Axiom Home Page Forums General Discussion Technical Questions Ultrasonic rumble on music with EP500

Guy, I was surprised to learn that the current EP500s don't have the Trim adjustment, since the information on the site still shows it and I found it to be quite useful in the locations that I tried for my EP500. I wouldn't have praised it to you in a previous reply if I'd known this.

The subsonic filter has nothing to do with what Trim did previously. I understand that the earlier EP500s such as mine had a fixed subsonic filter at about 18Hz. Now that filter can be selected or not on the latest versions. Making it optional isn't related in any apparent way to the boost which the Trim adjustment gave in the second octave of bass from about 40-80Hz.

You mentioned the manual parametric equalizer on your 772 as a possible solution, but in looking at the 772 manual I see(pp.62-63)that the 772 isn't one of the receivers where the equalization can be applied to the subwoofer channel. So, if your room does in fact make a mid-bass boost desirable this can't do it.

Well living with it for a week now I still think I have a problem with my sub or the amp. The stand bye mode quit working completely on the sherwood so there is some kind of problem there. The thing is its in a small bedroom I should not have to turn the volume past 12 to even see the driver moving with me right next to it. And if I crank it too high it distorts with that rumbling. It should blow that little bedroom away but it doesnt at all. I have the sub on bypass and all my xovers set at 80hz on the amp. I am going to try a diff amp to see. They told me it isnt a diff design just a modification and to just turn the filter off and it is the old design whjich I dont get because I HAVE NO TRIM to adjust.

Look, just because they removed a switch and replaced it with a straight through connection, (thereby making it permanently on the default) it doesn't mean they changed the core design of the amp.

Look,I really dont care if its a new design or not I am just saying I have a problem. It is not normal to have to turn the volume up past 12 o clock on the EP500 on everything just to get the driver moving and to hear it. And this is in a small bedroom with me right next to the sub. Its either the sub itself or the amp. That EP500 should blow that little bedroom away right? I welcome your input though, thanks.

Have you tried a different cable?

Hey Guy,

Sorry you're having problems. I've had a similar issue with my EP350 when I got it back in Jan this year. I've always felt "something just wasn't right". I've always had to turn my sub volume knob to 80% and receiver is set to +3.

Placement was a huge issue for me and I was experiencing some cancellation of low freq. But even then I thought it should put it out more. So much so, that I run 2 subs (an old JBL 10"). Even now with just the JBL 100watt 10" sub, losing the EP350 hasn't made that much of a difference.

Well, yesterday the amp finally went out completely. One call to Axiom and a new replacement amp is on the way. I'm really curious to see if the new amp puts out more. I hope the EP350 becomes more of a performer with the new amp and I don't have to crank the volume to 80% to even hear it perform. Who knows? I'll find out in a week or so...

I know you have your sub in a small room, but make sure you experiment with moving your sub around, if you can. You might be experiencing some cancellation.

Dana