(Eton woofer problem) Speakers almost done, but bass sounds boomy

[Jimmy154]

Looks like I'm almost done with my speakers, but the bass sound strange. I don't know if I should start over with a new box.

The speakers are mb quart MCD-25 tweeters and Eton 8-800 (37 Hex maybe?) in about .8-.9 cu. ft. box. I'm not too sure about the volume cause it's filled with a sand-roofing cement mix on the inside. The bass sounds like a bad port, around 120 Hz I think, but I'm not sure.

Is the box too small? Should have a Qts (or is it Qtc?) of about .65. Are these woofers bad in a sealed box or a smallish sealed box? Some one else mentioned they thought their Eton 372 woofers were in too small a box and sounded bad. I don't think it's the room, but that would be easy to check. I was also thinking the polyfil I got was too dense and took some out, but I don't think it helped. Any one know what the problem might be?

[Jimmy154]

pic

[sqlkev]

from what i gather in bassbox pro..
in a sealed box of 17.5L ~.6cube (i think) the F3 should be 71.46hz
boominess is usually from the result of high qtc (smaller enclosure size)
so that may not be ur case..

maybe ur box isn't well sealed and it's leaking somewhere??

[Jimmy154]

Originally posted by sqlkev

maybe ur box isn't well sealed and it's leaking somewhere??

Yes, that is probably the case, but I did not think a poorly sealed box would cause boominess. I thought it wouldn't matter cause I heard about the thor subwoofer the guy (sorry don't remember name) put a hole in his sub on purpose. And one other person has told me this. So if I seal the enclosure better it will help?

[sqlkev]

I believe some people make a hole through the cone to reduce some resonances...but I've never tested that out....

the boominess can sometimes be the vibrations...
did you use any sealant to close the airgap from the basket to the baffle??
that would help as well

[Jimmy154]

I wasn't referring to a hole in the cone but in the enclosure.

I used ice guard roofing rubber stuff or something like that. It is very sticky but might not work well. I will put in some foam wheather stipping tomorrow and see what happens.

[sqlkev]

Originally posted by Jimmy154
I wasn't referring to a hole in the cone but in the enclosure.

I don't think I've ever seen anyone did that.
Usually it would either be a sealed enclosure, or a ported one. (Open back and others don't count)

[Mark25]

getting them up off the floor will make a lot of difference.

i find the difference between the stand and chair in this image makes all the difference to this setup.
M.

[phase_accurate]

Corners always make the sound boomy, be it between floor and wall or between two walls.

Lift them at ear-height, away from the corners, and the boomyness will most probably be gone.

Regards

Charles

[Geenius]

Are the drivers run-in? Usually after a few weeks of playing the bass should become tighter and more detailed.