Mixer/Amplifier GPX 2500
®
Operation Manual
axxent e.K. · Technologiezentrum Herzbachtal · Zum Wartturm 15 · 63571 Gelnhausen (Germany)
4 5 6 7 8 9 10
Each of the three front inputs provides a 3 band equalizer
(4), "LOW, MID and HIGH" and a volume level control (5).
Located right from the volume controls is the 5 position
source select switch (6) (SELECT). With this rotary knob
you easily can select any of the 5 RCA stereo inputs on the
rear side of the mixer, labelled AUX1 to AUX5. Typically
these inputs are used to connect CD/MP3 player, cassette
player, tuner or similar devices. Right of the source selector
knob you will nd the volume control (7) for the selected
source.
In the middle of the front panel you surely will see the
protection plate, covering the 7 band equalizer. Reason for
this cover plate is to protect the equalizer settings made
by an acoustic engineer after
calibrating the complete system.
If you may want to make your
own sound adjustments, and no
calibration settings by an acous-
tical expert must be protected
against unwanted changes, feel
free to remove this metal cover
plate. The gain range of the
equalizer is limited to ± 6 dB
by intention in order to avoid
extreme setting which may result in an unwanted "twisted"
frequency response and also may cause damage to the
system or components.
On the right hand side of the GPX-2500 you will see the
output volume controls, one for the "MASTER" (9), the main
stereo output, and two smaller control knobs (8) for adjust-
ing the level of the two mono zones. For example the
stereo main output may be used in a pub or bistro to drive
the main loudspeakers, a zone output for the washrooms/
hallways and another one for separate smaller room. The
balanced XLR output jacks for the mentioned dierent
PA areas are located on the rear side. Above the "MASTER"
volume control you see a row of three LED indicators (10)
for power on, signal presence and for the limiter activity.
Limiter: Located on the right bottom side of the front
panel you see two recessed controls for the limiter, one is
the on/o switch and the upper is the screwdriver adjust-
able setting for the limiter attenuation level. The limiter is
an important tool to keep the sound pressure level (SPL)
within a prexed maximum, for example
if government rules do not allow SPLs
above a certain maximum level. With
this limiter you can rest assured that this
maximum level is not exceeded–and
you even can have this maximum level
measured and calibrated by an acoustic
engineer and have it ocially sealed.
The output level of the GPX-2500 may
be attenuated up to 30 dB. Last not least above the limiter
section you may have already noticed the "POWER" switch.
No further explanation necessary here...
