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Building Parts Express' Triska Sub

specialidiot

Break Glass, Smoke Lucky
I love my office system, but the Sequerra monitors need a little help down low. My office is pretty small, only 9x9 with one large window, wood floors, and plaster walls. Since I compete for TV and listening time in the living room with my wife and daughter, I'm usually holed up in here listening to tunes or watching movies or TV off of my mac mini.

I'd been watching CL for a small sub, then while browsing PE's projects page I decided to build the Triska Sub.

Ordering was easy, the 70 watt plate amp, 2 passives and the 8" woofer, as well as a small sheet of egg crate foam took only a few clicks and $108. I bought a full sheet of 3/4" MDF at Home Depot for $18 and ejfud (Gary) gladly cut them to size for me.

Other stuff I bought: 15 8-32x3/4" black wood screws to attach the woofer and PRs, rubber "feet" for the bottom, and some speaker caulk form Midwest Speaker in St Paul.

The box itself is 13" square, pretty small. Here it is in clamps, glued and screwed. I used corner clamps on top, and one of the end caps on the bottom to keep it square to the world.

boxclamped.jpg


Once I added the end caps, I cut the openings with a jig saw according to the template provided. I wasn't too worried about accuracy but I did have to hog out the plate amp opening a bit to get a proper fit.

boxholed.jpg


I painted it using a textured Rustoleum rattle can thing. Looking back I should have used something else, the texture grabs dust and lint like crazy. You can see the sawdust remnants in the finished pics.

boxpainted.jpg


All that was left was to screw in the plate amp, passives, and woofer. ShawnA (designer of the sub) provided some email assistance in adding mass to the PRs. Just add 8 washers to an M5 screw and locktite them in.

boxdone1.jpg

boxdone2.jpg


I've been listening to it for about 45 minutes now, using the pre-amp out of my Bel Canto to feed the plate amp. No, it doesn't thump, but I now have the right amount of bottom to my tunes!

Total time, about 3 hours. Total cost, about $150.

Thanks to Gary for the MDF cuts, and the listening session of his Curly Cornwalls!
 
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I love projects like that. Very cool.

Too bad I suck at woodworking unless I have the freaking new yankee workshop at my disposal.

Evan
 
That looks great! I'm sure it adds enough low end for that small a room.

How low do you think it goes?

My pleasure to help out as well.
 
Looks great, SI. The textured paint came out looking very nice.

One suggestion...if you're going to stick it under the desk and use it as a potential footstool then you might want to add some grillage to keep from putting a foot in one of the drivers. I seem to recall the author of that project using it under the desk. Of course, wrong is kind of a state of being for me.

Ray
 
thanks to all for your comments. I left town right after posting the pictures and just got back. It was a great visit in the north woods of Wisconsin.

240 guy, You Can Do It. Really, it wasn't hard at all. The way I saw it, if I screwed up the enclosure, I'd get to visit Gary's shop again.

Ray - yeah its under my desk. But I put it in a spot where my feet shouldn't reach it. I should probably get grilles for it. Got any of those fridge things left?
 
Ray - yeah its under my desk. But I put it in a spot where my feet shouldn't reach it. I should probably get grilles for it. Got any of those fridge things left?

Stinkin' amateurs. Get your terminology straight. Those are cooling racks for cookies, not "fridge things". Sheesh. ;)

For those that missed that little bit of an obscure thread, he's talking about the grills on my black monstrosities that you can see here. I was wandering through Walmart looking for something cheap and easy that I could stick on the front of the speakers to keep the kids balls, swords, airplanes, etc. from massacring the drivers. The work pretty well but they can still poke through to the dustcaps if they try. One of these days I'll finish those...or maybe not. The nekkid ones in the pic now have real grilles.

Anyway, for about a buck-three eighty five you could have a set just like 'em.

Ray
 
That looks great! I'm sure it adds enough low end for that small a room.

How low do you think it goes?

My pleasure to help out as well.


Gary, I was away until last night, so no real listening session until just now.

Its a great amount of low end. I just listened to an obscure CD I have: Opie Gone Bad - a band from Denver that has a great bass groove to it. Once I got the sub in the right location it really holds it own.

According to the designer:
"It has an F3 of around 40 Hz and a F10 around 31 Hz. The rolloff is steep but it all works out well in the end."

so around 30Hz, which should be fine for music.
 
More than low enough for most music.

You'll probably miss it when you have the rap cranked though.:lmao:
 
Nice work. I used the same small plate amp for a 10" subwoofer project and for moderate levels, it is just fine.
 
I just finished building my Triska per your recommendation. It came out quite nice, but I have yet to veneer it. Since it's going to live under my desk, there's a good change it may never get finished.

I'm not sure what to use for washers on the backs of the radiators. You suggest using 8 on an m5 bolt. Did you use the bolt that came with the radiators? What is the diameter of the washers? Wish I had a scale capable of weighing them!

Thanks again for pointing me to this sub. It should be perfect for my computer. I like its compact size and easy construction. Don
 
I'm not sure what to use for washers on the backs of the radiators. You suggest using 8 on an m5 bolt. Did you use the bolt that came with the radiators? What is the diameter of the washers? Wish I had a scale capable of weighing them!

I can't remember what I had for lunch yesterday...... But I'm pretty sure I just rummaged around in my basement until I found the size that fits over the screw that came with it. Sorry I can't be of more help.

Here is a snippet from the project page from partsexpress.com

The amount of added mass turned out to be 46 to 50 grams per radiator. The passives have an M5 threaded hole to adjust mass by way of a bolt, nuts, and washers. Just make sure you add weight in this range. It's the best compromise between system power handling and frequency response I have found so far. Once you are satisfied with the mass tuning, grab a bottle of Loctite and secure the threads.

So yeah I'm sure you wish you had a scale but I don't think its rocket science either.

I'm glad I didn't veneer mine, but I really should get some of rayw's cookie racks on them.
 
Wow, that came out really nice! I think it looks great. And 30 Hz is pretty darn good for an 8" sub! I'd be tempted to build one for kicks for my bedroom system. Question - could you have gone smaller with the cab? If not, what was the limiting factor? Speaker parameters? Speakers running into eachother inside?
 
Wow, that came out really nice! I think it looks great. And 30 Hz is pretty darn good for an 8" sub! I'd be tempted to build one for kicks for my bedroom system. Question - could you have gone smaller with the cab? If not, what was the limiting factor? Speaker parameters? Speakers running into eachother inside?

Wow Aaron I just don't know the answer to your questions! I just followed the plan on PE's project pages. There is plenty of room in the enclosure. But you'd be a little limited on size for the plate amp if you went any smaller.

If I ever get over to hear your rig I could bring it with for an audition.
 
I'm a fan of packing as much slam into as small of a space as possible. I think it would be cool to go as small as you could with the box, provided performance didn't suffer. Looks like you could trim an inch or two off each side, for an 11X11X11 cube. I'd definitely be interested in hearing that thing.
 
The limiting factor for that sub would be the mass added to the PRs. When you go smaller with the box you have to go heavier on the passives. At some point you'll have enough weight to sag the PRs.

Ray
 
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