Thanks for the yahoo suggestion. I also have copy of the Test Report done by Stereo Review in Feb. 94. According to the Report both RDL Acoustics F-1 and FS-1 speaker systems are identical in almost every respect. Both models use a 2-kHz crossover, with 6-dB-per-octave slopes and have a sensitivity of 87 dB sound-pressure level at 1 meter with a 2.83-volt input. The only difference in the 2 models is the F-1 has its woofer on the top facing up where the FS-1 is a conventional set up. There are complete spec's in this Report, but no schematic.