Fire-Eye RED-EYE INSTRUMENT PREAMPLIFIER Manuale utente
Red-Eye Instrument PreamplifierTM
The Red-Eye Instrument Preamp offers a simple direct-connect solution for musicians
playing instruments with high-impedance piezoelectric pickups. The Red-Eye Preamp
works well with instruments having passive or active piezo pickups or those with magnetic
pickups such as electric guitars and electric basses.
The Red-Eye Preamp’s impedance-matching field-effect transistor input circuit is designed
especially to match and track the impedance of passive piezoelectric pickups. That results
in a smooth, natural, balanced, acoustic instrument tone. Low distortion, low noise, and
generous headroom mean that clear tone comes through even when an instrument is
played percussively and loudly.
Features:
Input: Impedance-matching, accepts up to 2 volt peak-to-peak level without distortion.
Low-impedance, balanced, XLR output, 600 ohms with ground-lift switch,
Boost button with volume control for amplifying solos.
Treble control to boost or reduce treble. Response is flat when control is centered.
Usually powered by 48-volt XLR phantom power but has an internal 9-volt battery and a 9
to 18-volt center-negative, center-ground, power jack as alternatives.
Long 9-volt battery life (~200 hours). Battery is not used if other power is present.
Plugging an instrument in or connecting external power turns the Red-Eye on.
Pwr Chk Light illuminates for about a second if power is good when the preamp is
powered up. When powered up on the battery, the light will appear if the battery is in the
first ¾ of its life.
¼ inch output and input for effects accessory loop, suitable for stomp-tuners or effects
pedals or for output to on-stage guitar amps or PAs.
Internal filtering to reject radio-frequency interference from neon lights and cell phones.
Small Chassis Size: 1.25 x 2.25 x 4.25 inches. Weight: 10 ounces.
XLR
Output
to
Sound
System
Boost
Button
¼-inch
Output to
Accessories
¼-inch Input
from
Accessories
Boost
Volume
Control
¼-inch
Instrument Input
Power Chk
Light
Treble
Control
Red-Eye
Instrument Preamplifier
www.fire-eye.com
Boost
Balanced
Output
Instrument
Boost Light
9-18V
Power Jack
Ground Lift
Switch
Effects
9-18V
Effects
Gnd
Lift
Treble
Red-Eye Preamp Signal Path:
The Instrument Input impedance varies with frequency and pickup type.
The Effects Output impedance is 2,000 to 4,000 ohms depending on Boost settings.
The Effects Input impedance is 4,000 ohms.
The XLR Output impedance is 600 ohms.
Frequency response is flat from 10 Hz to 20 KHz when Treble Control is centered.
Boost level above no Boost: Minimum Boost: +2 db, Maximum Boost: +7 db
Noise Floor (hiss) is 130 db below 1V peak-peak input level.
Total Harmonic Distortion is less than 0.05% at 1V peak-peak input level.
Using the Red-Eye Preamp to simply connect your instrument to a club’s sound system:
You have control over your instrument’s treble.
You have control over solo boost if you need it.
If you turn on a Stomp-Tuner, the XLR output to the Mix Board will be muted.
Red-Eye Preamp
Effects Loop
Output Input
Instrument
XLR Cable
to Mix Board
Input Output
Stomp-Tuner
(optional)
High Input
Impedance
Amplifier
Instrument
Boost Level
Control and
Boost Button
Treble
Control
Output To
Effects or to PA
Input From
Effects
Balanced
XLR
Output
Isolation
Transformer
This connection
opens when the
Effects Loop Input
is used.
Using several effects pedals or a pedal board with the Red-Eye Preamp:
Connect Effects 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 Preamp with an on-stage Guitar Amp or Instrument PA:
Add any effects boxes you want in series between the Red-Eye Preamp and the
PA.
Red-Eye Preamp works to control the instrument’s treble and gives you a solo
boost button.
Using the Red-Eye Preamp as a passive Direct Interface:
The Red-Eye can also be used as a high-quality passive direct box. The isolation
transformer used in the Red-Eye 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
Red-Eye Preamp
Effects Loop
Output Input
Single-Ended
Quarter-Inch Cable
XLR Cable
to Mix Board
Red-Eye Preamp
Effects Loop
Output Input
Instrument
Input
Guitar Amp
or other PA
Red-Eye Preamp
Effects Loop
Output Input
Instrument
XLR Cable
to Mix Board
Input Output
Effect #2
Input Output
Stomp-Tuner
Input Output
Effect #1
Indice
