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Faint speaker hiss

Was wondering if anyone here might be able to help me out. I recently acquired a new naim integrated (XS2) to pair with my Harbeth p3esr. I am using straightwire speaker cables which I've had for years. I noticed when I plugged everything in that the speakers have the ever so slightest hiss coming from them. I cannot hear it unless I get extremely close to to tweeter and te sound becomes non-existent once music starts playing. I have had the amp for about a week now and have kept it on 24/7. Does anyone know where the small hiss could be coming from? I tried different speaker cables/power cord and that didn't change anything. I also tried unplugging all my sources and left just the amp and speakers plugged in ad still had the faint hiss. Like I said, it's not audible unless I really get my ear close to the tweeter (about 3 inches). I might be nit picking but was wondering if anyone has had experience like this before? Should I try a different outlet? I am in an apartment so only have one or two places to put everything. Any help would be greatly appreciated. Thanks!
mgrec42
rotaryphone
159 posts
 
They almost all do. I never had a speaker/system that was completely silent. But Can't hear a thing if my ear is few inches away. 
gdhal's avatar
gdhal
1,641 posts
 
While as others have stated the "hiss" is normal, there is something to keep in mind/try. The hiss should only get so "audible" and then cranking the volume further clockwise should NOT increase the volume of the hiss. Usually the volume of the hiss maxes out around the 12 O’clock position. If the hiss continues to get louder as you crank the volume I’m pretty sure this would not be considered normal.

Something else to try. RCA shorting plugs on the unused inputs of the amp. Can’t hurt and could help.

And yet something else.... gee I've learned so much from this forum over the years :).... the efficiency of your speakers do play a role. The more efficient they are, the more hiss you will (or could) hear.
mgrec42 OP
12 posts
 
Sorry for a late response but I appreciate all the feedback! I thought I should mention too based off some responses that no, the hiss does not get worse with more volume. It is a minor constant sound that goes away once music is played. The speakers I have are inefficient to say the least (83 db)  I did do a quick a/b with an old pair of paradigms that are around 90 db and yea the hiss was more audible but still nothing dramatic. As others have stated, it really shouldn't be a worry as it is so minor but this is a lot of money for me and I just wanted to make sure there wasn't a stupid mistake on my part that could have been causing it. Thank you all so much for the feedback 
gdhal's avatar
gdhal
1,641 posts
 
It is a minor constant sound that goes away once music is played.

You're welcome. Note, however, that the hiss doesn't "go away". It's simply masked by the relatively much louder music. Hence the hiss is simply one component of your systems overall "noise floor".
selman's avatar
selman
13 posts
 
Hi mgreg42.
This is great question that I also want to learn answers..
1-Try unplug all rca inputs(source or preamp isn’t connected) & Short your rca inputs of your amplifier.
If you hear a noise from your speakers it should be the noise floor(SNR=signal to noise ratio) of your amplifier..
I do not know unshielded speaker magnets can cause a hiss or not..
2-Try to play an empty(no music in it) flac or cd file from your system.You can find the file on internet.(google it).I also have the file in my computer.If you can’t find I can send it to you.
You said noise is gone when music is starts.Check the 2nd it really diseappers or not.

If when music starts noise is gone it is probably normal.Because when nothing is playing some source equipments shorts its outputs automatically any possible noise can get pass to amp is eliminated automatically.
Even output shorted some noise can leak to your amp..

There are some amplifiers with fancy S/N
like the benchmark ahb2 like 132db.

Reall issue here we don’t listen speakers like sea shell but we want to be SURE the hiss noise is really normal or not..
This is my first post in here..
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