上点参数给大家参考。
Altec 755A
early to mid 50s
[alnico magnet]
Frequency Response: 70-13,000
Sensitivity: 81.5dB/8W/9M
Altec 755C
Introduced ca. 1961
[ferrite magnet]
Frequency Response: 40-15,000, Impedance: 8 ohms, Sensitivity: 95.5dB/1W/1.2M
Altec 755E
Replaced the 755C around 1969
[ferrite magnet]
Frequency Response: 40-15,000, Impedance: 8 ohms, Sensitivity: 92dB/1W/1.2M