Pre-amp causing loud hiss from speakers


I have a BAT VK3i with Quicksilver Horn mono-blocks and Klipsch LaScala's. This setup is dead quiet, however when I recently hooked up Rogue Audio M-180 mono-blocks there was a loud hiss coming from the speakers well past the listening spot. This noise was constant even with the volume down to zero and occurred with either balanced or rca connectors.

When I took the BAT out of the equation there was now only a faint hiss coming from speakers but one had to put your ear to it to hear it. After disconnecting all components from the BAT and putting it back in - the noise returns. I tried a Conrad Johnson Classic and there was no noise.

So does anyone have any ideas as to why the BAK and Rogue Audios amps do not play nice together?

Thanks
Ag insider logo xs@2xdeadlift

Showing 6 responses by zd542

You shouldn't have a problem. I assume you are using your Rogues balanced. What kind of IC's do you have? You need to make sure they are internally balanced, and not SE with XLR connectors. Also, make sure you try both sets of binding posts on your amps. Pick the ones that sound best.
"05-27-15: Deadlift
I will experiment more with the IC's and binding posts,"

Just list your IC's. Someone here will know if they are balanced or not.

"05-27-15: Czarivey
can't you just proceed with unhappy return after half-hour of listening?"

I agree. Any good dealer will try to do something for you.
Well, I guess your run of the mill, 10 year old Transparent cables are probably internally balanced. Try new amps first and if they don't work out, you can always revisit the cable issue.
"BTW, FWIW, cabling, wires, cords, connectors., etc can have an effect on tone and clarity, but they do not create or reduce 'hiss'."

Yes they can and I can show you any time on my own system. Any time you start fooling with balanced and SE components and cables you can make a mistake and end up with a noise.
"This noise was constant even with the volume down to zero and occurred with either balanced or rca connectors."

The OP referred to the problem as a constant noise in the above quote. To me, that sounds like the problem may be something other than a hiss. Sometimes these type of problems are hard to explain in words, and that's why I recommended the OP check his cables.

"That is my experience. Your comments, without specificity anyway, baffle me, but I'm open to hearing about your experience when you encountered this issue in the past. And the techie stuff to explain it if you are aware. Thanks.............Perhaps we can all learn something."

Heres a specific example of a noise caused by improper cable selection in one of my systems. I have an Ayre V-5 which is balanced and a CJ Premiere 18 preamp that is SE. Sometimes I put the CJ in the system with the Ayre. If I use SE cables, I get a constant noise. When I use balanced cable, I don't get a noise. Just to be clear, the sound is a noise, not a hiss.

In my other system, I have a pair of Wilson's that are pretty efficient (94 is I remember correctly). I use a Wadia CD player going directly to the amp. In this system, I can get a hiss related to too much gain using the factory setting on my Wadia. In order to get rid of it, I need to go inside and lower the global gain with the dip switches Wadia puts there just for this purpose.

And that's it. Either way, noise or hiss, its just something I need to be aware of and know how to deal with it. As far as the techie stuff as to why this happens, I really don't know. I'm able to fix the problem and that's my main concern.
I checked on your IC's. They're fully balanced cables, so there's no need to go further with any checking. Unfortunately, it looks like your fix will be one of the more expensive solutions that some of the others have suggested. But I would still keep experimenting and definitely get in touch with your Rogue dealer. The longer you wait, the more permanent the sale will most likely become.