bluesboy Posted November 2, 2011 Share Posted November 2, 2011 Heres one for all you speaker builders out there. When building a bass reflex enclosure assuming you have the internal volume of the enclosure correct and the ports sized correctly; how important is the actual shape of the cabinet? Quote Link to comment Share on other sites More sharing options...
mustang guy Posted November 2, 2011 Share Posted November 2, 2011 That is an excellent question. I would love to know that too. Quote Link to comment Share on other sites More sharing options...
Tobi Posted November 2, 2011 Share Posted November 2, 2011 That is an excellent question. I would love to know that too. Same here since I am already changing the footprint of my new build. Quote Link to comment Share on other sites More sharing options...
Guest David H Posted November 3, 2011 Share Posted November 3, 2011 The volume and port size are obviously the primary factors when building a box. Other factors such as dampening, bracing,and shape are also important, however take a back seat to the basics. Some things to consider: The box depth must be at least the port length + the port diameter. Stay away from perfect cubes when determining speaker dimensions. The width, height and depth should not be the same value. It should be OK if 2 of the numbers are near the same value. Account for the size of the internal bracing and speaker driver displacement when determining the size of each chamber. Account for the size of the crossover when determining the size of each chamber. Since this speaker has an unused chamber at the bottom the crossover will go there. This allows for changing/repairing the crossover without taking the speaker apart. http://www.diyaudioandvideo.com/FAQ/Build/ Dave Quote Link to comment Share on other sites More sharing options...
Guest " " Posted November 3, 2011 Share Posted November 3, 2011 on the port location....tucked directly into the corner is not as good as allowing room around the tube just as you would allow room at the end of the tube. as far as shape goes....while unrelated to port calculations...using non parallel walls has a cleaner sound...for example....Hersey slant monitor industrials s are 5 sided while Hersey industrials are standard rectangle boxes. They have the same componets, but sound different...even if both where positioned standing and directly facing you. Other shapes that work well are quasi pyrimind shaped towers. Quote Link to comment Share on other sites More sharing options...
mustang guy Posted November 3, 2011 Share Posted November 3, 2011 Actually something occurred to me. In car audio, subs are formed into all sorts of interesting shapes to fill the voids. So long as they follow the basic rules of subwoofer building, they usually sound good. Of course, a lot of that is due to the 12db cabin gain. Quote Link to comment Share on other sites More sharing options...
bluesboy Posted November 5, 2011 Author Share Posted November 5, 2011 Thanks Dave for the info and the link. What do you think about using Sonic Barrier 1/2 dampening foam on the inside of the enclosure? Quote Link to comment Share on other sites More sharing options...
Guest David H Posted November 6, 2011 Share Posted November 6, 2011 My opinion is the sonic barrier is fine, but overpriced. I use Polyfil batting, available at craft stores and walmart. Dave. Quote Link to comment Share on other sites More sharing options...
pzannucci Posted November 14, 2011 Share Posted November 14, 2011 Don't forget a thing called baffle step compensation. This is one reason why many speakers that are narrow have multiple woofers and roll out the lower woofer as frequency increases. This makes up for the lack of bass launch off the front of the speaker. The wider the speaker, the lower the frequency the compensation needs to be added for. This will allow your speakers to image better because they don't need to use the walls of the room for bass support (room loading). Quote Link to comment Share on other sites More sharing options...
bluesboy Posted November 14, 2011 Author Share Posted November 14, 2011 Don't forget a thing called baffle step compensation. This is one reason why many speakers that are narrow have multiple woofers and roll out the lower woofer as frequency increases. This makes up for the lack of bass launch off the front of the speaker. The wider the speaker, the lower the frequency the compensation needs to be added for. This will allow your speakers to image better because they don't need to use the walls of the room for bass support (room loading). How would baffle step compensation affect the enclosure design for a 604 Great Planes Audio driver? Quote Link to comment Share on other sites More sharing options...
pzannucci Posted November 15, 2011 Share Posted November 15, 2011 Don't forget a thing called baffle step compensation. This is one reason why many speakers that are narrow have multiple woofers and roll out the lower woofer as frequency increases. This makes up for the lack of bass launch off the front of the speaker. The wider the speaker, the lower the frequency the compensation needs to be added for. This will allow your speakers to image better because they don't need to use the walls of the room for bass support (room loading). How would baffle step compensation affect the enclosure design for a 604 Great Planes Audio driver? If you read http://sound.westhost.com/bafflestep.htm and some of the forum info at http://www.diyaudio.com/forums/multi-way/56769-when-use-baffle-step-compensation.html They explains it in further detail. Depending on the design, the box baffle (due to size) can support better bass or you need to compensate with the crossover to get more realistic bass. Basically as the box width (launch area) goes up, the lower the frequency that is capable of being forced into the room vs. wrapped around the speaker. Quote Link to comment Share on other sites More sharing options...
GregReese Posted November 15, 2011 Share Posted November 15, 2011 Making the walls as non-parrelel as you can is best. Also complicates construction. You want to avoid standing waves internally especially with a tall cabinet. I've built a lot of speakers from scratch ....some of which are here http://gallery.audioreview.com/showgallery.php?cat=500&ppuser=246853 As you can see I hate building square cabinets. Quote Link to comment Share on other sites More sharing options...
bluesboy Posted November 15, 2011 Author Share Posted November 15, 2011 Thanks Dave for the info and link. You do some pretty work. Quote Link to comment Share on other sites More sharing options...
THEACE51 Posted October 27, 2023 Share Posted October 27, 2023 Prolly not the right place for this question, so dont beat me up. Do you still have any blueprints, info, tips for building la scalas i have been contemplating building a pair. Thanks in advance for any and all help. Quote Link to comment Share on other sites More sharing options...
OO1 Posted October 27, 2023 Share Posted October 27, 2023 3 hours ago, THEACE51 said: Prolly not the right place for this question, so dont beat me up. Do you still have any blueprints, info, tips for building la scalas i have been contemplating building a pair. Thanks in advance for any and all help. you can buy a genuine used pair of Lascala quite inexpensively , go to the GARAGE SALE , and Alerts , deals come up on a regular basis 1 Quote Link to comment Share on other sites More sharing options...
Ceptorman Posted October 27, 2023 Share Posted October 27, 2023 7 hours ago, THEACE51 said: Prolly not the right place for this question, so dont beat me up. Do you still have any blueprints, info, tips for building la scalas i have been contemplating building a pair. Thanks in advance for any and all help. You're replying to a 12 year old thread, so the OP might not respond. Quote Link to comment Share on other sites More sharing options...
Marvel Posted October 27, 2023 Share Posted October 27, 2023 But you can still get answers... LaScala11.pdf Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.