Pressing ENTER displays Page 2 on the screen:
Make sure your POWER-Q is in place in the system (typically between the mixer output and the power
amp or crossover input), your system is turned on, your reference microphone is in the correct position,
oriented correctly, and plugged into the “Ref A” jack on the POWER-Q back panel, and you are ready to
play your audio program (a prerecorded CD will work fine) at performance levels.
High Frequency Roll-Off Compensation.
The POWER-Q automatically calculates its room response curve to
either compensate or not for the high frequency roll-off detected by the reference mic as a function of
distance from the speaker playing the test signal. High frequencies are absorbed over distance to a
greater degree than low frequencies. If the reference mic detects attenuated high frequencies, the
POWER-Q will boost highs in the Room EQ curve to make up for this drop-off if “do not compensate” is
chosen. This may result in an overemphasis of high frequencies for audience members closer to the
speakers than the reference mic.
When the “Compensate” option is chosen, the POWER-Q inserts a high-frequency roll-off filter (12dB per
octave) to compensate for this overemphasis. The POWER-Q automatically measures the distance from the
speaker to the reference mic with a test tone, and calculates the appropriate roll-off, depending on the
speaker-to-mic distance. To summarize, selecting COMPENSATE will cause the Automatic Room EQ
analysis to produce a response curve with more high frequency information at distances closer to the speak-
ers.
In small rooms this compensation may not be necessary. To implement, simply highlight your choice to
compensate or not. Now play your test audio through the system. Set levels to concert volume, as the
POWER-Q will calibrate to the level you establish. Once the audio is playing, press “ENTER” again.
If the POWER-Q detects insufficient level at its inputs, this screen will notify you of the absence of signal in
either or both channels, as shown below:
Note that this INSUFFICIENT LEVEL message refers to the INPUT audio signal present at either or both
inputs of the POWER-Q. You must play and audio signal (CD, tape or live music) long enough for the
POWER-Q to detect the signal and establish an operating level. This will typically take only a few sec-
onds; then you can turn the audio signal. The input signal will be muted once the Automatic Room EQ
analysis begins.
If there is no signal in channel A or B, either your connections to the POWER-Q are bad, the POWER-Q may
be in bypass (“BPASS” will flash in the upper right of your screen. Turn it off in the “GLOBAL PARAMETERS”
menu.) or you are not providing an audio source to the POWER-Q. Check your connections, play your CD
and press "ENTER".
Section 9: Auto Room EQ
26
Fig. 27: Automatic Room EQ, page 2.
Fig. 28: Auto Setup page 3
