CAKE Posted July 11, 2011 Share Posted July 11, 2011 I am sure there are 10,000 posts on buzz and hum here, but I was hoping to get a quick comment here. I took advantage of the wife being out of town over the weekend to do a little tinkering because I could. I have wired my Cornwalls and LaScala together and driving them with a QSC RMX 2450 (750 watts @ 4 ohms /stereo) and the buzz from the tweeters is audible from 5 feet. Normally with either the Corns or LS, same amp (500w @ 8 ohms) the buzz is barely audible at 6" from the tweeters. The question is: as the load changes does the "noise" increase - decrease and should I expect to have more buzz at 4 ohms & 750 watts and even more noise at 2ohms / 1200w ? PS: she didn't flip when she saw what I had done, and she hasn't asked me to take it down (yet)... GOD I love her! 1 Quote Link to comment Share on other sites More sharing options...
CAKE Posted July 13, 2011 Author Share Posted July 13, 2011 Thanks everyone. I found that the buzz is related to the HDMI and is accented by running the QSC in 4 ohm. If anyone that sees this can answer does higher wattage, lower ohms result in more noise. I sure many are wondering why Im pushing 700 watts thru 2 pair of horn loaded speakers_ because I can! and I like to experiment 1 Quote Link to comment Share on other sites More sharing options...
Moderators dtel Posted July 13, 2011 Moderators Share Posted July 13, 2011 I don't know the answer about about the noise. But if you like to experiment maby try disconnecting the midrange and tweeter on the Cornwall and just use the bass, that would be interesting. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted July 13, 2011 Share Posted July 13, 2011 I wasn't ignoring you, I have no idea[:S], You've also doubled your tweeters compared to what you had originally which I suppose would make the problem worse. Quote Link to comment Share on other sites More sharing options...
biglaz Posted July 13, 2011 Share Posted July 13, 2011 Have you tried lowering the gain on the QSC? Quote Link to comment Share on other sites More sharing options...
CAKE Posted July 14, 2011 Author Share Posted July 14, 2011 Thanks for the suggestions, I will tinker later. I like the idea of running only the Corn 15"_that would make this a CornScala on steroids _ 2 woofers and K400 horn. I better take the art off the walls! CECAA850, I notice you have QSC 1104s_ do those have fans and are they noisy, have you sourced quiter replacement fans. The fan noise makes this amp impossible to listen at low levels to normal levels.....Cant wait to get the MC250 back from the shop with new caps and upgrades 1 Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted July 14, 2011 Share Posted July 14, 2011 I replaced the fans on all my amps and used 2 more of the same fans in the cabinet that the amps are in. 6 fans running all the time, they're barely noticeable when the volume is off and can't be heard at the lowest of volumes or even over conversation. I'd have to do some looking but I think they were Enlobal Enermax???? or something like that. They're bearingless (sleeveless) fans that are extremely quiet. Let me try to find a link. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted July 14, 2011 Share Posted July 14, 2011 THIS is the brand. You'll need to check the size (I think they were 80 mm) and voltage (12v????) before you order. I'm going off memory so double check everything. EDIT, SEE BELOW POST. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted July 14, 2011 Share Posted July 14, 2011 I just remembered. The Enermax fans went in my Crowns, sorry[:$]. I'll need to get my old paperwork out to find out what I put in my QSC's. I got to looking at the pic I posted and noticed that I gave you bad info in the above post. I DO have the Enermax fans in my cabinet but I think that I put Panamax in the QSC's. The Crowns were 12v and the QSC's (and Behringers) are 24v (I believe[:S]). Quote Link to comment Share on other sites More sharing options...
CAKE Posted July 14, 2011 Author Share Posted July 14, 2011 Well from a "buzz" post to a fan noise post. Heck its all noise related When I researched before I'm sure the QSC fans were 24v - 80 mm. But with so many options I put that project on hold. I didn't want to replace 1 noisy fan for another noisy fan. Since I moved the amp down to be bottom "where all the dust is" the fan noise isn't so bad, but Im sure I will regret when I pop the cover to clean! 1 Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted July 14, 2011 Share Posted July 14, 2011 I'm relitively certain I used THESE. Quote Link to comment Share on other sites More sharing options...
WeebMan Posted July 19, 2011 Share Posted July 19, 2011 Relative certainty. I like it. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted July 19, 2011 Share Posted July 19, 2011 Virtually positive? Quote Link to comment Share on other sites More sharing options...
CAKE Posted July 19, 2011 Author Share Posted July 19, 2011 Splendadly annoying 1 Quote Link to comment Share on other sites More sharing options...
WeebMan Posted July 19, 2011 Share Posted July 19, 2011 Department of redundancy department. Quote Link to comment Share on other sites More sharing options...
Mighty Favog Posted July 21, 2011 Share Posted July 21, 2011 Accidently on purpose.... Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted July 21, 2011 Share Posted July 21, 2011 Accidently on purpose.... 10 yard penalty on the Mighty Favog for piling on. Quote Link to comment Share on other sites More sharing options...
Mighty Favog Posted July 21, 2011 Share Posted July 21, 2011 Accidently on purpose.... 10 yard penalty on the Mighty Favog for piling on. For "ruffing" the poster?? LOLOL!! Quote Link to comment Share on other sites More sharing options...
WeebMan Posted July 21, 2011 Share Posted July 21, 2011 *excessively loud whistle* Unklipschmanlike conduct! Quote Link to comment Share on other sites More sharing options...
CAKE Posted July 21, 2011 Author Share Posted July 21, 2011 LOL and chuckling too...2 penalties in 1 thread Hope no one gets banned over this! Nothing to see here, moderators just move along..... Thanks CECAA850 for the link on the repalcement fan, that is now back on the front burner 1 Quote Link to comment Share on other sites More sharing options...
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