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Alpine SWR-1223D Slot Ported DIY Sub

post #1 of 15
Thread Starter 
Till the time I get dual Dayton RSS390HO-4 15s for my other project, I thought about resurrecting an old thread and redoing my existing DIY sub (Alpine SWR-1223D) and doing it properly this time.

Earlier I made a test box using cheap chipboard and it performed tremendously off iNuke 6000 dsp limited to 1200 watts peak power up untill -10dBFS on the master volume before the driver compression kicked in. But till -10dBFS, it is fantastic.

My woodworking skills pretty much suck so I took the help of a carpenter.

Um using 1" mdf all around with double front baffle for recess mounting the driver and one window type brace to kill box resonances. I actually wanted to build a bigger box with dual drivers, coz this alpine type r sub models very similar to dual Dayton 390HOs tuned to 20Hz. But Alpine type r went out of stock at the local dealer so decided to build the box with a single driver.

The box is 5 cu ft gross / 3.72 cu ft net with a 2" high, 15" wide, and 42" long slot port. The box is tuned to 21.40Hz. Following are the sims with 1000 watts input power for a 4-ohms load configuration;






Here are the build pics;






























The box is off to paintshop for high gloss finish in black colour. I will post the pics of the finished product by the end of this week hopefully. I hope everything goes as planned.
Edited by braveheart123 - 4/8/13 at 9:44am
post #2 of 15
Thread Starter 
Update

Paint job is finished in high gloss black pearl. The pics don't do justice coz of less than the required lighting and my ordinary photography skills;


















First Impressions

I didn't dial it in properly neither did I rerun audyssey to calibrate the whole system. The bass was stupendous even without calibration, but it was mushy and lacked tactile response. It sort of sounded strangulated. I kept reading on this forum and asking experts if lining the walls of a ported sub was worth it (for my other project though) and got the mixed response.

So, I removed the 1 inch foam lining and cleared all the walls. It is now stupendous amount of effortless bass with taller, wider, and deeper sound stage. The sub easily digs a lot below 20Hz as was evident while checking the last scene of Battle LA. The Alpine belted out some ferocious sub-sonic shock waves without calibration. Overall fantastic.

Now enough of ranting..... I will post the FR when I run REW and tame it with BFD. It will be a while though, coz um starting my other project this weekend with dual Dayton Audio RSS390 HO drivers.
Edited by braveheart123 - 4/16/13 at 11:48am
post #3 of 15
That is one nice looking sub! May I be nosy and ask how much $$ the paint job was?
post #4 of 15
Thread Starter 
Thanx for the compliment. It equates to $150 after currency conversion.
post #5 of 15
Nice job!
post #6 of 15
+1
post #7 of 15
Thread Starter 
Managed to take the first FR today at the main LP with audyssey and mains engaged;



The suckout at 67Hz is due to coil inductance. The response is a bit ruffled up 60Hz and above, but that's a placement issue. Anyway as I thought, Mr Alpine does dig down to 15Hz with authority......not bad!!!! wink.gif
Edited by braveheart123 - 5/3/13 at 5:29am
post #8 of 15
"I removed the 1 inch foam lining and cleared all the walls..."

that's really interesting. the foam was probably acting like some sort of shock absorber flexing with each pulse of the woofer, kind of like a poorly constructed cabinet where the actual volume of the cabinet is changing slightly with each hit.

"The suckout at 67Hz is due to coil inductance..."

what does this mean?
post #9 of 15
OP- can you tell me how the paint guys got such a nice finish? Do you know the steps involved? I would seriously like to do that with my sub cabinets as mine are currently unfinished.
That is a really nice finish that your paint guys did on that bad boy!
post #10 of 15
Thread Starter 
Quote:
Originally Posted by LTD02 View Post


what does this mean?

This response was taken at an inch from the center of the cone. It doesn't include port contribution. I think the two ripples are due to vc inductance or box resonance, but I may be wrong.


Edited by braveheart123 - 5/3/13 at 6:00am
post #11 of 15
Thread Starter 
Quote:
Originally Posted by Martycool007 View Post

OP- can you tell me how the paint guys got such a nice finish? Do you know the steps involved? I would seriously like to do that with my sub cabinets as mine are currently unfinished.
That is a really nice finish that your paint guys did on that bad boy!

Initially I had sent the box to paint shop, but later I decided to get the job done at home. So, saw the whole process as appended below;

  1. Filling of all the minor gaps and screw holes with steel putty. The objective was to fill the joints and make it look like one piece from all sides
  2. Sanded to level all the surfaces.
  3. Primed the surface with car primer > sanded > primed again > sanded > primed again
  4. Applied 3 coats of car paint (Pearl Black metallic paint with tiny golden particles that shine in light), followed by three coats of hardener.
  5. Sanded the surface with 2000 grit sandpaper using water to remove tiny dust particles that got stuck when hardener was wet.
  6. Applied cutting cream to further remove any dust particles and bring out the tiny golden particles.
  7. Finally applied metallic polish (Soft 99 Pearl & Metallic) and buffed it till it looked like a mirror.

On a side note, have a look at this builder. He pulled off a fantastic job............http://www.shootingboard.net/2012/11/home-theater-subwoofer.html

If i ever have to do it again, I won't do high gloss ever on the entire box. It is way too laborious. I'd rather do the high gloss on the front panel only, rest will be veneered just like the link above.
post #12 of 15

...


Edited by htsub - 11/16/13 at 8:31am
post #13 of 15
Very Nice Braveheart! Those Alpine R 12s and 15s have decent specs and I wondered how well they would work for HT.
Thanks for sharing.
post #14 of 15
that sub looks awesome!! great fit and finish. very professional looking
post #15 of 15
Well done. Gotta love DIY
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