Question about Sennheiser ew 300 IEM G3 In-Ear Wireless Monitor System

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I feel that the 'normal' background hiss is a problem that I would like to minimize with the sennheiser IEM 300. I'm currently using the IE 4 ear phones. Would a different/better earset with maybe a slightly higher impedance help reduce the hiss? Note: The background hiss in question is that with the transmitter off and the receiver volume set to minimum. Thanks Brian

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No, that will not help. The his is a function of the receiver NOT receiving a signal from the transmitter as they apparently do NOT have a "squelch" circuit to mute the receiver noise when no signal is being received. The noise level when no signal is received is pretty high and apparently the volume control is not enough to reduce the hiss.

To solve this, LEAVE the transmitter ON and make yourself a switch at the receiver. DO this using one of those little in line lamp switches that fit on zip cord. Make one on a short length of zip cor with mating connectors to fit the received jack and the headphone plug. Don't worry about unshielded wire as the impedance is very low. Then you use this switch to mute the headphones when you want to. There are other switch types you can use, I am just suggesting what might be readily available to you.

Sennheiser SHOULD have include a mute switch on their unit as turning the power off on the receiver would be a pain. They could have used a volume control with switch to kill the audio line out... simple solution... oversight on their part.

Posted on Mar 25, 2011

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To get your transmitter out of mute press the standby button and hold it briefly until "RF Mute Off" appears. Your display should change from red to orange and the transition icon will also be displayed again. This indicates your transmitter is transmitting.
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It looks like the mute function is only available from the menu... not very user friendly at all... I guess they figure the performer doesn't need to mute easily or quickly... Volume control I suspect is all that is readily availab;le at the pack to quickly mute.

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There is not enough info here to provide a complete answer, but let me give you some background:

There will always be some hiss. This is due to general amplification where a small amount of noise is amplified along with the general signal. In most cases, the signal is strong enough to overpower any noise that is present (vocals in your example). This noise should not be that noticable in normal cases. If there is an automatic gain control in the line, this could account for it as with "silent" times, the gain will automatically be increased potentially to the degree where the noise is noticable.

Barring that scenerio, if the input signal is too low, the overall gain necessary to produce reasonable volume at the speakers will also be such that the noise is noticable. In order to track this down, please provide details about the current setup including:

1) Microphone make and model being used
2) Input being used on the mixer
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Some Headphones have an inherent hiss noise when they are connected to my wireless sennheiser EK 300 IEM G3 receiver. It seems to be a problem particularly with high-end IEMs which are highly sensitive...


Hiss is a problem of statistical noise in electronic devices due to the laws of physics plus circuit design.

One thing to do is to improve the signal to noise ratio (SNR) by properly setting gains. It is POSSIBLE that the IEM's you are using are too low impedance for the receivers resulting in you having to use excessive gain at the receiver. Your receiver gain control should not have to be above 60% of the way up. If you are above that, the ear buds are probably lower impedance than the receiver is designed for... and remember the manufacturer will LIE on the capability of the thing they are trying to sell.

The receiver is speced at 32 ohm drive... IF your ear buds are less than that impedance, they are NOT suitable. Conversely if they are too high, thaat will ALSO cause you to turn up the receiver gain too much and result in poor SNR.

You want to make sure the transmitter is being driven at line level so receivers get adequate input audio so gain doesn't have to be run too high.

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IF YOU CAN, go to a music store and COMPARE the amp to yours at the same setting with NOTHING plugged in. (cables and guitars can generate hiss or other noise themselves).

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MAKE SURE all power to this and ALL the other connected equipment come from a single receptacle to avoid ground loops.

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