Subwoofer Saturday! - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 26 Old 01-19-2019, 08:52 PM - Thread Starter
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Subwoofer Saturday!

Oh yeah! You heard me right! Sub-Woof-Er-Sat-Ur-Day!!!



I have two projects lined up for you guys.



First off! A UM18-22 in a Full Marty Cabinet... but BIGGER! This subwoofer is for my bedroom's 2.1 system which will are Ascend Acoustics CMT340's soon to be paired with my "Fuller Marty" if you may.



Second! Two Dayton SD215-88's in a 2.5 cuf cabinet tuned to 35 hz! This subwoofer is for my Dad's 2018 Civic Si. Goal was clean, undistorted sound in a smallish form factor. And needed to be cheap. This marked every box.



---------------------------



So to start off, I'll talk a bit more about the Dual 8" subwoofer. Recently I decided to take these two bookshelf speakers with 10" woofers and wire them to the subwoofer in the back of the civic. Worked great, so much more output than the stock 7" thing that you can barely call a subwoofer. Unfortunately those bookshelves are extremely big and my dad was quite mad they took up so much of his trunk. So I proposed an actual subwoofer that had a smaller form factor but just as much, if not more output. It also needed to be cheap. So I took to Parts Express and started looking. Found Dayton Audio's SD215-88 Drivers which were priced at $30 a piece, didn't want a huge box, and had good output. Bang, done. So here I am cutting wood for the Fuller Marty and I think to myself "Wait there is enough scraps here to build another subwoofer box" and that box is this box which will house the two 8" subwoofers.



Alright now to the Fuller Marty. So I currently listen to music in my room in two channel with my Ascend CMT340's. Really fantastic, these speakers sound great in two channel with no subwoofer. But I know what a subwoofer could do for this system so I took to the forums looking for good builds for ULF and high output while staying relatively simple and cheap (You won't find me building a horn loaded subwoofer anytime soon!) and found the Full Marty. I thought hey, this design is good but I think I can do a little better. Since this subwoofer would be going inside my closet, I have a max Height of 64". The Full Marty only went to 48" and by now I'm sure you guys know what I was thinking So yes I made the box 16" taller and lowered the port tune to about 15hz. So its a "Fuller" Marty



--------------------------



So here is the cut list for the Fuller Marty:





I do not have a cut list for the other subwoofer because I actually drafted and designed it on the spot (Yes, I'm just thaaaaat amazing )



--------------------------



Alright here is the wood which we finished cutting. The bottom most is the Full Marty. Then there are some cuts of birch plywood for my Blast Box project. I had three sheets of MDF total to use, and we still have a bit of extra for any extra bracing I may feel the need to add in.





We resume tomorrow to assemble it all. Including the Blast Box: Extreme Edition.



Thanks for reading, if you have any questions or comments, let me know!

Leave it at 8 ohms and call it a day :)

Last edited by Russdawg1; 01-19-2019 at 09:04 PM.
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post #2 of 26 Old 01-20-2019, 11:52 AM
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Yes but... Can we not just call them normal/regular/plain/everyday ported boxes yet?




Ported boxes are like Ketchup, be around since 1702, well before the internet or whatever the hell a Marty Full thing is...
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post #3 of 26 Old 01-20-2019, 12:41 PM
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Unless of course it is LLT big....
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post #4 of 26 Old 01-20-2019, 01:49 PM
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Quote:
Originally Posted by BassThatHz View Post
Yes but... Can we not just call them normal/regular/plain/everyday ported boxes yet?




Ported boxes are like Ketchup, be around since 1702, well before the internet or whatever the hell a Marty Full thing is...
but maybe martys are catsup...…
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post #5 of 26 Old 01-20-2019, 03:18 PM
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but maybe martys are catsup...…
Or Kleenex.
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post #6 of 26 Old 01-20-2019, 03:57 PM
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Unrelated but related, the acoustic suspension (sealed) box has only been around 1954.

Why do I feel like history is a scam? How the hell has it been less than an average lifetime ago that someone said "hmm, but what if we put it in a box?". Sometimes I feel like we aren't really that technologically advanced. Earth has been here 4.5 billion years ago and everything has happened in the last 100 years.

Matrix....its real.

Edit: Sorry I've had a long isolated day in the midwest, oh and watched gladiator. I really dont know how this plastic thing I'm typing on with my thumbs even works right now, or what day it is.
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post #7 of 26 Old 01-20-2019, 04:43 PM - Thread Starter
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Quote:
Originally Posted by BassThatHz View Post
Yes but... Can we not just call them normal/regular/plain/everyday ported boxes yet?









Ported boxes are like Ketchup, be around since 1702, well before the internet or whatever the hell a Marty Full thing is...

Gosh darn it BTH. I can’t put a 30 cubic foot cabinet in my room I thought 15 cubic feet would be enough to satisfy most

I will design a bigger one eventually. MARK. MY. WORDS. And it WILL be the Fullest Martyest of them ALL

Leave it at 8 ohms and call it a day :)
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post #8 of 26 Old 01-20-2019, 04:45 PM - Thread Starter
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Originally Posted by darknite9099 View Post
Or Kleenex.


Quote:
Originally Posted by VegaMan View Post
but maybe martys are catsup...…

I was thinking more like wheels

Leave it at 8 ohms and call it a day :)
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post #9 of 26 Old 01-20-2019, 06:17 PM
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Quote:
Originally Posted by trilkb View Post
Unrelated but related, the acoustic suspension (sealed) box has only been around 1954.

Why do I feel like history is a scam? How the hell has it been less than an average lifetime ago that someone said "hmm, but what if we put it in a box?". Sometimes I feel like we aren't really that technologically advanced. Earth has been here 4.5 billion years ago and everything has happened in the last 100 years.

Matrix....its real.

Edit: Sorry I've had a long isolated day in the midwest, oh and watched gladiator. I really dont know how this plastic thing I'm typing on with my thumbs even works right now, or what day it is.



Fun fact the ported box came before the sealed box.
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post #10 of 26 Old 02-09-2019, 10:10 PM - Thread Starter
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Subwoofer Saturday!

Alright alright... yes I’ve been slacking for a while on this topic...

But I got off my ass today and started gluing!





Here’s one with my “extreme” Blast Box in the back:





For the record I didn’t even plan on putting bracing in:



And here’s the final piece being put on:



I’ll definitely need to sand that piece but other than that, I think I did quite a good job... still needs improvement though... but that’s why I have the Fuller Marty on deck

Have a good night all
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Leave it at 8 ohms and call it a day :)

Last edited by Russdawg1; 02-09-2019 at 10:25 PM.
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post #11 of 26 Old 02-17-2019, 09:54 AM
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Originally Posted by Russdawg1 View Post
Alright alright... yes I’ve been slacking for a while on this topic...

But I got off my ass today and started gluing!

For the record I didn’t even plan on putting bracing in:


Guess that explains why there is not that much.
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post #12 of 26 Old 02-17-2019, 09:56 AM - Thread Starter
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Guess that explains why there is not that much.

Yep

Leave it at 8 ohms and call it a day :)
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post #13 of 26 Old 02-17-2019, 09:59 AM - Thread Starter
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Anyways I forgot to update last week, here are some finished photos:





Inside was fully caulked and I’m actually quite satisfied with the performance. This thing kicks ass in the back of my dads civic and cost us $60 dollars total...

Only drawback is I made the enclosure a bit too large so it doesn’t fit correctly in the back
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Leave it at 8 ohms and call it a day :)
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post #14 of 26 Old 02-17-2019, 10:26 AM
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Only drawback is I made the enclosure a bit too large so it doesn’t fit correctly in the back

The expression "Measure twice, cut once" comes to mind....
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post #15 of 26 Old 02-17-2019, 10:39 AM - Thread Starter
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The expression "Measure twice, cut once" comes to mind....

Well it did fit my measurements which were correct but I didn’t factor in the part that the trunk is trapezoidal... so it clips part of the trim on the inside but like I said, it’s a civic, so it’s cheap and bends easily so we just shoved it in and didn’t look back

You live and you learn

Leave it at 8 ohms and call it a day :)
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post #16 of 26 Old 02-23-2019, 06:01 PM - Thread Starter
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Oh forgot to update you guys, here’s where we’re at on the build:



I have no idea what those braces are, I just grabbed some wood laying around and screwed it in. All I know is that it’s stiff as hell. That thing will not flex whatsoever. I’m going to put a vertical and two more horizontal ones in soon.

This subfloor flue is solid. And I also decided to screw it in for extra stability, filling in the screw holes with filler, this project should turn out much better than my others

Here’s some more photos:







Hoping to get this finished tomorrow. I’ll take more photos tomorrow also.

Leave it at 8 ohms and call it a day :)
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post #17 of 26 Old 02-24-2019, 11:31 PM
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Looks good, and even better is you didn't sweat the small stuff. All to often you see people who give up on projects because something didn't come out perfect. You had an idea and ran (sprinted?) with it, perfect.
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post #18 of 26 Old 02-25-2019, 06:56 AM - Thread Starter
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Looks good, and even better is you didn't sweat the small stuff. All to often you see people who give up on projects because something didn't come out perfect. You had an idea and ran (sprinted?) with it, perfect.

Haha well I spent 3 days on this stupid thing and I actually have a cold now from exerting all this effort on this stupid thing in the cold. There was no way I wasn’t finishing this thing.

Leave it at 8 ohms and call it a day :)
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post #19 of 26 Old 02-25-2019, 07:04 AM - Thread Starter
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Alright people it’s finished!







This thing is ginormous. I mean that’s a normal sized full-atx PC right there. But it sounds fantastic

I’ll probably “finish finish” it in a week or two when I decide on a paint. I’m thinking gloss white
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Leave it at 8 ohms and call it a day :)
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post #20 of 26 Old 02-25-2019, 07:50 AM
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If you have a spinner in that PC I'd move it away from that sub.

Or replace it with a SSD, also tighten your brass risers on the MB as the ULF will unseat those.
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post #21 of 26 Old 02-25-2019, 07:53 AM - Thread Starter
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If you have a spinner in that PC I'd move it away from that sub.



Or replace it with a SSD, also tighten your brass risers on the MB as the ULF will unseat those.

Yeah I’m going to reorganize my room when I get the chance, just laying in bed drinking OJ until I feel less like sh*t
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Leave it at 8 ohms and call it a day :)
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post #22 of 26 Old 02-25-2019, 07:55 AM
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Yeah I’m going to reorganize my room when I get the chance, just laying in bed drinking OJ until I feel less like sh*t
Feel better dude, go annoy your parents/neighbors with the new sub.
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post #23 of 26 Old 05-11-2019, 05:15 PM - Thread Starter
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Haha I’m back! Yet another subwoofer Saturday!





Halfway done with the first box, going to do the next box another Saturday

It’s about 3 cuf total, for both subs. Will be filling with 5lb of poly stuff.

Used a table saw this time. Much better results. And much quicker. Of course this box is a whole lot smaller than my “Fuller Marty”.

Leave it at 8 ohms and call it a day :)
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post #24 of 26 Old 05-13-2019, 12:36 PM
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Cheese in crepes dude, what thickness MDF is that? And where do you get it?
It looks like 1 inch, unless it is just trick photography. I can't find anything over 3/4 locally. I'd have to special order it at any of the big box stores, and they may not even allow me to do that.
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post #25 of 26 Old 05-13-2019, 12:49 PM - Thread Starter
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Cheese in crepes dude, what thickness MDF is that? And where do you get it?
It looks like 1 inch, unless it is just trick photography. I can't find anything over 3/4 locally. I'd have to special order it at any of the big box stores, and they may not even allow me to do that.

Oh it’s actually just 1/2”. Stacked

I guess the identical cuts are pretty convincing.

I didn’t want a tank of a box like the last one, so using thinner wood but with braces was the better move.



Here’s the sorta finished product in the civic. Very nice fit. Will be sanding and carpeting eventually.

Leave it at 8 ohms and call it a day :)
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post #26 of 26 Old 05-13-2019, 01:25 PM
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Quote:
Originally Posted by BassThatHz View Post
Yes but... Can we not just call them normal/regular/plain/everyday ported boxes yet?




Ported boxes are like Ketchup, be around since 1702, well before the internet or whatever the hell a Marty Full thing is...
So is a mini-marty like reduced sugar ketchup?
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