DIY sub versus JTR Captivator - AVS Forum
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post #1 of 270 Old 06-04-2014, 08:22 PM - Thread Starter
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How much would it cost or can i get close to build a sub  as good as the JTR Captivator?

I ask this becasue I have returned the speakers i got becasue the sub I have will not do them justice.

 

Buying a Router and Router table and a Table saw with the other tools i have I could start  buildng some speaker and subs and have some fun.

 

But if it will be very expensive to get somthing as good or close to the captvator I may be better off buying one out rite.

Even though i think I would enjoy woking at making some nice subs and maybe speakers.

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post #2 of 270 Old 06-04-2014, 09:20 PM
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It's an 18 in a ported box, it isn't magic. Yes you can build something like it, yes you can do it cheaper.

lms 5400, uxl18, etc. lots of options.
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post #3 of 270 Old 06-04-2014, 10:14 PM
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+1. Either of those drivers would be pretty similar to a Cap 2400 (probably better). To match a Cap 1000 all you would probably need would be a Dayton RSS460HO-4 or a Stereo Integrity HT18 D2. These are way cheaper.
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post #4 of 270 Old 06-04-2014, 11:51 PM
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Ported 18" sub box from Erich & DIYsoundgroup for around $200 shipped.



$500 for a UXL-18 and a inuke with build in DSP, I would recommend the inuke 6000DSP for $399 because it leaves the option open to build a second sub and power both off of a single amp.

All of that for close to the price of a single passive Cap 2400. smile.gif

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post #5 of 270 Old 06-05-2014, 01:46 AM
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Its hard to know if a DIY effort is better or worse performing, because there have never been published any real testing of the captivators. They are awfully small for ported 18" and the ports look kind off small too. Does anybody know the dimensions of the ports. Id like to try and sim it.
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post #6 of 270 Old 06-05-2014, 03:38 AM - Thread Starter
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I think I need to tun down what I want to build I be leave that a cap 2400 may be to much for me. even with 4000 cubic feet and then a large opening in the rear it may rattle / knock off the frames my wife has on the wall. Also may make the grandfather clock chime when it isn't suppose too lol.

 

I just am looking to make  sub that wont be working to hard for that size of a room yet i also don't want a cheap sounding rumble if any.

So i may just build me a single 15 " one

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post #7 of 270 Old 06-05-2014, 04:54 AM
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Too much? What does that mean? You can always (and by always, I mean when your wife's not around) turn it down.....
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post #8 of 270 Old 06-05-2014, 05:08 AM
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Quote:
Originally Posted by grimed View Post

How much would it cost or can i get close to build a sub  as good as the JTR Captivator?
Build a folded horn and you can seriously outclass a Cap for less than $500, including an amp.

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post #9 of 270 Old 06-05-2014, 08:10 AM
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Bill,
Not really questioning you as I'm well aware that your knowledge is far superior to mine but could you elaborate? How would you best the cap in the 20 to 80hz range for under 500 bucks and could you do it without some massive box, like 10 to 12 cubic feet or less?

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post #10 of 270 Old 06-05-2014, 08:33 AM
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Grimed,
If you don't want a sub that can rattle pictures then you don't want anywhere near the output of a captivator.

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post #11 of 270 Old 06-05-2014, 08:34 AM
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For the price of a Cap2400, you can build 4 Dayton RSS460's or SI18 and grab a CV5000 for power. That should best the Captivator in more ways than 1 and still end up a bit cheaper.
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post #12 of 270 Old 06-05-2014, 08:41 AM
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I mean you could easily spend a couple hundred dollars on the tools needed to build a large horn not to mention the hours and hours of time it would take. And then of course since the op mentioned waf it may be hard to put a box two or three times the size of a cap in room.

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post #13 of 270 Old 06-05-2014, 08:46 AM
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John since you are using a separate amp in your suggestion do you really think you could build 4 si18 subs and a cv5000 amp and all the wood, glue, clamps, paint, wire, sandpaper, terminals etc for much less than a passive cap + ep4000?

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post #14 of 270 Old 06-05-2014, 08:58 AM
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Also how much more output would you really get especially around port tune for all the work it would take to build and finish 4 subs plus the huge amount of room four big boxes would take up?

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post #15 of 270 Old 06-05-2014, 09:26 AM
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The cost for just the si18's and the cv5000 is like $1600.

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post #16 of 270 Old 06-05-2014, 09:33 AM
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Never mind the amps, unless you get the powered Cap. You could use the same amp for each so they cancel each other out as money goes. The SI is $200 shipped so 4 of them would be $800. You could build 4 marty cubes for $1200 total and that would outperform the Cap(easily) and have a smother response with multiple subs. DIY is always cheaper than commercial unless one wants to get fancy or use nothing but the most expensive parts(drivers and amps, dsp, etc...)
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post #17 of 270 Old 06-05-2014, 09:36 AM
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Heck, build a single box like Notnyt with two SI's and for $500-$600 you would outperform the cap.
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post #18 of 270 Old 06-05-2014, 09:39 AM
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I think some people underestimate the value of some of the id subs that are available today. It is a great time to be in the market for reference output down to 20hz if you have some knowledge.

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post #19 of 270 Old 06-05-2014, 09:40 AM
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Others over estimate, the Cap driver is a 30mm 18 inch driver. The SI's are 22mm so two of them would outperform the one, simple.
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post #20 of 270 Old 06-05-2014, 09:42 AM
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Mk,
How do you out perform it in the same footprint. Most are aware you can get more output with twice or more footprint.

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post #21 of 270 Old 06-05-2014, 09:43 AM
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Quote:
Originally Posted by audio0947 View Post

Also how much more output would you really get especially around port tune for all the work it would take to build and finish 4 subs plus the huge amount of room four big boxes would take up?

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Originally Posted by audio0947 View Post

I mean you could easily spend a couple hundred dollars on the tools needed to build a large horn not to mention the hours and hours of time it would take. And then of course since the op mentioned waf it may be hard to put a box two or three times the size of a cap in room.

The whole point of the DIY Speakers and Subs section is to talk about building our gear by ourselves. You're making it sound like ALL THIS WORK has to go in to building a sub and forgetting that building it ourselves is the biggest part of it. Taking pride in building something that amazes you and your friends/family is very rewarding and should be encouraged. It also saves money and usually gives us better performance.
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post #22 of 270 Old 06-05-2014, 09:45 AM
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Assuming you have no real woodworking tools just like the average homeowner.

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post #23 of 270 Old 06-05-2014, 09:47 AM
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Dan,
I think the op is new to diy and doesn't have a router etc sitting around.

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post #24 of 270 Old 06-05-2014, 09:49 AM
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If one has no tools and no woodworking skills I would assume thy would not be in the DIY section to begin with. Heck, even if that is the case one can order kits and just use a screw driver. Still to hard? Then have a friend do it for some food and beer!

The SI is only going to be down 3 dBs or so above 30hz from the Cap so even if you used one it would be very close in performance for $300!
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post #25 of 270 Old 06-05-2014, 09:53 AM
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Dan,
I think the op is new to diy and doesn't have a router etc sitting around.

I built a folded horn by going to Home Depot and buying 2 sheets of plywood. The guy at the store cut it for me in 10 minutes and I took the pieces home and put them together the same day. The only thing I actually cut was the plate amp cutout and I used a drill and a jigsaw. I spent about $400 I guess for materials, not including the drill and jigsaw of course but you can get those second hand for peanuts. Anyway, no need for a router unless you're doing something fancy and there is nothing fancy about a folded horn!
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post #26 of 270 Old 06-05-2014, 09:53 AM
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You do realize the Cap is $1700 plus shipping, right? So close to $2000 shipped. The SI driver is $200 shipped. Kits from Erich are $200 shipped, do the math. The SI driver is going to be down 3 dBs to the Cap driver so unless you push it to the max you won't notice the difference. If he needs more output he can build a dual woofer box for the same space except height and outperform the Cap by 3 dBs assuming doubling power.
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post #27 of 270 Old 06-05-2014, 09:57 AM
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I was under the impression that he was asking if you could better the cap if starting totaly from scratch. Which would be hard if using the same footprint.

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post #28 of 270 Old 06-05-2014, 10:00 AM
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MK,
Trust me not really arguing and have built many projects but have you taken into account the need for tools and paint ect?

Close your eyes and hear the truth!
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post #29 of 270 Old 06-05-2014, 10:02 AM
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Quote:
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I was under the impression that he was asking if you could better the cap if starting totaly from scratch. Which would be hard if using the same footprint.

No, not hard, see above.
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post #30 of 270 Old 06-05-2014, 10:03 AM
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MK,
Trust me not really arguing and have built many projects but have you taken into account the need for tools and paint ect?

I bought pre-finished maple plywood so I didn't bother painting it. There's no point dressing up a coffin.
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