Probably the most successful audiophile electronic crossover - the TA-D88B sold very well, and in much larger quantities than any model from Pioneer or Accuphase.
Updated in early 1981 to become the ESPRIT TA-D900 with, besides looks, minor layout and PCB differences.
The D88's lowest frequency module (Module 1) starts at 140Hz, a frequency pushed back byt the TA-D900 with the addition of Module 0 which allowed to start at 50Hz.
The specifications between the TA-D88B and the TA-D900 are however exactly identical but the D88B shows even less distortion ;-)
The modules, tagged in blue for the D88B, and in red for the D900, are also identically built ; the eight pots are all 2-gang ALPS.
In Japan, a special module was made available before the D900 came in : the S1. It allowed to start the low crossover at 62,5Hz, 100Hz or 125Hz instead of the 140 / 225 / 280Hz of the normal Module 1.
In Germany, a special module was very briefly offered for the (very few) SS-G7S owners : the 7-1
Nudies of a JP unit here.