AP25 Installation and Operating Guide
Page 40
AP25 Installation & Operating Guide
Document # 9301H79500 Ver. 1.00
5. Turn on
XCurve Display
. Try to tune the frequency pattern to the XCurve. If the pattern does
not conform – there is a hole or a peak or other variance – then select the frequency that needs
adjusting, and push it down or pull it up.
6. Select a frequency in the lower panel by touching the green bar for the specific frequency.
Once selected, the bar will turn yellow and allow adjustment.
7. Use the adjustment knob to adjust the frequency up or down.
8. Repeat the above for each channel except the subwoofer (LFE).
2.10.2.1
A note about XCurve
XCurve is the industry standard roll-off applied to all cinemas. The XCurve is flat to 2k, and
then rolls off 3dB per octave. The
Third Octave EQ
screen offers three ways to look at the
XCurve. XCurve is appropriate for both film playback and digital cinema.
XCurve Off
is just the natural display that gives you a flat response.
XCurve Offset
adds the 3dB per octave roll off starting at 2k. When in this mode you
should adjust the response flat.
XCurve Display
(shown below) shows the guidelines. The two narrow lines are the plus
and minus range of 3dB that is allowable. The heavier center line is the optimal level.
The scale (y-axis) on the left edge of the RTA is adjustable. Touch the scale and it will cycle
through several different scales. You can also adjust the scale by touching the
RTA Options
button, which displays a control dialog.
Menu (System) > Formats > EQ Setup > Third Octave EQ > RTA Options > XCurve
Display
Figure 18. XCurve Display at +/- 6dB Scale
