7.6 cu.ft Maelstrom- X 18" build - Page 4 - Home Theater Forum and Systems - HomeTheaterShack.com

Reply
 
Thread Tools
post #31 of 305 Old 08-24-09, 07:28 AM
Shackster
Jukka
 
Join Date: Mar 2008
Location: Finland
Posts: 65
Re: 7.6 cu.ft Maelstrom- X 18" build

Quote:
sub_junkie wrote: View Post
I can't wait until I get the EP2500. According to WinISD, I will pick up around 30db everywhere. Should be much better... Can't imagine it then
Erm, More like 9dB - 10dB when moved from 150W --> maximum of 1800W.
Jugix is offline  
Sponsored Links
Advertisement
 
post #32 of 305 Old 08-24-09, 09:56 AM
Senior Shackster
Mathias
 
Join Date: Sep 2007
Location: Seattle
Posts: 241
Re: 7.6 cu.ft Maelstrom- X 18" build

Quote:
Jugix wrote: View Post
Erm, More like 9dB - 10dB when moved from 150W --> maximum of 1800W.
Not to be a nitpick but the EP2500 delivers >2000W with extremely low distorsion in 4ohm bridged, more power than that and the distorsion picks up. Not noticable in the bass regions though, IMO.

fackamato is offline  
post #33 of 305 Old 08-24-09, 11:33 AM Thread Starter
Elite Shackster
 
sub_junkie's Avatar
Dylan
 
Join Date: Apr 2009
Location: Las Vegas, Nevada
Posts: 1,362
Re: 7.6 cu.ft Maelstrom- X 18" build

Quote:
Jugix wrote: View Post
Erm, More like 9dB - 10dB when moved from 150W --> maximum of 1800W.
You have to rememer that my 150w amp has a HPF set aroud 35hz and could possibly be third order instead or second order.
Also, according to my graphing, I will have to take back the 30db's more. It is more like 15-25 db's more in the EP2500 bridged mono mode. It's about 15db more at 40hz, almost 20db at 20hz, and 25db's more at 10hz. So it's close to what I said, but I just wanted to clarify that.

Last edited by sub_junkie; 08-24-09 at 03:21 PM.
sub_junkie is offline  
 
post #34 of 305 Old 08-25-09, 11:38 AM
Elite Shackster
 
Mike P.'s Avatar
Mike
 
Join Date: Apr 2007
Location: Chitek Lake, Sask.
Posts: 19,397
Re: 7.6 cu.ft Maelstrom- X 18" build

Dylan, although you don't have a proper amp yet, I'm just curious if you have tried blocking the port to see if you get the "tighter bass" that you're after.




We're all in this together!


To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

Mike P. is offline  
post #35 of 305 Old 08-25-09, 01:50 PM Thread Starter
Elite Shackster
 
sub_junkie's Avatar
Dylan
 
Join Date: Apr 2009
Location: Las Vegas, Nevada
Posts: 1,362
Re: 7.6 cu.ft Maelstrom- X 18" build

I have plugged the port with a beach towel (lol), and heard little difference on some songs.
I was, however, able to tell a bigger difference on songs with low bass around 10-30hz. It gave it a little tighter bass, but at the sacrifice of clipping the amp due to turning it up more .
I am making sure that I don't clip the amp, but it happens occasionally. I'm not interested in damaging my new sub at all.
My dad was saying that he thinks I should start off with a 500w amp first. The cheapest one I could find was the BASH 500w amp from PE. Just in case I can't get the EP2500, which 500w or so amp would you recommend?
sub_junkie is offline  
post #36 of 305 Old 08-25-09, 02:26 PM
Elite Shackster
 
Mike P.'s Avatar
Mike
 
Join Date: Apr 2007
Location: Chitek Lake, Sask.
Posts: 19,397
Re: 7.6 cu.ft Maelstrom- X 18" build

Green is the P.E. Bash amp with the default 30 hz HPF.

Pink is the P.E. Bash amp with the HPF changed to 13.9 hz.

Orange is the O-Audio Bash amp with the HPF set at 20 hz and the boost that comes with it.

7.6 cu.ft Maelstrom- X 18" build-dylan.jpg




We're all in this together!


To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

Mike P. is offline  
post #37 of 305 Old 08-25-09, 02:45 PM Thread Starter
Elite Shackster
 
sub_junkie's Avatar
Dylan
 
Join Date: Apr 2009
Location: Las Vegas, Nevada
Posts: 1,362
Re: 7.6 cu.ft Maelstrom- X 18" build

So it looks like the BASH is the way to go. I will hopefully still be able to get the EP2500 though. Hopefully soldering on the correct capacitor won't be too hard to do, but I'm pretty good with soldering
sub_junkie is offline  
post #38 of 305 Old 08-25-09, 02:55 PM Thread Starter
Elite Shackster
 
sub_junkie's Avatar
Dylan
 
Join Date: Apr 2009
Location: Las Vegas, Nevada
Posts: 1,362
Re: 7.6 cu.ft Maelstrom- X 18" build

I have something modeled a little different. Maybe you just had either the box size or the tuning off? Just wanted to make sure that I didn't do anything wrong.

Red is 500w with a HPF at 13.9hz
Silver is the 2000w with a HPF at 15hz.



Is mine basically the same, just I have different spread sheet for WinISD?
sub_junkie is offline  
post #39 of 305 Old 08-25-09, 03:53 PM
Elite Shackster
 
Mike P.'s Avatar
Mike
 
Join Date: Apr 2007
Location: Chitek Lake, Sask.
Posts: 19,397
Re: 7.6 cu.ft Maelstrom- X 18" build

The 13.9 hz HPF is also with 1 db of boost at 22 hz with a filter Q of 1.0. My SPL range is 70 -125. Your build thread says 7.6 - 7.8 cu.ft, I modeled with 7.7 cu.ft. with the port dimensions you stated which ended up being 14.66 hz.




We're all in this together!


To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

Mike P. is offline  
post #40 of 305 Old 08-25-09, 05:00 PM Thread Starter
Elite Shackster
 
sub_junkie's Avatar
Dylan
 
Join Date: Apr 2009
Location: Las Vegas, Nevada
Posts: 1,362
Re: 7.6 cu.ft Maelstrom- X 18" build

Oh, ok. I forgot to add the boost. Thanks for pointing that out. I had just estimated there that the port was tuned to 14.75hz on that post. I got lazy
I will try adding the boost and see what it comes out to. Thanks for the help again Mike. Hopefully I can still get the EP2500 though. Would I be able to boost the bottom end with the Reckhorn B-1? Or do I not need to? I probably don't need to, but I was just wondering.

Thanks for the help
sub_junkie is offline  
Reply

Bookmarks

Tags
18" , build , cu.ft , maelstrom-

Quick Reply
Message:
Options

Register Now




PLEASE COMPLETE ALL REQUIRED FIELDS BELOW... THANKS!

REQUIRED FIELDS ON THIS PAGE
YOU MUST COMPLETE ALL OF THESE

Username
Password
Confirm Password
Email Address
Confirm Email Address
Random Question
Random Question #2




User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
PLEASE READ BELOW PRIOR TO ENTERING AN EMAIL ADDRESS!

ATTENTION!

YOU MUST ACTIVATE YOUR ACCOUNT!

Activation requires you reply to an email we will send you after you register... if you do not reply to this email, you will not be able to view certain areas of the forum or certain images... nor will you be able download software.

AN INVALID EMAIL ADDRESS WILL CAUSE YOUR ACCOUNT TO BE DELETED!

See our banned email list here: Banned Email List

We DO NOT respond to spamcop, boxtrapper and spamblocker emails... please add @hometheatershack DOT com to your whitelist prior to registering or you will get nowhere on your registration.


Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may 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 is not allowed!
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


For the best viewing experience please update your browser to Google Chrome