Re: Lab Subs
Tim,
As Jay and Ryan mentioned, adding delay to the inputs makes the back line even further out of time sync from the mains.
If the back line amps and drums are 15 feet behind the mains, to "sync up" the mains need to be delayed about 15 milliseconds, the time of flight from the back line.
If you delayed the back line inputs by 15 ms, they would be around 30 ms behind the PA.
15 ms is only perceived as a discreet echo at high frequencies, 30 ms is long enough to be perceived as an echo on any instrument or voice.
Delaying the instruments does make the PA seem louder than the backline due to the Haas (precedence) effect, that which we hear first seems louder.
Art
