Page 16
National Communications
BMS2 INSTALLATION
when using an Amplifier
Please refer to the Installation Diagram on page 16.
BMS2 provides a Stereo Line Level output, which is designed to connect
direct to a separate Amplifier.
The separate Amplifier is then used to power the required number of
speakers (usually 100V paging/music speakers)
The amplifier used should have a power rating (W), greater than the sum of
the tapping setting of all speakers connected to it.
If higher volume is required on one or more speakers, then you may increase
the tapping to a higher W setting.
SPEAKER CABLE
You should use figure 8 speaker cable with a power rating suitable for the
amplifier which you plan to use.
You can use ‘Light Duty’ , such as 14/0.14 for amplifiers with an output of
50W RMS or less.
For amplifiers with a power rating of greater than this, you should use ‘Heavy
Duty ‘ 24/0.20.
100V SPEAKERS
BMS2 units are designed to operate with standard 100V PA or Background
Music speakers, which are typically Ceiling Mounted or Wall Mounted.
100V Speakers are designed to connect in Parallel fashion, as indicated on
the Installation Diagrams.
This means that the amplifier connects to one speaker, direct onto the
appropriate tapping of the 100V speaker transformer. The next speaker
connects from that same point, and so on to the last speaker, in a ‘daisy
chain’ type fashion.
