Source; Polarity; Gain; Eq Bypass - Mackie SP260 Owner's Manual

Source

There are three input sources to choose between:
• InA = Input A
• InB = Input B
• InA+InB = A mono sum of Input A + Input B
If you are running a stereo system, choose either
Input A or Input B. If the system is mono (or has a
mono component such as a subwoofer or a single
loudspeaker mounted in a venue's lobby, for example),
go with the Input A + Input B choice.
Use the Edit2 [8] or Edit3 [9] Wheel to change
between these three options.
Press the ESC button [11] to exit input source
editing mode.

Polarity

Polarity inversion is often helpful in improving phase
alignment throughout the loudspeaker system, whether
used separately or with a small amount of delay. For
example, if a subwoofer doesn't sound "full", invert the
polarity to see if that doesn't solve the issue.
Turn the Edit2 [8] or Edit3 [9] Wheel to scroll
between Polarity = Normal [default] and Polarity =
Invert [180˚].
Press the ESC button [11] to exit polarity edit mode.

Gain

In some cases you may need to adjust the output
levels differently to properly balance the system
components for ideal performance.
Use the Edit2 [8] or Edit3 [9] Wheel to change
the gain by ±0.1 dB per click. Turning these wheels
clockwise increases gain, while turning them
counter-clockwise decreases gain. The gain ranges
from –12.0 dB to +6.0 dB.
Press the ESC button [11] to exit gain editing mode.

EQ Bypass

EQ Bypass flattens the 7-Band EQ on the output so
you may hear exactly how it is affecting the system.
By toggling the EQ Bypass on and off, you may quickly
compare the sound with and without EQ.
Turn the Edit2 [8] or Edit3 [9] Wheel to scroll
between Bypass = Off [default] and Bypass = On.
Press the ESC button [11] to accept the new EQ
Bypass mode and exit the EQ Bypass editing mode.

7-Band EQ

Output EQ is used primarily for adjusting the
response of a particular loudspeaker or transducer.
Additionally, output EQ may be used to correct room
anomalies in multi-room setups.
Use the Nav/Edit1 [7] Wheel to change the
frequency. Turning this wheel clockwise increases
the frequency, while turning it counter-clockwise
decreases the frequency. The frequency ranges from
20.0 Hz to 20.0 kHz.
Use the Edit2 [8] Wheel to change the bandwidth
by ~±0.05 per click. Turning this wheel clockwise
increases the bandwidth, while turning it counter-
clockwise decreases the bandwidth. The EQ band may
be configured as high or low shelf by turning it all the
way counter-clockwise.
These are the EQ choices from the furthest counter-
clockwise option to the furthest clockwise option:
• –12 High Shelving
• –6 High Shelving
• –12 Low Shelving
• –6 Low Shelving
• 0.05 – 3.00 [Parametric]
To change the EQ between shelving and
parametric, the gain must first be set to 0.0 dB.
Use the Edit3 [9] Wheel to change the gain by
~±0.5 dB per click. Turning this wheel clockwise
increases the gain, while turning it counter-clockwise
decreases the gain. The gain ranges from –15.0 dB to
+15.0 dB.
Press the ESC button [11] to exit the EQ editing
mode.
Owner's Manual
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