subwoofer bl spec
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=134345
Printed Date: May 14, 2024 at 8:48 PM
Topic: subwoofer bl spec
Posted By: soundnsecurity
Subject: subwoofer bl spec
Date Posted: June 10, 2013 at 7:21 PM
as far as i know the BL is the measure of the motors strength and ability to control the cone, but is it better for the number to be higher or lower? im leaning toward higher but im unsure so can someone please clarify?
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Replies:
Posted By: DYohn
Date Posted: June 11, 2013 at 10:44 AM
Higher Bl indicates a stronger motor structure, which generally translates to more accurate output and faster transient response - and generally better SQ. More critical than the actual Tesla-meters number is how flat Bl remains through the entire motor stroke: meaning do you have the same strength at Xmax as you do at the rest position. Most companies do not tell you that, however, but if they do it will be provided as a Bl/Bl curve. Flatter curve is better. ------------- Support the12volt.com
Posted By: soundnsecurity
Date Posted: June 11, 2013 at 10:55 AM
yea ive never seen them give the actual curve, what sparked my curiosity was that i just bought an old model RE XXX with XBL^2 design and was comparing the Bl to the new one which is a split coil design, old is 17.1 and new is 18.2, what threw me off completely was that the SX line has a Bl of 21. so knowing that the Bl was sort of an indicator of accurateness it just didnt make sense to me that a lower model sub had a much better Bl. but now that you mention the Bl curve it probably doesnt have a better curve than either XXX
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Posted By: DYohn
Date Posted: June 11, 2013 at 12:37 PM
XBL2 has the best Bl curve of any single-coil design, but a good split-coil design can match it. The high Bl of the SX is likely a peak measurement, at the rest position. This is great for transient response but as it falls off at the extremes, distortion goes way up. ------------- Support the12volt.com
Posted By: soundnsecurity
Date Posted: June 11, 2013 at 12:56 PM
a lot of complex audio wizardry going on i guess. i wish there was somewhere i could just go to take classes on all of the more technical aspects of audio.
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Posted By: DYohn
Date Posted: June 12, 2013 at 4:07 PM
soundnsecurity wrote:
a lot of complex audio wizardry going on i guess. i wish there was somewhere i could just go to take classes on all of the more technical aspects of audio.
Acoustics Engineering classes from a major university. :) ------------- Support the12volt.com
Posted By: soundnsecurity
Date Posted: June 13, 2013 at 12:03 AM
honestly i tried that already, i started college at university of new orleans with a major in electrical engineering, but it would have been two years before i even entered a class remotely related to electronics of any kind. do you know of any books i could read? text books included... im great at teaching myself, im not looking to be a genius just someone who likes to play with sound a little too much 
learned more from this site than i did in college
Posted By: DYohn
Date Posted: June 13, 2013 at 10:02 AM
Everest's and Murphy's books from this list are great: https://www.the12volt.com/links/books.asp
Also read Lynn Olsen's web pages here: https://www.nutshellhifi.com/library/speaker-design1.html There is also some good information on Audioholics, here: https://www.audioholics.com/education/loudspeaker-basics/loudspeaker-drivers
For hard-core principles of loudspeaker driver design, look for the text book "Audio Transducers" by Dr. Earl Geddes. Check on his web site www.gedlee.com You might also see if you can download the "AES Compendium on Loudspeakers" although it's probably out of print. ------------- Support the12volt.com
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