Rowe GrandSTAR, Руководство по обслуживанию

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Grand STAR Internet Jukebox Sound System Setup
22022603 3-1
Section: 3 Sound System Setup
Introduction
See the included manual “Network Setup, Jukebox Operation, Operator Setup Screens” if
you have any questions about setting up the Network or the jukebox for operation.
Extension Speaker Operation
To avoid a poor sound quality, care must be taken when adding extension speakers. The
following two requirements must be met:
1. Speakers connected to the Output Transformer Assembly
must be wired so the power
consumed by the extension speakers does not exceed the amplifier power rating of 500
watts per channel.
An Output Transformer Assembly has two transformers, two 7-position terminal strips
marked E1 through E7, and a 4-position terminal strip marked A1-A2, A1-A2 (see
Figure
3-2 ). Speakers wired E1 to E7 bypass the transformer and are driven directly by an
amplifier channel. Each transformer provides 70V at terminals A1, A2 for driving 70V
speakers, and provides taps E1 through E6 for driving extension speakers at a lower
volume. The power consumed by speakers driven by a transformer (E1 through E6, and
A1-A2) must not exceed the transformer rating of 125 watts.
The power consumed by speakers connected E1 to E7, and connected to a transformer
(E1 through E6, and A1-A2) must not exceed the channel rating of 500 watts. For
example, each channel could drive 375 watts directly from the amplifier (E1 to E7), and
the remaining 125 watts through the transformer (taps E1 through E6, and 70V terminals
A1, A2). (See
Figure 3-1 ).
2. Complete the Extension Speaker Worksheet ( Tables 3-1 through 3-4 ) for each channel
and verify it does not exceed the 125 watt transformer rating and the 500 watt amplifier
channel rating. After wiring the speakers, perform an Amplifier Overload Check. Refer
to Amplifier Overload Check
immediately following Table 3-5 .
3. All speakers must be connected with the correct polarity (see Figure 3-1 ).
NOTE: Channel 1 output is reversed with respect to channel 2. This reversal is necessary to
extend monaural sound in a stereo jukebox system. Because of this reversal, speaker
connections to channel 1 must be reversed when compared to channel 2, except for 70V
speaker connections.
See Figure 3-1 for the correct polarity hookup of extension speakers. If
the (+) and (-) terminals are not wired properly, the speakers will be out of phase, causing a
reduction in low frequencies (bass).
Diagrams D1 through D5 (Figure 3-3 ) have been included to assist you with connecting
extension speakers E1 to E7.
Figure 3-1 shows the system speaker connections.
70-Volt Speakers
To avoid prohibitive cable losses on long speaker lines (over 100 feet), use 70V
speakers. The power level in the 70V speakers is set at each speaker. For each
channel, 125 watts are provided for 70 V speakers by A1, A2 connections on the audio
output transformer assembly.