8" subs and 12" sub together in one room - Realm of Excursion



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Old 06-26-2006   #1 (permalink)
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Default 8" subs and 12" sub together in one room

posting this for my dad, he wants to put 4 8's and a single 12 for his home audio/theater setup...and wants me to Build the boxes for them...he's not sure on what kind of 12, but he wants to run those tang band 8's...

i'm going to port the box for the 12 for sure, should I port the box for the 8's as well? also do I have to worry about cancellation at all? what should I tune each box too? i'm thinking like 25 htz for the 12, then higher for the 8's, but I'm not sure how high...what do you guys think? this is for a HT setup, he listens through alot of music through it too...good idea/bad idea?
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Old 06-26-2006   #2 (permalink)
 
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20 for the 12 and 38 for the 8's.. just a guess.. OR, you could seal the 8's in a big box....
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Old 06-26-2006   #3 (permalink)
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I would port them all.As for cancellation im not sure,it depends on the subs.I havent had a problem with mixing before.
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Old 06-26-2006   #4 (permalink)
 
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oh.. and one more thing.. put the 12 out of sight and put the 8's under a couch or something in a long skinny box.. that'd kick ass 8)
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Old 06-26-2006   #5 (permalink)
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lol nice idea but if you want them for music i would keep them infront of you,but thats just me.
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Old 06-26-2006   #6 (permalink)
 
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yeah.. what he said.. because the way I was saying is so you can feel explosions.. but then the music would be felt instead of heard and it would suck lol.. SO.. put the 12 INFRONT of you.. and.. the 8's under a couch.. that way it's a win/win situation lol
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Old 06-26-2006   #7 (permalink)
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i would leave out the 12" woofer entirely. cancellation will occur due to variations in the speakers and boxes.

if he listenins to a lot of music 25 hz is probably a good mix.

center the subs as close as possible in between the two front speakers close to the wall.
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Old 06-26-2006   #8 (permalink)
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the tb8's are a small but powerful sub. i'd definitely port them. i currently have mine a 1 cube ported at 32Hz with a 150W plate amp. the output is decent, definitely comparable to a 10", and it will play notes down to low 20's. i'm sure four them will produce much better results. as for cancellation, it won't be too much of a proble. try to keep all of them in a line so you can couple the output of all four. this is also known as a line array.
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Old 06-26-2006   #9 (permalink)
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alright cool...sounds like thats what we're going to do..4 TB 8's, a he's talking about buying my JL 12w6v2....how would that perform in a house? no problem with me, I want something bigger, like a type r 15 and a bigger amp...would that JL sound good? it is a SQ driver...

so like 24 htz for the 12, then 37 or so for the 8's? shon, is 1 cube optimum for those TB 8's? or should I go smaller/bigger?
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-Audio Mods-
Alpine 9835 CD/MP3 player - very sweet!
MTX Audio 6x9's & 4x6's
Alpine M500 Mono V12 amp - sub amp
Rockford Fosgate 450S 2 channel - component amp
JL Audio 12W6v2
2 cu. ft - 35 htz
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Old 06-26-2006   #10 (permalink)
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bigger gives a flatter response... but i dont know ****e about home audio or acoustics in a room so dont listen to me 8)



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Old 06-26-2006   #11 (permalink)
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Quote:
Originally Posted by klumb15
shon, is 1 cube optimum for those TB 8's? or should I go smaller/bigger?
it all depends on what alignment you want. usually an optimum enclosure will provide a flat ressponse. for example, this design would be pretty optimun. the only drawback is that is has a roll-off around 42Hz.



i personally like to have a boost around mid 20's to 30hz for ht so i tune lower and go larger. however, this will sometimes lower your overall ouptut.
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Old 06-26-2006   #12 (permalink)
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You'd be better off building 2 identicle subs and placing them in opposing corners.

That, or build 4 identicle subwoofers and put one in each corner.

There will definitely be cancellation issues unless you place them as I have stated.

Heres some reading.

http://www.audioholics.com/techtips/...lacementP1.php

At the end of the article, there is room response graphs for subwoofer placement (for 2 identicle subwoofers).

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Old 06-26-2006   #13 (permalink)
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Quote:
Originally Posted by roe
it all depends on what alignment you want. usually an optimum enclosure will provide a flat ressponse. for example, this design would be pretty optimun. the only drawback is that is has a roll-off around 42Hz.



i personally like to have a boost around mid 20's to 30hz for ht so i tune lower and go larger. however, this will sometimes lower your overall ouptut.
I wouldn't get to big on flat anechoic responses. Once you place that sucker in a room without a second sub (or any number of identicle subs in even numbers[2, 4, 28]) its going to turn into a roller coaster.

That is, ofcourse, if you don't have an EQ system (BFD, Velodyne SMS-1) or room treatements.

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Old 06-26-2006   #14 (permalink)
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Quote:
Originally Posted by roe
the tb8's are a small but powerful sub. i'd definitely port them. i currently have mine a 1 cube ported at 32Hz with a 150W plate amp. the output is decent, definitely comparable to a 10", and it will play notes down to low 20's. i'm sure four them will produce much better results. as for cancellation, it won't be too much of a proble. try to keep all of them in a line so you can couple the output of all four. this is also known as a line array.
Line arrays only benifit speakers (mid, treble) not subwoofers. He'd be better off building 1 box for 2 woofers (max), and having 2 subs(or 4).

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Old 06-26-2006   #15 (permalink)
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Quote:
Originally Posted by Sheep
I wouldn't get to big on flat anechoic responses. Once you place that sucker in a room without a second sub (or any number of identicle subs in even numbers[2, 4, 28]) its going to turn into a roller coaster.

That is, ofcourse, if you don't have an EQ system (BFD, Velodyne SMS-1) or room treatements.

SheepStar
i definitely know what you mean, however what you mentioned is far advance from what the perosn will be getting into. you have to consider that as well. in general, a good point to start when trying to achieve a flat response is to start with a design with a flat response. that way, you can easily eq the peaks and valleys in the actual response curve.
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Old 06-27-2006   #16 (permalink)
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Quote:
Originally Posted by Sheep
Line arrays only benifit speakers (mid, treble) not subwoofers. He'd be better off building 1 box for 2 woofers (max), and having 2 subs(or 4).

SheepStar
you do have to note that subs do benefit from the coupling effect. this is done by placing subs in a row, similar to line array. i may have made a mistake by including a line array as it's true it's referred to mainly highs and mids in home audio. however, i get these terms crossed when dealing with pro audio and home audio. in pro audio, a line array can consist of your highs, mids, and subs.
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Old 06-27-2006   #17 (permalink)
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whoa, getting pretty technical here...so there are a few ways to recieve a flatter response, but if you had to build another box for your TB 8" shon, what would you go with? becuase thats what specs i'll use ...i plan on making it long and skinny, so it can be placed on the top of a big screen TV...then the 12 i'll put on the floor...any advantages over going downfiring opposed to front firing for the 12? I would like to frontfire it, so then he could show of the sub a little bit, i love the way the JL's look..
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-Audio Mods-
Alpine 9835 CD/MP3 player - very sweet!
MTX Audio 6x9's & 4x6's
Alpine M500 Mono V12 amp - sub amp
Rockford Fosgate 450S 2 channel - component amp
JL Audio 12W6v2
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Old 06-27-2006   #18 (permalink)
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as for having a flat response, that's really up to you. most people in ht usually want the optimun response from their system so they do what they can to obtain the flat resposne. however, if you prefer a slight boost on the low-end, that's fine as well. it really comes down to want you would like.

as for placing the tb near your tv, i won't suggest as these subs are not shielded.

in general, downfiring can help with your response. however, you first have to find out if the tb is capable of being downfired. theres's a formula for this. i'll try to dig it up.
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Old 06-28-2006   #19 (permalink)
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Downfiring vs front firing. Not again! (I deal with this question ALOT on another forum).

There are theories that front firing woofers have a better "voice" (upper range) while down firing woofers have a better tactile response and low end extension (no more then a couple Hz) due to a loading surface.

Personally, I have had my ass shaken by a front firing, front ported subwoofer (using no loading surfaces around the driver and port). But I've heard great things about down firing too.

I havent had a chance to audition a down firing sub in my theater, but if done properly, either design with yield excellent results.

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