Rowe NiteHAWK - Section: 3 Sound System Setup; Introduction; Extension Speaker Operation; 70-Volt Speakers

NiteHAWK Internet Jukebox Sound System Setup
22022602 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 3-4.
3. All speakers must be connected with the correct polarity (see Figure 3-1).
NOTE: The 70V phasing is reversed inside the output transformers. (See Figure 3-1 for
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 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 70 V
speakers. The power level in the 70 V 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.