21" Maelstrom Curved Box Build - Page 25 - AVS Forum | Home Theater Discussions And Reviews
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DIY Speakers and Subs > 21" Maelstrom Curved Box Build
LTD02's Avatar LTD02 03:56 PM 04-16-2013
"Ricci measured..."

those are 2 meter measurements, so add 6db if comparing to winisd which is 1 meter model. then add 6db for two subs and power.

brian6751's Avatar brian6751 04:25 PM 04-16-2013
Quote:
Originally Posted by bass addict View Post

24db's of boost. Holy crap. eek.gif

GEEZ. i thought my 14DB was a lot!
MoFinWiley's Avatar MoFinWiley 05:07 PM 04-16-2013
Quote:
Originally Posted by LTD02 View Post

"Ricci measured..."

those are 2 meter measurements, so add 6db if comparing to winisd which is 1 meter model. then add 6db for two subs and power.

Yeah, it works out to a little over a 1db more for the 21 vs two SVS13's....which seems like a wash, which certainly doesn't seem like the SVS should be doing a "much better job"
noah katz's Avatar noah katz 02:42 PM 04-17-2013
possibly the low bass may be MIA if there's no EQ
Quote:
Originally Posted by MoFinWiley View Post

Yeah, it works out to a little over a 1db more for the 21 vs two SVS13's....which seems like a wash, which certainly doesn't seem like the SVS should be doing a "much better job"

corock's Avatar corock 08:20 PM 04-17-2013
Quote:
Originally Posted by MoFinWiley View Post

Lets me start with...This thread got me back into audio...

But, I have to say that I'm surprised it doesn't dig deep enough for HT? I'd love to see measurements

Let me also say that I now have two of these drivers, and they dig pretty deep. I am only running ~300 watts to each driver, but my enclosures are about 15 cu. ft. each.

The EQ'd measurements are post 619 on page 21.
http://www.avsforum.com/t/1238601/21-maelstrom-curved-box-build/600

It is reaching lower than I thought. I just know that some points in a movie will cause the sub to make terrible sounds. It could be because I have no filter for the really low signals. 7 cubic ft is a small enclosure for this driver. I don't worry about it because i built it for music. As well, I also built it as a piece of art and have it sitting in my living room instead of hidden in the dark home theatre.
noah katz's Avatar noah katz 01:44 PM 04-18-2013
Quote:
Originally Posted by corock View Post


Are you sure it's not the amp clipping?
BassThatHz's Avatar BassThatHz 02:35 PM 04-18-2013
Quote:
Originally Posted by noah katz View Post

Are you sure it's not the amp clipping?
Quote:
Originally Posted by corock View Post

The roll off at 15hz is not by design, but I would assume it's due to the small sealed enclosure. 7 cubic feet is as small a box as this driver can be realistically be packed in. I wouldn't be able to eq it flat to 10 hz, it would demand way too much of the amp, which is an ep4000. Not to mention rew only eq's down to 20hz. I'm not concerned about going lower any way. I built this sub to be dedicated to music. I'm building a basement home theater this winter and my dual PB13's will handle the movie duties.

It's making terrible sounds because that amp is way-insufficient, even bridged.
However 1 ch of an FP14k would be more-than sufficient, but no less.

I used to run my 21's on EP4k's, and then I switched them to clones. I'd never go back. Difference is night and day.

If I recall correctly it took about 9db more gain below 20hz to get the same response as my LMS 18's does in the same sized box.
corock's Avatar corock 05:09 PM 04-18-2013
I hadn't even considered that the sub might be under powered by the EP4k. It would make sense that the gain in the lower regions could cause it to clip. I might have to investigate this FP14k you speak of; I haven't even looked at alternatives before.
BassThatHz's Avatar BassThatHz 07:09 PM 04-18-2013
Here's the first excursion vid I've made of my 21's powered by a clone, at half-power.
At full power, it would rip this driver apart. As you can see.


Lonely Raven's Avatar Lonely Raven 06:29 PM 11-07-2013
I still have my 21" Maelstrom, and I'm looking for a second one (or that new IS 24") to add some pressure to the room.

Where does one purchase a clone from? Are there any other, more reliable, but still inexpensive options out there?
LTD02's Avatar LTD02 09:37 PM 11-07-2013
not sure if this is something that you are looking for:

http://www.istonline.ca/mach5_ftw_21.html
Lonely Raven's Avatar Lonely Raven 03:16 PM 11-09-2013
Quote:
Originally Posted by LTD02 View Post

not sure if this is something that you are looking for:

http://www.istonline.ca/mach5_ftw_21.html

Sorry, I was tired and should elucidated.

I was talking about that 14000 amp. I've heard of the clone amps, but I've never seen one for sale anywhere.
PHN2's Avatar PHN2 06:48 AM 08-19-2014
Awesome build, and great skills.
Did you have any problems with cracking of the walls? Others have experienced problems with translam-builds:


Lonely Raven's Avatar Lonely Raven 07:12 AM 08-19-2014
Wow, I wonder where all that tension is coming from that caused that to tear the plywood!

I know from experience, that if you clamp projects improperly, they will hold, but they are constantly under tension.

When I was 20 I made a chess board out of maple and walnut. I cut all these little scraps and glued them together - it was really beautiful. The cuts were slightly off here and there, and I corrected it by squeezing them into place with the clamps. It made sense at the time, but one really hot day I had the chess board in the back seat of my car, and had to slam on the brakes because someone cut me off; the board slid off the back seat and hit the floor of the car, then broke with a sound like a gunshot splitting up one of the glue lines (the wood cracked, not the glue).

That's my guess as to what's happening here.
PHN2's Avatar PHN2 10:11 AM 09-12-2014
That particular project used steelrods going through the sides. People on the other thread thought those were the cause of the cracks, since the rods would not ajust to the wood, when moving under temperature and moisture shifts.
edwardccm's Avatar edwardccm 03:20 PM 07-22-2015
Sorry to be rehashing this thread but do you still happen to have the plans or template for Sketchup that you originally used. I will be attempting to do a simmilar build with a 15 inch driver and it would be great of great help if you had your originals still.
corock's Avatar corock 08:13 PM 07-23-2015
Quote:
Originally Posted by edwardccm View Post
Sorry to be rehashing this thread but do you still happen to have the plans or template for Sketchup that you originally used. I will be attempting to do a simmilar build with a 15 inch driver and it would be great of great help if you had your originals still.
No I don't have any of the plans. There wasn't anything significant about them that couldn't be recreated. I just used Sketchup to come up with the design as a visual reference so that I could wrap my head around how to create it. And then I used it to create a picture for the curve so that I could print it off and use that to draw the curve onto the wood. Cutting each piece of plywood a different size to create the cylinder was just a little math. If you need any assistance on how to go about that feel free to send me a message anytime. I've helped a couple of guys out. I don't know if anyone actually built another one though.
LitoGeorge's Avatar LitoGeorge 03:10 PM 07-26-2015
Corock, I thought I have to complement you on your final outcome. Your rendering of the faceplate + granite top was simply sublime.

I do hope you get your faceplate, it is the finishing touch, the cherry on top. Screw that prick in Edmonton.
Iron Maiden's Avatar Iron Maiden 02:17 PM 10-17-2015
No question my favorite build simply because of the amount of work involved. The amount of hand work and love that went into it is a thing of beauty.
I want to find that Azzhole who took your faceplate and beat the living chit out of him for not allowing you to realize your final vision of this sub. I'm sure you explained to him what it was for and what had went into it. Makes me sick to think someone could just disregard that and never respond to you. He could have at least returned it. I'm not ashamed to say I hope he died and that was the reason you never heard back from him!!!
What an awesome build! Thanks for wasting an entire morning/afternoon reading through ths entire thread!!!! LOL I couldn't stop reading it!!!
I'm gonna ask a question on the other thread you have on this sub. A bit more appropriate on that thread than this one.
16hz lover's Avatar 16hz lover 08:43 AM 10-27-2015
It took me only 2 songs to blow up one of those subs. Felt bad about going to someones house and cooking their woofer, but it simply had its limits.
Iron Maiden's Avatar Iron Maiden 12:01 PM 10-27-2015
Quote:
Originally Posted by 16hz lover View Post
It took me only 2 songs to blow up one of those subs. Felt bad about going to someones house and cooking their woofer, but it simply had its limits.
The Mal 21 or the FTW?
Pretty generic statement when we have no clue what kind of enclosure it was in. What amp was pushing it. What kind of DSP was applied.
Could have 100% been user error and the reason it blew. Any sub will blow if not uses properly. There are guys on this forum using full power from Fp14K's to them with no problems.
16hz lover's Avatar 16hz lover 08:55 PM 10-27-2015
Quote:
Originally Posted by Iron Maiden View Post
The Mal 21 or the FTW?
Pretty generic statement when we have no clue what kind of enclosure it was in. What amp was pushing it. What kind of DSP was applied.
Could have 100% been user error and the reason it blew. Any sub will blow if not uses properly. There are guys on this forum using full power from Fp14K's to them with no problems.
Mal 21. not user error, this was back when they had serious build quality issues and had lots of failures with the spiders
Iron Maiden's Avatar Iron Maiden 11:02 AM 10-28-2015
Thanks for clarifying which sub. Was it ported or sealed?
I'm about to get two of the FTW's so glad to hear it was the "other" 21's you were dogging. lol
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