Axiom Home Page Forums General Discussion Home Theater Changes to EP500?

I just got my new EP500 today really nice sub. I noticed the trim knob is gone when I downloaded the manual it had a trim adjustment on the back of the EP500 is this a different design? This one does not just curious.

Its strange the directions have a picture of the back of my new sub with out the trim control yet it still says to set the trim to flat as though it still had it. And it does not explain the new switch (subsonic filter) which was not on the downloaded manual or mine. The number on the picture of the new switch in the instructions is the trim control not the subsonic filter.

so I guess my question is what is the subsonic filter switch? It does not say anything about it in the instructions the instructions called it the trim and to set it at flat.

The subsonic filter is a high-pass filter. It cuts the lowest parts of the audio spectrum. I don't know what frequency Axiom picked for theirs though (15 Hz?).

Quite a few recordings have noise in the very low bass range. It isn't meant to be there, but it wasn't filtered out of the master because no one heard it on the studio monitors. Now that subs are reaching the infrasonic (proper term, as subsonic means slower than the speed of sound, while infrasonic means below the hearing threshold) range people are starting to notice this low-end noise.

EDIT: It's also useful for people who still use mechanical pickup mechanisms for playback which are liable to generate infrasonic rumble.

The one in the EP800 is at 20hz, so it is likely that their other DSP subs that go around 16-17hz also have it now.

I called them it was a design change they took out the trim controls on all of them now and replaced it with a subsonic filter which I am going to leave off unless I hear a hum. He said to just leave off for movies.

Well I am getting that rumble I then turned the filter on and still get it. AH crap new problems. Any suggestions.

Not sure what your saying by "rumble"? Have you calibrated the sub to the other speakers?

Well maybe its not actually a rumble from that low end noise but its something on didnt have on the EP175. Its a low end noise none the less but its not on movies. Its when I play music and only during some parts of the song like its going to low.And I dont hear it during live recordings thats why I thinks it that subsonic noise that is on alot of recordings but that filter is suppose to stop that and mine is not(if thats the problem) When you say calibrate do you mean the channel level I tried but I am not that good yet I am bringing in a pro once I get my new center either Monday or Tuesday so I will wait til he comes before I say I have a problem unless someone has something easy to try should the volume always be up all the way on a sub? And my crossover is set at 80 on the sub and the A/v as per the instructions for the new design (No trim control now)

Through that break-less paragraph, you seem to be asking if the volume should always be all the way up on a sub.

If that is the question, then the answer is NO, especially for a sub THAT powerful as the EP500. You need to calibrate the sub using an SPL meter so the dial matches the speaker (which is likely to be about 20-30% MAX of the dial).