You may need to turn up your system gain downstream from the POWER-Q. Check your micro-
phone and connections, and repeat the procedure as needed. Note that the POWER-Q will
automatically turn on or off the 20dB mic reference mic pad, as needed.
In rare instances, conditions may arise in which your microphone will not hear much energy from a
1KHz tone due to one of the following conditions:
·
Crossover settings. If you are using a crossover that produces low frequency response at 1
KHz due to its settings, your system may not produce much sound in this frequency band, and
the reference mic may register insufficient level. Try changing your crossover frequencies.
·
Room modes and phase cancellation. It’s unlikely but possible that the acoustics of the room
in which you’re set up may tend to de-emphasize 1KHz at particular locations, due to the out-
of-phase cancellation of direct and reflected sounds. Try moving your microphone position.
Once levels are sufficient, the screen below will appear:
When the microphone hears the signal, the POWER-Q will time how long the signal takes to
reach the microphone from each channel’s output, and adjust the delay times to make the signals
arrive after the same length of time (subject to the 83.2 millisecond maximum value). The
POWER-Q will revert to displaying the DIGITAL DELAY screen; however, each speaker’s output
delay, and the distance from each speaker to the reference microphone, will now be displayed,
and the speaker outputs will be aligned - as shown in the screen below:
The entire procedure takes just a few seconds.
Note that the accuracy of the POWER-Q’s measurement of speaker distance will generally be
c/- approximately one foot. Higher frequencies than 1 KHz will produce greater accuracy,
but may present other measurement problems for sound systems with roll offs in high end fre-
quency response. In addition, in rare instances the reference microphone may confuse direct and
reflected sound, and err in its distance measurement by up to 5 feet. When in doubt, run the auto
setup several times and compare results.
22
Section 8: Digital Delay
Fig. 22: Auto Delay Report Screen
Fig.21: Auto Delay Setup page 6
