My new SDX15 is thumpin away. *Pics*

[blktre]

Just finished up my new 4.4cf sealed SDX15 sub. Its still in the testing faze. I'm waiting for Stangbat to stop by and setup the FBQ2496 in REW before I finish the box. I really enjoyed the research and design. It was a heck of a ride for my first sub build. Thanks to Stangbat for bouncing ideas off of and Jeff's Bagby's Woofer spreadsheet. And Jim Holts sub was my inspiration. Thanks for the audition Jim.

I did have some problems along the way. For example, the Pio VSX im using as a processor (being replaced w/a Emo UMC-1) did not have enuff signal to run the 2496 and Ep2500. Im kinda hung up on the idea of adding a second SDX15 or add some PR's to my existing box down the road. Who knows.

An Art Cleanbox was modded and installed. I had the dreaded feedback hum caused from a ground loop from my cable. Got it fixed w/a Janzen isolator. And even without REW being introduced, I am loving the tight, clean, house shaking bass this design puts out. It really compliments music and HT will give you that queasy feeling in your stomach. Its really is a dual Music/HT sub i was looking for.

Here are a few pics.

I used pocket screws in 3/4" plywood for this project. The box was big enough for my drill during assembly. I don't have many clamps so the pocket screws really helped with hiding screw heads making body work much easier.



Here is the internal support I used.


1.5" baffle being laminated.

I welded together a cantilevered shelf for the 2496 and the Ep2500.



Thanks for looking...
Andy

[Dirk]

Re: My new SDX15 is thumpin away. *Pics*

That monster doesn't bend the guns in your RPTV? Color me surprised!

[blktre]

Re: My new SDX15 is thumpin away. *Pics*

That monster doesn't bend the guns in your RPTV? Color me surprised!

Haha. You know, that actually was a concern of mine. Running test tones below 20Hz didn't seem to faze it at all. When i get the driver blowing flick "Iron Man", we will see if it passes the test.

[Dirk]

Re: My new SDX15 is thumpin away. *Pics*

Well, my personal experiences say that just the act of having that magnet in such close proximity to the guns should be throwing off your convergence. But if it was you would know it already. :D

Rock on!

[blktre]

Re: My new SDX15 is thumpin away. *Pics*

Well, my personal experiences say that just the act of having that magnet in such close proximity to the guns should be throwing off your convergence. But if it was you would know it already. :D

Rock on!

Ive tested the sub on a few outtakes on some selected movies, no problems. Ive watched a little HDTV and noticed no problems. But i don't plan on using the sub on TV anyways. I did watch one movie in its entirety with zero problems, but it was not a sub healthy chick flick.
Time will tell in the long term. Even if it does, i have room to move it.

[Jim Holtz]

Re: My new SDX15 is thumpin away. *Pics*

Hi Andy,

The sub looks great! I'm glad your short listening session to my system was helpful.

Jim

[critofur]

Re: My new SDX15 is thumpin away. *Pics*

Ive tested the sub on a few outtakes on some selected movies, no problems. Ive watched a little HDTV and noticed no problems. But i don't plan on using the sub on TV anyways. I did watch one movie in its entirety with zero problems, but it was not a sub healthy chick flick.
Time will tell in the long term. Even if it does, i have room to move it.

They still don't understand Dirk... What he [Dirk] means is the sub's MAGNET which most likely isn't shielded. Doesn't matter if the sub is ON or not. Unshielded speaker magnets can bend the electron beams in CRTs. If it's not happening now, it won't happen later either.

I'm about to build some subs soon myself. How do you like that amp and what do you think of the 2496?

[nick29498141]

Re: My new SDX15 is thumpin away. *Pics*

Nice sub, and great-looking set-up!

If it where me, I'd move the speakers to the insides, and push the rack and sub to the outsides, to focus the soundstage.



NK

[blktre]

Re: My new SDX15 is thumpin away. *Pics*

Doesn't matter if the sub is ON or not.

Duhhhh, Andy *slaps myself*

I'm about to build some subs soon myself. How do you like that amp and what do you think of the 2496?

How do I like the 2496? Well, I don't have alot of experience with it so far. It is a little difficult to figure out. The manual isn't all that great for new folks like myself. I finally figured out the PEQ and how to set the filters. Once Stangbat runs REW for me (he understand the program better than i do) I will have a much better opinion of the 2496. On paper, it cant be beat. Love the amp and its potential. There's alot to be said about headroom and a driver than can handle some power.

If it where me, I'd move the speakers to the insides, and push the rack and sub to the outsides, to focus the soundstage.

Nick,
My front soundstage wall is 13ft wide. Right now the towers are 1.5ft in from the side walls. I moved these things all over to get the imaging and full soundstage from those i was looking for. I'm not willing to scoot the towers any closer than they currently are.

When the CRT gets replaced with either a 60" wall mounted LCD or projector, then I will have some space to play with speaker alignment as the gear rack will be front and center below the screen. Until then, this is what I have to work with. You would be surprised at the soundstage as it currently is. REW may mess with me tho. Thanks for the advice.

[stangbat]

Re: My new SDX15 is thumpin away. *Pics*

I agree with blktre and wouldn't move his towers. The Zs need some room to sum properly and his soundstage is great. Mine are a closer together than his and my soundstage isn't as impressive. Not much I can do about it though.

I'm looking forward to getting this dialed in and hearing the end result. I was amazed at the setup using your old sub. I can't imagine it now.

blktre of course has more time in with the amp, my observations are only based on messing with it for a few hours, and I'm not trying to step on his toes or take over his thread with my comments. But the fan is noisy. Be ready to either put a new fan in it or work on the one in it to quiet it down. Ground loops are always a potential problem, but they didn't show up with blktre's setup until he added the amp, probably due to the amp having a ground as compared to the consumer stuff being double insulated and not having a separate ground. Just guessing though as I haven't investigated this further.

[blktre]

Re: My new SDX15 is thumpin away. *Pics*

Erik,
I don't know. Your soundstage (imaging) is pretty nice. I think the only difference is that your room continues well past the LC where i have an 8ft wall to the RC. I think that would be the only difference.

Yes as we all know, the amp has a noisy fan. My wife asked what that noise was. So, she noticed it right off the bat. But when music, movie, TV is playing, I don't notice it much. I do plan on researching the fan mod for it. The thing cools very nice, so nice that the case is cool to the touch. I would just want to make sure the fan mod will keep it just as cool.

[Brian Steele]

Re: My new SDX15 is thumpin away. *Pics*

Just finished up my new 4.4cf sealed SDX15 sub.

Damn, that's gorgeous. Nice work!

Do you have a page up describing your choices, its construction, etc?

I would like to link to it from my diysubwoofers site, if you don't mind.

[blktre]

Re: My new SDX15 is thumpin away. *Pics*

Damn, that's gorgeous. Nice work!

Do you have a page up describing your choices, its construction, etc?

I would like to link to it from my diysubwoofers site, if you don't mind.

Thanks Brian. It still needs finished. No, i don't have a dedicated build page. But i do have build pics and graphs. Not sure if that would help you?