Profile HA1000 User Manual

If so desired the amplifier may be run in stereo and mono at  the same time.  For example, this 
feature would allow you to run a pair of mids and tweeters in stereo and a subwoofer in mono.

Automatically turns amplifier on when connected to the head unit's remote output.  The 
amplifier will turn on and off with the head  unit to save current consumption.  This control also 
operates the reset circuit for the amplifier's protection.  It must be  connected with the head 
unit in order to reset protection circuits.

Allows you to fine-tune the level matching between your source and the power amplifier. 

Heavy gauge power and speaker terminals with protective covers are provided for maximum 
power and signal transfer with minimal resistance.   

under stereo mode and 4 ohm or greater impedance load under bridged (mono) mode. For

For 2 and 4 channel amplifiers, they are stable with a 2 ohm or greater impedance load

mono subwoofer amplifiers ( HA700M & HA1000M), they are stable with a 2 ohm or greater 
impedance load.

This protects the amplifier against short circuits and excessive current.

This circuit protects the output of the amplifier against DC voltage.  If for some reason DC 
voltage is detected at the output stage, the amplifier will shut down protecting the speakers 
from direct current.