Brand new ag30 when I plug my mic sm58 into it all I get is static no sound as in singing comes through it I'm using a XLR to quarter brand new lead.. Have tried everything when I hit the tip of mic sound comes through but no voice comes through or extremely low volume voice comes through only..

Are you trying to use the mic input on the back or plugging it into the instrument input on the front? If you use a low impedance mic with a quarter inch instrument input cord, you would need a transformer adapter to make the mic work on high impedance. Even if you put it on line in, you would still have to convert it. Only the XLR socket on the back will work on a low impedance mic.

Greetings! Ok, your amp has an XLR (3-prong) Low-Impedance input on Channel 1 for a Mic. All the other inputs are 1/4" High Impedance inputs, which are for instruments and/or other High Impedance items including low quality High Impedance Microphones. The SM48S is a high quality Low Impedance microphone, so if you use it with a 1/4" plug, it will be in a High Impedance channel, and will be very LOW in volume in comparison with everything else. So, you must use an XLR (3 prong) cable from the Mic to the Channel 1 input on your amp. That will do the trick. Good Luck with your new amp and Mic!

I ASSUME that you plugged your guitar into a DI box that then used BALANCED XLR cable to the Mackie board??? The guitar generates line level and the Mackie board inputs are mostly mic level... you will get distortion if you overdrive the Mackie board. You could try going into line level jacks, HOWEVER if you go any distance balanced interconnects must be used. Even the line level jacks require using TRS balanced cables. Try is using a DI box, and preferably one with a gain switch. Also fiddle with the ground lift switch on it for least noise or hum. I use the LiveWire brand DI boxes and they seem to work fine. Then it is important to set the gain with the trim on the MAckie so you don't clip. Also be aware that an acoustic guitar can "hear" speakers and you can get feedback or regeneration that will sound like you are in a cave.

I have seen defective XLR cables so check it with an ohmmeter. It is possible the mic input preamp has been damaged. If that is the case, the unit will have to be repaired.

Things to check: You are using XLR mic cables... You have the speaker switch in the uppermost position A and B mains... the mute for that channel is off... For an SM58 the TRIM for that channel will be at about 3 o'clock to near full on, depending on vocalists voice strength... The CHANNEL fader will be at around -5 to 0 (75% up)... The MAIN fader will be around 50 to 80% depending on how big a room you are in. I assume the Peaveys are on separate channels IF they are 4 ohm speakers. The A and B outputs have a MINIMUM load of 4 ohms. With 4 ohm speakers you can get 400 Watts per side... about 250 Watts with 8 ohm speakers. DO NOT SET SPEAKERS to bridged mode... ALSO please read my tip on Fixya about a hazard of channel A polarity if you use 1/4 inch plugs on the ends at the speakers. The SLEEVE of channel A is the HOT, not the tip and grounding the sleeve can blow the channel A amp.

You should be using Dynamic mics such as a Shure SM58. They go into the first FOUR channels and if there is excessive gain and distortion, push in thee Pad button below the connector for those four channels. Inexpensive consumer microphones used with some Karaoke home systems are not suitable for this unit. You should be using XLR cables on the mics (balanced lines). The Pad buttons reduce the gain by a fixed amount of -20 Db for mics that have too much output to be controlled by the gain controls right above the connector. Ideally those should be no less than 12 o'cloock for good signala to noise ratio. Additional channels beyond the first four do not have as much gain and they do not have the -20 Db pad option.

The mics on the singing machine are very low end mics and MAY not work on your other unit. The Voco has very sensitvie inputs to use with "professional" type microphones. The Singing machine mics are going to be fairly high output and likely to overload the voco inputs. Procure some professional mics like Shure, AKG, Sennheiser or others and don't forget to use a balanced to unbalanced adapter or cable on the mics.

The music to sing along with apparently MUST come from a disk played on the unit. It appears that the external audio jacks are just to use the unit as either a boombox or to drive a larger sound system. You will have to convert your IPOD music into a Karaoke compatible CD to be able to sing along with it... They probably detect MIC input and mute any incoming signals from the RCA jack inputs,

This sounds bad... I suspect that a noise suppression cap on one side of the bad channel has shorted... possibly due to a static discharge.
Test for this doing this: Using a meter, with nothing plugged in and phantom on, check the voltage at both pins 2 and 3 to pin 1 of the XLR connectors. If you find either pin 2 or 3 is much lower than its mate (they both should be 15 volts to 48 volts positive), then one side noise filter cap probably has shorted. Unless you are electronically adept at repair, take it in for servicing.

Make sure the slider switch is set to the correct mode.

The TRIM controls must be advanced while the sliders are at 70%.

A common problem is to MISTAKENLY plug 1/3 inch input cable into the Effects Insert jacks instead of the inout IF you use 1.4 instead of XLR inout.

Make sure the channels of interest are NOT muted!