O P E R A T I O N 
AUTO TURN-ON / SLEEP MODE
The TRM10s/TRM12s subwoofers automatically turn on when they sense an input signal. When the signal being fed to the TRM10s/TRM12s is turned off, the subwoofer's amplifier will turn off and go into "sleep mode." This feature eliminates the inconvenience of operating a mechanical switch.
INPUT SENSITIVITY
The Input Sensitivity is used to match the TRM10s/TRM12s with signal levels from a variety of mixing consoles. The Input Sensitivity uses a potentiometer to match input levels over a 30dB range and is variable from +1dBu to -30dBu. The numbers listed on the back panel indicate the input in dBu required to produce an output of 100dB SPL @ 1 meter. When the control is set to its full CLOCKWISE position the monitor is matched to +1dB input level (the input circuit is less sensitive to the amplitude of the input signal). When the control is set to its full COUNTER CLOCKWISE position the monitor is matched to -30dB input level (the input circuit is more sensitive to the amplitude of the input signal).
LOW-PASS CROSSOVER
The Low-Pass Crossover is used to set the electrical cutoff point of the subwoofer enclosure. The Crossover uses a variable potentiometer to set the cutoff point anywhere between 40Hz and 140Hz. When the control is set to its full CLOCKWISE position the cutoff frequency is set to 140Hz Low-Pass. When the control is set to its full COUNTER CLOCKWISE position the cutoff frequency is set to 40Hz Low-Pass.
It is important to match the Low-Pass crossover point of the subwoofer with the High-Pass crossover point of the high frequency reference monitors. Mismatching the crossover points can cause dips or peaks in the acoustical response. Overlapping the crossover points (i.e., subwoofer at 60Hz Low-Pass & high frequency monitors at 50Hz High-Pass) will cause a peak between 50Hz and 60Hz. Underlapping the crossover points (i.e., subwoofer at 40Hz Low-Pass & high frequency monitors at 70Hz High-Pass) will cause a dip between 40Hz and 70Hz.
*This graph was generated by setting the variable crossover to
40Hz, 50Hz, 60Hz, 70Hz, 80Hz, 90Hz, 100Hz, 120Hz & 140Hz.
70 | 80 | 70 | 80 |
60 | | 90 | 60 | | 90 |
| | 100 | | | 100 |
50 | | | 50 | | |
40HZ | 140 | 40HZ | 140 |
120 | 120 |
Low Pass | Low Pass |
Electrical Crossover Response*
