SpeakerTalk

[Lee in Montreal]

I have just finished redrawing the 107/2 cabinet, but am missing the bolt pattern for mounting the B250. Would anybody have them?
Can anyone confirm the bass port size at 4" / 102mm ?

Thanks in advance

Lee
_________________
Current line up
2 sets basic Kef 104/2
2 sets bi-wire Kef 104/2
Plenty of KEF components for a few fun builds

[Lee in Montreal]

Any place I can find the technical papers for the KEF B250 sp1215 ?
Same woofer used in the 107/2 and AV1 subwoofers

TIA

Lee
_________________
Current line up
2 sets basic Kef 104/2
2 sets bi-wire Kef 104/2
Plenty of KEF components for a few fun builds

[Lee in Montreal]

It seems that the only specs available are for drivers that Kef sold in the Construction Series.

http://nedlab.com/wp/wp-content/uploads/2014/06/Kef-spec-sheets.pdf

So. If anybody has specs on the Kef 107/2's B250 sp1215 driver, I'll be interested.

- Mounting dimensions
- The actual volume of the speaker.

TIA

Lee
_________________
Current line up
2 sets basic Kef 104/2
2 sets bi-wire Kef 104/2
Plenty of KEF components for a few fun builds

[speakerguru]

It's an in-house, OEM only drive unit. I don't think anything was ever published. You'll have to hope that some documentation from a keen owner or ex-owner comes to light but I wouldn't hold my breath if I were you.

The motor (magnet and voice coil) are virtually the same as the B300, so, using the same Bl and allowing for the smaller area and some guess-timate of moving mass, it is theoretically possible to calculate Qe, Qe and Qt. My brain hurts now - I'll have to have a lie down.