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So I decided on a brand new model. I am testing it now and so very disappointed. When the mic is OFF, there is continuous static feedback (really loud continuous feedback). Only when I switch to MUTE then the feedback is gone. In ON mode, it works perfect when standing about 4-5 feet away from the receiver. When walking further there are feedback problems. Its the same issue whether I use one mic or both mics plugged in. I even tried both different types of cables, a 1/4" to unbalanced 1/4" jack, and 1/4" to balanced XLR to no avail. My mics frequency specs are 660.7 and 662.3 mhz.

You may be saying my mixer is not configured properly. Well, I've had it configured the same forever and am currently using a Nady Encore Duet wireless with it with hardly any feedback. The Nady's frequency are 206.35 and 212.2 mhz.

To further my testing I borrowed my brother's Shure SM58 single wireless mic @ frequency 615.9 mhz and it works flawessly. No continuous feedback on OFF mode, no feedback on ON mode no matter where I stand.

Are my AKG's defective?

Possibly. Every brand has their defective units. I would return it for either repair or replacement. I would not give up on it though as they are substantially better than the Nadys.

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The Line Array Experiment is over. Nothing to see here. Move along.

Just noticed that on the back of the AKG receiver, the 2 1/4" outputs say "balanced". Shouldn't it say "unbalanced"? My Nady's and the Shure both have 1/4" outputs and they both say "unbalanced".

That may not be defective mic but interference from other devices. I have the same mic and I had one of the channels with loud hissing squeaks, not all the time but in bursts. I thought it was defective and used a wired mic for the show.

Next time I tried it, the noise was gone. The gig where it happened was near the ocean so it's possible that some devices used in the area interfered. Make sure you try it somewhere else before thinking the mic is defective.

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Seize the day and SING!!!

someone who has these mics may be able to confirm this, but when the mic is turned off and getting noise, it may just be the squelch needs to be adjusted tighter in that area (interference like eben mentioned)
when walking away, is it feedback, or static? each one has a different cause.

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Paradigm Karaoke, The New Standard.......Shift Happens

Balanced outputs are preferred in most setups. If you are just using a 1/4" unbalanced (TS) to XLR, this COULD be the problem (though doubtful). If it was a balanced 1/4" (TRS) plug to XLR, this would be the proper cable.

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This is for home use only. I dont KJ. As for interference, if that was the case, then both of the Nady and Shure would get the same results but they dont. I even tried moving the receiver to different location but same issue.

this unit does not have a manual squelch adjuster, its automatic.

I thought all 1/4" plugs are unbalanced and all XLR's are balanced? Since this unit did not come with cables, I used the Nady's unbalanced 1/4" to 1/4". My mixer can accept both 1/4" and XLR but it doesnt say which is balanced or unbalanced. So I need a balanced 1/4" to either 1/4" or XLR? Does it matter if the 1/4" or XLR to the mixer needs to be balanced or unbalanced?

First of all, the problem you're experiencing is interference. When you turn off the mic, there is something else in the vicinity that is creating interference just strong enough for the receiver to pick up and break squelch. When you turn the mic on, the signal is far stronger and the receiver is able to discern that signal and accomodate the interference (even when it's in mute, the transmitter is still broadcasting). Nothing you can do about this, especially if you cannot locate the source of the interference. This is a problem that is inherent to systems that are not frequency agile.

As far as balanced lines, in all honesty a balanced signal can be carried over any 2 conductor wire (the third connector is actually the shield around the two conductors). Balanced just means that there are two signals being sent (one on each conductor) that are 180 degrees out of phase. More simply put, they are opposites to each other. This is what gives you the noise cancellation. Balanced cables are most commonly either XLR or 1/4" TRS (3 conductor "stereo" type plug). An unbalanced 1/4" cable would have just a TS plug (2 conductor) and there are unbalanced XLR cables where one pin (usually Pin 3) is not connected or is connected in parallel to to Pin 2.

If your mixer accepts a balanced 1/4" input (very likely it does), the easiest solution would be to get balanced 1/4" TRS cables. If it does not, then I'd recommend a TRS to XLR Male cable to make the connection. Either would work, just depends on your preference and what your console supports.

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DJ Tony
Let It Rip Karaoke

Do you think a balanced TRS to XLR will fix my issue?

No, from how you described it, your issue seems to be an RF (Radio Frequency) issue and has nothing to do with how your receiver is connected to the mixer. The only way to correct it would be to determine what is causeing the interference in the first place and eliminate it or get wireless mics that operate on a different frequency.

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DJ Tony
Let It Rip Karaoke

You are right. I just got balanced TRS to XLR cables and that didnt fix it =(

What can I do to eliminate the interference? And can you explain why the wireless Shure SM58 @ 615.9 mhz has no issues?

The Shure is obviously operating on a different frequency than the AKG's. RF interference will be frequency specific. This is why if you had mics that were frequency agile (i.e. can change to other channels) you could just change frequencies and not have an issue. Again no way to correct for this unless you can identify where the interference is coming from and eliminate that source. However, it's certainly conceivable that it's not something in your house that's causing the interference so you may simply be SOL.

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DJ Tony
Let It Rip Karaoke

it's a different frequency. even a few mHz can be the difference between clear and static. that is also why you did not have this issue with the nadys, totally different frequency. as far as fixing it, Tony said it, find what is alreeady using that frequency and eliminate it, or exchange them for a set on different frequencies. nothing you did wrong, nothing AKG did wrong, just luck of the draw you got a set on an occupied frequency in your neighborhood.

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Paradigm Karaoke, The New Standard.......Shift Happens

If I cant resovle this would anyone like to buy them off from me? I will sell it for 300 plus shipping.