This system was designed to fit into smaller rooms. Using a 12" pro sound woofer, the Tone Tubby 12" Alnico driver has a lightweight paper cone and a powerful Alnico magnet. Because it is built like a Lowther, it is a great match up sonically.

Due to the small size, this system opens up, with a big open soundstage even in small rooms. Dynamic, and 96 dB/watt efficient it warms up at low volumes, but can play surprisingly loud.

The Tone Tubby is extremely fast and articulate. Perhaps just a touch warm, its reproduction of string instruments is especially intoxicating. It only goes down to the 70 hz range, and a subwoofer is used to fill in the rest.

From 200 Hz up, the PM6a reproduces almost full range. Although the "low end" alnico driver, it has the classic Lowther sound, combining the speed and articulation that Lowthers are famous for with the warmth that an Alnico magnet brings.

The crossover is a bit unusual. Set at 200 hz, it is a 1st order (6 dB/octave) series crossover. As both drivers are 96 dB/watt efficient, there is no need for padding resistors. The series crossover looks unusual, but it simply sounds better than the more common parallel crossover in this system (try it both ways if you don't believe me).

Use of a high quality crossover capacitors is necessary for best results. I used a 40 uF ASC oil cap (great bass and mids), and bypassed it with a 10 uF Axon (to extend the highs) and a 2 uF Dueland copper cap (adding tremendous extension and low level detail). The combination was extremely satisfying. Of course, you should build your crossover to suit your taste.

Below are links to the drawing and crossover diagrams. Commercial rights are reserved, but please feel free to build a pair for yourself.

Drawing

Crossover