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The Buchla 100 series' four-band filter (1960s), one panel unit wide, in its CBS Musical Instruments aluminium panel printed in blue: it "divides an input signal into four frequency bands. Cross-over frequencies are 200 cps, 900 cps, and 4 kc. Slopes have sharp knees and are 12 db/octave" (the 100 series catalogue). One INPUT and four bands, below 200, 200 to 900, 900 to 4 kc and above 4 kc, each on two jacks.

Key features

• Four bands, crossing over at 200 Hz, 900 Hz and 4 kHz
• 12 dB/octave slopes
• Each band on two outputs