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

Got new EP500 today and I am getting ultrasonic rumble on music even with the subsonic filter on. Have crossover set on 80 on the sub and on my amp. I have 2m22s up front with 2qs8s and the VP100 center soon to be the VP150 (on its way)

I asked on your other thread if you calibrated the sub to the other speakers, normally 75dB's? In other words, maybe you have the volume (gain) cranked to high.

Ya I have lowered it alot and calibrated to the best of my ability. I am having a problem boosting the 40Hz to 80Hz range when I try I get too much low end. The new design has no trim control (replaced with subsonic filter) And in the instructions it said to use the trim to boost that 40Hz to 80Hz (Instructions were for old design and need update)

Did you run frequency sweeps to verify this?

No I havent but my ears notice that hole in the sound. I have fine mid and high end and very low end. I am just assuming it 40 to 80 range. What do I have to do to boost that range if thats the problem? And the other thing I dont like about this new design is I have to turn on the subsonic filter when I listen to music. Being in a wheel chair and because where I have it means I have to yank it out to listen to music. What is the cut off of the subsonic filter? If I leave it on will I lose alot on movies? But regardless I need to know how to boost the 40 to 80Hz range

The "old" design is like having the sub-sonic filter off, so turn it off on the "new" design and you'll end up with the old. It is an additional cut off for LP rumbling (that you cannot really hear as it is below the physical capability of human ears except for newborn babies and even then) so you don't HAVE to have it on.

The fact that you lack some range mean you do not have the correct placement for your sub. Invite some friends and have them do the sub crawl (look into the video section on the "advice" secion of this site for more information on that).

Don't worry, it will get there in the end! It is not always easy to find proper placement for a sub.

Ya thats what I have been doing I was on the phone with JC yesturday when the instructions didnt have the update and he explained it so I have it off all the time but still the trim boosted the 40 to 80 hz signal when setting it to half or full how do I that now? Is turning off the filter the same as having the trim set to full? Well at least I dont have the low rumble I just had the volume all the way up and didnt notice. I am having a pro come over and configure everything correctly so if he says somethings wrong then I will worry if not then great

Your problem is most likely related to sub placement and/or listening position.

The sub is next to the TV on the floor pointed towards the listening area

Try it in different areas of the room. There is a nice trick that is well explained in Axiom's video (putting the sub where you will sit and you move around the room), but which might be a problem if you are in a wheelchair. That is why you might want to invite people over to get it down more easily.