I was always amazed at the Infinity IRS Series that came out in the early 80's. They had a set at a high end audio shop in Naha Okinawa. I could sit and listen to these for hours. They were $20,000.00 a set back then.
Introduced: IRS: 1980
Introduced: IRS V: 1988
Dimensions: Bass Tower: 228 x 52 x 73 cm
Dimensions: Mid/High Tower: 228 x 119 x 43 cm
Wight: Bass Tower: 681 kg (system)
Bass: 6 x 30 cm
Mids: 12 x EMIM
Highs: 36 x EMIT (12 on the back)
Suggested for amplifiers with: 100-300 Watts per Mid/High channel (bass towers have their own 2000 Watts amplifier)
Frequency range: 15 Hz - 45 kHz
Crossover frequencies: 70 Hz (variable), 4500 Hz
Special: Servo control unit for bass drivers