Sealed HS-24 Build - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 13 Old 12-16-2018, 09:32 PM - Thread Starter
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Sealed HS-24 Build

I wanted to share with everyone the build I finished this weekend. I've been building it the last couple of months. I knew it was going to take a bit for the driver to come in so I took my time and was working mainly on the weekends. The way I finished it also took a couple weeks to do thanks to giving it ample time to dry on each coat.

On Thursday my HS-24 mk III driver was delivered so I was able to finally finish it off. First off it's huge. I knew it was big but until you actually see and try to lift one... My dog in the picture is an 85 pound lab and she looks tiny. Help should be had when moving it. I made the mistake of being over eager and did it by myself which I'm paying for now with a tweaked back.

I did figure out one trick though for getting it and out of the box for drilling the mount holes. The FAQ thread gives the tip of putting zip ties through two of the holes to lift. That wasn't going to work with the weight of it. A zip tie was going to cut a finger off. But I was able to modify off of it. I put two ties through two opposite holes to get a little more strength. Then through each set I put a heavy duty micro-fiber tower that I could grip. It ended up giving me a handle on each side that control lowering it into the box and then picking it back out.



For the cabinet I made it out of 3/4" baltic birch plywood. The hardwood store I shop at was having a big sale so I went with it instead of using MDF. I then add a top and trim to it made from curly maple. I've like the look of figured wood for subs since I first saw pictures of a couple subs from Funk.

I'm not going to bore too much with construction pictures. Since it's sealed it's a rectangular box with fairly standard windowed bracing inside. I can follow up with some pictures of that if anyone wants to see it.



Due to the size of it and that it's going to be in a spot that can be seen I wanted to give it a nice finish. For the body, after a thorough sanding I gave it a heavy dose of a black cherry stain. It was then topped with three coats of satin arm-r-seal urethane.



For the trim and top I wanted to make the curls in the curly maple really pop. So I died it black and then sanded off the dye. This leaves some color in the curls but brings the rest back to natural. I did 4 coats like this to get the curls nice and dark. For the final coat I didn't fully sand it down. I sanded it just enough to give the wood a smokey gray color. I didn't take pictures during these steps and I'm really kicking myself now. I wish I had it documented for the future.

Once the last coat of black was done I added a light layer of purple dye over it. Some extra purple, black, and alcohol (removes dye) was finally used in spots to even out the color and look. This picture is right after the purple was added and it was drying.



All of the curly maple was then finished with 4 coats of a tung oil finish and then a wood wax. I'm really happy with the way the finish turned out on it.




So far the sound is great. I did a basic setup of it last night and ran Audyssey on it. All the demo scenes I played sounded great. The server scene from pulse felt like it was barely stressing it. A couple of the things in my room got stressed out though. I then watched RP1 and everything was amazing in it. The big explosion near the end was amazing.

I dialed everything in a bit more today and I'm going to go watch a movie now before bed. I can't wait to hear it some more.
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post #2 of 13 Old 12-16-2018, 10:07 PM
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Man,

I really like this simple yet monstrous sub build. The purple dye job looks great. What amplifier are you using it with?
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post #3 of 13 Old 12-17-2018, 07:17 AM
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Hey nice job on the finish. I do love curly maple. My dad use to build flintlock rifles out of that and it was beautiful. What did you end up with for a rough inteneral volume? And did you line the walls or fill with polyfill at all? And last what did you use for a amp? I am getting ready to buy one for mine and i am planning to get a fp20000q just not sure if it is overkill.
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post #4 of 13 Old 12-17-2018, 07:23 AM
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Quote:
Originally Posted by Randy_J View Post
And last what did you use for a amp? I am getting ready to buy one for mine and i am planning to get a fp20000q just not sure if it is overkill.
You are in the wrong forum for overkill. Always get more than you need at every level. Headroom is king!

The clone amps are CHEAP and capable.
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post #5 of 13 Old 12-17-2018, 07:42 AM
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Originally Posted by jpmst3 View Post
You are in the wrong forum for overkill. Always get more than you need at every level. Headroom is king!

The clone amps are CHEAP and capable.

LOL I know you are right. I am just not sure what i am going to do with the other 2 channels yet. If I get the chance i think I might run the whole set pu on clone power. It is a lot cheaper and it would be nice to not have to worry about running out of power. I have issues with overkill and my wife tries to keep me under control. I like making pizza a d wound up with a woodfired brick pizza oven 6k$ later. So i know what overkill is and the reason for it. I wouldn't have ended up with a pair of Hs-24 subs if i wasn't in to overkill.
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post #6 of 13 Old 12-17-2018, 07:48 AM
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Originally Posted by Randy_J View Post
LOL I know you are right. I am just not sure what i am going to do with the other 2 channels yet. If I get the chance i think I might run the whole set pu on clone power. It is a lot cheaper and it would be nice to not have to worry about running out of power. I have issues with overkill and my wife tries to keep me under control. I like making pizza a d wound up with a woodfired brick pizza oven 6k$ later. So i know what overkill is and the reason for it. I wouldn't have ended up with a pair of Hs-24 subs if i wasn't in to overkill.
Nice! You are in the right place then!

The answer is obvious, add another sub!! OR go with the 14K and bridge it.

One sub is a lonely life.
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post #7 of 13 Old 12-17-2018, 08:17 AM
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Quote:
Originally Posted by DesertDog View Post
I wanted to share with everyone the build I finished this weekend.



All of the curly maple was then finished with 4 coats of a tung oil finish and then a wood wax. I'm really happy with the way the finish turned out on it.

Wow, looks brilliant!

Curly Maple was a favorite of mine to finish when I was in woodworking, and with your choice of dye, it almost looks like a highly figured piece of Purpleheart. That’s certainly a one of a kind subwoofer. Bravo!

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post #8 of 13 Old 12-17-2018, 09:07 AM - Thread Starter
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Quote:
Originally Posted by Randy_J View Post
Hey nice job on the finish. I do love curly maple. My dad use to build flintlock rifles out of that and it was beautiful. What did you end up with for a rough inteneral volume? And did you line the walls or fill with polyfill at all? And last what did you use for a amp? I am getting ready to buy one for mine and i am planning to get a fp20000q just not sure if it is overkill.
Thanks! It ended up about 9.4 CF not counting the fill. Right in the range Nick was recommending. I stuffed the side cavities, behind the bracing with poly and left area around the driver empty.

For the amp I'm using a Crown 2502. Nick had recommended it as the budget friendly option or a speaker power amp if budget didn't matter. So far it seems up to the task. Pulse's server room played with no problem at -2 on my AVR. Last night I watched Edge of Tomorrow and the bass hit at the start of it was AMAZING. I had to rewatch the scene just so I could watch the speaker do it's thing.

Quote:
Originally Posted by Sekosche View Post
Wow, looks brilliant!

Curly Maple was a favorite of mine to finish when I was in woodworking, and with your choice of dye, it almost looks like a highly figured piece of Purpleheart. That’s certainly a one of a kind subwoofer. Bravo!
Thanks! It's funny you mention Purpleheart. I almost did it in. My wood store had it on sale for slightly less then the curly maple when I was buying the wood. I wanted to get the figure though for this project so I stuck with the curly maple.
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post #9 of 13 Old 12-17-2018, 03:10 PM
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The best thing about the 24's is their ability to absorb power without bottoming or melting.
Levels that would damage even a 21 and totally toast an 18.

That difference can be the difference between life and death when booming hard.
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post #10 of 13 Old 12-18-2018, 06:18 PM
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Quote:
Originally Posted by DesertDog View Post
All of the curly maple was then finished with 4 coats of a tung oil finish and then a wood wax. I'm really happy with the way the finish turned out on it.
As others have said, wow, looks like purpleheart! Nice.

I know Overkill is the second Motorhead album. Other than that, is there any other form of it?
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post #11 of 13 Old 12-23-2018, 02:00 PM - Thread Starter
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Watching a large sub move is mesmerizing. The opening of Edge of Tomorrow gets it moving nicely.

And in slow motion.
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post #12 of 13 Old 12-23-2018, 05:14 PM
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Originally Posted by DesertDog View Post
Watching a large sub move is mesmerizing. The opening of Edge of Tomorrow gets it moving nicely.

That's crazy that you mentioned that movie.. I just watched it last night with my newly finished subs, and it totally caught me by surprise. I never had a clue (with my old subs) the depth and level of bass in the opening sequence. Had to back it up and replay it 3 times before my ears would believe it!

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post #13 of 13 Old 12-23-2018, 05:24 PM - Thread Starter
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That's crazy that you mentioned that movie.. I just watched it last night with my newly finished subs, and it totally caught me by surprise. I never had a clue (with my old subs) the depth and level of bass in the opening sequence. Had to back it up and replay it 3 times before my ears would believe it!
Same here! I knew the movie had bass but I didn't know it had that right at the start. I had to watch it multiple times that first night too. Then I come home from work the next day and had to film just to see it again.
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