SI DS4's - 12 cft. ported - AVS Forum | Home Theater Discussions And Reviews

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post #1 of 15 Old 04-06-2016, 01:17 PM - Thread Starter
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SI DS4's - 12 cft. ported 17Hz

Going to be starting this build soon and wanted to get the thread going. So far I have these measurements

tune is 17Hz

22" wide x 23.25" deep x 58" tall . Double front baffle

Port is 3.5 x 19 x 44.75

I get 2975.875 cubic inches for the port volume

Looks like about 12.8 cft before the driver and bracing.

Port velocity and excursion seem good to me.

Man, these things are going to be YUUUGE!

HP at 17Hz. 2db PEQ at 18Hz.




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Last edited by brian6751; 04-07-2016 at 08:53 AM.
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post #2 of 15 Old 04-06-2016, 01:20 PM - Thread Starter
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reserved

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post #3 of 15 Old 04-06-2016, 01:21 PM
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Looking forward to seeing how your Tall Marty turns out.
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post #4 of 15 Old 04-06-2016, 02:02 PM - Thread Starter
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Thats ridiculous. This is a modified Cyclops

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post #5 of 15 Old 04-06-2016, 04:01 PM
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A Martyclops build.......


Whatever it is it will be nice.
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post #6 of 15 Old 04-06-2016, 04:40 PM - Thread Starter
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Mega Tall Marty Clops or Mt. MC for short.
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post #7 of 15 Old 04-06-2016, 07:29 PM
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If you are aiming for 17 hz, you should design for a lower tune since you are going to end up with a smaller net volume. I ended up with a slightly higher tuning than I wanted on my subs because of that. Also, are you not going to brace the port?
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post #8 of 15 Old 04-06-2016, 07:36 PM
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Not sure what the above comment means. Just make sure you have a net volume of what you simmed. Then add on your ports volume and then see what you will need for an external size. Simple enough.
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post #9 of 15 Old 04-06-2016, 07:59 PM - Thread Starter
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Trying to understand what you mean here.

I used the volume calculator on hometheatershack for the size which takes into consideration the port volume. Then I added about .8cft. To account for the driver and bracing.

Also, yes the ports are braced. 22" width minus 1.5" for the side walls and another 1.5" for the two braces is 19" width

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post #10 of 15 Old 04-06-2016, 08:53 PM
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I didn't realize that you had already factored all of that in. Good luck with the build!
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post #11 of 15 Old 04-06-2016, 09:04 PM
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only problem I see is that the first port resonance is a little too low (151Hz)with those dimension.

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post #12 of 15 Old 04-06-2016, 09:14 PM - Thread Starter
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from what I have read, that should be fine crossing at 80Hz, no?

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post #13 of 15 Old 04-07-2016, 09:10 AM - Thread Starter
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anyone know if it is ok to have the driver further away from the ground than normal, as in mounting it in the cab so that its closer to center height of the room? Would this excite some bad room modes or something? Im thinking that I want to mount the driver in the middle of the enclosure. Its 58" tall so right at 29". I know thats not the center os the room but it is higher than "normal".

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post #14 of 15 Old 04-07-2016, 09:44 AM
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Quote:
Originally Posted by Red Devil 24 View Post
only problem I see is that the first port resonance is a little too low (151Hz)with those dimension.


countless builds with first port resonance at 140hz or so. no problems with 80hz crossover.
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post #15 of 15 Old 04-07-2016, 09:47 AM
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Quote:
Originally Posted by brian6751 View Post
anyone know if it is ok to have the driver further away from the ground than normal, as in mounting it in the cab so that its closer to center height of the room? Would this excite some bad room modes or something? Im thinking that I want to mount the driver in the middle of the enclosure. Its 58" tall so right at 29". I know thats not the center os the room but it is higher than "normal".

keep an eye on 1/4 distance cancellations from the boundaries and floor bounce cancellation. other than that, if your cab is heavy enough not to vibrate, mounting the driver like that is ok.
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