Amigos, I am going to bi-amp my line arrays. I built with the help of Miniscus audio a stereo pair of line arrays using 12 - 5"fountex tweeters and 12-5"eton mid-basses in a ported box 84"tx12"w x 17"d which weighs close to two hundred pounds ea. They are heavily braced and the passive crossover is 24db per octave 4th order at 2600hz. My question is that I finally saved enough money to get the DEQX 2.6p on sale and I will bi-amp. My amps are the Aleph 1.2's-200wt/ch which I will use for the mid-bass and they have about a 50 milli-volt dc offset on the output (I built these 6 years ago from the schematics on the Pass Labs website). The tweeters I intend to drive with my Pass - Tharagard A-75 class A amp I buillt 12 years ago. This amp has about a 20ma dc offset. The 2.6P will go as usuall before the amps which means that when I remove the outboard crossover the 12 tweeters will see this 20-50(cold)mv dc offset. My question is if that is a danger to the ribbon tweeters as they will divide this offset by 12 and only see about 4mv each?? My solution to protect them was to put a 40uf pp cap in series with the amp output as this would attenuate and block all frequencies below 120hz. However now I have a cap in series but I am thinking a 40uf cap should not affect the phase relationships at the crossover pt which now will be 96db between 2k and 2.6k hz. Of course this also helps in case you get a pop at start up with the amp for some reason. The amp will be fused with 2amp output fuses.
I am not concerned about the Eton drivers as they can handle the dc offset with no issues.
Bi amping has been around a long time so others must have faced or ignored this problem. But with 12 tweeters this could get expensive if I am wrong. Please help and thanks, dave
