Symetrix 302 User manual

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6408 216th St. SW | Mountlake Terrace, WA 98043 | USA | Tel: [phone] | Fax: [phone] | Web: www.SymetrixAudio.com
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PHANTOM
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EMI
FILT ER
CIRCUI TRY
15 dB
PAD
CIRCUI TRY
POLA RITY
REVERSA L
CIRCUI TRY
MIC
PREA MP
CIRCUI TRY
GAIN CL IP
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CIRCUI TRY
GAIN
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This dual microphone preamplifier delivers substantial sonic improve-
ments over stock mixers or console
preamps: solid stereo imaging, excellent
transient response, very low noise, and
almost undetectable distortion. Start your
mix off right with the 302 Dual Micro-
phone Preamplifier from Symetrix, the
engineering-driven company of signal
processing specialists.
302 Features
7Half rack space, two (2) channel analog mi-
crophone preamp. Applications: Broadcast,
Sound Reinforcement, Digital and Analog
Recording, Podcasting.
7Solid stereo imaging, excellent transient
response, very low noise floor, and almost
undetectable distortion.
7Variable input gain from 20-60 dB.
7Polarity reverse switch, 15 dB pad switch.
7+48 Volt phantom power.
The 302 Dual Microphone Preamp from Symetrix. 302 Block Diagram
[Pictured actual size]

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6408 216th St. SW | Mountlake Terrace, WA 98043 | USA | Tel: [phone] | Fax: [phone] | Web: www.SymetrixAudio.com
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Architects and Engineers
Specifcations
The microphone preamp shall be a high performance, dual channel,
unit that is of a single half rack space wide and one rack space high.
The unit shall provide two independent channels of pre-amplification
designed to boost nominally mic level signals to line level. Each
channel shall have a gain control that is continuously variable from 20
dB to 60 dB of gain, a 15 dB input pad, a polarity reversal switch, and
an LED indicator that lights in the presence of signal peaks. There shall
also be a front panel pushbutton switch to engage phantom power,
and an LED that indicates the presence of AC power. The following
connections shall be available on the rear panel. Each channel shall
have an XLR3 mic input (wired pin 1 = ground, pin 2 = +, pin 3 = -), a
TRS line level output, and a Euroblock-style removable terminal strip
line level output. There shall also be a mix output that provides a sum
of channels 1 and 2 via a Euroblock-style removable terminal strip. The
unit shall be capable of operating by means of a Symetrix PS-3 or PS-
3E external power supply connected to 115 VAC nominal (95 to 130 VAC),
50/60 Hz or 230 VAC nominal (207 to 253 VAC), 50 Hz where applicable.
The microphone preamp shall be the Symetrix Inc. model 302 Dual
Microphone Preamplifier.
© 2007, Symetrix, Inc. All rights reserved. In the interest of continuous product improvement, features and specifications are subject to change without notice.
Specifcations
Input/Output
Input Type: Low Z Transformer
Maximum Input Level: +14 dBV (with pad “In”)
Maximum Output Level: +24 dBu Balanced, 10k Ωload
+22 dBu Balanced, 600 Ωload
Input Impedance: >3k Ω
Output Impedance: 300 ΩBalanced, 150 ΩUnbalanced
Performance Data
Clip Indicators: Red LEDs, fire 3 dB below clipping
Frequency Response: 20 Hz to 20 kHz, +0, –1 dB
THD+Noise: 0.007% (1 kHz, 0 dBu, 600 Ωout);
0.01% (1 kHz, +22 dBu, 600 Ωout)
Signal to Noise Ratio: 95 dB (-50 dBV, 150 Ωin)
EIN < -128 dBu (150 Ωsource, 60 dB gain, 22 kHz bandwidth)
Phantom Power: +48V
Minimum Gain: 20 dB
Maximum Gain: 60 dB
Connections
Input: XLR
Output: 1/4”TRS jacks, Euroblock
Power In: 7-pin DIN
Physical
Size: (HxWxD) 1/2 rack unit,
1.75 in. x 8.5 in. x 6.5 in. (4.45 cm x 21.59 cm x 15.88 cm)
Shipping Weight: 4.6 lbs. / 2.09 kg
Electrical
Power Requirements:
115 VAC nominal, 95 to 130 VAC, 50 to 60 Hz, 10 Watts
230 VAC nominal, 207 to 253 VAC, 50 Hz, 10 Watts
Environment
Maximum operating ambient temperature: 30° C.
[Pictured actual size]