donh

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About donh

  1. Thanks, you rock, i went out and got Monster xlr to 1/4 and it worked perfect no more hum thanks again
  2. Thanks, I know you guys are trying to help but I really need a Crown Techs help I already had my cables tested by my Crown service center. He hooked my cables up to his equipment and they worked perfectly he said there was nothing wrong with them, and they are shielded and grounded. You are saying you are adding a RCA so you are not balanced any more(remember i said most problem are coming from those type of connection), you also said as soon as you plugged the xlr cable you do have a hum i don't know but if was me the cable would end up in the round can, testing the cable by it self doesn't mean anything the cable can test fine but you are adding a RCA adapter can induce hum. i still do not understand why you are using RCA adapter, your mixer doesn't have balanced output? What model of mixer you have i looked at denon web site and all 3 mixers have XLR output. If you are using RCA adapter you may consider this http://www.rolls.com/product.php?pid=MB15 to match level difference between unbalanced to balance level of pro gear. XLR=Balanced 1/4 cable (TRS)= balanced RCA=unbalanced Its a Denon Dn-X120 it has unbalanced rca and balanced 1/4 inputs, the guy at the Crown service center used his own balanced cable xlr to 1/4 and it still did it, when I first got my amp I used 2 Hosa XLR M to RCA F adaptor and regular red and white rca's for almost a year without any problems at all, I am gonna go get balanced cables right now and I will let you know if it works or not.
  3. Thanks, I know you guys are trying to help but I really need a Crown Techs help I already had my cables tested by my Crown service center. He hooked my cables up to his equipment and they worked perfectly he said there was nothing wrong with them, and they are shielded and grounded.
  4. Start from basic, plug only the speakers to the amp check for hum, just plug one item at the time and check for again and so on until you have hum. Why are you running balanced to unbalanced to balanced again??? most of problem are coming from those type of connections. Please list your equipment will be easier to help you out. Crown Xti 4000, (2)JBL jrx115, Hosa xlr to rca, pro co power plus neutrik speakon connectors, if I hook up just my speakers to my amp it does not hum with the volume up, but once I connect an xlr cable it starts to hum like it has a back feed, I guess it is balanced to balanced but I have to add a rca to 1/4 adapter so I can hook it up to the balanced input on my Denon mixer, once I hook it up to my mixer it is not as loud and it goes away completely when it is hooked up to my computer sound card. Even when I picked up my amp from the service center I showed the guy what it was doing and he got his own balanced to balanced cable and it still did it , you dont have to touch the connector you can just touch the cable and it will get louder, and I have tried every single way to hook it up and can't fix it
  5. Hi, I have a loud hum coming out of my speakers, I just got my amp back from a service center and they said they could not find anything wrong with it. I am running Hosa xlr to rca, then rca to 1/4 which goes to balanced into my mixer. I have had my amp for almost a year and did not have a problem at all with the way I have it hooked up now. I have a Denon turntable and hooked my amp directly to the turntable and bypassed everything and the hum is so loud I cant go past the second notch on the volume control of the amp. I have changed mixers, cables, and connectors, and I even had my new cables tested and there was nothing wrong with them. The weird thing is if I hook my amp up to a reciver and then hook my computer to the reciver or the amp directly to my computer it does not hum at all, but if I unhook my computer I cant get rid of the hum, and if I hook a speaker up to a channel and connect an xlr that goes to nothing it will hum when I turn the amp up. I know about balanced and unbalanced could cause this but like I said I have ran it this way for almost a year with no problems. I dont know what is wrong. Would appreciate any help thanks. I even factory rest it and reinstalled latest firmware.