Low buzzing through speaks


Hello All,

 

Need some serious help here. So I just (upgraded?) from a Marantz AV8802A to a McIntosh MX122 preamp. I also just got brand new Revel Performa3 speaks all around (5 channel setup). I disconnect everything from the Marantz and then into the McIntosh, connect the speaks and I have a faint buzzing through all 5 speakers (that was not there previously). I have everything plugged into a Furman Elite 20pfi power conditioner which is plugged into a dedicated 20 amp circuit. My power amp is a Simaudio Titan HT200 5 channel. This is not going through the Furman but directly into the other outlet on the same 20 amp line. I even tried plugging the Sim amp into the Furman to see if that helped-no change faint buzz is still there. I have unplugged just about everything, and the buzz is still there. It is very faint and does not get louder when I turn up the volume. Again it is faint and you have to put your ear up to the speaks to hear but it is definitely there. I have tried so many things and nothing gets rid of it. It is not my cable box (I did have that issue previously with the Marantz but as soon as I unplugged the coax from the box it went away so I just bought a coax loop eliminator connected the cable to that and noise was all gone) as I unplugged that and started there.

 

Any help would be so sincerely appreciated????

kingbr

LED light somewhere in the room, either a 5v or an LED of certain type bulb in traditional socket. Unplug it. See if that is it. 

Good point @markmoskow. If it already isn't the case @kingbr, try turning off all lighting in your place, and see if this makes a difference. I also agree with @dilatante. There are sometimes trade-offs in the audio world. In your situation, you will probably be *slightly* compromising the performance of the Transparent's when inserting any other device in them (like the attenuators or XLR shield lifters). Only you can decide what you want to live with. If this was my setup, at some point I would have shorted pins 2 & 3 on one of the XLR cables (at the female end, while plugged into the Sim), to see how much of this is being picked up by the cable alone. 

Agree with @dpop as it will be tradeoffs because you will be compromising the signal purity thus overall sonic fidelity (sound quality) everytime you insert something in the signal path. 

 

@kingbr 

I wouldn't get any XLR attenuator or any sort in the signal chain because you will be compromising the overall sound quality of your system slightly. Just leave it the way it is since the faint buzz is only noticeable from like couple inches away from the speakers anyway and has no impact on overall sound. Don't sweat it. 

So it would appear switching to RCS’s won’t make any difference, no?

The RCAs will be 3db down from the XLR connections. 3db might be enough to knock down the hiss a bit. 

But I would just keep using the XLR balanced interconnects throughout especially if your gears are fully balanced design or true differential design internally. I don’t know if your Mac and Sim are true differential design or fully balanced design internally, but if they were, you will be better off using XLR cables throughout as it would sound better than using RCA single ended cables. it’s quieter (lower noise floor) when using XLR cables if your gears are fully balanced design or true differential design internally.

 

FYI, not all gears that provide XLR connectivity are fully balanced design or true differential design internally. Some are single ended design internally although they provide XLR connectivity (outputs & inputs). Marantz multi-channel power amps and their preamp surround processors are single ended design internally but they provide XLR balanced connectivity (inputs & outputs). So if your gears aren’t fully balanced design or true differential design design internally you can use RCA single ended interconnects and would sound the same whether you’re using RCA or XLR, or you would probably be better off using RCA in this case, unless if you're running long interconnects then use XLR cables.