Here's some pictures of the 5 new speakers I'm designing and building. They use the Vifa TC14SG mid-woofer, and the Vifa TC26SF tweeter. The crossover and cabinet design are my own design.
The cabinets are sealed 7 litre or so enclosures designed to give an F3 of 80Hz as per the THX spec. This combines with the 2nd order butterworth highpass at 80Hz which my receiver applies when one specifies small speakers to give a 4th order Linkwitz Riley highpass. This fits in nicely with the 4th order Linkwitz-Riley lowpass from either my DIY subwoofer amplifier or my AV receiver.
The cabinets are made primarily of 18mm MDF which has simply been butt jointed together and glued and screwed. They are then covered in 6mm thick recycled Rimu, a native timber of New Zealand. This timber has been split off and dressed from pieces of 4x2 that were originally part of an old hall in Wellington. It is around 100 years old or so. The rimu is glued and clamped on to the MDF so as to prevent future movement and splitting. This shouldn't occur as the rimu has probably done most of the moving it wants to do in the 100 years or so it has been since it was originally milled. The tweeter is flush mounted, and the woofer surface mounted.
The crossover is a 4th order acoustic Linkwitz Riley configuration at around 3kHz, and electronically this means a 2nd order lowpass on the mid-woofer, and a 3rd order highpass on the tweeter. Phase tracks well over the crossover region. Click here for more information and plots on the response of the crossover.
I hope to update the site in a few weeks or so when I get around to it. In the mean time, here's some pictures of the cabinets.
Enclosure shots
Corner Detail
Wood grain of the recycled Rimu
Drivers in place
Tweeter detail
Woofer detail
Hope you enjoy the site. For more info, contact me via the link to your left.