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Then you don't have the volume on the Shure receiver set high enough. Have you tried setting that?

Also, where are your compressor knobs set? Midrange? Are the EQ knobs all midrange? Do you plug the wired mic into the same channel and get good output?

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[color=#ffff55]Mickey J.[/color]
Alas for those who never sing, but die with all their music in them.
-- Oliver Wendell Holmes, Sr.

Ok there is a green light & red light on the receiver, is the red light being lit to where it's always on or is it on rare occasion blinking. The green light should be pretty constant as a signal is going in. If the red light is doing any more than a steady blink, then back off the volume on the receiver.
Also in the mic itself there is a little audio level control switch, change the position & see if that helps the squeal and or muffled issue.
Also what cord are you using between the receiver & mixer? XLR-XLR, XLR-1/4", 1/4"-1/4"??? This CAN make a difference.

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Thanks Mcky. Let me start with your last question. Yes, I tried switching each mic to the channel that the other was running through. Nothing changes. The volume control on the receiver is maxed out. Compressors are basically the same, at 6. The EQ's are all close to 7.

I don't know why you want to boost them. They should be all midrange to begin with, except low EQ should be at about 2.5 or so.

That being said, now I wonder if your microphone is set at the right frequency. Or as Lonman said, if the volume pot on the mic itself is set properly.

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[color=#ffff55]Mickey J.[/color]
Alas for those who never sing, but die with all their music in them.
-- Oliver Wendell Holmes, Sr.

Havnt read the whole thread for continuity but here are the basics for wireless mics.

With the mic cupped turn the squelch up above the threshold where you have noise. Then turn down to the point where it is gone.

With the preamp trimmer set at 12 to 1 oclock set the gain for normal. If the mic has an internal gain, set the receiver gain midway and adjust internal for normal.

Any receiver has an automatic gain control (AGC) which puts the receiver at max gain with no signal inbput. Any powered mic is prone to feedback and esp if pointed back at speakers.In that case run the gains lower than normal.

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Start off with turning the compressors off. Full counterclockwise.
Now turn ALL eq's straight up to 12 oclock.
All effects off for now.

On the gain on the mixer channel, there is a little shaded section about 10 oclock. Start you mic channels there. For the wired mic, on the channel fader bring it up to unity (O mark) - NOT the main volume fader. Keep talking loudly (not scream) into the mic until you see the little "peak" light on the mixer channel start to blink, then back the gain down a notch.
Before turning up the wireless on the mixer, talk into the wireless loudly (again not screaming) until the little red light on the receiver starts blinking, then back down a notch. Now do the same on the mixer as you did for the wired. See what that does. Don't adjust any eq or effects yet.

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I can turn the gain down, there are no controls on either receiver (unless it is inside the panel somewhere) other than the "volume" knob. I don't see a squelch on my mixer. Here is the owner's manual---http://www.shure.com/stellent/groups/public/@gms_gmi_web_ug/documents/web_resource/us_pro_l-series_ug.pdf

Basically, the wired mic is about half the volume or output coming out of the speakers vs the radio shack wired mic. It is also somewhat muffled.

Aha. You aren't using an XLR cable, are you?

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[color=#ffff55]Mickey J.[/color]
Alas for those who never sing, but die with all their music in them.
-- Oliver Wendell Holmes, Sr.

Lonman, I will have to try that tomorrow, stayed up late watched the Vikes humble the Bears. Thanks for your help.

I bet you are using a 1/4" to XLR "Hi-Z" cable. I have seen this behavior before -- the cheap mic works at a decent level, the pro mics are muffled.

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[color=#ffff55]Mickey J.[/color]
Alas for those who never sing, but die with all their music in them.
-- Oliver Wendell Holmes, Sr.

Lonman, I tried following your directions to a tee. Not seeing any difference. However I couldn't get the peak light to come on as I was adjusting the gain and talking loudly. I'm assuming you meant for me to turn the gain up and not the channel fader. I can press down the PFL switch and watch the peak meter on the right side. With the wired mic, I had very loud volume and finally feedback before I could get the meter in the yellow. With the wireless I tried the same thing but still muffled and still not loud. I also had effect knobs all the way counter clockwise and all eqs on 12 o clock.

Mcky actually it is a 1/4 to the mixer and XLR female to the receiver.

I think Micky is onto something. Here's something you might want to try. If you are going into the line jack with your Mic on your mixer instead of the XLR Mic input I think you will find that the Line input has a built in pad incorporated into it, reducing your gain somewhere close to 30db. I think if you come out of the back of your L4 with a traditional XLR to XLR cable, and plug that into the XLR Mic input of your mixer I think you will notice a difference.

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Quickness of mind will deceive the eye

with a wireless mic a xlr to xlr cable will solve your problem.

Exactly. Get an XLR-->XLR cable and I bet everything will be fine.

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[color=#ffff55]Mickey J.[/color]
Alas for those who never sing, but die with all their music in them.
-- Oliver Wendell Holmes, Sr.

Okay, I'm no pro but I'm going to give this a shot. I think the cable issue might make a difference also. If you read the manual it says that the 1/4 inch output on your receiver is unbalanced, not as good as the XLR. I can't explain all the tech stuff, I have a friend who helps me with this stuff for my DJ business so I just trust him. He owns his own Live PA sound business, has been involved for many years and has a degree in this stuff. I just know unbalanced lines are not the best way to go because they can pick up interference. Read page nine in your mixers manual to understand this, or maybe some one else can explain this for you in more technical terms if you need. Get the XLR/XLR cable, it's just better and you want the best when it comes to this stuff if you're going to make some money at this, and it's not like we're talking $1500 speakers versus $500 speakers, it's a ten-twenty dollar cable. I always buy them a little longer so I can use them in other places in my system if need be.
There's the little button labeled 80 right under your gain knob, make sure it's depressed on your mic channels as it cuts frequencies below 80 Hz which helps feedback. Your mixer has compression knobs, so read pages twelve and thirteen as this also has to do with your feedback issues and maybe why you can't get the volume out of your wireless mic. Once again maybe someone else can explain this better, I've never used a compressor before. My buddy has taught me how to properly set up and eq my mixer so every mic is even sounding and feed back is just about nil except for issues beyond my control i.e. people walking right in front of the speakers when told not to. Unfortunately no matter how many times he explains this I still don't understand the complexities of how it all works, I just know the steps to take to make it work so I can't really explain to well.
I don't know if you bought this brand new or not but on page five of the online manual it tells you how to adjust the audio gain on your hand held unit and also talks about the squelch adjustment. Maybe some one changed it previous to your owning this if you bought it used? It describes that it might be set on low if the audio peak light never lights, maybe this is part of it and you need to switch it to high.
Hope this might have helped point you in the right direction.
Sincerely,
Darryl Miller
The Party Starters
P.S. I also saw that it's a vhf band which I think might cause interference between due to television bands. Read here:

http://www.sweetwater.com/shop/live-sou ... -guide.php

How do I get to the volume pot on the mic?