scanspeak woofer

[Helmer]

I am considering designing a speaker system using the scanspeak 26W/8867t 10" woofer. I have noticed that the Z plot fs point differs from their printed specs. Has anyone done any designs with this woofer or any other scanspeak woofers and have you found the printed specs to be sufficient for design work?

Hal Johnson

[JonMarsh]

I've used that woofer and the 12 ohm version, and generally I've found the actual specs to be off in a manner suggesting that the magnet's aren't energized quite as powerfully in production devices as prototypes. I.E., Qe is lower, BL is lower, efficiency slightly lower, and Qtc somewhat higher. This is hardly out of the ordinary, and I always use my own measured data for design development, including cabinet alignment and of course, detailed crossover design.