[streaky]

I will soon start work on my sub cabinets for the Discovery but before I start I need to pick up some general hints about the box size.

I have inherited two 10" Rockford Subs that I want to use indivdiually in seperate cabinets...one each side of the car in side facing panels ... but the box size will be smaller than the reccomended cabinet size shown in the Rockford website.

I know 100% of nothing about porting and why it's done....so...........>>>
Is it possible to port an enclosure to help compensate for the reduced box size? Or am I barking up the wrong tree entirely?

Perhaps I should make the biggest cabinet size possible under the circumstances and then suck it and see?
The general idea is the same as our forum friend Braves has used on his Discovery but I will have a sub on both sides.

Any tips great fully accepted.

Thanks & regards.

S.

 

[Fish Chris]

Hello Streaky.

Is it possible to port an enclosure to help compensate for the reduced box size?

In fact, it's the opposite. Ported boxes require more space to begin with + a little more yet, to account for the volume lost to the port (unless the port is completly protruding, which will still work). If a small box is what you need, stick to sealed.

Peace,
Fish

 

[streaky]

Thanks Fish.

To conclude this short thread...I'm going to build the largest cabinets that the space permits and see how it goes.

I supose I should put some sort of damping stuff inside the box too right?
We can't get the proper stuff here in Dubai so should I buy a synthetic bed pillow and use the contents of that?

How much should I use? or is that trial and error?

Thx.

S.

 

[chad]

Hello Streaky.



In fact, it's the opposite. Ported boxes require more space to begin with + a little more yet, to account for the volume lost to the port (unless the port is completly protruding, which will still work). If a small box is what you need, stick to sealed.

Peace,
Fish

It depends on the driver, I vented the same enclosure I had as sealed and gained a boatload of sensitivity in the passband I was using it in

The correct answer is "sometimes" sometimes it works out, sometimes it does not.

 

[Fish Chris]

Hey Chad, I'm not doubting you.... It's just that every one of the 9,000 sub woofers I have seen, recommend about 1/3 more cubes for ported, than for sealed. Granted, what the factory recomends may not be what's best for your purposes... but anyway.

Peace,
Fish

 

[chad]

eh, it's more than 1 in 9000

BUT the sub I did it on said that a sealed enclosure of .4 would yield a QTc of .7 which is "ideal" this yielded a result equiv of a tooth-fairy fart in a hurricane. .7 offered lower extension so I rolled that. Then rolled it into a vented enclosure. .4 choked it back WAY too much.

 

[aznboi3644]

if the enclosure is too small for ported I wouldn't even try.

 

[chad]

But it never hurts to put it in modeling to see just exactly what "too small" may be

 

[89grand]

But it never hurts to put it in modeling to see just exactly what "too small" may be

Good point. When I built the little tube enclosure for the Tang Band neo 6.5 I tried to find a way to port it, but with only .25ft I couldn't get the port length anywhere near where it should have been. The best I could do for a port that actually fit the enclosure was to tune to 45hz plus it was only 1" in diameter and would have had an ass load of port noise, also the response looked real ****ty. At least I know though.

 

[bugmenot]

Stuffed my ported OEM sub box with filling from an old pillow used for moving furniture. Sound is tighter and reverberates better. Cost was free.

 

[streaky]

How much did you put in there? I wouldn't have a clue!

 

[bugmenot]

very dense
started by filling the cavity. close the box. kept stuffing into the port hole until i could stuff no more