Axiom Home Page Forums General Discussion Technical Questions EP600

HI, I just got my EP600 yesterday and i have a problem I've hooked it up and well it hum's I've check all connections I've moved to different wall outlets still just hum's.Any Ideas? My AV receiver is a Onkyo TX-NR906 I've connected it to or by RCA preamp sub out to EP600 XLR input jack.....thx for any help.

My EP350 hummed when I fist got it/him/her?. I removed a small screw near the power supply. Forgot what it's called. That stopped my hum. Some sort of grounding screw.

Hi Stu.D,
If you have a cable box or satellite receiver hooked up to your system it might be the source of your problem. Disconnect the RG6 cable feeding your cable/satellite box from the wall outlet. If the hum dies away then it is a ground loop issue. If you remove the sub cable from your EP600 does the hum stop?

Here is a link for helping you trouble shooting it - EP600 Trouble Shooting Guide

Don't hesitate to dial Axiom's toll free number (866-244-8796) if you need further assistance.

Good luck !

Hi Stu!

It sounds like you have a ground loop going on. There are a few real quick troubleshooting steps you can take.

1) Remove the ground screw on the amplifier at the rear of the sub. Does the hum go away?

2) Try a 3-2 prong adapter on the end of the subwoofers electrical cord. Does the hum go away?

3) If the answer to 1) is yes then disregard step 2) and your problem is solved. If step 1) does not solve the hum proceed to step 2). Does the hum go away?

4) If step 2 solves the hum then we have to proceed with some more troubleshooting on your setup to remove the ground loop without using the cheater plug. Ground loops are a common issue and can be solved with some patience and being methodical. It's not a flaw with the equipment.

thx all, the problem was the grounding screw i backed it off 5 turns turned it of and nice, no more hum.....thx for the quick responce.

I had a hum about a month ago, when I moved my 600 to my back wall, and put my 2 350's up front. Doesn't make sense if everything is grounded to 1 location, meaning the main ground rod in the ground near the electrical entrance.

I removed the ground screw on the 600 and it worked fine. UNTIL, I just got Direct TV and have an HD receiver down in my theater. The HDMI cable is plugged into and HDMI in on my Denon and the power plugged into my Triplite surge/conditioner. Anyway, I have a worse hum than I did before. The dish and coax are grounded to the same rod, so not sure what is going on. The only way to stop the hum is to unplug my HD DirectV , or I've found if I unplug my front subs from the Denon Preouts it goes away as well.

I hate hums/ground loop issues. What gives.

Good stuff Stu. Now crack open the bottle(s) of your choice and enjoy your Friday evening!

I hear that a constant hum is apparent after many years of marriage, and divorce is the cure.

Interesting how getting rid of the screwy part fixes both issues.

Well earned:

And remember, Cam, only in Canada are camo-patterned, vertical blinds called draperies.

Canada? No. We are not much into the military theme. When Cam travels to Cuba that is a different story. Sorry, he won't cross over to the US.

I forgot to include "hunter camo-patterned..."

See, I ruined my own f'joke. I don't usually have to bother, as there a plenty of people here to do that for me.

It's not our fault when you're not funny.

If you only knew! You would become a Canadian citizen so you could travel to Cuba with Cam. Wheelz likes to role play as Che. If only those camo patterned blinds could talk.

Well Cam, if my ex was a screwy part she would have at least had that going for her. Unfortunately she was just nasty...

That might become my new sig line.

Or a track on the next Negative Orange album.

Of course not. It's my fault for not including a Wikipedia link imbedded in each post so you guys could "get it."

Back on track, any ideas on eliminating the buzz in my speakers since I introduced Direct TV. I watched the installer do a top notch job grounding everything to the exterior ground rod that was already existing to our electrical house connection?

Yes,
Use the following device from Radio Shack to connect your sunbwoofer to your receiver. Use only one, either both whites or both reds.
Ground Loop Isolaor

This will help with the buzzing coming from all the speakers? I see some people have reviews that said it reduced bass response in the sub. My system was absolutely dead silent until introducing Directv.

Randy, from what you've described it appears that the front subs and the satellite aren't grounded at the same spot, and that's forming a loop. Using cheater plugs on one or both of the front subs would be a quick fix until the trouble with the satellite was hopefully corrected by them. The sub amp chassis would be ungrounded if the screw was removed. The screw would connect the chassis to the shield of the sub cable and provide a somewhat effective chassis ground through that route.

Make sure the grounding screws that Direct TV put on are really tight.

I will check the work outside tomorrow..All my audio equipment is plugged into a decent Tripplite Surge unit on the same circuit that feeds the theater room as the subs are plugged into, not the same exact outlet. From what I've read you can have two pieces of equipment with 3 prong (grounded) outlets on the same circuit, but the loop forms when you connect those two with another cable, which is also acting as a ground.

The HD receiver only has a two prong plug, so not sure if that is part of the problem. I need to play with some things but as soon as I unplug the HDMI cable to my receiver, the noise goes away, or if I unplug my front subs from the receiver.

I thought of your divorce as soon as I started tying that .

Hey, Cam! The Bunny Ranch is still months away. Don't hurt yourself in eager anticipation.

Randy,
I had ground loop hum issues and the only thing that would fix it was running a wire between chasis of receiver, ground screw on sub, chasis screws on any/all other equipment. This wire just needs to be small 18 guage. I guess this equilized all grounds. All I know is it made my system dead silent and did not hurt bass output. I had made up some test wires with gator clips to find problem. All of this equipment was powered from same circuit through a surge protector.

LOL!

Not sure how I would do that with the 350s, first they don't have a ground screw, and they are in the actual theater room. The rest of the equipment is in the AV closet.

This is how I 'solved' my subs' hum problem. It all eminates from my Cable TV connection - disconnect it from my system & it disappears; however, of course I can't operate that way.

http://www.axiomaudio.com/boards/ubbthre...true#Post357488

I still have to wiggle the surge protector power bar plug in the wall socket to make sure that the ground contact is perfect to eliminate the hum completely. Ground loops are very finicky....

Tom
Comox, BC

for me this is not just my sub, it is my entire system, but I'm sure related. hope to try a little troubleshooting tonight.

I have everything run through my Panamax, cable,Tv,telephone,prepro,amp,subs and Oppo. No noise, which is very good and one plug.

Its just your friendly neighborhood poltergeist humming a few songs for you.