biglaz Posted December 22, 2009 Share Posted December 22, 2009 My system has developed a buzzing sound coming out of my high frequency driver/horn. System uses active crossover and three amps. The buzz is only in high freq section. It is one volume, doesn't turn up or down. Any help! Quote Link to comment Share on other sites More sharing options...
DrWho Posted December 22, 2009 Share Posted December 22, 2009 Is the amp you use for the HF the same as the one you use for the LF? If not, then you might have a ground loop. If they're the same, then my next guess would be a bad cable or something along those lines. Does unplugging the input cable to the HF amp get rid of the buzz? Quote Link to comment Share on other sites More sharing options...
biglaz Posted December 22, 2009 Author Share Posted December 22, 2009 Different amps. I will try unplugging inputs and report back. Quote Link to comment Share on other sites More sharing options...
biglaz Posted December 23, 2009 Author Share Posted December 23, 2009 The problem was a bad cable. PITA to track down, but got it. Thanks for your suggestions. Quote Link to comment Share on other sites More sharing options...
DrWho Posted December 23, 2009 Share Posted December 23, 2009 Were you able to replace the bad cable and no more buzz? Quote Link to comment Share on other sites More sharing options...
biglaz Posted December 23, 2009 Author Share Posted December 23, 2009 Yes. I change cable and the buzz dissappeared. Quote Link to comment Share on other sites More sharing options...
deafbykhorns Posted December 23, 2009 Share Posted December 23, 2009 What amp are you using on the HF? Quote Link to comment Share on other sites More sharing options...
biglaz Posted December 24, 2009 Author Share Posted December 24, 2009 I do not have anything fancy, but it does work. I always have a little hiss from the compression drivers but it is very, very low. I use the amp section of a Harmon Kardon 3485 stereo receiver rated at 100 watts RMS. A little overkill but, I do not have anything smaller at this time. The mids are powered with a Hafler 120 and the bass section is powered with a Rockford Fosgate stereo amp, 250 watts RMS @ 8ohms. A Behringer active xover CX3400, crossover points - 500 and 7000, and an Audio Control 10 band EQ. Speakers consist of: Highs - Emminence APT 150 Mids - Electrovoice DH1a 2" driver with 90x40 CD horn Bass - 5cuft Vented cabinet with an Emminence Kappa Pro 15lf tuned to 35hz. Quote Link to comment Share on other sites More sharing options...
DrWho Posted December 24, 2009 Share Posted December 24, 2009 Have you ever tried running your system 2-way? the DH1A is easilygood to 18kHz after CD EQ. Which 90x40 CD horn are you running? Sounds like a pretty nice setup. Is your rockford fosgate a car audio amp, or something they did special for home audio? I'm glad it turned out to just be a cable...that's probably one of the easiest things to fix once it's been identified as such. Quote Link to comment Share on other sites More sharing options...
biglaz Posted December 24, 2009 Author Share Posted December 24, 2009 [8-|]The amp was something I picked up at a sale of discontinued stereo equipment about 20 years ago. It has been serviced once since then. I am attaching a file for your info. Yes I am thinking of going 2 way. I had it set up that way and decided to try a super tweeter. I actually think the EV driver sounds better without a super tweeter. The horn is from Parts Express. It is a Goldwood GM-450PB for $49.25 each and they sound just great. Actually I think I am going to change it back to two way over the holidays. RF2000_amp_man.pdf Quote Link to comment Share on other sites More sharing options...
DrWho Posted December 24, 2009 Share Posted December 24, 2009 Dang, that amp is pretty oldschool / hardcore. How does it sound? That manual looks like it was written by an engineer [] Ya, the DH1A is a pretty awesome driver. I wouldn't be surprised if it could keep up with the APT-150.http://archives.telex.com/archives/EV/Drivers/EDS/DH1A%20EDS.pdf How do you dial your system in? By ear? I was noticing the Behringer CD EQ comes real close to offsetting the plane wave response of the EV driver. Quote Link to comment Share on other sites More sharing options...
biglaz Posted December 25, 2009 Author Share Posted December 25, 2009 I have only used the Rockford amp for the low end for the last many years (sic). It will pound the poop out of the bass system. Back when I did private DJ work I would bridge it and drive up to 4 EV 18" subs without ever clipping. I set up all my systems by ear and experience. Seems to work. I also do not have any measuring equipment. Quote Link to comment Share on other sites More sharing options...
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