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I purchased a Behringer EP1500 amp a couple months ago to run my 15" Avalanche sub but I haven't actually played it since my sub wasn't done yet. I had planned on changing out the fan with a quieter one but it turns out it had a different connector than the one I had bought. Refer to this thread for more details.
Bottom line is I think I have a problem with this amp.:M I am getting a ton of hum when I turn up the volume and from doing some reading it's reminiscent of what I would imagine a ground loop would sound like. When I turn up the volume on the amp the hum gets louder and I hear very little of the actual music that I should be hearing. I have tried running it bridged and single channel on both of the inputs and it's the same thing each time. I went out and bought a plug converter thingy that goes from the 3 prong to 2 prong and that completely eliminated the hum when I ran it through my surge protector. I however didn't gain any actual volume when I was playing music. I tried plugging it into another outlet (the original outlet I tested it on) and even with the 2 prong plug I was getting massive hum. This is the same outlet that I had my previous sub plugged into (Dayton 10" powered sub) and I never had any of the problems with hum.
When I had it opened I really didn't fiddle around with anything since the fan I was going to use to replace the stock fan with wasn't going to fit. The only thing that changed from when I first opened it is that I moved the wire that was running from the side of the circuit board to the fan.
Image not available
Black wire is pointed out by the yellow arrow, green line is the original path of the wire. Is it possible that I'm picking up some feedback between this wire and the inputs that are right beside it?
When I put everything back together I hooked this wire back up like it was before I took the cover off. Since I have had problems I reopened the case to see if any wires had pulled loose and everything seems to be in order. The only place I can think of that I could possibly think of that might be causing a problem (other than simply having a bad amp) is the RCA to 1/4" connector although I doubt that's the problem. I am probably going to try and make a warranty claim on it unless there is something easy that I'm missing that I could easily fix. The only problems I see with this is the fact that I've actually opened up the case (this voids the warranty according to the manual...DOH!) and that I'm passed the 45 day return from the place I bought it. The amp does have a 1 year warranty on it assuming I didn't screw myself by opening the thing up.
On a side note...the Avalanche 15" is truly amazing.:T I have it running off the amp from my 10" dayton (~100 Watts) and this thing puts out what I would consider to be an incredible amount of bass considering how much power I'm feeding it. I was watching U-571 and I discovered that I'm going to have to do a little rattle elminating once I get this thing fully operational. I really can't imagine what it's going to be like once I actually get a full 1200 watts pumping through it. :E
Bottom line is I think I have a problem with this amp.:M I am getting a ton of hum when I turn up the volume and from doing some reading it's reminiscent of what I would imagine a ground loop would sound like. When I turn up the volume on the amp the hum gets louder and I hear very little of the actual music that I should be hearing. I have tried running it bridged and single channel on both of the inputs and it's the same thing each time. I went out and bought a plug converter thingy that goes from the 3 prong to 2 prong and that completely eliminated the hum when I ran it through my surge protector. I however didn't gain any actual volume when I was playing music. I tried plugging it into another outlet (the original outlet I tested it on) and even with the 2 prong plug I was getting massive hum. This is the same outlet that I had my previous sub plugged into (Dayton 10" powered sub) and I never had any of the problems with hum.
When I had it opened I really didn't fiddle around with anything since the fan I was going to use to replace the stock fan with wasn't going to fit. The only thing that changed from when I first opened it is that I moved the wire that was running from the side of the circuit board to the fan.
Image not available
Black wire is pointed out by the yellow arrow, green line is the original path of the wire. Is it possible that I'm picking up some feedback between this wire and the inputs that are right beside it?
When I put everything back together I hooked this wire back up like it was before I took the cover off. Since I have had problems I reopened the case to see if any wires had pulled loose and everything seems to be in order. The only place I can think of that I could possibly think of that might be causing a problem (other than simply having a bad amp) is the RCA to 1/4" connector although I doubt that's the problem. I am probably going to try and make a warranty claim on it unless there is something easy that I'm missing that I could easily fix. The only problems I see with this is the fact that I've actually opened up the case (this voids the warranty according to the manual...DOH!) and that I'm passed the 45 day return from the place I bought it. The amp does have a 1 year warranty on it assuming I didn't screw myself by opening the thing up.
On a side note...the Avalanche 15" is truly amazing.:T I have it running off the amp from my 10" dayton (~100 Watts) and this thing puts out what I would consider to be an incredible amount of bass considering how much power I'm feeding it. I was watching U-571 and I discovered that I'm going to have to do a little rattle elminating once I get this thing fully operational. I really can't imagine what it's going to be like once I actually get a full 1200 watts pumping through it. :E
ops: ) .I like to think of myself as knowing a good deal about audio stuff and I feel like I'm pretty good at following instructions and reading directions yada yada yada. The thing still isn't working like I think it should. :M I've tried about every dip switch combination I can think of that would make sense and then tried the direct opposite of all of those combinations trying to take into account what Thomas said about things being backwards. I took some pics of the back of my amp so hopefully if I'm doing something wrong you guys can help me better with some pictoral evidence.
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