GrandSTAR Internet Jukebox Sound System Setup
22022603 3-11
Speaker Synopsis
1000 Watts of RMS Power per Amplifier or 500 Watts per Channel.
The generic speaker wiring diagrams cover 4 to 32 speakers.
These speakers are expensive, providing a lot of sound in a localized area, which does not
always optimize the room sound. If you perform power calculations on these speakers, you
will note that we are recommending a higher rating that absolutely necessary. This is to
provide a safety factor and will also provide extended life for the speakers.
The best way to distribute the sound is by adding more speakers.
Diagram 1 has a six-speaker layout. The recommended power handling capacity of each
speaker is shown in the diagrams.
Diagram 2 has a layout of 10 speakers each having a lower power rating than those in
Diagram 1. The expense factor should now be less for each speaker.
For an extremely large room, Diagram 3 may be the best scenario. Diagram 3 shows a
series/parallel hookup with up to 16 speakers. The advantage is that the minimum power
ratings are even lower. This gives you a lot of sound at a reasonable price. To ensure the
speakers work correctly, the pairs wired in series should be of the same make and model.
Different models wired in series will not give equal outputs, and the frequency response may
be different.
To minimize cost, it is recommended to utilize Diagram 4. This shows 28 speakers, their
rating only has to be 8 ohms at 50 watts. This allows you to use inexpensive speakers, that
can be found at the big electronic stores. This also provides you the chance to switch them
for the best sound. Try also to get the most efficient speakers.
Diagram 5 shows further loading using the 70-volt taps on the Output Transformers. This
may be preferred if you have a second zone that is far from the jukebox.
Using these diagrams as a guide, you will readily see how many different schemes can be
achieved. Keep in mind that you can also disconnect the internal jukebox speakers giving
you even more freedom with external speakers. The key things to keep in mind that the load
on each channel must be less than 500 watts and that the maximum you can connect via
the Output Transformers (any connections not
across E1 and E7) is 125 Watts per channel.
Figure 3-4 Diagrams 1N through 3N illustrate some schemes that require you to disconnect
the internal jukebox speakers.
The connection of the optional second optional amplifier is done following the same
guidelines as for those where the internal jukebox speakers are disconnected. When
connecting the second amplifier, Figure 3-4 Diagrams 1N through 3N can be used as a
guide to a few possible connection schemes.
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