PreSonus Eris - Manual (Page 7)

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5
Eris™ Series E4.5 Owner’s Manual
2.1.2. Power
IEC Power Connection. The Eris E4.5 accepts a
standard IEC C7 power cord. The power switch is
located on the front panel of the active E4.5.
AC Select Switch. The input-power voltage is set at the
factory to correspond with the country to which it was
shipped. Change the setting on this switch only if you are
using your Eris speakers in a country that uses a different
standard voltage than is used in the country where you
purchased your Eris E4.5.
Note: These controls are only available on the active E4.5.
2.1.3. Acoustic Tuning Controls
High. Boosts or cuts all frequencies above 10 kHz by ±6 dB.
Power User Tip: The High control on the Eris E4.5 is a high-shelf
EQ and attenuates or boosts frequencies above 10 kHz. This EQ
is much like the treble control on a car stereo: It raises or lowers
the gain on all frequencies above the specified cutoff frequency.
Shelving EQs can make big changes to the sound very quickly
by adding or removing an entire range of frequencies.
Mid. Boosts of cuts frequencies around 1 kHz by ±6 dB
Power User Tip: The Mid control is a peak EQ that
lets you boost or cut a specified frequency band (in
this case, a band about two octaves wide, centered
at 1 kHz). It’s capable of more subtle changes.
Low Cutoff. Rolls off the level of all frequencies below the
specified frequency (80 or 100 Hz) at a slope of -12 dB/
octave. This can be defeated by setting it to Flat, in which
case, the monitor’s natural roll-off takes over.
Acoustic Space. Cuts the level of all frequencies below 1
kHz by the specified amount (-2 or -4 dB) to compensate for
the bass boost that occurs when the monitor is placed near
a wall or corner. This can be defeated by setting it to 0 dB.
Note: These controls are only available on the active E4.5.