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I haven't heard any buzz sound with my JH13 but I do hear some static noise when I adjust the volume. Here's what Jan told me
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Yes, this is normal behaviour. The volume is changed by switching electromechanical relais. During the switching within a few milliseconds the gain is first lowered and then set to the new gain again. This results is small "bleeps".
Enjoy!
Congrats on the Meier Combo..I'm loving them with my JH13's and HD800's
And that is one of the truly amazing things about the Concerto...powerful enough to drive my HD800s, T1s, and LCD-2s, but sensitive enough with ZERO noise floor to power my SE535s to incredible heights! One very versatile amp that sounds amazing with many headphones (maybe not the greatest with Grado's, but everything else I've thrown at it).
I read many reviews about concerto having ZERO noise floor even with iems..
but I'm not sure man, when I use my jh16 direct to the concerto with a 3.5mm to 6.3mm adaptor, I can hear some hiss when music is not playing and at normal listening volume.
Only when I plug in my JH16 into the concerto with an impedance adaptor(75ohms), then is the problem solved.
And even so, I still experience much bleep and "boom" noise which is so irritating and do not know how to solve.
I experience these bleep and boom noise when
1) When I plug the plug of the jh16 into the concerto
2) when the music is on go, without the change of the volume
Why can't the amp be totally slient when I plug in my earphone into it ?
Or is my concerto faulty ?
Any similar findings from JH16 users ? Cause in the end, the jh16 has impedance of 18ohms while the jh13 has 28ohms of impedance
But I am really satisfied with its sq man, luckily I took a step back away from balanced and decided to walk the full SE path..
EDIT: I checked my rca cables and its fine, so now its either my audio adaptor(3.5mm to 6.3mm) or the amp.. and i only got one adaptor =(.. time to go and buy one..