B&C Double 15 BR
Printed From: Speakerplans.com
Category: Plans
Forum Name: New Projects Forum
Forum Description: Forum for new speakerplans projects, in memory of Tony Wilkes, 1953 - 2014
URL: https://forum.speakerplans.com/forum_posts.asp?TID=108731
Printed Date: 26 March 2026 at 5:53pm
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com
Topic: B&C Double 15 BR
Posted By: CarlNagy
Subject: B&C Double 15 BR
Date Posted: 04 October 2024 at 12:14pm
|
Hi all, I'm a full time professional sound engineer working on TV and live events. I work on some pretty large events but I also do some smaller shows, with my own small PA, for a few hundred people. I am quite knowledgable in general audio theory, and in system design and deployment for large venues, but not so much with cabinet designs so I'm looking for some help! I have 4 B&C 15TBX100 drivers and would like to build a pair of 2x15 reflex boxes. I would like to keep it simple as I'm not much of a wood worker haha. I've messed around in WinISD and keep coming up with designs that look suitable in terms of freq response, excursion, and port velocity, but they all seem to require very long ports. I've been told that if the port is a slot design utilising one of the boxes walls it can be shorter? Is there a formula for this? I guess I'm just looking for some guidance on designing a simple to build BR box for my drivers. I think I'd like to tune the box somewhere around 35-38Hz but I'm open to suggestions. Current system is Nexo PS15's and RS15's. I'd like the new subs to be useable on their own as well as in combination with the Nexo subs. I have a rack of Powersoft T-series amps to run it all. The subs will be on a T-904 in bridge mode so 2x 3600W @ 4 ohms :) Thanks in advance for any help! |
Replies:
Posted By: snowflake
Date Posted: 04 October 2024 at 1:15pm
|
never built it but this design looks like it has decent port size and should work with your driver https://eighteensound.it/media/W1siZiIsIjIwMTgvMTAvMjMvMTFfMzhfMDdfODc5XzE4U291bmRfZG91YmxlXzE1X1N1Yndvb2Zlcl9raXRfdjEucGRmIl1d" rel="nofollow - https://eighteensound.it/media/W1siZiIsIjIwMTgvMTAvMjMvMTFfMzhfMDdfODc5XzE4U291bmRfZG91YmxlXzE1X1N1Yndvb2Zlcl9raXRfdjEucGRmIl1d |
Posted By: FOO
Date Posted: 04 October 2024 at 4:04pm
|
http://1.bp.blogspot.com/-PavSZK8zzY4/UkQtjEOnb9I/AAAAAAAAAfk/xi_CffUPjH8/s1600/215.jpg%20" rel="nofollow - http://1.bp.blogspot.com/-PavSZK8zzY4/UkQtjEOnb9I/AAAAAAAAAfk/xi_CffUPjH8/s1600/215.jpg
|
Posted By: CarlNagy
Date Posted: 05 October 2024 at 12:12am
| Ok so the B&C 215 looks nice and simple, I think I could build that. Any advice on bracing? It looks like maybe I should add some? |
Posted By: ceharden
Date Posted: 07 October 2024 at 12:18am
|
Extra bracing within reason is never a bad thing. 25mm ply seems a bit excessive. I've built plenty of bass cabinets out of 15mm ply, just needs a bit more bracing.
|
Posted By: CarlNagy
Date Posted: 07 October 2024 at 12:40am
|
Thanks, yea I was wondering about the 25mm too! I'll go for 18mm plus some internal bracing. Also planning to recess the front baffle slightly so I can add a grill. I'm guessing its' not ideal to cover the ports with the grill? Thanks for all the answers so far! |
Posted By: FOO
Date Posted: 07 October 2024 at 10:50am
| No problem going with full face grills. |
Posted By: smitske96
Date Posted: 07 October 2024 at 3:46pm
Putting them to close to ports can cause problems with airflow. So it should be considered to some extend.
|
FOO wrote:Posted By: ceharden
Date Posted: 07 October 2024 at 7:03pm
| If you recess the baffle and the end of the ports so that the grill isn't completely covering the port, you shouldn't have an issue. |
Posted By: CarlNagy
Date Posted: 08 October 2024 at 1:15am
| Ok great, I'll probably just recess the baffle then so the ports remain uncovered, but the drivers still have protection. It's already a large box and if I recess the whole front including the ports it will get even larger still! |