21" Maelstrom Curved Box Build - Page 25 - AVS | Home Theater Discussions And Reviews
Baselworld is only a few weeks away. Getting the latest news is easy, Click Here for info on how to join the Watchuseek.com newsletter list. Follow our team for updates featuring event coverage, new product unveilings, watch industry news & more!


Forum Jump: 
 
Thread Tools
Old 04-16-2013, 03:56 PM
AVS Addicted Member
 
LTD02's Avatar
 
Join Date: Oct 2003
Posts: 17,894
Mentioned: 59 Post(s)
Tagged: 0 Thread(s)
Quoted: 1073 Post(s)
Liked: 1475
"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.
LTD02 is online now  
Sponsored Links
Advertisement
 
Old 04-16-2013, 04:25 PM
AVS Special Member
 
brian6751's Avatar
 
Join Date: Mar 2006
Location: Canton, MI
Posts: 3,453
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 84 Post(s)
Liked: 130
Quote:
Originally Posted by bass addict View Post

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

GEEZ. i thought my 14DB was a lot!
brian6751 is offline  
Old 04-16-2013, 05:07 PM
Member
 
MoFinWiley's Avatar
 
Join Date: Feb 2011
Location: Dual Coastin'
Posts: 179
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 12
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"
MoFinWiley is offline  
Old 04-17-2013, 02:42 PM
AVS Addicted Member
 
noah katz's Avatar
 
Join Date: Apr 1999
Location: Mountain View, CA USA
Posts: 20,961
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 525 Post(s)
Liked: 212
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"

Noah
noah katz is online now  
Old 04-17-2013, 08:20 PM - Thread Starter
Senior Member
 
corock's Avatar
 
Join Date: Oct 2007
Posts: 273
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
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.
corock is offline  
Old 04-18-2013, 01:44 PM
AVS Addicted Member
 
noah katz's Avatar
 
Join Date: Apr 1999
Location: Mountain View, CA USA
Posts: 20,961
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 525 Post(s)
Liked: 212
Quote:
Originally Posted by corock View Post


Are you sure it's not the amp clipping?

Noah
noah katz is online now  
Old 04-18-2013, 02:35 PM
AVS Special Member
 
BassThatHz's Avatar
 
Join Date: Apr 2008
Location: Northern Okan range (NW Cascades region)
Posts: 4,189
Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 756 Post(s)
Liked: 650
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.
BassThatHz is offline  
Old 04-18-2013, 05:09 PM - Thread Starter
Senior Member
 
corock's Avatar
 
Join Date: Oct 2007
Posts: 273
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
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.
corock is offline  
Old 04-18-2013, 07:09 PM
AVS Special Member
 
BassThatHz's Avatar
 
Join Date: Apr 2008
Location: Northern Okan range (NW Cascades region)
Posts: 4,189
Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 756 Post(s)
Liked: 650
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.

BassThatHz is offline  
Old 11-07-2013, 06:29 PM
Senior Member
 
Lonely Raven's Avatar
 
Join Date: Jul 2008
Location: Bolingbrook, IL
Posts: 442
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
Liked: 23
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?
Lonely Raven is offline  
Old 11-07-2013, 09:37 PM
AVS Addicted Member
 
LTD02's Avatar
 
Join Date: Oct 2003
Posts: 17,894
Mentioned: 59 Post(s)
Tagged: 0 Thread(s)
Quoted: 1073 Post(s)
Liked: 1475
not sure if this is something that you are looking for:

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

Listen. It's All Good.
LTD02 is online now  
Old 11-09-2013, 03:16 PM
Senior Member
 
Lonely Raven's Avatar
 
Join Date: Jul 2008
Location: Bolingbrook, IL
Posts: 442
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
Liked: 23
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.
Lonely Raven is offline  
Old 08-19-2014, 06:48 AM
Newbie
 
PHN2's Avatar
 
Join Date: Apr 2005
Posts: 8
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Awesome build, and great skills.
Did you have any problems with cracking of the walls? Others have experienced problems with translam-builds:

PHN2 is offline  
Old 08-19-2014, 07:12 AM
Senior Member
 
Lonely Raven's Avatar
 
Join Date: Jul 2008
Location: Bolingbrook, IL
Posts: 442
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
Liked: 23
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.
Lonely Raven is offline  
Old 09-12-2014, 10:11 AM
Newbie
 
PHN2's Avatar
 
Join Date: Apr 2005
Posts: 8
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
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.
PHN2 is offline  
Sponsored Links
Advertisement
 
 
Thread Tools


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off