DIY Subwoofers - General Discussion

**sub_junkie** · **10-05-09, 07:12 PM**

It does't exactly mean there is something wrong with the EP2500. It could just be a ground loop issue in your house wiring, etc... They can have you try many different things, and get you back up and running in no time.

**ccdoggy** · **10-06-09, 12:38 PM**

if you disconnect the input cable and it is still there then it is a problem with either the EP2300 or the power connection.

If it goes away when you disconnect the cable then there is a loop between your amp and receiver. what i have done in the past is take a wire and connect the chassis of both devices together to virtually eliminate it. i took a spare RCA plug and connected it to another output on my receiver (having soldered a wire to the shield) then running the wire to my amp and using a spade connector connected it by a screw to the chassis. that got rid of 85% of it for me.

**goonstopher** · **10-06-09, 01:26 PM**

How can that be? a couple other amps in subs worked fine in the same outlet with the same cable. When the cable it taken out the amp does not detect a signal and does not hum, with the b1 in chain the amp makes a hum but slightly less when the cable is connect and again none without the cables.

Would plugging the sub into the same wall outlet as the receiver possibly take care of it? Would a transformer of some kind be an option?

If you do it the manual way you mentioned how do you ground it? Is it just meant to electronically couple the devices? I would prefer an easy fix so i don't mess it up.

**ccdoggy** · **10-08-09, 11:03 AM**

Quote:

goonstopher wrote:

Would plugging the sub into the same wall outlet as the receiver possibly take care of it? Would a transformer of some kind be an option?

If you do it the manual way you mentioned how do you ground it? Is it just meant to electronically couple the devices? I would prefer an easy fix so i don't mess it up.

Yes, plugging into the same outlet as the other devices may get rid of it because it would litmit the amount of potential for current to flow through the ground on the signal cable. a transformer would also take care of it but would kill your low end response (i tried one).

All that happens when connecting the chassis of the devices is connecting the grounds on all of them to make that ground loop to flow across the wire you just added instead of the signal cable.

I have found that the EP2500 is sensitive when it comes to ground loops, maybe it has a little ussue with grounding or something (not an expert) but i found this helped a bit. its not hard at all to test. just take a piece of wire and hold one end (stripped) against the ground of one of the input RCAs and hold the other end on the bare part of metal on the ep2500.

It may or may not work in your case, just worked a bit for me.

**goonstopher** · **10-08-09, 11:34 AM**

Sorry to sound stupid but what is the ground on the RCA?

**ccdoggy** · **10-08-09, 01:56 PM**

Quote:

goonstopher wrote:

Sorry to sound stupid but what is the ground on the RCA?

its the external round connection. the positive is the inside part.

**goonstopher** · **10-08-09, 02:23 PM**

The guys at elemental designs suggested a jensen transformer for the coaxial cable to the cable box.

**ccdoggy** · **10-08-09, 10:49 PM**

if disconnecting the cable connections fixes it then go for it.

**annunaki** · **10-10-09, 10:45 AM**

What type of connections are you currently using?

I had a similar issue with mine. It was a cable/connection issue.

I was using a coaxial type RCA to a 1/4" adaptor. I had a fair amount of noise. I was also getting noise with my A500 using coaxial type RCA's direct to the RCA input.

I made my own RCA to XLR adaptors using a twisted pair RCA that had a ground/drain wire. After introducing this new sub cable the noise was gone.

I subsequently did the same for the A500, and again the noise disappeared.

I have all of the amplifiers on the same grounded circuit as well (this was done before the cable fix with no results). I was running into similar situations to your own.

I suggest trying a different cable option to start. It may correct any issues you are having.

**goonstopher** · **10-10-09, 10:50 AM**

Im going to try some things soon. Making my own adapter seems over my head. I am using the stupid rca/1/4 adapter

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