The Fine Things are Always Hand Made

All Wave 15 Tweeters

I was wondering if anyone had ever added tweeters to an All Wave 15? The permanent magnet kind like in a Philly not the field coil type like in an AW 23? I would like do that if someone could recommend the best way to wire them in. Thanks!

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Permalink Reply by David C. Poland on March 19, 2019 at 10:46pm

Hello Buzz.

Adding tweeters was not contemplated by Scott at the time nor did the pedestal speaker (a special Jensen) have a terminal strip to access the output transformer secondary. In 1934, 5 thousand cps was considered high fidelity broadcasting and well within the capability of the Jensen pedestal Scott supplied. Don't know if the interstage and output audio transformers and audio circuits design would support higher fidelity audio from sources such as an FM tuner or CD player using the phono input. Finally, pre WW2 voice coil impedances were not standardized to 4, 8 and 16 ohms like since the 1950's. For example, AW-23 speakers were 38 or 19 ohm impedance - about 30 or 15 ohm DC voice coil resistance with a meter, respectively. I do not know the impedance of your speaker voice coil, nor is it in any Scott documentation I know of.

My thoughts are: First determine your speaker's voice coil impedance. Then find one tweeter (or two tweeters in series) to closely match the the main speaker voice coil impedance. Use a cap to pass only higher frequencies to the tweeter(s) like Scott did using 2 MFD cap in series for the AW-23 and Philharmonic tweeter pair. And figure out a way to access the output transformer secondary. Wire the tweeter in parallel to the main speaker voice coil and observe the polarity.

If you proceed, please report back on your effort and if tweeters made any audible difference. Good Luck.