James Loudspeaker M1000 - Manual (Page 11)

Page 11
Delay msec
The delay feature allows delaying the sub signal up to 30 msec
or approximately 30 ft. This is useful for aligning arrival times of
rear subwoofers with the front subwoofers. The “Delay msec”
feature displays the actual delay setting which will be in the
“units” as set in the previous menu item.
D e l a y u n i t s
* m s e c .
Display Setting
The “Display” setting has 2 options to control the LCD display
brightness, ON and 30 seconds. When set to “On”, the LCD
display is always illuminated. When set to 30 seconds, the
display back light will turn off after 30 seconds if no button is
pressed.
Use “left” and “right” push buttons to set and “menu” to save.
Delay Units
The delay feature allows delaying the sub signal up to 30 msec
or approximately 30 ft. This is useful for aligning arrival times of
rear subwoofers with the front subwoofers. The “Delay Units”
feature is set to msec, feet or meters, use whichever unit you
are most comfortable working in.
D e l a y m s e c .
*
1 0 . 0
Limiter setting (dB) % of max 8ohm Watts 4ohm Watts
0 100% 500 1000
-1dB 79% 397.2 794.3
-2dB 63% 315.5 631.0
-3dB 50% 205.6 501.2
-4dB 40% 199.1 398.1
-5dB 32% 158.1 316.2
-6dB 25% 125.6 251.2
-7dB 20% 99.8 199.5
-8dB 16% 79.2 158.5
-9dB 13% 62.9 125.9
-10dB 10% 50.0 100.0
-11dB 8% 39.7 79.4
-12dB 6% 31.5 63.1
Limiter
The limiter function allows setting the maximum power which will
be supplied by the M1000. This is useful for preventing over-
powering smaller subwoofers. Like most audio amplifiers, the
M1000 is a voltage amplifier and delivers voltage to the load.
But the actual power depends on the impedance of the load, so
the limiter is set by -dB, which are independent of actual power
but indicate level reductions. The load on the M1000 can be 1 or
2 subwoofers, as long as the total impedance remains 4 ohms
or higher. The limiter is set in -dB, which is the dB from full power
which at 4 ohms, is 1000 watts, but only 500 watts at 8 ohms. A
-3dB reduction is half the power so 3dB changes are bolded in
the table since they are an easy reference point.
Once a limiter setting of anything but “0” is set, the limiter icon
appears on the display (see illustration) and the red clip indicator
on the front panel, which normally indicates full power clipping,
will now light when the limiter maximum power is reached.
Limiter On