The "JohnnySub" - Page 11 - AVS Forum | Home Theater Discussions And Reviews
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post #301 of 339 Old 12-05-2018, 11:47 AM
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Didn't feel the need to start a new thread for my build. I am building the design in post #288 of this thread, so I figured I would share it here, perhaps as a thanks to those who created it. I needed a customized solution for the exact problem that another poster had in this thread (can't locate it right now) had, which is my screen is 24" from the floor. So the 22" wide design is perfect.

I am using birch plywood, because I prefer a stained wood look over black. Plus, I am hoping to match my Klipsch La Scalas.

I did screw up when making my own cut sheet with the little program on the forums. I accidentally put 2 extra tops/bottoms in there and forgot the double baffle. When I finished cutting all my pieces, I was like, hmmmm, I messed up! LOL. I am debating how to proceed, but right now, I am leaning towards just having the single baffle on there, no insetting the driver, and instead building a grill frame/cloth for it. I have grandchildren, and I think the site of a huge woofer (UM18-22) pulsating would be too inviting for them not to want to touch! More to follow though. I am working my way through it.

So far, everything has gone fine, although, without a huge pile of clamps on hand, building 2 of these is a little slow. But they are being built nonetheless. I will update as necessary, but this is where I am now.

PS. Not sure why the photos are sideways. I am work so can't investigate.
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post #302 of 339 Old 12-07-2018, 07:48 AM
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Congrats on getting things underway! Birch ply all the way!

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post #303 of 339 Old 12-09-2018, 03:00 PM
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Well, I am still chugging along. Been raining like crazy here, and water seeps into my shop when we get over 2". We got like 5". At any rate, I just work around it, being careful to keep everything up off the concrete.

These are "modified Johnny subs", or "Johnny subs for those that have large PJ screens that are 24" from the floor"! LOL. I have seen better construction, so no worries there.

This the first one with the side just sitting on it (so I could show my wife what it will actually look like). As stated earlier, I screwed up and made my cutsheet wrong, leaving out the second baffle. After considering it, and reading that it is only necessary to recess the driver, I decided I would leave the single baffle and create some type of grille to dissuade the grandkids:


This is the same one with the side off. My wife gave me a bunch of old throw pillows that I cut up for the nylon stuffing inside. Looks just like the "Acousta Stuff" that I got from Parts Express awhile back. Anyhow, my plan is to use the bracing as kind of a barrier for the stuffing. Looking for some netting type material that I can staple across the braces to keep it contained. The gray is my attempt at adding some Liquid Nail to try to reinforce things somewhat. It did not go well, as the cool temp had it so thick that by the time I would try to smooth it out with my fingers, it would be close to stiff. Doesn't really need it anyhow, just playing around.


This is box #2 which just got the baffle and top on this morning. I let everything dry overnight. Yes, I was tired of trying to rip some leftover plywood, so I just grabbed some old round stock I have had laying around. (PS. Need more 4' clamps!)


Another angle:


Next steps:
1) order banana jacks. I have some old ones, but they are not long enough.
2) sand on the cabinets a little this week until the jacks come in.
3) begin putting the stuffing in there.
4) glue the sides on
5a) put 1/8, or 1/4 round on the edges. Need to try a scrap piece and see how it looks.
5) stain
6) varnish (maybe, haven't decided yet)
7) install driver

These will lay on there side like in the photo below my screen on top of some rubber discs that I have plenty of at work. Any tips just send'em.
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post #304 of 339 Old 12-09-2018, 03:05 PM
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Do I need to brace the Johnny sub?
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post #305 of 339 Old 12-09-2018, 07:01 PM
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Quote:
Originally Posted by springs113 View Post
Do I need to brace the Johnny sub?
Well, I certainly would. Did you read this thread? Lots of great info. The Johnny is just in between a Marty and MiniMarty. I think most of the gurus here would probably say I don't have enough bracing in mine. The weakest part as I built mine is the top....the only piece that doesn't have a brace on it. So if I am cranking it, and the top flies off, I have nobody to blame but myself...lol.
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post #306 of 339 Old 12-15-2018, 01:18 PM
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Still going. One in the back is getting the side on. One in front is stained with one light coat of polyurethane. Will need multiple coats however, so might be another week. At least the sun came out today.

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post #307 of 339 Old 12-17-2018, 04:43 PM
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Just finalized specs with a my woodworker friend on a "Slim Johnny" subwoofer design. It will be 35"H X 21"W X 24"D with a Dayton 18HO driver. Should be a perfect size to sit up front with my main three Focal speakers. I decided to order a QSC G7 power amp at 1000 watts X2 into 4ohms so I can start with one and add a second in a few months. I asked Santa for a few "sub friendly" UHD blu-rays like Fury and A Quiet Place to show it off. I'll post pics when it is finished.
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post #308 of 339 Old 12-20-2018, 03:44 AM
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@legierk , Good work so far... interested in your take on the finished product as these would fit my specific layout pretty well. Also, whats up with the late 2nd gen Camaro in the background?
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post #309 of 339 Old 12-20-2018, 08:23 AM
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Thanks @mumbles60 . (Not sure how to tag a person). I have about 1 more coat of clear to put on the cabinets before I can install the drivers and get them set up and EQ'd in the theater. I will follow up this weekend with some updated photos. It is a good design. Basically, it is just a little narrower and longer than a regular Johnny. That way, they can sit on their side below the screen. I am a little concerned that the clear I am putting on is so shiny that it may create a distracting reflection while watching. May have to lay some black felt/leather mats on top to reduce the glare. We'll see.

Thanks on the car. That is my main hobby, but it is limited to spring/summer mostly. I prefer the engine building aspect of it, vice the paint/bodywork side of it though. I am mostly finished with the 79, but I am not happy with the satin clear I put on it 4 years ago, so am prepping to re-clear it with gloss sometime in the near future. I did take it on Power Tour in 2016, but have since replaced the 468 with a 496 with fuel injection. It runs great. (PS. I did install huge power amps for the stereo this summer, but have yet to work out the tuning bugs, as I am not happy with the sound when I initially finished the install.)

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post #310 of 339 Old 12-22-2018, 09:13 AM
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OK. Almost there. I could have spent another month sanding and clearing, but at some point, you gotta just call it. Besides, the cool weather made for long dry times. It is nice today however. Installed drivers this morning. Wired coils in series. Here are some pics moving from shop to theater.
Johnny #1 :






Johnny #2 :





In the theater....they will lay sideways below the screen. Match to the La Scalas is pretty close. Wife said La Scalas have a little more red in them.




Now to make the grille frames. Wood already cut, just need to glue. The grilles are because of the grandkids, otherwise I would just leave them like this. Glad I have off til the new year to get all this sorted. This includes moving the two sealed 12" subs to the living room and getting them dialed in.
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post #311 of 339 Old 12-22-2018, 09:42 AM
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Quote:
Originally Posted by legierk View Post
OK. Almost there. I could have spent another month sanding and clearing, but at some point, you gotta just call it. Besides, the cool weather made for long dry times. It is nice today however. Installed drivers this morning. Wired coils in series. Here are some pics moving from shop to theater.
In the theater....they will lay sideways below the screen. Match to the La Scalas is pretty close. Wife said La Scalas have a little more red in them.




Now to make the grille frames. Wood already cut, just need to glue. The grilles are because of the grandkids, otherwise I would just leave them like this. Glad I have off til the new year to get all this sorted. This includes moving the two sealed 12" subs to the living room and getting them dialed in.
Those turned out really nice and match the La Scalas very well. Now turn them up and relax.


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post #312 of 339 Old 12-22-2018, 12:08 PM
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Very nice job legierk. They're going to pound in that room.
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post #313 of 339 Old 12-22-2018, 12:53 PM
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Very nice job legierk. They're going to pound in that room.
Thank you. Got them hooked up in final position here:



Moved the Peaveys where the sealed subs were....on the left:



and the right (under the 805 box):



Don't have time today to calibrate these bad boys, but just left the BFG set to how it was before (which will be totally incorrect for this sub setup) for now:



Equipment rack....I have another QSC amp, but believe it or not, I have popped circuit breakers before. Need to get a long term solution for my power (AC) issues.



View from my seating position. Damn computer is updating and taking awhile. I could pop in a CD/DVD, but will just wait for this thing to finish. I just wanna make sure they actually make noise right now.

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post #314 of 339 Old 12-22-2018, 01:51 PM
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Holy Smokes! First impressions are OMG! Played some Riot (Altar of the King) and my chest was compressed. Then fired up Good Charlotte's Dance Floor Anthem (highly recommended for low bass grooving) and wow! No words. This is Uncalibrated. I am sure if I ran a REW sweep it would be totally jacked up right now, but hey, I was rockin'. Can't wait till I have the time to really dial them in. I also notice that, even being ported, they suck a lot of juice! I had to turn the amp gain up to about 75%. I am sure this will be rectified by a calibration, but they do want their power! Thanks everyone for the guidance!
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post #315 of 339 Old 12-22-2018, 02:53 PM
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Quote:
Originally Posted by legierk View Post
Holy Smokes! First impressions are OMG! Played some Riot (Altar of the King) and my chest was compressed. Then fired up Good Charlotte's Dance Floor Anthem (highly recommended for low bass grooving) and wow! No words. This is Uncalibrated. I am sure if I ran a REW sweep it would be totally jacked up right now, but hey, I was rockin'. Can't wait till I have the time to really dial them in. I also notice that, even being ported, they suck a lot of juice! I had to turn the amp gain up to about 75%. I am sure this will be rectified by a calibration, but they do want their power! Thanks everyone for the guidance!
In most rooms, subs that large would totally dwarf the other speakers but they look perfect next to your La Scalas. Almost like they were both built by Klipsch. Now I'm totally psyched to start playing with my Johnny (that sounds a bit creepy ). Just got it home from the speaker builder this afternoon!
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post #316 of 339 Old 12-22-2018, 09:38 PM
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Legierk, Awesome job on the new additions. I'm liking the stain color choice, and the personalized sign under the center is a nice touch. Extra points too, for still rocking the feedback destroyer. I no longer have mine, and I miss it.
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post #317 of 339 Old 12-26-2018, 09:18 AM
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Wife helped finish the grilles. Came out pretty good. Don't even need any Velcro or anything to hold them in place. They kinda wedge up in there perfectly.



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post #318 of 339 Old 01-01-2019, 04:40 PM
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Hi everyone. I am looking to build JohnnySub and am a little confused with the port. I need your alls help.

Amplifier: NX6000D
Driver: 18- rss460ho-4
Enclosure: Normal Johnny measurements.

How low can I safely go? And what do my measurements need to be for the port to achieve this? Can't seem to find this information. Can I get to 17hz?

Thank you.
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post #319 of 339 Old 01-01-2019, 04:44 PM
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Nice job!

They match those Klipschs perfectly from what I can see.

The grills really blend nicely as well!
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post #320 of 339 Old 01-01-2019, 05:45 PM
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Quote:
Originally Posted by theNEW View Post
Hi everyone. I am looking to build JohnnySub and am a little confused with the port. I need your alls help.

Amplifier: NX6000D
Driver: 18- rss460ho-4
Enclosure: Normal Johnny measurements.

How low can I safely go? And what do my measurements need to be for the port to achieve this? Can't seem to find this information. Can I get to 17hz?

Thank you.
I'm sure you can, but you'll probably lose some SPL the lower you try to tune it. With that being said, I want to say that 18-20Hz is the sweet spot for the 18HO...IIRC.

Hopefully someone else can chime in on this as well.


Darrell
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post #321 of 339 Old 01-01-2019, 06:13 PM
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I'm sure you can, but you'll probably lose some SPL the lower you try to tune it. With that being said, I want to say that 18-20Hz is the sweet spot for the 18HO...IIRC.

Hopefully someone else can chime in on this as well.


Darrell
Thank you for your reply. If that is the case, hopefully I can tune down to 18 maybe 18.5.
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post #322 of 339 Old 01-01-2019, 06:33 PM
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Thank you for your reply. If that is the case, hopefully I can tune down to 18 maybe 18.5.
I'm actually planning to build a pair of these sometime later in the year with the same drivers, so if you get yours started before I do, then hopefully you can start a build thread so I can check out how it works for you.

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post #323 of 339 Old 01-06-2019, 01:52 AM
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The "JohnnySub"

Joining the DIY sub group. Just have bracing and top to finalise. Then in goes the UM18-22.





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post #324 of 339 Old 01-06-2019, 05:05 AM
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Here's one of my beauties. I learned a lot through the process, some things were easy while others were a pain... but im officially done. For now as the cabinet it was spray painted on is another(Marty micro) in the works.
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post #325 of 339 Old 01-07-2019, 09:47 AM
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Just a little bit. You don't want to cover the port with any of the foam. Otherwise looking pretty good!

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post #326 of 339 Old 02-08-2019, 05:55 PM
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Hi, almost done with my JohnnySubs. Will be painting them on Monday. They are almost original size at 24 x 24.5 x 32 inch. They might be the first one sporting a 15 inch Dayton RSS390HF driver. I bought those drivers because I had a 3CH amp with 300wrms @ 4 ohm laying around. I'm now using that amp for my 3 front speakers and I bought a QSC USA 900 with 450wrms @ 4ohm to drive the Johnnys. I did buy a MiniDsp 2X4HD and the mic to tune the things.

It's been a long process since I first plan this project. I'm a first timer working with MDF and I don't have a router or other wood working tools.

I had the 3/4 mdf cuts at a local Home hardware store. They did an ok job at best... wich lead to a more time consuming job fitting the panel...

I made a few mistake to on the first one, but in the end, I'm happy with the result and can't wait to paint them on Monday!

Here are some pics of the process.











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post #327 of 339 Old 02-09-2019, 07:53 AM
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Both your hours are the same size... Was that intentional?
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post #328 of 339 Old 02-09-2019, 04:12 PM
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Quote:
Originally Posted by kennyandersen View Post
Both your hours are the same size... Was that intentional?
Same size = More aesthetically pleasing up front and easier to setup.

Gear: Denon X4400h, Acurus a200X3, QSC RMX1850HD, Klipsch Rp280f, Rp450C, Rp160m, Micca m8-c and dual JohnnySubs with Rss390Hf.
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post #329 of 339 Old 02-09-2019, 04:45 PM
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Holes, both the holes were the same size -- auto correct!! The setup for two holes is less than 5 minutes and the driver is then flush. And though most would find the flush look more attractive, if it passes you that is absolutely the only thing that counts!!
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post #330 of 339 Old 02-09-2019, 06:02 PM
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I tought of flush mounting the driver but my skills with my cheap jigsaw is limited at best. I then tough of buying a rooter to do it properly but I didn't.

If I don't like the look I might do it eventually.

I will be building some bookshelf speakers for the rear surrounds of my 7.4.2 setup so a router might be in the plan. I discovered that I love building stuff!

Gear: Denon X4400h, Acurus a200X3, QSC RMX1850HD, Klipsch Rp280f, Rp450C, Rp160m, Micca m8-c and dual JohnnySubs with Rss390Hf.
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