my 1st HT subwoofer build

[alteredbeast77]

my 1st HT subwoofer build

[alteredbeast77]

more pics.

[alteredbeast77]

and the driver

[Txgrizzly]

wow, nice bracing and i like the way you designed the ports... what driver is that and what did you tune the box to? those are some long ports...

[alteredbeast77]

wow, nice bracing and i like the way you designed the ports... what driver is that and what did you tune the box to? those are some long ports...

thanks Tx, the driver is a alpine 1542 type R 15", the tune is supposed to be 20hz but i'm pretty sure it turned out to be lower

[Hdale85]

Awesome enclosure!

[alteredbeast77]

Awesome enclosure!

thanks Hdale85 i still have a lot of work to do before it's finished

[evilskillit]

Lookin nice. Can't wait to see the finished result.

[dsrviola]

fantastic project!

[bbcmp1979]

Wow, that's a lot of bracing. I don't know how big that box is but it'll be so dead :-).

[alteredbeast77]

Wow, that's a lot of bracing. I don't know how big that box is but it'll be so dead :-).

evilskillit,dsrviola,thank you

bbcmp1979,yes it is completely dead and that was my #1 design goal,it will be a glass top tv stand when it is finished,

the enclosure
all material is 1.5" thick mdf
48"w
24"d
18"h
gross volume 8.2
net volume 5.0
2 ports 1.5"w x 15"h x50"L
tune 20.?? but i think it's lower and that's fine because it sounds awesome,only problem is that even at 300+lb the enclosure moves or wiggles back and forth during loud passages,so i thank i'm going to bolt it through the floor 8O

[engr_dave]

That is indeed a beast, Alteredbeast! Nicely done. I have always wanted to try slot ports. Amazing that your 300lb beast still wants to "walk". To solve this problem with my 15" RSS390HO sealed Daytons, I used 2 drivers at opposing ends to cancel forces. There is no movement whatsoever. I could [should] have used Baltic Birch ply, but went with 1" MDF with 2" baffles anyway. They are about 200lb each (I built two). What are you driving yours with? I chose Crown K2 (2.4kW and no fan!). Works like a champ.

[alteredbeast77]

That is indeed a beast, Alteredbeast! Nicely done. I have always wanted to try slot ports. Amazing that your 300lb beast still wants to "walk". To solve this problem with my 15" RSS390HO sealed Daytons, I used 2 drivers at opposing ends to cancel forces. There is no movement whatsoever. I could [should] have used Baltic Birch ply, but went with 1" MDF with 2" baffles anyway. They are about 200lb each (I built two). What are you driving yours with? I chose Crown K2 (2.4kW and no fan!). Works like a champ.

engr_dave i currently have 1 voice coil (4 ohm) running on a 400w infinity plate amp and that is more than sufficient judging by the output, it moves things in adjacent rooms

i had a EPX2000 with a cleanbox pro but it was cutting out everything below 30hz or so, i tried a couple of different things but was never happy with the sound, so i sent it back, so my new plan is a dayton sa1000w rack mount, running both coils (8 ohm) at 500w, at least that's what it is rated at.

i like the finish on your subs, is it automotive paint ? i have not yet decided how to finish mine, and i still need to figure out what to use on the front of the enclosure to make the sub flush

[engr_dave]

is it automotive paint ?

Yep. Dupont Lucite "diamond black" acrylic lacquer.

I first sprayed a few coats of high-solids lacquer primer-surfacer on the raw MDF (you can see the grayish overspray on the interior). I let it dry (and shrink) thoroughly (like a week or more) and sanded smooth with 320 - then shot three medium coats of black and waited another week. No clearcoat... just color-sanded the black with 600-1200-2000 and finished with polishing compound.

cutting out everything below 30hz or so

There should be lots of good prosound amps that have flat response below 10 Hz. Most amps won't bridge into 2 ohms, but you can simply drive each coil with one channel of a stereo amp.

need to figure out what to use on the front of the enclosure to make the sub flush

With 1-1/2" baffle, you probably have enough meat to recess the driver, at least some...