21" Maelstrom Curved Box Build - Page 25 - AVS Forum | Home Theater Discussions And Reviews
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post #721 of 738 Old 04-16-2013, 03:56 PM
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"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.

Listen. It's All Good.
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post #722 of 738 Old 04-16-2013, 04:25 PM
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24db's of boost. Holy crap. eek.gif

GEEZ. i thought my 14DB was a lot!
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post #723 of 738 Old 04-16-2013, 05:07 PM
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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"
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post #724 of 738 Old 04-17-2013, 02:42 PM
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possibly the low bass may be MIA if there's no EQ
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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"

Noah
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post #725 of 738 Old 04-17-2013, 08:20 PM - Thread Starter
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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.
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post #726 of 738 Old 04-18-2013, 01:44 PM
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Are you sure it's not the amp clipping?

Noah
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post #727 of 738 Old 04-18-2013, 02:35 PM
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Quote:
Originally Posted by noah katz View Post

Are you sure it's not the amp clipping?
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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.
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post #728 of 738 Old 04-18-2013, 05:09 PM - Thread Starter
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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.
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post #729 of 738 Old 04-18-2013, 07:09 PM
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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.

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post #730 of 738 Old 11-07-2013, 06:29 PM
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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?
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post #731 of 738 Old 11-07-2013, 09:37 PM
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not sure if this is something that you are looking for:

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

Listen. It's All Good.
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post #732 of 738 Old 11-09-2013, 03:16 PM
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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.
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post #733 of 738 Old 08-19-2014, 06:48 AM
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Awesome build, and great skills.
Did you have any problems with cracking of the walls? Others have experienced problems with translam-builds:

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post #734 of 738 Old 08-19-2014, 07:12 AM
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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.
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post #735 of 738 Old 09-12-2014, 10:11 AM
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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.
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post #736 of 738 Old 07-22-2015, 03:20 PM
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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.
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post #737 of 738 Old 07-23-2015, 08:13 PM - Thread Starter
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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.
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post #738 of 738 Old Today, 03:10 PM
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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.
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