Vintage Asylum: Re: I just removed the drivers from my 305 by AudCon Classic gear from yesteryear; vintage audio standing the test of time.

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Posted by AudCon (P ) on December 17, 2003 at 23:23:37

In Reply to: I just removed the drivers from my 305 posted by slxrti on December 17, 2003 at 20:45:33:

Well, the B-305 should have two B-207's, one 16 ohm B-209, B-209A or B-209B midrange and an N-10102 midrange.

A B-207 is the coax setup in which a Bozak tweeter pair is mounted across the front of a B-199A woofer on a cast metal bracket. It was building-block arrangement - a buyer could start with a 302A or 305 cabinet with just a single B-207 coax. When the B-207 was used without a midrange, the "crossover" was a single capacitor which brought in the tweeters at the natural rolloff frequency of the woofer. You will not find the number B-207 anywhere; it's the combination of a B-199A and a tweeter pair, each of which have their own numbers.

When finances allowed adding to the system, a second B-207 could be added to the two-woofer B-305. The third step (second step in the case of a single-woofer 302A) was to add a midrange and three-way crossover network.

The full B-305 is a 16 ohm system. Each B-207 is 8 ohms. The two are connected in series for 16 ohms, which reqires the use of the 16 ohm connections of the N-10102 crossover network.

The N-10102 was a convertible network, covering both 8 and 16 ohms depending on the system, and a choice of woofer/midrange crossover frequencies.

So that's what you should have - two B-207's, each consisting of a B-199A woofer and a tweeter pair, you stated that yours are B-200X, plus a 16 ohm B-209 (or later version) and N-10102 crossover.

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