Rowe GrandSTAR, Руководство по обслуживанию

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Grand STAR Internet Jukebox Sound System Setup
22022603 3-3
Selecting Speaker Power
General Instructions
This section will lead you through the power and speaker selection process. This process
consists of three
major steps and several smaller steps. The major steps are:
1. Identifying the extension speakers and computing the speaker power for speakers
connected E1 to E7, 70V speakers connected A1 to A2, and tapped speakers connected
to E1 through E6.
2. Making the extension speaker connections.
3. Performing an amplifier overload check per instructions immediately following
Table 3-5.
Selection Procedures
Use a pencil (you may want to revise your figures) to fill in the Extension Speaker
Worksheet on the following pages:
Extension speakers are available in these general categories: General purpose speakers
(4 and 8 ohm speakers) and 70V speakers. The power level in the 70V speakers is set at
each speaker.
Use the
Tables 3-1 through 3-4 Worksheets to help you calculate the amount of power
consumed by the extension speakers.
An extension speaker RMS power rating should be at least 10% higher than the power it will
consume at maximum jukebox volume.
When RMS power to speaker
at maximum jukebox volume is:
Then recommended RMS power
rating of speaker is:
250 watts 300 watts
125 watts 150 watts
62.5 watts 75 watts
31.25 watts 40 watts
Table 3-1
-
Extension Speaker Worksheet
Sheet 1
Extension Speakers Connected E1 to E7
Place the quantity of speakers in the blank under QTY and multiply the quantity times the
power consumption. Place your results in the blank under TOTAL .
Qty Total
CH 1 CH 2 CH 1 CH 2
Two 8-ohm speakers in series:
(31.25 watts to each speaker) ____ ____ at 62.5 watts per series = ____ ____ watts
Two 4-ohm speakers in series:
(62.5 watts to each speaker) ____ ____ at 125 watts per series = ____ ____ watts
8-ohm speakers: ____ ____ at 125 watts each = ____ ____ watts
4-ohm speakers: ____ ____ at 250 watts each = ____ ____ watts
(Continued on next page)