Hi,

I have two 165mm (6.50”) constant directivity Dual Concentric™ drivers taken from Tannoy iW60 EFX.

I am building new enclosures for them and I am missing the Thiele / Small parameters for the driver to allow me correct sizing of the enclosures.

Can somebody please provide these data specifications?

Please see identification number on the attached photo.

Thank you!

Breg

Sigmund

A couple of years ago, I bought a house that had a theater room in the basement.  The previous owner left the rear speakers installed in the wall.  I pulled one out and learned they are Tannoy iw60 efx boxes.  I found the manual online.  I'm a speaker noob.  I read the cinema mode is 4 ohms while a music mode is 8 ohms.  My receiver only goes down to 6 ohms.  So, I assume I need the speakers to be in music mode.  I have no clue how to do this.  I would appreciate any help.  Also, advice on whether these will be good rear surround speakers would be great.  Thanks!