I got a used Behringer B1 from ebay few days ago . since it came i bought xenyx 302 and 502 to check if there is some problem with my microphone . the Sound volume just doesn't go much high . in fact in the start when i plug it starts with loud ( i guess it would be the normal) . and as i speak the first thing into it the sound goes down to a minimum . if i crank up the volume on the mixer , the hum is greater then what i record. my cheap dynamic microphone sounds much better and loud then it. i dont know what might be wrong with it .