Protech 5126 User Manual
OUTPUT CONFIGURATIONS
Place Red Push-On Jumpers On Desired Configuration Pins.
Units are shipped from factory with all outputs in “A1 & A2” configuration.
PROTECH
1/06
®
INSTALLATION & OPERATION
MANUAL
AUDIO DISTRIBUTION AMPLIFIERS
All Inputs and Outputs Individually Adjustable.
MODELS COVERED
5126
5126T
5226
5226T
Notes:
Output 3
Output 2
Output 1
6
5
4
- Page 4 -
A1
A2
A1 & A2
Electronic or Transformer Balanced Inputs and Outputs.
The Models 5126, 5126T, 5226, 5226T audio
distribution amplifiers are designed for use
in professional audio systems.
The application of the ADA's is found in public
address systems, communication systems, background music systems, recording systems. and
broadcast systems.
Each of the four models offers two (2) inputs
and six (6) output configurations. The 5226 and
5226T offer two identical 2x6 sections.
The Models 5126 and 5226 have state-of-the-art
electronically balanced inputs and outputs. The
5126T and 5226T have transformer isolated
inputs and outputs.
The #1 input gain stage on all four models is
adjustable from -15 to 20dB of gain. The input two
gain stage is adjustable from 0 to 20 dB of gain.
This input serves as a reference level for unity
gain, when turned completely down. Each of the
outputs has independently adjustable gain, from
infinity to 20dB of gain. Adjusting the input stage
level will effect all of the output level settings
in that section. The 20dB of gain available
at the input stage should be used before the gain
of the output section is utilized.
Each output may be strapped, via an internal
push-on jumper, to provide the input 1 signal, or,
the input two signal, or, the sum of input 1 and
2. As shipped from the factory, all outputs are
strapped to provide both the 1 and two inputs.
The power supply section of all four models has
been designed to achieve the lowest possible
noise and hum specifications. The AC transformer
is a UL recognized wall mount unit. Designing
the transformer in this manner eliminates the AC
field inside the chassis, and results in greatly
improved noise and hum figures.
The power supply section also includes a rear
mounted fuseholder, a front mounted power on
indicator (green L ED ), an d a g ro und lift sw itch.
The switch is used to disconnect the audio
amplifier ground from earth ground, if
necessary. In almost all systems, the units w ill
achieve best results with the ground lift switch
in the ON position.
Each of the four models requires only a single
unit of vertical rack space. The choice of single
or dual units provides extreme circuit density in
a minimum of rack space.
Protech Audio Corporation PO Box 597, 192 Cedar River Road Indian Lake New York 12842 Voice 518-648-6410 Fax 518-648-6395
INSTALLATION
The Toolbox Series Audio Distribution Amplifiers from
Protech Audio are designed to be mounted in a standard 19
inch wide EIA rack. Each of the four models requires 1.75
inches of vertical rack space. The steps for installing
the units are as follows;
If the installation requires that some or all outputs do not need
the signal from both inputs 1 & 2, remove the 8 cover screws and
move the jumpers to the appropriate position (See page 4).
Mount unit in rack, using four machine screws of sufficient
tensile strength to support unit properly.
Terminate all audio inputs and outputs, using double conductor
shielded cable, as shown on facing page. The diagram on the
facing page shows balanced line configurations. For unbalanced lines terminate line HI to DA HI, and line LO to DA SH
connection;
UNBALANCED INPUT
CONNECTION
HI
LO
SH
BALANCED INPUT
CONNECTION
HI
LO
SH
UNBALANCED OUTPUT
CONNECTION (Electronic)
The wall mount power transformer plugs into the rear power
connector marked 16VAC. Plug transformer jack into chassis
connector first. Then plug wall transformer into three prong AC
outlet.
20 VAC
1 AMP
SLO-BLO
Make sure ground lift switch is in the on position.
Check front panel power indicator (green LED) for proper
illumination.
GROUND
LIFT
ON
OFF
ALIGNMENT
All four models have been shipped from the factory adjusted
for unity gain. Input 1 is adjustable from -15 to +15dB of
gain. Input 2 is adjustable from 0 to 15dB of gain, and serves
a s a r e fe r ence l evel f o r u n i ty g a i n , when t u r ned completely
down.
PROTECH AUDIO
OUTPUT SECTION A
OUTPUTS
6
LO HI
6
LO HI
SH LO HI LO HI SH LO HI LO HI SH LO HI
SH LO HI LO HI SH LO HI LO HI SH LO HI LO HI SH LO HI
45
OUTPUT SECTION B
OUTPUTS
45
®
MODELS 5126, 5226, 5126T, 5226T
CONNECTOR & LAYOUT DRAWING
3
3
21
21
TOOLBOX SERIES
INPUTS
21
LO HI SH LO HI
INPUTS
2
1
HI
LO
SH
UNBALANCED OUTPUT
CONNECTION (Transformer)
HI
LO
SH
BALANCED OUTPUT
CONNECTION
HI
LO
SH
CAUTION: DO NOT USE THE 20dB OF GAIN IN T HE
OUTPUT STAGES UNTIL THE GAIN IN THE INPUT
STAGE IS COMPLETELY EXHAUSTED. DOING SO WILL
RESULT IN REDUCED SIGNAL - TO NOISE RATION.
Each output trimpot i s i n di v i d ua l l y ad j u s ta b l e fr om i n f in it y
(completely off) to 20dB of gain. The output gain trimpot
should not be used to adjust the output setting until the gain
at the inputs has been exhausted.
Adjusting the individual output gain trimpot will not effect
the any other output level setting.
Page 2
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POWER
SUPPLY
OUTPUT CONTROLS
SECTION B
OUTPUT SECTION A
FRONT VIEW
OUTPUT CONTROLS
SECTION A
REAR VIEW
POWER ON
INDICATOR
OUTPUT SECTION B
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