Cancelations?

[Honest Bob]

I was wondering if this setup might cause cancelations with identical boxes on each side.



http://www.nissanforums.com/showthread.php...=&threadid=9047

I thinks its a nice clean setup.

[The_Ancient]

I would think it would, at least to a certin extent,

your sound waves would look like this

<))))))))))))))) (((((((((((((((((>

so direct canellation..

but it would be worse if they were like this

(((((((((((((><))))))))))))))))

[Snausages01]

yea...what mike siad

but maybe move the amp and put another sub there and put the amp(s) on the other side and that would look cool.

[sandt38]

Run a "loading panel" right up the center of the trunk to reduce cancellation. Or, run one for either side like geo did, using some thick plexi. here is the link... http://www.geocities.com/geolemon/install-...first-civic.jpg

[Honest Bob]

Is that 3/4 plexi? How much does plexi that thick cost?

Where can I find some more info on loading panels?

[sandt38]

Originally posted by Honest Bob@Nov 20 2002, 08:09 PM
Is that 3/4 plexi? How much does plexi that thick cost?

Where can I find some more info on loading panels?

yes, 3/4...

http://www.mcmaster.com/ that is where you find the plexi...

Not much info, but I have used them with success. What do you want to know?

[Honest Bob]

I took a look at that site, and I found some .708" thick plexi with 9600psi tensile strength. I saw some thinner stuff with 10,000psi of tensile strength. Is that what it takes to bend the plexi ro break it in half?

I dont want this loading panel flexing right?
Does it muffle the sound making it boomy?
How far away should I put the loading panel?
How does it handle spl applications? SQ?

Thats all I can think of atm

[sandt38]

No, you don't want flex

Not at all. In fact, it allows the rebounding wave to blend well with the subwoofer wave, almost like acoustic coupleing.

No formula really, I suggest starting with 2 inches and play with it.

Due to the design you have in mind, you will benefit greatly in both SQ and SPL. As I mentioned, it acts like acoustic coupleing, making it louder. Also, it will work to reduce and hopefully completely eliminate both cancelling and standing waves, improving the SQ dramaticly.

I used a loader for my brahma to get metered and noticed a couple DB gain. It also had little bearing on SQ. However, my design was differant from your chosen design. I feel it will be beneficial to you in both SQ and SPL.

[Honest Bob]

Cool! I want to build at least one box this weekend. I should be able to get MDF at any lumber yard or home depot right?