Do recones need a break-in period?

**bfish** · March 28th, 2010, 05:59 PM

Here's what Klippel (the guys that make the test sytems mfrs & engineers use...) has to say;

http://www.klippel.de/download/bin%5...easurement.pdf

The meat is in the last 2-3 pages (complete w/graphs & charts). Note the reference to non-linearities due to compliance changes... when "broken in", the suspension actually becomes stiffer at travel extremes, but more compliant at lower excursions.

But it's just a brief change... at times on the order of seconds. Therefore, it's not a permanent thing like we normally think of as "break-in". I like to think of it more as "warming up".

Added;
For those that never push their woofs anywhere near Xmax, it's a non-issue.

**Nipper** · March 28th, 2010, 06:43 PM

Originally Posted by bfish

Added;
For those that never push their woofs anywhere near Xmax, it's a non-issue.

Ahhhhh..... So we only needed to break in our woofers!

**bfish** · March 28th, 2010, 07:13 PM

Originally Posted by Nipper

Ahhhhh..... So we only needed to break in our woofers!

Well, the topic is "Do recones need a break-in period". What else get's reconed?

To be fair, anything with a typical spider.

But...

I'm not saying anyone should breakin their woofers for listening purposes, only for measurement and design. Actually, since a suspension that has loosened up is generally less linear than one that hasn't, why would anyone do it at all...

**Nipper** · March 28th, 2010, 10:44 PM

Originally Posted by bfish

Well, the topic is "Do recones need a break-in period". What else get's reconed?

Dont tell anyone but I had a set of Infinity speakers once and they had a designated midrange speaker.

Please dont take me to serious on this topic Bfish.... Just having fun.

**Earl K** · April 18th, 2010, 08:44 AM

Originally Posted by RonSSS,RonSS

When I got my reconed 411-8A's back from GPA, I measured the TS parameters. They were not close to what Altec spec'd......so I set one on the bench and ran it with a 10 hz sinewave, about a 1/4" excursion for 2 days.
Re-measured...no difference.
I think driver break-in is bs. Sorry.

Ron, I'm curious about what Bill is providing as a 411 recone substitute .

I realize your 411(s) were the first pair that Bill did ( now a few years ago ) .

Did you by chance keep a record of their TS parameters ( as measured back then ) ?

Specifically, I'm wondering if you measured BL, MMS and/or ( attempted to get an accurate ) VAS ?

thanks <> EarlK