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604's Forever!
The first production 604 appeared in 1944 and quickly became the industry
standard. The 604 is a "Duplex®" or coaxial loudspeaker utilizing a 15" woofer
and a 1" throat HF compression driver (1.75" voice-coil). The HF magnet mounts
directly to the back of the woofer magnet and the throat of the HF driver extends
through the center of the woofer to a small horn. This basic configuration has
remained unchanged for 50 years . . .
604 B,C,D,E
System
16 ohm
Impedance
Magnet
Alnico
HF Phase Plug
Circumferential
Horn Type
Multicellular
Woofer Frame
15.2"
Rear Mount
Crossover
N-1000-B (B)
Network
N-1600-A(C,D)
N-1600-A (E)
Crossover
1000 Hz (B)
Frequency
1600 Hz (C,D)
1500 Hz (E)
Power Rating
30W (B)
35W (C,D,E)
Notes:
604 B,C,D,E
= Only small differences in construction. The B/C used a true multi-cell horn and the
D/E used a sectoral-style horn with divider vanes.
604-8G
= New crossover and diaphragm assembly improved power handling, delivered smoother
mid-range, and exhibited lower distortion
604-8H
= New Tangerine® phase plug and Mantaray® horn improved high frequency coverage.
New crossover network offered HF and MF controls.
604-8K
= New magnet offered same flux density as Alnico. Improved adhesives resulted in
higher power handling.
604-8L
= Same as K with new crossover network,
hand-built for Altec Lansing Professional by Great Plains Audio, USA
Gary R. Jones
1000 W. Wilshire Blvd. Suite 360
Oklahoma City, OK 73116
Tel: 405-848-3108
Fax: 405-848-3217
604-8G
604-8H
8 ohm
8 ohm
Alnico
Alnico
Circumferential
Tangerine®
Multicellular
Mantaray®
16"
16"
Front or Rear
Front or Rear
Mtg.
Mtg.
"604-8G"
"604-8H"
LF = 12 dB/oct
LF = 12 dB/oct
HF = 18 dB/oct
HF = 18 dB/oct
1500 Hz
1500 Hz
65W
65W
Pink Noise
Pink Noise
604-8K, L
8 ohm
Ferrite
Tangerine®
Mantaray®
16"
Front or Rear
Mtg.
"604-8K" (K)
"N1500-8A" (L)
LF = 12 dB/oct
HF = 18 dB/oct
1500 Hz
75W
Pink Noise
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