3 way reflex Tri-amp
Frequency response: 22Hz-20KHz
Impedance: 8 Ohm
Drive units: HF; 25mm (1") Dicast fabric dome IMP transformer, LF; 2- 8" bass Dicast Homopolymer, 2- 6" midrange Dicast Homopolymer
Input connector: 5 way post
Weight: 86kg (189.5lbs)
Finish: Black ash
The 767s required a special external crossver (LFAU) along with the Cyrus amp in order to run them properly and are very hard to find.
"The Low Frequency Alignment Unit (LFAU) was originally designed around the award wining Cyrus II integrated amplifier for the primary use with the Mission 767 loudspeakers. The LFAU was a dedicated amplifier for the bass units of the 767 and the remainder of the units were controlled by a standard integrated amplifier. The controls on the LFAU differ from those of a standard amplifier as the bass response of the 767 system could be fine tuned to suit the listening environment."
A PDF of the LFAU setup and instructions located here.