Here the final SBA-61 construction.

The SBAcoustics SB17NRXC35-8 driver obviously fit right into the cabinet used for the two other constructions.

Hard pressed paper cones offer very much the same level of transparency as other hard cones.

They also share the same cone break-up at higher frequences like aluminium, hence must be treated accordingly, i.e. 4th order filters. Only a few changes from the 61-NAC crossover had to be made. As can be seen below, a fairly straight forward LR4, 4th order filter.  

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