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In Reply to: RE: Love the sound of the GPA 902's posted by deathtube 667 on August 02, 2015 at 12:08:33
I remember reading at one time that the 80X series of drivers were designed to roll off above 8k. They were designed for sound reproduction in movie theaters, and the optical sound tracks had no information above that. They designed them to roll off to reduce the noise above the optical tracks upper limit.
Follow Ups:
Bill at GPA told me the same thing.
Mine are dropping out a lot sooner in room, but I need to take some on-axis measurements to get a better idea.
If I could find a solution for the top octave, then I would probably be ok with the 808's.
use the 808's but add the Beyma CP25 Bi-radial horn that will cover the rest of the upper end. They say these match well with the Altecs and JBL's.
But if a true 2 way is what you want then maybe the 902's are the way to go!
Yeah, it seems like a few people are using the Beyma tweeters.
PE also as a lot of high efficiency compression drivers, perhaps one of those and a small horn lens would be OK.
Or I could see how the H812/D250P works as a tweeter before laying out any more cash.
The Daytons are nice sounding but I did experience something when I was evaluating those drivers. I was playing some Diana Krall and during the guitar solo I heard some break up from the guitar. At first I was like "wow, never heard that before" and thought the driver was just picking up something from the recording of the guitar amp breaking up. When I turn the volume down, the break up went away.
After I received the GPA 902's, I went back to the same recording and that break up was not there. So it turned out to be the Dayton D250P. This was Xover @ 1.5Khz so it should have been well within it's range of operation. This was a 1st order Xover that I was using with it. It could be that some compensation or different xover point could have fixed this. Other than that, I was happy with the sound of Dayton D250P just a thinner sounding CD compared to the GPA 902's.
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