Couch Kicker(Nearfield Setup) - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 80 Old 01-29-2016, 07:32 AM - Thread Starter
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Couch Kicker and Full Marty Build Thread!

So I got a PSA V1500 about a month ago and thoroughly enjoyed it but decided it just wasn’t enough. After researching a bit I have decided to build what I am calling my couch kicker. I have a giant living room area. Something along the lines of 10,000 cubic feet so I am never going to pressurize it. I know the typical answer around here is ‘oh well you only need 8 18’s to pressurize that much area, what’s the big deal?’ I’m trying to make this a stealth build, as in unless you look for the box you won’t see it. The V1500 did a pretty darn good job of pressurizing the area around it, but it was lacking some serious midbass and tuning ability.

So the plan is this. I have a 72” wide couch. I have currently designed on a sheet of paper in front of me a 70” wide box that will contain 3 sealed subs. One DA UM18-22 in the middle, with two Magnum-12’s from DIY Sound flanking it on either side. I will add a little lip to the front bottom of the box so that it will match the pitch of the couch, so it is firing directly into the back of the couch. All this will be powered by one iNuke 6000DSP. The 18 gets one channel, the two 12’s get the other channel.
Major problem I’m running into at this point is box size. The 18 in a 4.22 cube box seems to be pretty lacking on the low end. Peaks at 50hz, 0 at 38.5Hz, F3 at 27hz, and F10 at 17hz. Am I going to be really missing out on those lower frequencies? I was just never blow away by the low stuff like in Interstellar and I am more thrilled with @eng-399 's setup where he has 4 sealed 12’s behind your back and it feels like you are getting kicked in the back everytime a gunshot goes off. Also I was severely disappointed in the V1500’s music ability, my little JBL 10” did a better job at hitting those higher notes around 50hz and up.

So I guess these are my first two questions before I start this build.
-Will the 18 sound super weak on the low end?
-And is it dumb to want to put this all in one box? I could have three separate boxes but hate the idea of wires running everywhere. I just imagine one box would be strong and clean looking.

Also I've attached the WinISD model for my current sealed box.



The Full Marty is COMPLETE!

It took 16 days of multiple hours per day of cutting, gluing, sanding, and painting, but it's done. So you don't have to go through the whole thread, here is the full build!



Beginning construction with port rails.


Port formed


Bracing and padding done


Mashing it all together


Beginning to prime


The giant box done and in place


Finally assembled


And in it's final resting place!
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post #2 of 80 Old 01-29-2016, 07:33 AM - Thread Starter
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The Couch Kicker is COMPLETE! Only took 11 days from first cut to turning it on!





I'll summarize build here, just to have it all in one place!

Speakers arrived in the mail! Where they will be eventually, but behind the couch!


Beginning assembly after cutting wood. Each sub has it's own 1.24 cubic foot container.


Putting the front on the box


Used router to cut holes in box and smooth out edges. And then lots of sanding.


Ready for paint


First a coat of primer


Then Duratex!


Finish looks solid


Feet Installed!


Test Fitting subs and drilling holes for screws


Wiring and stuffing done


Final assembly upstairs, near its permanent home!


After some brief testing, it found it's home!


Couch pulled away a little, this thing rocks!


Video of the subs playing beginning of EoT:

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post #3 of 80 Old 01-29-2016, 08:29 AM
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Me thinks something looks wrong with your model.


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post #4 of 80 Old 01-29-2016, 08:35 AM
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How much space to we have to work with in this box. Height depth width restrictions?


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post #5 of 80 Old 01-29-2016, 08:44 AM
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3 of the VBSS boxes might be worth considering as an alternative - the box size looks about right to go behind a couch and at least it would eliminate some of the guesswork https://www.avsforum.com/forum/155-di...gn-thread.html

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post #6 of 80 Old 01-29-2016, 08:53 AM
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How about 1 big box divided into 3 separate enclosures? You could also run the wires out the front if you did 3 separate or 1 big one and hide them under the couch, or just under the cabinets. I don't think I'd worry about the wires so much. That part seems easy.


You have 70" of length. How much width and height do you have to work with?
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post #7 of 80 Old 01-29-2016, 08:59 AM
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I would go back to Mike's and listen to his stuff with the 18's turned off and ads if that gets you in the ballpark. If you like that, then it's a proven model. Then the flex 12's would just be icing on the cake. One of the great things about the 1260's is they're fast and you'll be able to spread them over the entire couch. I'll bet you could build the two flex-12's under 4 1260's and still be under 3' tall.


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post #8 of 80 Old 01-29-2016, 09:13 AM - Thread Starter
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Quote:
Originally Posted by JohnDean View Post
How about 1 big box divided into 3 separate enclosures? You could also run the wires out the front if you did 3 separate or 1 big one and hide them under the couch, or just under the cabinets. I don't think I'd worry about the wires so much. That part seems easy.


You have 70" of length. How much width and height do you have to work with?
Yea that was the plan, one big box, three separate sealed compartements. Yea wiring could be hidden but the way I'm dreaming it up it would be two Speakon connections on the side of the box, and the rest of the wiring would be internal, just making it really clean.

So dimensions....Here are the maxes for what I can work with....72"W x 24" H x 12" D. There is still space behind the couch with two vents so I don't want to cover those up and I would still like to get behind the couch to access the three windows. So depth is limiting. It could go a little higher but 24" is about where I would like to keep it.
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post #9 of 80 Old 01-29-2016, 09:14 AM - Thread Starter
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Quote:
Originally Posted by Mike Schacht View Post
Me thinks something looks wrong with your model.


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That model is just for the 18 in a 4.22 cube box. Appears to be correct based on Parts Express examples. Also I was at Mike's yesterday and while I didn't hear it with the 18's turned off, I am pretty confident I really liked the 12's better than the 18's. And then throwing at 18 in there for the low stuff I think I will be good to go.

Here is ISD model the the 18 and one Magnum 12 in a 1.4 cube enclosure. Looks like crossover of 100hz seems really good. Also SPL levels are so high probably because I have distance from speaker as 12in, which in reality it will be maybe a little higher than that.
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post #10 of 80 Old 01-29-2016, 09:27 AM
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How about just porting one UM18 in that space? It's roughly 9.5 cuft gross. I'm guessing you could tune to 18-20ish hz. Then down the road if you wanted you could add a Flex-12 or two elsewhere in the room for fun.
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post #11 of 80 Old 01-29-2016, 09:30 AM - Thread Starter
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Originally Posted by JohnDean View Post
How about just porting one UM18 in that space? It's roughly 9.5 cuft gross. I'm guessing you could tune to 18-20ish hz. Then down the road if you wanted you could add a Flex-12 or two elsewhere in the room for fun.
That could work but I don't have anywhere to put Flex12's besides behind the couch. I'm just afraid of the one 18 not hitting the higher notes in the 50-200hz range well enough just like the V1500.
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post #12 of 80 Old 01-29-2016, 10:01 AM
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Are you sure you want the near field drivers playing the 80-200hz range? I think that would drive me crazy.
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post #13 of 80 Old 01-29-2016, 10:13 AM
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Maybe you're aware of this, maybe you're not, but the 12 in a 3+ cubic box can be flat from 17-200, I'm hitting 15hz with room gain. Feel like you're giving up a lot of low end with that enclosure.


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post #14 of 80 Old 01-29-2016, 10:30 AM - Thread Starter
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Quote:
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Maybe you're aware of this, maybe you're not, but the 12 in a 3+ cubic box can be flat from 17-200, I'm hitting 15hz with room gain. Feel like you're giving up a lot of low end with that enclosure.
Hmm is that with the boxes you have right now? In that case would I even need an 18? With my space I'm dealing with I have approximately 7 cubic feet of space to play with.
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post #15 of 80 Old 01-29-2016, 10:32 AM
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Hmm is that with the boxes you have right now? In that case would I even need an 18? With my space I'm dealing with I have approximately 7 cubic feet of space to play with.
That's what I'm trying to say. Yes, that's with the boxes I have now. You could either flank a square shaped box of 4 1260's 2x2 with a flex on each end, or you could build the flex's low and do a row of 4 1260's across the top.
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post #16 of 80 Old 01-29-2016, 10:44 AM
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Couch Kicker(Nearfield Setup)

Something like this could be approx 30" tall x 72" x 15"


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post #17 of 80 Old 01-29-2016, 10:51 AM - Thread Starter
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Something like this could be approx 30" tall x 72" x 15"


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Dang you are quick with that. Would something like this work too? I would really really like to keep it less than 12" deep. Putting all subs facing front and putting ports for the flex on the side? Maybe stacking them instead of side by side like in my terrible picture?
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post #18 of 80 Old 01-29-2016, 10:52 AM
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How tall can you go?


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post #19 of 80 Old 01-29-2016, 11:09 AM - Thread Starter
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How tall can you go?
Ok so height I have a hard limit of 30". But the shorter the better. 12" deep is also definitely a hard limit. Would it hurt me that much to go to the 1060s? They require half the cubic feet and have very similar specs.
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post #20 of 80 Old 01-29-2016, 11:19 AM
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You may run into phase issues with the ported and sealed like that, or maybe not.
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post #21 of 80 Old 01-29-2016, 11:23 AM
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Just do 2 ported um18's. I have mine in a 62w x 32h x 14d box tuned to 24/25hz with 2 6" aeros and they cover everything from 18-150hz .
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post #22 of 80 Old 01-29-2016, 12:36 PM
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Ok so height I have a hard limit of 30". But the shorter the better. 12" deep is also definitely a hard limit. Would it hurt me that much to go to the 1060s? They require half the cubic feet and have very similar specs.


30x12x72 the ends are 20x30x12 and the center is 32x30x12. Not enough cubic feet for 4 of the 12's, but 10's could work.

After looking again, you'd have to do the 10's to hit a 4ohm load.


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post #23 of 80 Old 01-29-2016, 12:42 PM
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This is a hard decision to make on what you need to build. If you want maybe stop back by during the week and we can just run my nearfields and see how you like that. You can do 8-1262 infinitys or the 1260's or go with your original plan. I hope more guys can jump in and give there advice and see what other ideas there is out there on this.

Sounds like you want something that is in the 20-200 HZ range.
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post #24 of 80 Old 01-29-2016, 12:45 PM
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Question, how close can the subs be tot he back of a couch?

Sub build https://www.avsforum.com/forum/155-di...et-r-done.html
Center - JBL LC2
Mains - JBL L820
Surrounds - JBL L820
Sub - Dual UXL'18 enclosures,iNuke6000dsp
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post #25 of 80 Old 01-29-2016, 12:56 PM
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Find a way to fit dual ported 18's behind your couch. You won't regret it. Maybe put feet on the subs so you can put them over your vents without blocking the flow.

>80hz coming from behind you can be distracting.

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post #26 of 80 Old 01-29-2016, 01:06 PM
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Question, how close can the subs be tot he back of a couch?
The closer the better. Just don't let the cones hit.
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post #27 of 80 Old 01-29-2016, 01:23 PM - Thread Starter
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Find a way to fit dual ported 18's behind your couch. You won't regret it. Maybe put feet on the subs so you can put them over your vents without blocking the flow.

>80hz coming from behind you can be distracting.

I wish but too big and not enough space.

Quote:
Originally Posted by eng-399
This is a hard decision to make on what you need to build. If you want maybe stop back by during the week and we can just run my nearfields and see how you like that. You can do 8-1262 infinitys or the 1260's or go with your original plan. I hope more guys can jump in and give there advice and see what other ideas there is out there on this.

Sounds like you want something that is in the 20-200 HZ range.
I might have to do that. What frequency are your Infninty's playing?
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post #28 of 80 Old 01-29-2016, 01:38 PM
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The closer the better. Just don't let the cones hit.
My couch doesnt slant back. I would have to figure out a way to protect the driver.

Sub build https://www.avsforum.com/forum/155-di...et-r-done.html
Center - JBL LC2
Mains - JBL L820
Surrounds - JBL L820
Sub - Dual UXL'18 enclosures,iNuke6000dsp
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post #29 of 80 Old 01-29-2016, 03:35 PM
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I LoOoOoOooOOoOVE nearfield subs.

I have 2 x 5cu vented boxes and 2 x 7.5cu boxes, tuned 20hz and ~18hz with HT18 drivers firing directly behind my seats. The tactile feel and sensation is tremendous. Although my farfield subs have the magnificent HST18's (+6db over the HT18's) in 11cu ported boxes, I can't even tell if they're on or off most of the time since the nearfields are that potent. My only recommendation is to have one driver per seat (unless the person in that seat is my wife; she can't tolerate the nearfield subs and I've kept the speakon unplugged on the very far right). If going ported, you might as well tune the box a little higher >25hz as you most likely won't realize/feel the lower octaves, this affords you a smaller box.
If I were to do it again, I would do 8xflex12's with a static 24hz tune (24" high box).



The key is to keep the woofer as close as possible. Mine are firing 5" from the seats.




In our family room, I've used my old Kicker L5 sub in a small 1cu slanted box with a 100w rms plate amp from my car audio days under our couch and a JL e112 farfield. Same deal, the nearfield sub adds tremendously to the experience. Since adding the little Kicker, we haven't been using our basement/media space much.
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post #30 of 80 Old 01-29-2016, 03:40 PM
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Quote:
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I wish but too big and not enough space.







I might have to do that. What frequency are your Infninty's playing?

20-180hz is what I set the inukes dsp at.
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