Guest Bret Posted December 29, 2003 Report Share Posted December 29, 2003 Sean wrote: >Ken: The one thing that really surprised me about these measurements was the very high Bl that they demonstrated. Even the "worst" one was 14+, which is still quite high. Were you expecting figures like this from these drivers? I sure wasn't.<Sean,The reason I was willing to have a driver "destroyed" and some done here and some done there was really very simple: I wanted to know what repairs seemed to work and which didn't such that we all might know what to-do or not-do to revive our aging classics. Measurements have to be more useful than anecdotes.I believe I am gleaning the information I wanted and have already developed a prejudice. Realizing that wisdom requires expertise and hard-won intuitions, awaiting further pronouncements from Ken for finalizing an opinion seems prudent. However, your quoted remark is giving me pause. I have, until now, assumed that the numbers Ken is getting are really only useful in terms of the relative performance of the drivers tested and say little about the original engineering.No?What would a higher-than-expected Bl mean? That the design requires it? That it's too high? That Ken's tests may be a little "off?"BretP.S. - I appreciate your acknowledgment of my minor contribution. That "mad money" would have recently purchased a pair of 303a's. I'm sure the 303 opportunity will present itself again. Ken's willingness to do these tests might have disappeared. Link to comment Share on other sites More sharing options...
Guest Sean Posted January 3, 2004 Report Share Posted January 3, 2004 Brent: BL is the term used for "motor force" or what some loosely refer to as the "slam" or "impact factor" of a driver. The more efficient the motor is, the higher the BL. As such, this shows that AR was actually pretty well ahead of their time in driver / motor design as many "high tech" woofers are now only achieving this high of a BL. There are MANY, MANY subs on the market today that don't achieve this high of a figure. Even those of long throw design, massive foam surrounds and bumped & vented back plates with massive magnet / voice coil structures. For sake of reference, the highly respected NHT 1259 only has a factory BL rating of "9" if memory serves me right.Other than that, thanks again for what you've done. Hopefully, both the time and effort that you and Ken have put in will be recognized by others for what it is. Sean> Link to comment Share on other sites More sharing options...
Guest Bret Posted January 3, 2004 Report Share Posted January 3, 2004 >BL is the term used for "motor force" or what some loosely refer to as the "slam" or "impact factor" of a driver. <Thank you for that explanation. I have seen Ken's reply to you in the DATA thread and so will continue to follow along there - with great interest.Bret Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.