BROADCASTING
The recommendations above for recording apply also to broadcasting. Feeding the
signal electrically is preferable where possible, and the power amplifier connection
shown in figures 7 and 8 is desirable because it gives the benefit of reverberation.
The voice coil circuits are of 1 to 8 ohms impedance (depending on type of tone
cabinet), with one side grounded and the output voltage is of the order of 1 to 2
volts at normal playing levels. A coupling transformer may be used if it is
necessary to isolate the circuits.
The G to G Connection shown in figure 9 is a 2OO ohm circuit with grounded
center tap, and the signal voltage at normal playing levels is of the order of
2 volts.
If microphone pickup is preferred, the usual arrangement is to place a microphone
about three feet above the top of the tone cabinet and inclined at an angle of about
45 degrees. Because types JR-2O, H-40, and HR-40 tone cabinets use bass and treble
speakers pointed in different directions, the microphone should be placed at least
10 to 15 feet from cabinets of these types.
CONNECTING TO PUBLIC ADDRESS SYSTEM
It is not recommended that Hammond Organs be connected to play through a public
address system. Most PA systems emphasize the higher frequencies, particularly in
the voice range, and this will result in a serious lack of bass response in the
organ music. In addition, the usual placement of PA equipment, with many speakers
distributed over an area, tends to diffuse the organ music beyond a useful degree.
If it is essential that such a connection be made, use power amplifier output
connections shown in figures 7 and 8.
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