The LED light on the front-panel indicates if phantom power is present. In order to save battery it
will
not
light when the unit works on battery power only.
Battery Change:
To insert and change the battery, open the 2 screws on the sides of the unit, remove the lid,
connect a fresh 9 volt battery to the battery clip and place it in the marked compartment.
The unit is delivered without a battery.
Note: ALWAYS UNPLUG THE INPUT CABLE IN ORDER TO SWICH OFF THE BATTERY when
the unit is not in use!
How to adjust the sound with the preamp:
We recommend to start with all EQ controls turned down all the way and add frequencies to your
liking. Then listen to the two phase switch settings to get the best tone and the lowest feedback.
But first, please read the following paragraphs:
Adjustable Gain control:
Gain and volume do both have an effect on the output volume of the preamp but they accomplish
different tasks.
The gain (also called input gain or sensitivity control) controls the input signal level in the circuit in
the preamp. It sets the amount of pre-amplification before the signal enters the EQ section etc.
The volume control on the other hand is located at the end of the circuit and simply allows lowering
or shutting down the volume.
It is very important to properly set the gain control to fit the instrument you are using. An
instrument with a high volume will require less gain than one that is not as loud. Also a player who
strums hard will have to set the gain lower than one who picks the strings very lightly.
To set the gain correctly, you have to mount and connect your mic to the guitar and plug it into the
Meridian Pro Preamp.
Connect it to your amplification system and set the channel to
a low volume
setting for a start.
Begin with the gain on the preamp at about 12 o’clock center setting. The volume control on the
Meridian Pro Preamp
should be set to fully clockwise.
Play your instrument in your loudest dynamic range (play it as hard as you expect to play) and
slowly turn the gain up until distortion just occurs. Now back the gain off a little bit until the signal
is clear again. This is the correct gain setting for this instrument.
With the Meridian Microphone the gain will most likely end up somewhere between “half” and “full”.
Please keep in mind that excessive EQ boost applied after the initial gain setting procedure may
introduce distortion, in this case you have to reduce the gain a little bit.
Phase switch:
Phase switches are usually marketed as a feedback-controlling device, but they accomplish more
than just that.
What is phase? Phase determines at what point in time a soundwave has it’s peak or trough.
This picture shows 2 simple (identical) sine waves, but the wave on the bottom (2) is
inverted in respect to the wave on top (1). Interestingly, if these two waves were played back
simultaneously, they would completely cancel each other out and no sound would be heard.
Amplification systems and effect units may or may not invert the phase in respect to the signal
which is send in. In most cases the manufacturers do not specify.
Every acoustic instrument projects (acoustic) sound waves in a certain phase. The phase that is
projected from the amplified speaker source should be "in phase" (not inverted) with the acoustic
instrument's own soundwaves or the result will not be optimal. If the amp projects the inverted
phase, the acoustic instrument will fight its own amplified sound and no balanced tone can develop.
