For $500 or less, is it worth building? - Page 2 - AVS Forum
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post #31 of 42 Old 07-18-2014, 01:43 PM - Thread Starter
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I can't do 2 unfortunately, believe i would if i could.

How big of a box would I need for a 12" Infinity ported? Small, but ported and decent ouput. It seems that the Infinity works well in smaller boxes.
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post #32 of 42 Old 07-18-2014, 01:56 PM
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Quote:
Originally Posted by 04rex View Post
I can't do 2 unfortunately, believe i would if i could.

How big of a box would I need for a 12" Infinity ported? Small, but ported and decent ouput. It seems that the Infinity works well in smaller boxes.
The 12" Infinity actually likes a larger box, around 4 ft3 for HT sub duty. If you want a tiny 12" ported sub the RSS315HO is a good choice. 16" x 20" x 18" with a 4" x 32" port. The same applies as the last sub with using a PVC elbow fitting. This will get you a 2 ft3 22 hz tuned box. This sub would have about 2 db more output then the previous UM10 sub above 20 hz, both with 500 watts. The UM10 sub would have a flatter response down to 16 hz though.
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post #33 of 42 Old 07-18-2014, 02:06 PM - Thread Starter
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That box size is actually pretty close to the SVS SB-1000. Interesting. So 16Wx20Hx18D.
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post #34 of 42 Old 07-18-2014, 03:04 PM
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That box size is actually pretty close to the SVS SB-1000. Interesting. So 16Wx20Hx18D.
Yes. But you can move that around if you want and it wont affect anything as in 16Hx18Wx20D is exactly the same thing. Having the smaller numbers for W x D gets you a smaller foot print of course.
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post #35 of 42 Old 07-18-2014, 03:24 PM
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What would be the smallest box dimensions i would need to build, lets say an Ultimax 10" ported, while still giving good output and going as low as possible? Amp wise, i guess i can put anywhere from 300-500rms into it if i get one of the plate amps or the inuke 1000.
I would get the Ultimax 12" since its only $20 more. Then build a box that is 16"w X 20"h X 20"d (using MDF). That gives you 3cf, which is just slightly bigger than the PB-1000. Build it with a slot port that's 2 inches high by 33" long (panels would be 18" for the top of the port, and 12.25" for the back of the port (think miniature version of a marty sub) and power with the $150 Inuke 1000 or $200 DSP version. This will put out about 100-105db at 20hz and over 110 at 30hz. You would be gaining about 5db between 20-35hz compared to the sealed Ultimax 15".

All in you should be spending about $450-500 depending on whether or not you have the tools for cutting your own box.
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post #36 of 42 Old 07-18-2014, 03:36 PM
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Originally Posted by Jay1 View Post
The 12" Infinity actually likes a larger box, around 4 ft3 for HT sub duty. If you want a tiny 12" ported sub the RSS315HO is a good choice. 16" x 20" x 18" with a 4" x 32" port. The same applies as the last sub with using a PVC elbow fitting. This will get you a 2 ft3 22 hz tuned box. This sub would have about 2 db more output then the previous UM10 sub above 20 hz, both with 500 watts. The UM10 sub would have a flatter response down to 16 hz though.
I definitely didn't see this post before writing mine. But as you can see, we're just about on the same page.
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post #37 of 42 Old 07-18-2014, 07:57 PM - Thread Starter
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Ok, so looks like the 12" ported might work. The widest I can go is 18", the tallest is 20, and the deepest is 16. So the dimensions are good. MAYBE I can push it to the 18x20x20 diameter.

So those 2 (HO and Ultimax 12) can fit. Now begs the question. Would the HO with the spec'd box above be better or would the Ultimax with the spec'd box above be better?

Thanks for all your help guys!!

Last edited by 04rex; 07-18-2014 at 08:05 PM.
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post #38 of 42 Old 07-18-2014, 08:38 PM
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Originally Posted by SXRDISBEST View Post
I would get the Ultimax 12" since its only $20 more. Then build a box that is 16"w X 20"h X 20"d (using MDF). That gives you 3cf, which is just slightly bigger than the PB-1000. Build it with a slot port that's 2 inches high by 33" long (panels would be 18" for the top of the port, and 12.25" for the back of the port (think miniature version of a marty sub) and power with the $150 Inuke 1000 or $200 DSP version. This will put out about 100-105db at 20hz and over 110 at 30hz. You would be gaining about 5db between 20-35hz compared to the sealed Ultimax 15".

All in you should be spending about $450-500 depending on whether or not you have the tools for cutting your own box.
I'm a little confused by the specs on that slot port. What is the width 14.5? That would put the tuning point at 26.3 hz in a 3 ft3 box. If the port was 1" high you would get a 19 hz tune. Also that 1" port inside the box dimensions given would leave you with 2.4 ft3, so basically a bit over 2 ft3 after driver/bracing are accounted for. That then leaves a tuning point of 22.6 hz (the 2" high port would have ended up 33 hz tune).

Just trying to clarify for the OP, if I'm missing something here let me know.

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Ok, so looks like the 12" ported might work. The widest I can go is 18", the tallest is 20, and the deepest is 16. So the dimensions are good. MAYBE I can push it to the 18x20x20 diameter.

So those 2 (HO and Ultimax 12) can fit. Now begs the question. Would the HO with the spec'd box above be better or would the Ultimax with the spec'd box above be better?

Thanks for all your help guys!!


HO is green, UM is pink (assuming a 22.6hz tune). Both have 18hz/80hz filters and 500 watts.

The hump shape for the UM response is because it is a high Qts woofer being placed in an undersized ported box. The response would be pretty flat in a 5 ft3 20 hz box.

Slot ports are great but they effectively increase the box size by the port height + wood thickness in as many dimensions as they extend into, which is why the bigger slot ported sub ends up with a similar internal volume to the smaller round ported sub..
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Last edited by Jay1; 07-18-2014 at 08:42 PM.
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post #39 of 42 Old 07-19-2014, 11:12 AM - Thread Starter
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So the regular circular port or piping would be best and allow the box to be smaller?
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post #40 of 42 Old 07-19-2014, 01:04 PM
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So the regular circular port or piping would be best and allow the box to be smaller?
It allows for a smaller box then a slot port, not necessarily better.
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post #41 of 42 Old 07-19-2014, 01:13 PM
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Quote:
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So the regular circular port or piping would be best and allow the box to be smaller?
A circular port will take up less space, correct. Effectively leaving you with a larger box when compared with a slot port. In a 3cf box you can tune to 22hz with a 10" long 3" circular port. In a slot port design with a 2" port it would literally need to be 49" long. My calculations were off above, and you would need a box that is 18" x 21 x 21 to get approx 3 cf. which is the smallest box I would use with these drivers. They don't model particularly well with real small ported boxed.
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post #42 of 42 Old 07-19-2014, 01:21 PM
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Just build a 3cf box and tell your wife it's the same size as the SVS. And if she gets pissed when it's already built, well, she'll just have to deal with it .

Btw, if you want to tune to 20hz, just increase the port length to 13.6"
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