AVS Forum | Home Theater Discussions And Reviews (https://www.avsforum.com/forum/)
-   DIY Speakers and Subs (https://www.avsforum.com/forum/155-diy-speakers-subs/)
-   -   Dual Sealed SI HS24 Build (https://www.avsforum.com/forum/155-diy-speakers-subs/1511560-dual-sealed-si-hs24-build.html)

WereWolf84 01-13-2014 05:12 AM

Dual Sealed SI HS24 Build
 
So here will be the first ever sub I have ever build, I just received the dual HS 24" drivers from Nick last weekend, Nick did a great job in solid packaging to ensure its perfect condition throughout the long journey delivery, special thanks to Nick http://files.avsforum.com/images/smilies/wink.gif planning to start the build in coming weeks

Previously, I have owned many ported subs like Klipsch Sub 10 (my first ever sub http://files.avsforum.com/images/smilies/tongue.gif), HSU MBM-12, Rythmik FV15HP, Rythmik F12 (sealed), SVS PC12-Plus and JTR Captivator (4K Watts Passive) & dual buttkicker LFE tactile transducers, I really want to try sealed subs this time for the extreme low frequencies http://files.avsforum.com/images/smilies/biggrin.gif I have a question here, will these dual sealed subs achieve my goal in a non-sealed room? as my setup is in my living room with open areas to kitchen

As for the sealed box dimension, I would like to go for a 10 cubic feet or 28" x 28" x 28", any recommendations & suggestions are most welcome http://files.avsforum.com/images/smilies/smile.gif especially on areas such as internal bracing, polyfill......etc

Dual HS24
https://www.avsforum.com/content/type...t/700/flags/LL

https://www.avsforum.com/content/type...t/700/flags/LL

gpmbc 01-13-2014 05:14 AM

You're off to a good start smile.gif

WereWolf84 01-13-2014 05:29 AM

build process


tongue.gif

WereWolf84 01-13-2014 05:30 AM

Quote:
Originally Posted by gpmbc View Post

You're off to a good start smile.gif
Wow, you are quick to response biggrin.gif thanks anyway wink.gif

jpmst3 01-13-2014 05:33 AM

Cool!

You should have no problem in achieving your goals with two of those bad boys!

I am guessing you are talking 10 cubes for each driver? If so, that should be about perfect.
Just brace them well, don't over complicate it. I would use fill, but it is not required.

You are definitely taking it up a few notches moving from the subs you mentioned to dual 24s! Awesome!

WereWolf84 01-13-2014 05:37 AM

Quote:
Originally Posted by jpmst3 View Post

Cool!

You should have no problem in achieving your goals with two of those bad boys!

I am guessing you are talking 10 cubes for each driver? If so, that should be about perfect.
Just brace them well, don't over complicate it. I would use fill, but it is not required.

You are definitely taking it up a few notches moving from the subs you mentioned to dual 24s! Awesome!
you are right, I'm going for 10 cubic feet sealed box for each driver

jpmst3 01-13-2014 05:39 AM

Quote:
Originally Posted by WereWolf84 View Post

you are right, I'm going for 10 cubic feet sealed box for each driver

Awesome, bass bliss here we come!cool.gif

WereWolf84 01-13-2014 05:45 AM

you mean polyfill is not required? I know Swolephile built his sealed box without stuffed it and it sounds great to him

gpmbc 01-13-2014 05:50 AM

If you build the box to the exact volume intended then polyfil is not required.

WereWolf84 01-13-2014 05:55 AM

Here is what I got using this calculator



so, polyfill/ pillows are not needed?

ChopShop1 01-13-2014 05:55 AM

12 Attachment(s)
I'll tell you my feeling on bracing, but some would call it overkill......but I'm saying this to a guy with 24" subs soooo biggrin.gif

I like to place bracing so there is no more than a six inch space unbraced in any given direction where possible. I also like to make panels instead of just using stick bracing. To me, it's more time consuming, but a bit easier to get amble bracing in and be sure to clear all the internals by designing the brace as a whole piece around everthing.

jpmst3 01-13-2014 05:58 AM

Quote:
Originally Posted by WereWolf84 View Post

you mean polyfill is not required? I know Swolephile built his sealed box without stuffed it and it sounds great to him

No, not required. You might want to do some reading: http://www.data-bass.com/data?page=content&id=79

WereWolf84 01-13-2014 06:00 AM

Quote:
Originally Posted by jpmst3 View Post

No, not required. You might want to do some reading: http://www.data-bass.com/data?page=content&id=79
Thanks for the link wink.gif

WereWolf84 01-13-2014 06:02 AM

Quote:
Originally Posted by ChopShop1 View Post

I'll tell you my feeling on bracing, but some would call it overkill......but I'm saying this to a guy with 24" subs soooo biggrin.gif

I like to place bracing so there is no more than a six inch space unbraced in any given direction where possible. I also like to make panels instead of just using stick bracing. To me, it's more time consuming, but a bit easier to get amble bracing in and be sure to clear all the internals by designing the brace as a whole piece around everthing.
I'm thinking to use windows bracing, is that good enough?

jpmst3 01-13-2014 06:07 AM

Quote:
Originally Posted by WereWolf84 View Post

Thanks for the link wink.gif

Sure thing. I would stuff them, even if you use cheap pillows.

Also, yes, window bracing is very effective.

ChopShop1 01-13-2014 06:15 AM

12 Attachment(s)
Quote:
Originally Posted by WereWolf84 View Post

I'm thinking to use windows bracing, is that good enough?

IMO yes. Just remember you don't need it at each end panel because the panel itself acts there. I would make the window that spans top to bottom and side to side first (a number of them based on the box size) just because you can make the cutout for the driver basket and motor.....then just put front to back bracing in between each window panel. Use angles coming off the front baffle to "ride" the basket toward the center of the first brace and attach as close to center as possible while clearing the driver. Sorry if that's elementary, I know you said its your first one and these are the things that have made it easier for me since my first projects. Now I make other stupid mistakes....like putting so much bracing that I can't get my hand to the inside back to install binding posts biggrin.gif

WereWolf84 01-13-2014 06:16 AM

Quote:
Originally Posted by jpmst3 View Post

Sure thing. I would stuff them, even if you use cheap pillows.

Also, yes, window bracing is very effective.
if you were me, how much would you stuffing in the 10 cubic feet box?

ChopShop1 01-13-2014 06:17 AM

12 Attachment(s)
Quote:
Originally Posted by jpmst3 View Post

Sure thing. I would stuff them, even if you use cheap pillows.

Also, yes, window bracing is very effective.

Agreed there too...I always put something in there

jpmst3 01-13-2014 06:19 AM

Quote:
Originally Posted by WereWolf84 View Post

if you were me, how much would you stuffing in the 10 cubic feet box?

Stuffing makes subtle differences. So, an extra pound or two is negligible. I am sure you can get quite a few pounds of polyfill in there.
If you go the cheap Wal-Mart pillow route, I would see how many you can get in there without having to severely jam them in. It is also easy having the fill in neat and easy to handle packages, ala pillows.
You obviously don't want the driver's pole vent blocked or anything touching the cone.

WereWolf84 01-13-2014 06:23 AM

I'm definitely prefer the pillow route, much easier & trouble free, should I line the internal walls with something like Dacron before stuffing pillows in?

jpmst3 01-13-2014 06:24 AM

Quote:
Originally Posted by WereWolf84 View Post

I'm definitely prefer the pillow route, much easier & trouble free, should I line the internal walls with something like Dacron before stuffing pillows in?

Nah, I wouldn't bother lining the walls. The fill will do nicely.

Bill Fitzmaurice 01-13-2014 06:25 AM

Quote:
Originally Posted by WereWolf84 View Post

I'm thinking to use windows bracing, is that good enough?
Window bracing is fine, but do it the right way, shown below on the right. Most do it as pictured on the left, which uses more material, but is less effective.


Don't forget that bracing from the baffle to the back is just as important as the other panels.
Quote:
if you were me, how much would you stuffing in the 10 cubic feet box?
Enough to arrive at the desired Q/response.
Quote:
If you build the box to the exact volume intended then polyfil is not required.
Damping is always required, otherwise you'll have internal reflections of above bandwidth harmonics back to the cone, resulting in higher THD. That's totally different from stuffing the cab to lower Q.

WereWolf84 01-13-2014 06:30 AM

Is this type of window bracing also good?



How much space should I leave between the windows bracing and the motor of the driver? 2 inches ?

WereWolf84 01-13-2014 06:32 AM

Quote:
Originally Posted by Bill Fitzmaurice View Post

Window bracing is fine, but do it the right way, shown below on the right. Most do it as pictured on the left, which uses more material, but is less effective.


Don't forget that bracing from the baffle to the back is just as important as the other panels.
Enough to arrive at the desired Q/response.
Damping is always required, otherwise you'll have internal reflections of above bandwidth harmonics back to the cone, resulting in higher THD. That's totally different from stuffing the cab to lower Q.
I read somewhere there is a general rule of thumb, one pound polyfill per one cubic feet especially for large box that over 3 cubic feet

jpmst3 01-13-2014 06:38 AM

Quote:
Originally Posted by WereWolf84 View Post

I read somewhere there is a general rule of thumb, one pound polyfill per one cubic feet especially for large box that over 3 cubic feet

That's probably a good rule. Again, you are talking subtle differences. See what fits after you have the bracing in place.

ChopShop1 01-13-2014 08:36 AM

12 Attachment(s)
Quote:
Originally Posted by Bill Fitzmaurice View Post

Window bracing is fine, but do it the right way, shown below on the right. Most do it as pictured on the left, which uses more material, but is less effective.


Don't forget that bracing from the baffle to the back is just as important as the other panels.
Enough to arrive at the desired Q/response.
Damping is always required, otherwise you'll have internal reflections of above bandwidth harmonics back to the cone, resulting in higher THD. That's totally different from stuffing the cab to lower Q.

+1 This is exactly what I was saying above...albeit tougher to see without pics tongue.gif

Trepidati0n 01-13-2014 08:47 AM

Quote:
Originally Posted by Bill Fitzmaurice View Post

Window bracing is fine, but do it the right way, shown below on the right. Most do it as pictured on the left, which uses more material, but is less effective.


Don't forget that bracing from the baffle to the back is just as important as the other panels.
Enough to arrive at the desired Q/response.
Damping is always required, otherwise you'll have internal reflections of above bandwidth harmonics back to the cone, resulting in higher THD. That's totally different from stuffing the cab to lower Q.

Friends used to do the one on the left. Then they switch to the one on the right but they don't cut it out from a solid piece. They just us 0.5x2" or 1x1" strips of pine based upon what they find cheapest. Makes it stupidly easy to make (chop saw) and install

Scott Simonian 01-13-2014 03:15 PM

135 Attachment(s)
Let's get these babies powered up! biggrin.gif

Swolephile 01-13-2014 03:42 PM

Good luck with your build. You should be very pleased with the performance of these drivers.

WereWolf84 01-13-2014 04:57 PM

Quote:
Originally Posted by Scott Simonian View Post

Let's get these babies powered up! biggrin.gif
I'm excited & can't wait to do so biggrin.gif


All times are GMT -7. The time now is 07:38 AM.

Powered by vBulletin® Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
vBulletin Security provided by vBSecurity (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.