Hello everybody... I was wondering:
1. It says to hook up these speakers to common ground amps only. How can I tell if an amp is common ground without calling the manufactures? Are most amps common ground?
2. Has anyone every replaced the PR with a woofer or a sub? If so, which ones are reccommended and could I possibly damage the mid's or woofers currently in place by doing this? I know better than to hook it up to the crossover inside the speaker.
3. Can anyone reccomend a "vintage" amp to drive these speakers? I have been looking at the crown psa-2. But noone knows about the common ground issue on these older amps.