Kenwood XR-1S Owner's Manual (pdf) - Page 11

THERMAL MANAGEMENT PROTECTION Remote controller (Accessory of KACX1D, Optional accessory for XR-1S.)
   : which affect the sound by causing distortion, etc. Setting this control cuts the frequencies below the respective frequency. This improves the reproduction performance of the speakers by eliminating unnecessary oscillations which will not become sound. ~ Cooling fan ! Power indicator When the power is turned on, the Power indicator lights. @ PROTECTION indicator Lights this indicator when the protection function is activated. (See page 3) # THERMAL MANAGEMENT indicator Lights this indicator when the internal temperature is high. $ BOOST LEVEL (Bass boost level) control Sets the level by which the low frequency range should be boosted. % Power indicator ^ FREQUENCY (Bass boost frequency) control Sets the center frequency around which the low frequency range should be boosted. English 11