604E2 drivers (16" frames and tangerine phase plugs)
and Mastering Lab crossovers.
Altec 604E Super Duplex - 1964-65/late 60's
HF horn: 90h40v
X-over: 1500 Hz
Power: 35 watts, 50 peak
Impedance: "8 to 16 ohms" was really nominally 16 ohms
Weight: 34 lb. including network
Magnet: Alnico V magnets
Response: 20Hz - 22kHz
Free Air Resonance: 25Hz
Frame: light grey paint
Cone: paper cone with an "accordian edge" cloth surround
comment: stamped basket diameter is 15"
harder to front load
Altec 604E2 Super Duplex
HF horn: 90h40v
X-over: 1500 Hz
Power: 35 watts, 50 peak
Impedance: "8 to 16 ohms" was really nominally 16 ohms
Weight: 34 lb.
Magnet: Alnico V magnets
Response: 20Hz - 22kHz
Free Air Resonance: 25Hz
Frame: cast frame grey paint
Cone: paper cone with an "accordian edge" cloth surround
comment: later 604E called 604E2 had the later 16" cast basket and tangerine phase plug
Altec 604-8G - early to late 70's
HF horn: 90h40v
X-over: 1500 Hz
Power: 65 watts
Impedance: 8 ohms
Weight: 40 lb.
Magnet: Alnico V magnets
Response: 20Hz - 22kHz
Free Air Resonance: 25Hz
Frame: cast frame dark grey paint
Cone: paper cone with an "accordian edge" cloth surround
comment: Sensitivity was improved - 100 dB SPL, 4 ft. on-axis 1 watt input
(pink noise band limited from 500-3000khz)
cast basket easily rear or front-mount
"tangerine" phase plug came in 1976 with no change in model number
604-8G's can be found w either circumferential phase plugs
or newer radial phase plugs with no indication on the driver label.