...in need of enclosure advice regarding 15-inch woofer - Page 3 - Home Theater Forum and Systems - HomeTheaterShack.com

Reply
 
Thread Tools
post #21 of 30 Old 06-16-09, 02:50 PM Thread Starter
Tattz
 
Join Date: Jun 2009
Location: oakville canada
Posts: 31
Re: ...in need of enclosure advice regarding 15-inch woofer

ideally 2ft cubed is what i can be comfortable with, but i'll handle it if it's bigger. I have a 120w woofer amplifier handy for amplification.

Multi-use is always a good thing, but i'll sacrifice that as long as it does a good job in the studio. Just for the record, my studio is about 30 feet by 10 feet.
Tattz is offline  
Sponsored Links
Advertisement
 
post #22 of 30 Old 06-16-09, 03:02 PM
Elite Shackster
 
Ricci's Avatar
Josh
 
Join Date: May 2007
Location: Louisville, KY
Posts: 2,431
Re: ...in need of enclosure advice regarding 15-inch woofer

Ok. Since you have a large room and your power amp is conservative at 120w that makes me think that the LoRider 18 really is a good choice for you. It's efficient so it'll still get loud off of that 120w and it should have great SQ due to a light moving mass and very low inductance. I understand that it's right at the limit of what you wanted to spend on a driver but it's a solid piece that should last you for years.

A 2' cube is about 6cu ft of usable volume for the driver. I think with just increasing that a little bit you'll be in fine shape. I'll model something up later.
Ricci is offline  
post #23 of 30 Old 06-17-09, 12:22 AM
GPM
Senior Shackster
 
GPM's Avatar
GM
 
Join Date: Jan 2007
Location: Chamblee, Ga.
Posts: 264
Re: ...in need of enclosure advice regarding 15-inch woofer

Quote:
Tattz wrote: View Post
GPM, thanks for the help, much appreciated. I'll plug those parameters into Winisp and see what it gives me. also, i don't care how big the enclosure it has to be, i'll make space for it.
Greets!

You're welcome!

Hmm, my experience with this driver is that except either in a small room or possibly EQ'd ~flat in a corner, a typical BR or sealed alignment isn't going to do the 20s well as Ricci noted. TL is pretty much it IMO. Also, now that we know the room is 30 ft long, its 1st axial mode will be around 19 Hz, so no room gain of note to help the TL's sagging response in the 20s, making the LoRider in a 4th order band-pass (BP) a much more viable choice and it will be a bit smaller at only ~11 ft^3.

GM

Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
GPM is offline  
 
post #24 of 30 Old 06-17-09, 10:44 AM
Elite Shackster
 
Ricci's Avatar
Josh
 
Join Date: May 2007
Location: Louisville, KY
Posts: 2,431
Re: ...in need of enclosure advice regarding 15-inch woofer

With the Low Rider 18 a vented box of 10.0cu ft net volume tuned to 25hz with an 8" port 15.7" long looks pretty good. That'd be a box of about 24"x24"x39" external to end up with that volume after driver port and bracing displacement. It is about -6db down at 27hz and should do about 110db or more from 24hz on up in your room with 120w. You'd want to use a 20hz rumble filter with it. Later on down the road you can up the power to about 350 or 400w to add about 4db more headroom.
Ricci is offline  
post #25 of 30 Old 06-22-09, 06:25 PM Thread Starter
Tattz
 
Join Date: Jun 2009
Location: oakville canada
Posts: 31
Re: ...in need of enclosure advice regarding 15-inch woofer

hmm it looks like I'll have to do layering of the bass response in the studio for this album. I have no way of building this kind of system for now.

Rici, this configuration, will it be usable in small live venues, or is your suggestion purely for my room's configuration? I'm asking because, if I put this project off for next album's release, i want to know how dynamic this setup will be in different indoor settings.
Tattz is offline  
post #26 of 30 Old 06-22-09, 06:31 PM Thread Starter
Tattz
 
Join Date: Jun 2009
Location: oakville canada
Posts: 31
Re: ...in need of enclosure advice regarding 15-inch woofer

oh also, what can you guys tell me about dampening material and would this help my project at all? If so, how?
Tattz is offline  
post #27 of 30 Old 06-23-09, 09:27 PM Thread Starter
Tattz
 
Join Date: Jun 2009
Location: oakville canada
Posts: 31
Re: ...in need of enclosure advice regarding 15-inch woofer

hey guys, look what i stumbled upon. Opinions/reactions?

http://www.northcreekmusic.com/Thunder/ThunderInfo.htm
Tattz is offline  
post #28 of 30 Old 06-27-09, 02:57 PM
GPM
Senior Shackster
 
GPM's Avatar
GM
 
Join Date: Jan 2007
Location: Chamblee, Ga.
Posts: 264
Re: ...in need of enclosure advice regarding 15-inch woofer

Apparently, Ricci has moved on......... You'd have to define 'small' since with Ricci's alignment's ~800 W limit (if kept within Xmax) it would be plenty enough back when I helped folks with their portable sound systems, but on a live audio thread recently I got told in no uncertain terms that if a speaker couldn't do >130 dB/m from 40 Hz-up it wasn't a contender, which this alignment won't do unless you use four with several kW on tap.

Cabs this big require at least one each of all parallel surfaces covered to damp down its eigenmodes (standing waves), so typically one side, top and back of a vented cab gets covered with 1" acoustic fiberglass insulation or similar 'faceless' insulation.

WRT the 'Thunder', being a PR vented sub it's tuned too high IMO. These are best suited for <20 Hz tunings where the vent would be unacceptably long for a low vent mach. Best also to use two drivers/PRs in a bipolar layout to ~cancel out their vibrations as pioneered AFAIK by the Servo-Drive Contrabass special effects sub used in theme park, etc., sound systems.

GM

Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
GPM is offline  
post #29 of 30 Old 06-29-09, 11:14 AM
Elite Shackster
 
Ricci's Avatar
Josh
 
Join Date: May 2007
Location: Louisville, KY
Posts: 2,431
Re: ...in need of enclosure advice regarding 15-inch woofer

It kind of depends like GM said, whether it would be enough for live sound. Used sensibly in smaller places and possibly adding another cab to make it a pair down the road, it could be decent enough. Many of the live sound guys poo-poo anything that won't do 135db peaks easily, but those guys are usually doing very large scale productions with professional rigs. It'd be plenty for live bass guitar and like I said a pair would be ok for bar band/weekend warrior SR work.
Ricci is offline  
post #30 of 30 Old 06-29-09, 03:41 PM Thread Starter
Tattz
 
Join Date: Jun 2009
Location: oakville canada
Posts: 31
Re: ...in need of enclosure advice regarding 15-inch woofer

certainly, only this project is for a very small studio, not for live sound. My goal is really to be able to monitor music down to 24hz.
Tattz is offline  
Reply

Bookmarks

Tags
...in , 15-inch , advice , enclosure , woofer

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