echo in the box!

[deepanger]

hi ,ive just build asmall enclosure for 2cheap subs (paralleled to form a 4ohm load) , the enclosure is about 35Litre in vol.
and the 2subs are 8" each 15watt.. its working as a pc sub.

the prob. is i hear a small bass notes related to the main ones..
its sounds like an echo..not low as the main bass notes, no its
higher in pitch and in concidence with the main bass as i said..
so whats the prob. in here? need abigger enclosure or??

thanks all..

 

[roddyama]

DA,

We need more info.

Is it a sealed enclosure?
What are some of your construction details?
Did you use any stuffing?
What speakers are you using?

 

[deepanger]

ya its asealed one, about the speakers its no brand ithink ,theyre
two of those cheapo ones with 15watt 8ohm each..
and no stuffing i currently use.

tell me if uneed any more info.

 

[roddyama]

Hi DA,

Since it appears that you're going the economical route, here are a few cheap suggestions.

Glue (and screw) bracing in all the corners inside the boxes.
Glue (and screw) bracing across the walls inside the boxes.
Staple a thin 1/4" layer of heavy foam or rubber (like a cheap door mat) on the rear and opposite walls of the inside of the box.
stuff the boxes with dacron pillow stuffing. Use a material like "cheese cloth" around the back of the speaker to keep fibers out of the workings.

That will cure some of your problems, but you're probably getting good old fashion bass doubling (high harmonic distortion) from a cheap speaker.