Balancing Instrument Levels with the Red-Eye Twin Preamp:
It is important to set the sound level the same for both instruments so that, when
you switch instruments on stage, the apparent loudness of the instruments will be
compatible.
First, turn both A and B Gain controls about ¾ of full gain (When Gain is 3/4, the
Red-Eye Twin has the same gain profile as the single-channel Red-Eye Preamp.)
Second, compare the sound level each instrument makes. Use the A/B Stomp
Button to swap instruments and play them as you would during a gig.
Third, turn the Gain control for the loudest instrument down or turn the Gain
control for the softer instrument up to balance both instruments.
Fourth, adjust the Treble control for each instrument to suit your taste. Likely, the
Treble settings will be different for each instrument because of differences in the
pickups and differences in the instrument’s character.
Take note of the positions of the Gain and Treble controls so you can use the
same settings at your next gig without having to compare instruments again.
Overall gain level:
The gain controls for both Red-Eye Twin channels provide a lot of range, allowing
very different instruments to be balanced well. If the rare case arises that
instruments are being used that have exceptionally low or high signal levels, there
is an internal, overall, gain control on the circuit board inside the Red-Eye Twin that
can be adjusted with a small screwdriver. For normal ranges of gain the overall gain
control should be centered. Turning the overall gain control clockwise will increase
the Red-Eye Twin gain, and turning it counter-clockwise will reduce the gain.
Red-Eye Twin Preamp Signal Path:
The Instrument Input impedance varies with frequency and pickup type.
The Effects Loop Output impedance is less than 4,000 Ohms.
The Effects Loop Input impedance is 4,000 Ohms.
The XLR Output impedance is 600 Ohms.
Frequency response is flat from 10 Hz to 20K Hz when Treble Control is centered.
Boost level above no Boost: Minimum Boost: +2 db, Maximum Boost: +7 db
Noise Floor (hiss) is 118 db below 1V peak-peak input level.
Total Harmonic Distortion is less than 0
.
02% at 1V peak-peak input level.
High
Input Impedance
Amplifier A
Instrument A
Boost Level
Control and
Boost Button
A Treble and
Gain Controls
Output To
Effects or to PA
Input From
Effects
Balanced
XLR
Output
Isolation
Transformer
This connection
opens when the
Effects Loop Input
is used.
High
Input Impedance
Amplifier B
Instrument B
B Treble and
Gain Controls
A / B
Instrument
Select
