Making a new box w/o Thiele/Small info

[Zerstorer 10+ year member]

My budget *cough* subwoofers don't have any Thiele/Small information available for them.

The manufacturer lists this (per single 10" driver):

Sealed:

Good bass performance: .35 cubes

Better bass performance: .55 cubes

Best bass performance: .75 cubes

Ported:

Good bass performance: .75 cubes

3" round port x 8.62"

Better bass performance: 1 cube

3" round port x 7.62

Best bass performance: 1.25 cubes

3" round port x 6.875

I'm looking at two 10" drivers, unknown displacement. About 100 watts RMS to each.

I'd like to make a ported enclosure for my two subs, something tuned between 30 and 40hz. Anyone have any suggestions for box/port dimensions? Also, can anyone figure out what the suggested ported boxes are tuned at?

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[PV Audio 5,000+ posts]

um wtf? wtf is thiele? r these extremely cheap subs? cause theres no such thing as good performance vs bad performance bass wise....who makes these?

 

[Zerstorer 10+ year member]

um wtf? wtf is thiele? r these extremely cheap subs? cause theres no such thing as good performance vs bad performance bass wise....who makes these?

Thiele/Small.... the TS parameters. Perhaps its spelled Theile...

I think I'm pulling a newb and using the wrong term. If I am correct, the T/S info is stuff like the Fs, Re, QMS, Qes, Qts, Sd cm2, Vas, XMAX, SPL, etc

The brand of the sub is (shamefully) Dual, model XS-10 (manufacturer link )

 

[Zerstorer 10+ year member]

What model ... ?

The brand of the sub is (shamefully) Dual, model XS-10 (manufacturer link )

You posted too quick for me to reply the first time

 

[DBfan187 5,000+ posts]

um wtf? wtf is thiele? r these extremely cheap subs? cause theres no such thing as good performance vs bad performance bass wise....who makes these?

What a n00b...

To the thread starter:

As far as your box, your in good hands with Jmac. He's a god:angel:

 

[Zerstorer 10+ year member]

The 1.25 ft^3 one is tuned to ~40 Hz ...

My math yielded worse results... I came up with 300hz... somehow.

Anyway, what about the .75 cube one? or are they all roughly the same hz?

(my current thought is to do a 1.5 cube enclosure (.75x2) and make a plug so I can seal it or have it ported)

edit: they list a single round port, 3", but I'd like to make a slot port. area of a circle = piR^2, so do I need the area of the slot opening to equal ~7 inches, or 14 because I will have two drivers?

 

[Zerstorer 10+ year member]

1.25 ft^3 tuned to 40.983 Hz ...
I just guessed the first time //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Dang... and I used a Ti-83+ calc and still got it wrong!

Here are some numbers I came up with. These are internal dimensions with a little extra added to allow for sub displacement.

Box: 26x12x10 (essentially two chambers on either side of the port, each 12x12x10)

Port: 12x2x9

I'll add in my tuned @ guesstimate in a moment

 

[Zerstorer 10+ year member]

I use a Micronta EC-4014 ... I'd use my TI83+ but my parents stole it //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif
Anyways, since they're cheap, you might as well make them loud //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Big enclosure, tuned ~40 hz, say 20-25 in^2 of port area //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Here are some dimensions I came up with:

Box: 26x12x10 (essentially two chambers on either side of the port, each 12x12x10)

Port: 12x2x9

My math yields about 55hz from that design.... how should i modify the port to get it down to 40hz?

My best idea is 12x1x9 on the port... puts it at ~41 hz if I am right, but that's half your recommended port area...