Axiom Home Page Forums General Discussion Advice from Axiom Owners Axiom EP500 - Funny noises at 20Hz?

To any Axiom EP500 or EP600 owners,

I used the Realtraps sine waves to calibrate my Axiom EP500 (Great sub!). At 20Hz, there was an odd noise made by the subwoofer. It sounded like a loud click coming from the driver itself,and the click is synchronized with each driver excursion. I was 9 feet away from my subwoofer, and it was pretty noticeable. At 21Hz, the click disappears.

Is this something that's normal?

-Jin

No! Call Axiom!

The weird thing is that it disappears at 21Hz... If it was a driver problem, wouldn't it exist at 21Hz at the same volumes.

Like I said, at normal listening, I don't notice it at all.

Do you have any sub-capable headphones to ensure that it's not on the disc or in the processing by your preamp//receiver?

It wouldn't be the first time a manufacturer has been in a poorly-designed infrasonic or brick-wall filter...

I've used the same CD and have not noticed what you describe. I'd call Axiom.

For those who have used the realtraps cd with the 500 or 600... The cd has sine waves starting at 10 Hz. Where do you start to get noticable audio out of the sub?

For my 500, I get a little at 19 but mainly 20 Hz and up. This agrees with the spec on the unit, but just curious what others experiences are. I wanted to be sure my CD player wasn't limiting things.

Thanks.

Think I'll hijack the thread for just a moment.

Observation:

Five years ago everybody just had to have M3s'

Four years ago everyone just had to have M22s.

Since about three years ago everybody just had to have M60s(and a few M80s)

This year everybody wants an EP..........







(me too)
You can have your thread back now.

I'm curious about the Realtraps, I downloaded it also myself. Am I correct in saying that it is useless with my Denon 2805? I don't see where I can adjust the sub levels at various hertz?

Could be your CD has a scratch on that specific sector.

dllewel,

Mine does the same thing. Absolutely solid to 20, and not much at all below that.

Thanks GregBe!

Randy, the 1Hz increment tones are so you can plot the bass response curve for your room. You are right, most receivers don't let you EQ that finely. But you can experiment with the phase and placement of the sub(s). Also the Flat/Half/Full setting on the EP500/600. The goal is to get the most uniform (flat) frequency response out of your room.

It's not too fun to do the plotting of this graph manualy in 1 Hz increments. It takes a lot of time. Using 1/6 octave tones is easier, however less precise (but probably precise enough if you are doing all this manually).

Beyond these kind of adjustments, you can go the EQ route to flatten out any large peaks you may have with a BFD or similar type product. But it's best to EQ only after maximizing the placement of the sub first.

Have a good night everyone.