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post #1 of 37 Old 08-10-2014, 10:12 AM - Thread Starter
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another Infinity 1262w build

i have had two of these drivers in two 1.5cft. sealed boxes for a while now but i want to try them in ported enclosures.

i know these have been modeled and built to death but im new to using WinISD and all my other builds were copies of others designs so i wanted to model these myself so i can get better at that part of DIY.

my plan is to build two slot ported boxes:

4 cft. NET volume after accounting for the port, driver and bracing.

18Hz tuning

Two ports 4.5" wide 1.5" tall and 25.8" long

box outer dimensions are 18" wide 26" high 21" deep.

port volume at 435 cubic inches

bracing at 200 cubic inches (plywood strips)

driver at .12 cubic feet

i come up with a max rear port velocity of 24.97 m/s at 17.87Hz.

SPL with 300 watts is just over 104 DB at 18Hz. HPF at 17Hz.
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post #2 of 37 Old 08-10-2014, 10:40 AM
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I'm not sure what port airspeed most people are using as a limit nowadays but it looked high based on memory, and still does based on a quick review of Collo's stuff:
http://www.subwoofer-builder.com/port-flares.htm


I'm guessing this is the regular WinISD? Most of the screen dumps I see around are from the pro alpha or whatever.
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post #3 of 37 Old 08-10-2014, 10:45 AM - Thread Starter
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its pro alpha.

the port velocity is one area i need more education on. i was shooting for under 30 m/s which is what seemed to be a good target from my limited reading on the subject.

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post #4 of 37 Old 08-10-2014, 11:17 AM - Thread Starter
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Looks like if I go to two 5" x 2" ports at 38.8" long port velocity maxes at 16.8 m/s
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post #5 of 37 Old 08-10-2014, 07:11 PM
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Add an 18hz hpf to your first model and see what that does for your airspeed.
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post #6 of 37 Old 08-11-2014, 11:20 PM
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that's probably about borderline.


if a larger cab is possible, the port area can be increased without increasing the length.


should be a fun project from a comparative perspective.

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post #7 of 37 Old 08-12-2014, 06:42 AM
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Port at 20hz. Not 18hz.
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post #8 of 37 Old 08-12-2014, 07:02 AM
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Quote:
Originally Posted by brian6751 View Post
i have had two of these drivers in two 1.5cft. sealed boxes for a while now but i want to try them in ported enclosures.

i know these have been modeled and built to death but im new to using WinISD and all my other builds were copies of others designs so i wanted to model these myself so i can get better at that part of DIY.

my plan is to build two slot ported boxes:

4 cft. NET volume after accounting for the port, driver and bracing.

18Hz tuning

Two ports 4.5" wide 1.5" tall and 25.8" long

box outer dimensions are 18" wide 26" high 21" deep.

port volume at 435 cubic inches

bracing at 200 cubic inches (plywood strips)

driver at .12 cubic feet

i come up with a max rear port velocity of 24.97 m/s at 17.87Hz.

SPL with 300 watts is just over 104 DB at 18Hz. HPF at 17Hz.

I have built (2) 3.6cuft net Ported SUBS with the RSS315HO @18Hz tune with one 4" Port and pushed them to the limits of the SA1000 Amp and never heard any Port Chuffing,...if this can help ?
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post #9 of 37 Old 08-12-2014, 07:06 AM
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I built a really nice 24" cube with slot port and 20hz tune on a bash amp plate and it works great. Impressive actually.

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post #10 of 37 Old 08-12-2014, 12:20 PM - Thread Starter
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ok so using the same 2 5" x 2" ports 38.8" long with a tuning of 18Hz and a HPF at 18Hz i get a max port velocity of 15.2 m/s
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post #11 of 37 Old 08-12-2014, 12:21 PM - Thread Starter
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Quote:
Originally Posted by randyc1 View Post
I have built (2) 3.6cuft net Ported SUBS with the RSS315HO @18Hz tune with one 4" Port and pushed them to the limits of the SA1000 Amp and never heard any Port Chuffing,...if this can help ?
i always liked those subs. they look really cool
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post #12 of 37 Old 08-12-2014, 12:31 PM - Thread Starter
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Quote:
Originally Posted by LTD02 View Post
that's probably about borderline.


if a larger cab is possible, the port area can be increased without increasing the length.


should be a fun project from a comparative perspective.
i will try to take comparative readings. ill need to take some more sweeps with the sealed setup and also another close mic with the amp settings

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post #13 of 37 Old 08-12-2014, 01:31 PM - Thread Starter
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hmm

making the box 5cft. with two 5.5"x2"x33.7" ports gets me 105db at 18Hz with 16.3 m/s velocity at 300 watts

going to 500 watts, which would be about the peak of the amp at full throttle, gets up to 107db with air speed at 21.1 m/s.

dang. that seems very impressive from this budget driver. am i missing something?

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post #14 of 37 Old 08-12-2014, 03:17 PM
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Quote:
Originally Posted by brian6751 View Post
hmm

making the box 5cft. with two 5.5"x2"x33.7" ports gets me 105db at 18Hz with 16.3 m/s velocity at 300 watts

going to 500 watts, which would be about the peak of the amp at full throttle, gets up to 107db with air speed at 21.1 m/s.

dang. that seems very impressive from this budget driver. am i missing something?
nope, with my 1260s I have a 22hz tune and get 105db at 20hz with 300w before hiting xmax, airspeed at 12m/s.
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post #15 of 37 Old 08-12-2014, 03:21 PM - Thread Starter
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nope, with my 1260s I have a 22hz tune and get 105db at 20hz with 300w before hiting xmax, airspeed at 12m/s.
i should mention that these are actually the 1262's. allows me to wire them as 2 ohms to a Behringer inuke 1000dsp. i dont think that makes a difference.

what is your box volume?

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post #16 of 37 Old 08-12-2014, 04:05 PM
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Quote:
Originally Posted by brian6751 View Post
i should mention that these are actually the 1262's. allows me to wire them as 2 ohms to a Behringer inuke 1000dsp. i dont think that makes a difference.

what is your box volume?
I saw they were the 1262s, I believe they are the same driver except for the DVC, either way they seem to model pretty close to each other. My boxes are 4.5 cu ft net.

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post #17 of 37 Old 08-12-2014, 04:39 PM - Thread Starter
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im only seeing an increase of 1.5 db from 4 to 5 cft. im kind of leaning towards 4 cft. on these

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post #18 of 37 Old 08-12-2014, 04:52 PM - Thread Starter
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im also looking at two of these in a 8 cft. box......
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post #19 of 37 Old 08-12-2014, 05:26 PM
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Quote:
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im also looking at two of these in a 8 cft. box......
This works rather nice. You get a benefit of dual drivers. You could make it simple 24"x24"x48" for the easiest possible build. Trim one dimension the 1.5" to make it square with the .75+.75 edges, this allows you to use 24" wood + some 23.25" so you waste nothing.
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post #20 of 37 Old 08-12-2014, 05:35 PM - Thread Starter
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This works rather nice. You get a benefit of dual drivers. You could make it simple 24"x24"x48" for the easiest possible build. Trim one dimension the 1.5" to make it square with the .75+.75 edges, this allows you to use 24" wood + some 23.25" so you waste nothing.
yeah... unfortunately that size isnt going to work for this application. there just isnt enough room. thats also a lot more firepower than my little AJ Pioneer mains can keep up with

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post #21 of 37 Old 08-12-2014, 06:02 PM - Thread Starter
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i think im going to take your advice. 4 cft. tuned to 20 Hz with a 20 hpf looks to be the sweet spot. im want to use 3 ports. each 1.5" x 5" x 35.5"

port velocity stays under 15 m/s with 300 watts and just breaks 19 m/s with 500 watts.

how does that sound?
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post #22 of 37 Old 08-12-2014, 06:14 PM
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i think im going to take your advice. 4 cft. tuned to 20 Hz with a 20 hpf looks to be the sweet spot. im want to use 3 ports. each 1.5" x 5" x 35.5"

port velocity stays under 15 m/s with 300 watts and just breaks 19 m/s with 500 watts.

how does that sound?
Sounds good, If your WAF is as bad as mine, you'll never hit 100db anyways. Around here 75 is making her go deaf and going to ruining our kids hearing for life!
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post #23 of 37 Old 08-12-2014, 06:53 PM - Thread Starter
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Sounds good, If your WAF is as bad as mine, you'll never hit 100db anyways. Around here 75 is making her go deaf and going to ruining our kids hearing for life!

that depends. if its me watching my stuff, its 75. If its her watching the Kardashians(sp?) its 130!!!

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post #24 of 37 Old 08-13-2014, 02:10 PM - Thread Starter
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18 Hz in Blue
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post #25 of 37 Old 08-17-2014, 08:48 AM - Thread Starter
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problem with 18Hz is that it seems to go past xmax. 20Hz in 4 cubes keeps it just under xmax at all levels. but its really close. 12.7mm out of 13mm max. is that too close?

thats with 300 watts. boost that to 500 and im over 16mm at around 30 Hz

300 watts




500 watts

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post #26 of 37 Old 08-17-2014, 10:22 AM
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20-22hz is perfect. Error on the side of higher if you need to.

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post #27 of 37 Old 08-17-2014, 10:29 AM - Thread Starter
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i also have a question regarding the slot port. if one wide slot port is separated by two braces, should it be calculated as three separate ports? i noticed it calculates differently counted as three separate as opposed to just adjusting the width of one port to account for the braces.

Example.

this sub is 16.5" wide total. If i want a slot across the entire bottom, i subtract 1.5" to account for the side panels, then another 1.5" to account for the vent braces which gives me 13.5"


1 slot port 1.5 x 13.5 calculates to 30.25" for a 20Hz tune.


Now lets treat it as 3 separate ports. 13.5 divided by 3 = 4.5

3 ports 1.5 x 4.5 calculates to 31.82" for the same tune.

if its 3 ports then i think ill go with 1.75 x 4 x 33

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post #28 of 37 Old 08-17-2014, 10:32 AM - Thread Starter
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Quote:
Originally Posted by Mfusick View Post
20-22hz is perfect. Error on the side of higher if you need to.

ill just have to limit the amp to 300 watts. this driver cannot handle 500 watts with this box design. thats fine. its still hitting 105DB at 20Hz with 300 watts

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post #29 of 37 Old 08-17-2014, 12:04 PM
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i also have a question regarding the slot port. If one wide slot port is separated by two braces, should it be calculated as three separate ports?
yes!
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post #30 of 37 Old 08-17-2014, 01:20 PM
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I just calculate the slot port as a single port. And I subtract out the braces from the length total. Simple that way.

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