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Dee-Eye Instrument PreamplifierTM
The Dee-Eye Instrument Preamp offers a simple solution for connecting instruments with high-impedance
piezoelectric pickups to a venue’s sound system. Any passive or active instrument pickup is supported.
The Dee-Eye Preamp’s high input-impedance allows piezoelectric pickups to operate essentially unloaded,
which results in a smooth, natural, acoustic instrument tone. Low distortion, low noise, and generous
headroom mean clear tone comes through even when an instrument is played percussively and loudly.
The Dee-Eye Preamp also works well with instruments that have active pickups or magnetic pickups, such
as electric guitars and electric basses.
Features…
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Input: high-impedance, 1 million ohms, accepts up to 12 volts peak-to-peak input level without
distortion.
Low-impedance, balanced, XLR output, 600 ohms, will drive long cables to a mix-board.
Requires 48-volt XLR Phantom Power.
Power OK Light is on when preamp is properly powered up.
¼ inch output and input for accessory loop, suitable for stomp-tuners or effects boxes or for output
to on-stage guitar amps or PAs.
Internal filtering to reject radio-frequency interference from neon lights and cell phones.
Small Size: 1.25 x 1.5 x 3.75 inches. Weight: 6 ounces.
¼-inch Instrument
Input
Power OK Light
Instrument
Input
Pwr OK
Dee-Eye
Instrument Preamplifier
www.fire-eye.com
Balanced
Output
Effects
Loop
XLR Output to
Sound System
¼-inch Input from
Accessories
¼-inch Output to
Accessories
Dee-Eye Preamplifier Signal Path…
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The Instrument Input impedance is 1,000,000 ohms.
The Effects Loop Output impedance is 600 ohms.
The Effects Loop Input impedance is 4,000 ohms.
The XLR Output Impedance is 600 ohms.
Frequency response is flat +/- 1 db from 10 Hz to 20K Hz.
Noise Floor is 136 db below 10-volt peak-to-peak input level
Total Harmonic Distortion is less than 0.05% at 10V peak-peak input level.
Output to
Effects or to PA
Instrument
Input From
Effects
High
Input Impedance
Amplifier
Isolation
Transformer
Balanced
XLR
Output
This connection
opens when the
Effects Loop Input
is used.
Using the Dee-Eye Preamp to connect your instrument to a club’s sound system…
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Stomp Tuner is optional.
When you turn on the Stomp-Tuner, the XLR output to the Mix Board will be muted.
Dee-Eye Preamp
Instrument
Effects Loop
Output
Input
Input
Output
Stomp-Tuner
(optional)
XLR Cable
to Mix Board
Using several effects boxes or a pedal board with the Dee-Eye Preamp…
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Connect Effects Boxes and/or a Stomp-Tuner in series to the Dee-Eye Preamp Effects Loop.
Effect Boxes and/or Stomp-Tuner will affect the XLR output to the Mix Board.
Dee-Eye Preamp
XLR Cable
to Mix Board
Instrument
Effects Loop
Output
Input
Input
Output
Stomp-Tuner
Input
Output
Input
Effect #1
Output
Effect #2
Using the Dee-Eye Preamp with an on-stage Guitar Amp or Instrument PA…
 Add any effects boxes you want in series between the Dee-Eye Preamp and the PA.
 An XLR cable must be connected to supply 48-volt Phantom Power
Dee-Eye Preamp
Instrument
Effects Loop
Output
Input
Input
Guitar Amp
or other PA
Using the Dee-Eye Preamp as a passive DI…
 The Dee-Eye can also be used as a high-quality passive direct box. The isolation transformer used
in the Dee-Eye Preamp has a nearly linear response from 10 Hz to over 30 KHz.
 Phantom Power is not required.
 4,000 ohm input-impedance, single-ended input
 600 ohm output-impedance, balanced output
Dee-Eye Preamp
XLR Cable
to Mix Board
Effects Loop
Output
Input
Single-Ended
Quarter-Inch Cable
Dee-Eye Frequency Response
1
dbV @ OUT / dB
0.5
0
-0.5
-1
-1.5
-2
-2.5
20
50
100
200
500
1k
2k
5k
10k
20k
Frequency / Hertz
For additional information, contact…
Fire-Eye Development: www.fire-eye.com
Fire-Eye Development: 512-346-6944
Justin Jacobs: [email protected]
Daren Appelt: [email protected]
Dee-Eye Instrument Preamplifier is a trademark of Fire-Eye Development, Inc.