Video: noise floor and tweeter hiss, what do you think?

robert1976

Thank You for posting the link and trouble-shooting your system.

Happy Listening!

Thank you, 😁

@ramon74 turns out there’s nothing to fix. I can’t hear it at the listening position so it’s not an issue. It’s normal, even in ultra high-end equipment. 

Hiss is normal and fine ! it's the signal to noise ratio!  that number is a better indicator if one is worried and  if nothing is reaching the chair your golden.

Hello Robert! I have a Nagra Classic pre, a Essence amp, high sensitivity speakers and I have hiss too :).

Of course I have more hiss if I turn on the 12db gais switch of the Nagra XD.

Did you fix your hiss?

thanks!!!

Thanks for the link to the article @russ69 

My speakers are 94dB sensitivity. Combined with 49dB gain may very well be responsible for the hiss.

I do us a Puritan mains filter and good cabling, so I do not suspect the problem lies there.

XLR or RCA but in a lot of applications the RCA has less gain so unless you have a long run an RCA cable will help a little compared to XLRs. A 10db attenuator usually is enough but each system is different. As long as you can’t hear it from your listening chair you are good. I’ve only used RCA attenuators but your link looks fine. To be more specific, it’s the gain, the noise floor, plus loudspeaker efficiency that are the things that add up to the noise level at the speaker.

A Discussion About Idle Hiss – Upscale Audio

"... by putting an attenuator on the cable going into the amp"

Thanks for chiming in @russ69. Are you referring to the XLR (or RCA) cable? What does such an attenuator look like? Any links or pics you could share?

Would something like this work, or do we need audiophile grade?

FYI, the Gryphon pre + power has +49dB gain, the D’Agostino Momentum +59dB.

P.S. I switched my DAC between 0.6v, 2v and 6v; no difference. Disconnecting the DAC also makes no difference.

Simple answer. This idle noise or hiss is usually from the pre-amp or amp having high gain. This can be knocked down by putting an attenuator on the cable going into the amp. All my systems are dead quiet and only a couple of times have I had to attenuate the signal.