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 will stay consistent.

• First, turn both A and B Gain controls straight up (centered).  (When Gain is centered, 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 or guitar pick.  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 is 1,000,000 Ohms.
• 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 20 KHz (+/- 1 dB) when Treble Control is centered.
• Boost level above no Boost:  Minimum Boost = +3 db, Maximum Boost = + 7 db

 

Using the Red-Eye Twin Preamp to simply connect your instruments to a club's sound system:

• You have control over each instrument's treble and gain.
• You have control over solo boost if you need it.
• Stomp Tuner is optional.
• When you turn on the Stomp-Tuner, the XLR output to the Mix Board will be muted.
   

Using several effects boxes or a pedal board with the Red-Eye Twin Preamp:

• Connect Effects Boxes and/or a Stomp-Tuner in series to the Red-Eye Preamp Effects Loop.
• Effect Boxes and/or Stomp-Tuner will affect the XLR output to the Mix Board.

 

Using the Red-Eye Twin Preamp with an on-stage Guitar Amp or Instrument PA:

• Red-Eye Preamp works to control the instrument's treble and gives you a solo boost button.
• Add any effects boxes you want in series between the Red-Eye Preamp and the PA.
   

Using the Red-Eye Twin Preamp to convert a Single-Ended signal to XLR Balanced Output:

• The Red-Eye Twin can also be used as a high-quality passive direct box.  The isolation transformer used in the Red-Eye Twin Preamp has a nearly linear response from 18 Hz to over 30 KHz.
• Power is not required.
• 4,000 ohm input-impedance, single-ended input
• 600 ohm output-impedance, balanced output