Ok here are the details I have a Behringer xm8500 which is a low impedance microphone with an xlr output. Now my Reciever Amp is a Technical pro Rx-B33 It has 2 1/4" mic input jacks. At first I had an xlr to 1/4" trs adapter hooked to a xlr cable and then plugged in. This resulted in a very very quiet mic. I contacted Behringer and they just said it might be the adapter. So I ordered an xlr to 1/4" mono microphone cable. Will this work or will I be required to purchase a preamp? Keep in mind that this reciever amp was built for karaoke and is supposed to have an intigrated amp/equalizer in it for the mics. Thankyou