Riser Builds - Ultimax 15s - LF Advice/Calculations - Home Theater Forum and Systems - HomeTheaterShack.com

 
Thread Tools
post #1 of 6 Old 09-12-16, 09:31 PM Thread Starter
Shackster
 
Join Date: Jun 2016
Posts: 14
Riser Builds - Ultimax 15s - LF Advice/Calculations

Hello,

I am fairly new to the home theater scene - see thread here: http://www.hometheatershack.com/foru...ce-driver.html - but intend on going "all out"!!

A quick run down of my current set-up:

Yamaha A3060 Receiver
2x Crown XLS 1502 Amplifiers powering one subwoofer each
2x Stereo Integrity DS4-18" subwoofers in custom 4.5 cubic foot sealed boxes (waiting for aluminum feet to be made)
Axiom M80 Towers
Axiom VP180 Center
Axiom QS8 Surrounds
Sony VPL-HW45ES Projector
Silver Ticket 100" 16:9 Screen

I will be adding a riser for my rear seats and will be turning them into two separate subwoofer boxes.

From the research I have done, I have settled on using one Dayton Audio Ultimax 15" subwoofer in each riser box, ported. http://www.daytonaudio.com/index.php...-per-coil.html

The riser will be approximately 10" total height and I am estimating a 'naked' internal volume of approximately 14.5 cubic feet PER box.

My question is this, how large (length and diameter) of ports should I use for each box? I am (obviously) going for low frequencies with this set-up. I believe I should be hitting around 15hz but am not positive on that nor about how to design the ports, all help is appreciated!

We have leftover hardwood flooring from the renovations completed upstairs and will be placing that on the surface of the riser, and there will be matte black sides all the way around (the sides will be 3/4" higher than the box so as to accommodate the 3/4" hardwood planks to ensure they are secure and flush - glued down), I will be sure to upload more photos once everything is complete.

Thanks in advance for your help, I have attached some photos of my current set-up as well as a rough excel-sketch of the proposed riser!
Attached Thumbnails
Riser Builds - Ultimax 15s - LF Advice/Calculations-img_20160901_163800.jpg  

Riser Builds - Ultimax 15s - LF Advice/Calculations-img_20160907_232543.jpg  

Riser Builds - Ultimax 15s - LF Advice/Calculations-theater-riser.jpg  

Riser Builds - Ultimax 15s - LF Advice/Calculations-img_20160831_200728.jpg  

Attached Files Theater riser.pdf (31.6 KB) 

Last edited by Keongman; 09-12-16 at 09:44 PM.
Keongman is offline  
Sponsored Links
Advertisement
 
post #2 of 6 Old 09-13-16, 10:50 AM
Elite Shackster
Quenten
 
Join Date: Jun 2007
Location: Tallahassee, Florida
Posts: 2,453
My System
Re: Riser Builds - Ultimax 15s - LF Advice/Calculations

Well if I were going to use my riser as a box, I think I would use it in a horn design. Would give you a much better response!
Tonto is offline  
post #3 of 6 Old 09-13-16, 09:36 PM
HTS Senior Moderator
 
fusseli's Avatar
Russ
 
Join Date: May 2007
Location: The Inland NW, USA
Posts: 1,852
My System
Re: Riser Builds - Ultimax 15s - LF Advice/Calculations

Looks very promising. Can you post WinISD files of the design? It's hard to say how big your port needs to be without modeling it, in general terms it will need to be very large (3 or 4 inch round ports will NOT do) considering a box that big and the low tune and the capable driver.


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.

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.
fusseli is offline  
 
post #4 of 6 Old 09-13-16, 09:36 PM
HTS Senior Moderator
 
fusseli's Avatar
Russ
 
Join Date: May 2007
Location: The Inland NW, USA
Posts: 1,852
My System
Re: Riser Builds - Ultimax 15s - LF Advice/Calculations

Beautiful HT room by the way!


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.

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.
fusseli is offline  
post #5 of 6 Old 09-14-16, 09:37 PM Thread Starter
Shackster
 
Join Date: Jun 2016
Posts: 14
Re: Riser Builds - Ultimax 15s - LF Advice/Calculations

Quote:
Tonto wrote: View Post
Well if I were going to use my riser as a box, I think I would use it in a horn design. Would give you a much better response!
Good suggestion, however I have discussed with a friend and apparently that would be way beyond my needs, apparently also increasing the volume significantly. To be honest, I already find my existing subs to be frightening during certain scenes (barrel roll scene in Flight of the Phoenix for one). I am adding these subs as a "why not" since I will be making a riser regardless.

They will definitely be way way beyond my expectations/needs as standard ported design

Quote:
fusseli wrote: View Post
Looks very promising. Can you post WinISD files of the design? It's hard to say how big your port needs to be without modeling it, in general terms it will need to be very large (3 or 4 inch round ports will NOT do) considering a box that big and the low tune and the capable driver.
I have never used WinISD, but I noticed there were instructions on this forum. I will download tonight/tomorrow and give it a try.

Quote:
fusseli wrote: View Post
Beautiful HT room by the way!
Thanks!
Keongman is offline  
post #6 of 6 Old 12-16-16, 10:52 AM
Senior Shackster
 
mtbdudex's Avatar
Mike R
 
Join Date: Jan 2008
Location: SE, Michigan
Posts: 128
Re: Riser Builds - Ultimax 15s - LF Advice/Calculations

Quote:
Keongman wrote: View Post
Good suggestion, however I have discussed with a friend and apparently that would be way beyond my needs, apparently also increasing the volume significantly. To be honest, I already find my existing subs to be frightening during certain scenes (barrel roll scene in Flight of the Phoenix for one). I am adding these subs as a "why not" since I will be making a riser regardless.

They will definitely be way way beyond my expectations/needs as standard ported design



I have never used WinISD, but I noticed there were instructions on this forum. I will download tonight/tomorrow and give it a try.



Thanks!
What did you end up doing here?
Post a picture of your riser/subwoofer.

Mike R,P.E.

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.
mtbdudex is offline  
Reply

Bookmarks

Tags
15s , advice or calculations , builds , lf , riser , ultimax

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









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



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