No hidden switches I'm afraid. The RE20 is always going to be a bit quieter than an SM58. One possibility would be to use an outboard preamp and connect into the aux input on the mixer.

I use a Shure SM58 mic and even that doesn't get great volume. I have to max out everything and it's still not enough volume in some cases. I think it's because of the impedance mismatch (511 Ohms vs. 150?). Does anyone recommend a certain type of microphone to work well with the 57 without an impedance transformer?

I actually had the same issue with using an SM58 with my 57, and started using a cheap ass Audio-Technica ATR30 instead. Surprisingly, the levels are great, and it sounds pretty damn amazing on a big system. Mic design is good and rugged, too.

Hard to believe, but I'm serious.
www.radioshack.com

wow Im surprised you guys are cranking the vol on the 57 for the mic. I use a sm58 and have to keep the mic volume at 2 or it gets too loud.

I had shitty Mic volume while using a crappy XLR to 1/4 inch adapter. I bought a cable thats XLR on one side and 1/4 inch on the other and all is well now.

Now its like ben where more than 2 on the mic volume is too much.

lol cmos, I made my own using a 4 conductor twisted pair cable xlr to 1/4" TRS

I followed neutrik's wiring specifications =)

you need phantom power to a studio mic and another thing when you recording just alittle 101 alway record low then after compress the recording if you record to high and peak then you recording will be crappy sounding good luck bro,and any way the 58 is a great performance mic if you want great sounding sound clip DO IT IN A BOOTH

I had a problem with the SM58 being too low, and a few other older Shure dynamic mics. I solved it by getting a CloudLifter CL-1 pre-amp, which uses Phantom Power as a power source to give you +25dB gain. It was annoying to have to buy more gear, but I've never had a problem with dynamic mics being too low, so it was worth the $175 or whatever it cost back then. There is a new model with impedance adjustment knob that lets you adjust the sound of the mic but that's probably more than you're looking for (CL-Z / CL-Zi). There is also a knockoff of this called the FetHead that I've never used, but since I'm advocating the use of a phantom powered mic preamp for noise-free gain, I might as well make sure I'm not endorsing one brand, or you might think I work for them.

Actually, I just saw that this DJ Mixer doesn't have Phantom power out to mics, so nevermind that last post.