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View Full Version : No speaker Specs, how do you determine enclosure requirements?



Joseph7195
07-27-2012, 09:19 AM
I have this small 6 1/2" sub that was used in a home theater, that was given to me, and I have no specs on it whatsoever.

I want to use it in a sub reinforcement in my home theater too, but I have looked everywhere online and cannot find any information on it.

It's a nice sub, built very solid, and has the perfect power rating and impedance for my current home theater receiver. 175 watts and 4 ohm impedance.

Is there a way to determine a good enclosure, or is an enclosure impossible without specs?

disturbed471985
07-27-2012, 09:20 AM
Trial and error on this one...

Joseph7195
07-27-2012, 09:21 AM
That's what I was thinking, but was also dreading, lol

disturbed471985
07-27-2012, 09:26 AM
That's what I was thinking, but was also dreading, lol

Could turn out to be fun... Hell you know you will learn even more then u already know so its time well spent...

Joseph7195
07-27-2012, 09:37 AM
Could turn out to be fun... Hell you know you will learn even more then u already know so its time well spent...


Yep, I guess you're right. Plus I can use all the small scraps of wood I have been collecting over the years of building big enclosures. I will probably start off building a couple small sealed boxes.

Any good starting points on sealed enclosure size? I was thinking of .5 cubes and go up from there.

disturbed471985
07-27-2012, 09:42 AM
.5 sounds about as good as any number at this pt.. Gotta start somewhere then go up and down till u find it.... Might hit it right on the head first shot...

frogcase2002
07-27-2012, 09:57 AM
could build it bigger than you think, then add a little inside the box till you think it sounds the best, like little pieces of wood to make it smaller inside, just a thought

Fiendstolemyamp
07-27-2012, 10:03 AM
Could try posting pics & see if someone knows what it is.

shpatb
07-27-2012, 10:21 AM
make a larger sized box and put pieces of wood inside until it sounds right, a lot easier than building 20 enclosures.

disturbed471985
07-27-2012, 10:23 AM
make a larger sized box and put pieces of wood inside until it sounds right, a lot easier than building 20 enclosures.

Tru but same could be said for adding poly.. Either way would wrk..

Joseph7195
07-27-2012, 11:03 AM
Yep, I am trying to think of a good way to waste the least amount of wood, but still be able to find out the proper box. Here is a couple of pics for anybody that might recognize what this sub needs:

http://i142.photobucket.com/albums/r105/joseph7195/home%20theater%20sub/hometheatersub017.jpg

http://i142.photobucket.com/albums/r105/joseph7195/home%20theater%20sub/hometheatersub016.jpg

http://i142.photobucket.com/albums/r105/joseph7195/home%20theater%20sub/hometheatersub015.jpg

http://i142.photobucket.com/albums/r105/joseph7195/home%20theater%20sub/hometheatersub014.jpg



This is a shirt I won in a contest with DC Creations!! Thanks pro-rabbit ; !!
http://i142.photobucket.com/albums/r105/joseph7195/home%20theater%20sub/hometheatersub013.jpg



If anybody finds any info, please let me know, I will probably try to get an enclosure built tomorrow sometime. I will post up all the info I used (as always,lol) that way I might be able to help somebody with my trial and error too!!

shpatb
07-27-2012, 11:05 AM
Can polyfill be removed by just taking a piece of 2x4 out? lol

disturbed471985
07-27-2012, 11:10 AM
Can polyfill be removed by just taking a piece of 2x4 out? lol

Ur saying go bigger as u can always decrease the volume by adding mass all I am saying is you can also start smaller and add poly to make box seem bigger.

Joseph7195
07-27-2012, 11:25 AM
I have thought about doing it this way:

http://i142.photobucket.com/albums/r105/joseph7195/home%20theater%20sub/boxes.jpg

Just make a rectangular cube (y-axis a lot longer) and just remove the back panel and trim all the sides down an inch or two at a time and just screw the rear panel back on. Only problem i can see with this, is it will waste a lot of wood.

pro-rabbit
07-27-2012, 11:26 AM
Shirt looks good, glad it went to a good home.


As for the enclosure, I would think something around .3-.6 net should be just fine. Just tune real low for hone theater applications.

Joseph7195
07-27-2012, 11:45 AM
Shirt looks good, glad it went to a good home.


As for the enclosure, I would think something around .3-.6 net should be just fine. Just tune real low for hone theater applications.

It went to a very good home, it's the first new shirt I have had in years. I am more thankful than you could imagine!

And a question, does the larger box (in a sealed application) mean the tuning goes lower? Is there a difference in the sound waves having to travel longer distances as opposed to using polyfil where the waves are slowed down?

Fiendstolemyamp
07-27-2012, 12:00 PM
If it came out of a small HT sub it was probably in a ported enclosure, you don't see many of them sealed. Not that you can't run it sealed.

disturbed471985
07-27-2012, 12:01 PM
It went to a very good home, it's the first new shirt I have had in years. I am more thankful than you could imagine!

And a question, does the larger box (in a sealed application) mean the tuning goes lower? Is there a difference in the sound waves having to travel longer distances as opposed to using polyfil where the waves are slowed down?

Thats a keep_hope_alive question... Wish i could help..

Joseph7195
07-27-2012, 12:22 PM
Thats a keep_hope_alive question... Wish i could help..


You've been helping me a ton!!

Joseph7195
07-27-2012, 12:24 PM
If it came out of a small HT sub it was probably in a ported enclosure, you don't see many of them sealed. Not that you can't run it sealed.
When i get a chance I am gonna ask if it was in a ported enclosure and if he remembers the length of the port when he tore the enclosure apart. I am still thinking I will go with a sealed enclosure though. It'd be a lot less guessing

Joseph7195
07-28-2012, 02:44 PM
Just found out the old enclosure was ported, .66 cubic ft with a 2 inch aeroport 3"-4" inches long. This means the tuning was around 50 Hz. The speakers response is between 40-150 HZ. I think I am gonna try a sealed enclosure around .45 cubes.

Any other suggestions would be awesome!!

TaylorFade
07-28-2012, 03:09 PM
6th order that bish.

Joseph7195
07-28-2012, 03:11 PM
The woods cheap, and I have plenty of time, design one out and I will build that *****!!! Just as long as it is actually feasible, and not like 10ftX10ft,lol