thanks for the picture.
looks good from here .
seems these sound quite good as well -
looks like Bart is the father of the modern low frequency loudspeaker.
and utilized computers even before they were digital.
and all tube.
all analog.
you just know those computers sound better ...
looks like Shozo Kinoshita did design for tad as well -
http://www.reyaudio.com/history-e.html