL 2 channel amps when bridged to mono use over broad frequency ranges. It’s the inter-reaction between the two channels.”
I am neither agreeing nor disagreeing with him because in my +35 years of being an amateur car stereo guy this is the first time that I have ever heard that.
To put this in context the discussion was about using bridged (or monoblock) full range amplifiers on door speakers. So I wanted to see if anyone has anymore information on Phase shifts from using full range bridged amps?