Once the indication contains a substantial red content it should be considered as a sign that the level is too high and may cause speaker damage if allowed to continue. INPUT CONNECTORS The 270-PR0 is supplied with a combination 3 pin balanced XLR and 3 conductor %” Phone jack. Onthe XLR jack, pin 1 is ground, pin 2 is POSITIVE & pin 3 is NEGATIVE). On the phone jack, TIP is positive, RING is negative & the sleeve is ground. Fully discrete active input circuitry is used; i.e. no transformers.