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  9. Altec Lansing 604 FOREVER ALL MODELS SUMMARY User manual

Altec Lansing 604 FOREVER ALL MODELS SUMMARY User manual

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Gary R. Jones
1000 W. Wilshire Blvd. Suite 360
Oklahoma City, OK 73116
Tel: 405-848-3108
Fax: 405-848-3217
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 604-8G 604-8H 604-8K, L
System
Impedance 16 ohm 8 ohm 8 ohm 8 ohm
Magnet Alnico Alnico Alnico Ferrite
HF Phase Plug Circumferential Circumferential Tangerine® Tangerine®
Horn Type Multicellular Multicellular Mantaray® Mantaray®
Woofer Frame 15.2"
Rear Mount 16"
Front or Rear
Mtg.
16"
Front or Rear
Mtg.
16"
Front or Rear
Mtg.
Crossover
Network N-1000-B (B)
N-1600-A(C,D)
N-1600-A (E)
"604-8G"
LF = 12 dB/oct
HF = 18 dB/oct
"604-8H"
LF = 12 dB/oct
HF = 18 dB/oct
"604-8K" (K)
“N1500-8A” (L)
LF = 12 dB/oct
HF = 18 dB/oct
Crossover
Frequency 1000 Hz (B)
1600 Hz (C,D)
1500 Hz (E)
1500 Hz 1500 Hz 1500 Hz
Power Rating 30W (B)
35W (C,D,E) 65W
Pink Noise 65W
Pink Noise 75W
Pink Noise
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