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Hiss at addition in system LAMM L2

Hiss (noise) from speakers at addition in system LAMM L2.

Three weeks ago, I have bought preliminary amplifier L2 reference
Improvement in sounding all system was huge!!!! The overall dynamics and scale of the music!!!
Illusion of a presence(finding) in a concert hall has appeared.

But I am disturbed with the following:
At addition in system L2 strong enough noise (hiss) has appeared from
speakers. At inclusion of toggle-switch MUTE hissing disappears, at deenergizing
Toggle-switch MUTE all room is filled with noise (hiss).
Even at listening music on silent passes or piano music
Such noise level it is normal or L2 demands repair?
anton9005
c5vette's avatar
c5vette
8 posts
 
I've had both the LL2 DLX & currently the L2 Reference! I'm using it with Lamm ML1's & Wadia 861 cdp. Connected with Nordost Vahalla balanced IC's & Klipschorns! If any system should have hiss this should be the one "dead quiet"!! Considering 581ise.
tvad
9,467 posts
 
Today, I tried connecting the L2 Reference to my Pass Labs XA-60.5 amps using
the L2's single ended outputs with XLR/RCA adapters. I am still using the Pass
Labs' balanced inputs. I find the sound to be more natural this way. Less
mechanical. I don't discern any additional noise or hiss as a result. In fact, it
may be even quieter.

I did not expect this result, and I'm wondering if any other L2 Reference owners
who run the preamp balanced have tried this experiment.

Does the L2 Reference's signal pass through additional circuitry to convert it to
balanced?

Based on what I hear today, I am likely to convert my interconnects to
RCA>XLR cables thereby eliminating the adapters.
jburidan
672 posts
 
Has anyone solved the hiss issue?
madfloyd
411 posts
 
I would like to know this too.
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