2011 Fifty Two's

added July 3rd 2011 (crossover details added)

right speaker

built June-July 2011 just in time for my 52nd Birthday!

Drive Units = 1988 SEAS CB17 RCY bass mid and 2007 Fountek NeoCD 1.0 ribbon tweeters

Cabinet details;

These are very chunky 33mm thick mdf cabinets, topped with a 10mm thick ply baffle.

The ply has been stained with a wattyl Nordic Pine, the stone finish was the accidental result of using a hot air gun on an earlier Hammerite blue metal finish. Somehow the panel burn adds to the stone effect. A sheen has been added with a satin varnish. The front baffle has been polished using Gilly Stephenson's dark restoration wax (this helps to increase the tone)

Crossover details.

The Fountek NeoCD1.0 is a nice sounding unit which according to spec extends up to 40KHz. It is efficient but has a low power handling (up to 25W) The SEAS CB 17 works well up to 4000Hz. I decided on a hign XO point to test this claim and almost use the Fountek more in the upper range. This also means that I can get exactly the right parts from my local Jaycar.

The crossover is a first order Butterworth featuring a 5.6uF SUNTAN metallised polypropylene caps mounted in series with the ribbons and a 0.22mH inductor in series with the bass. The internal volume is just under 18L which falls under the range specified for an infinite baffle

The sound

I'm on a winner here!

Brilliant mid range detail, very good image and a bass that really fires up after about a 30min session. They also seem quite efficient when compared to my "bete noire" speaker from a few years earlier

They sit on high mass ATACAMA SE24 stands

The sound

THESE ARE VERY ACCURATE + MUSICAL LOUDSPEAKERS

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