B & G Sonic Speed, power supply polarity

[Moonshadow]

The power supply terminals in the control box of this unit are marked
"BR 10" and "BL 9".

Can anyone tell me which of these is the positive terminal please.
The Owners Manual is mute on this point.

 

[Moonshadow]

Many thanks.

See diagram 4.2 on Page 11:

http://www.bandg.co.uk/upload/BandG/Documents/Manuals/sonicinstall.pdf

It shows "BN" (+) going to terminal 10 and "B"/"BL" (-) going to
terminal 9.