One position I think shorted out the LP inductor called 'extend' another position was normal and the last position put a cheap sand block resistor in series with the tweeter. They had a 3 position switch in the back. the cap was electrolytic the inductor was 18AWG I think and about 0.33 mH? Memory.not what it used to be. I had the second generation Advents I think the box size was 1.7 ft^3 same as the AR3a. Just some random thoughts that came to me immediately. Or, get a Mark Audio or Fostex FR that can easily do 1 KHz to over 20 KHz maybe start looking at the 3 inch FR's? You would probably get good results with this large tweeter Audax TW034X0 1.3' Textile Dome Tweeter There is a member here that just bought 4 pieces of the 4 Ohm version wholesale I may want two of those wants he receives them, you may want to consider the other two? Over half price off GREAT deal. Take a look at the Vifa/Tymphany/Peerless NE 265W 4 and 8 Ohm. In-room f3 is 37 Hz! It doesn't do mid or upper bass very well though. I have that SB29 in 33 liters with an Aperiodic vent.
