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[Luke Geis]

I think the biggest issue is with gain structure. I prefer to run the phones level high in order to limit the amount of level that can be achieved if there is an accidental turn up and it can also help reduce the noise floor.

[Guy Morris]

I used my G3 at a gig last night (and will again each night thru Sat) and I had no noticeable noise in my system - with the xmitter turned on.
As I stated above, there IS low-level hiss when only the receiver is on, but as soon as any source is xmitted, then that hiss is not a factor in what I hear.

Perhaps the settings are the cause, but I did gain-stage it properly and unlike Luke Geis comments above, do not run the receiver hot.. it gets LOUD real fast. But yes, sensitivity levels probably affect that - IIRC, mine is set pretty low (I'll have to get values tonight) and report back.

+ 1 on this.  Just listening to the receiver BP with nothing sent as a mix  there is a low level 'hiss' (for the sake of a better description) but this is completely masked by any program  being sent. At first I thought it was to do with the BP volume gain position but from 0 to 80% it is constant level only increasing marginally if turned to maximum. I could not get the background noise to improve with any of the settings discussed it is just there however it appears worse with some IEM buds than others. The generic Sennheiser ones that come with the system show up the worst but the Shure and Westone ones do not  seem anywhere near as prominent making me think that IEM drivers may play apart in accentuating the background noise? Interestingly only musicians who did not have their own buds and were using the Senny ones commented they could hear a background 'hiss' or as one said which I can understand what he means now after investigation it sounded like a mic was open somwhere picking up background atmosphere!  ( that was not the case but it was an interesting observation!)

[Willy Arteagoitia]

Not sure about the OP, but just to clarify, the rf noise (whoosing, changing background noise) is not what I'm speaking of. It's the constant background hiss that's there at all times, at any volume setting on the receiver, with the transmitter on or off.

The weakening RF signal that you experience as you move around can be alleviated in many ways. The constant background hiss can only be alleviated by less-sensitive ear buds or a passive inline pad between the receiver and ear buds.

I have noticed the same hiss noise floor in my Sennheiser receiver EW 300 IEM G2, I think ist´s something relative with type of phones you are using and their impedance, with a 250 OHM Beyerdinamic DT 770 pro the hiss disappears and you need to turn the volume very high to heard the signal properly, but with less impedance in ear buds like Shure SE535 with 32 OHM the Hiss is very high, even with the transmitter off and minimum volume on the body pack. It's something about the noise-signal ratio and the sensitivity of the phones.
Andrew , if you are yet by here,  is there any way to put and intermediate wire that get higher the impedance of the headphones? I have read  in one of your posts something about a passive inline pad between the receiver and ear buds.

[Mac Kerr]

I have noticed the same hiss noise floor in my Sennheiser receiver EW 300 IEM G2,

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