Inter-m PP-9214 Manuale utente
PP-9214
Preamplifier
Copyright 2004 Inter-M Corporation
PP-9214 Preamplifier
Contents
Welcome ..................................................................................................................................... 3
Unpacking ............................................................................................................................... 3
Warnings .................................................................................................................................. 3
Operation................................................................................................................................. 5
Features ....................................................................................................................................... 6
Front Panel Controls.................................................................................................................... 7
Connections.............................................................................................................................. 11
Block Diagram .......................................................................................................................... 12
Specifications............................................................................................................................ 13
2
PP-9214 Preamplifier
Welcome
A personal welcome to you from the management and employees of Inter-M
Thank you for purchasing this fine Inter-M product. All of us here at Inter-M are dedicated
to providing you with the highest quality products and the best value.
We sincerely trust this product will provide you with years of satisfactory service, but if
anything is not to your complete satisfaction, we will endeavor to make things right.
Welcome to Inter-M, and thank you for becoming a part of our worldwide extended
family!
Unpacking
Although your PP-9214 is neither complicated nor difficult to operate, we recommend
you take a few minutes to read this brief manual and familiarize yourself with the
important information regarding product features, setup and operation.
As with most electronic devices, we strongly recommend you retain the original
packaging. In the unlikely event the product must be returned for servicing, the original
packaging (or reasonable equivalent) is required.
Warnings
Environment
Never place this product in an environment that could alter its performance or reduce its
service life. Such environments are usually characterized by high levels of heat, dust,
moisture, or vibration.
Safety
1. Read these instructions carefully.
2. Follow all instructions.
3. Keep all warnings.
4. Do not operate this apparatus near water.
5. Clean only with a damp cloth.
6. Do not block any of the ventilation openings.
7. Install only in accordance with the instructions in this manual.
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PP-9214 Preamplifier
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other
devices (including amplifiers) that produce heat.
9. Do not defeat the safety purpose of the polarized or grounding type plug. A polarized
plug has two blades, with one wider than the other. A grounding type plug has two
blades and a third grounding prong. The wide blade or the third prong is provided for
your safety. If the provided plug does not fit into your outlet, consult an electrician for
replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched, particularly at plugs,
convenience receptacles, and the point where it is attached to the apparatus.
11. Use only the attachments/accessories specified.
12. Use only with a cart, stand, tripod, bracket, or table specified, or sold with the
apparatus. When a cart is used, use caution when moving the cart/apparatus
combination to avoid overturning.
13. Unplug this apparatus during lightning storms or when unused for long periods of
time.
14. Refer all servicing to qualified service personnel. Servicing is required when the
apparatus has been damaged in any way, such as power supply cord or plug is
damaged, liquid has been spilled or objects have fallen into the apparatus, the
apparatus has been exposed to rain or moisture, does not operate normally, or
has been dropped.
4
PP-9214 Preamplifier
Operation
Make certain that speakers and input sources are properly connected before switching
on.
Keep volume levels at minimum gain before switching on.
NOTE: The system’s operation is delayed by approximately three seconds after pressing
the AC Mains power switch. This is due to the built-in protection circuitry, designed to
protect speakers and other system components.
5
PP-9214 Preamplifier
PP-9214
Preamplifier
Features
Versatile and Compact
• Flexible mix architecture in a space-saving two RU package.
Twelve Inputs and Two Outputs
• Eight mono inputs and two stereo inputs, plus a stereo output.
Input and Output Metering
• Peak meters on input channels, plus multi-segment LED metering to monitor your
output signal.
Three-Band EQ
• Three-Band EQ control on output section
On-Board Phantom Power
• Built-in +18VDC phantom power for condenser microphones
AC or DC Operation
• Runs on 100-120VAC, 220-240VAC, or 24VDC for true portability.
6
PP-9214 Preamplifier
Front Panel Controls
1. Trim Controls 1-8
These knobs control the gain level for the associated input channel.
2. Channel Selector Switches 1-8
These buttons assign the channel’s input signal to one or both of the stereo
outputs.
3. Peak Indicators 1-8
These LED indicators light when the input signal to the associated channel is 3dB
below clipping. If the indicator is lit steadily, reduce the channel’s Trim level (1) to
avoid distortion.
4. Channel Output Levels 1-8
These knobs control the associated channel’s output level.
5. Gain Select Switches 9/10 – 11/12
These switches select the input gain level for Stereo Channels 9/10 and 11/12. You
may select between +4dB, -10dB or –20dB input level, depending on your input
source. If the signal is too weak (very low level), select a higher setting; if the
signal is too hot (overloaded and distorted), select a lower setting.
6. EQ Controls
These knobs control equalization for the stereo (master) output. Three bands of
equalization are provided:
Low: 80Hz, ±12dB, Shelving
Mid: 800Hz ±12dB, Shelving
High 8kHz ±12dB, Shelving
7
PP-9214 Preamplifier
7. Priority Level Control
This knob controls the volume of the input signal of the chime, siren, or other
audio source connected to the Priority Input jacks on the rear panel. When signal
is present at the Priority Input jacks, all other signals except Channel 1 are muted.
8. Main Output Level Controls
These sliders control the stereo (master) output level. The output level may be
monitored by the Output Level Meters (9).
9. Output Level Meters
These five-segment LED meters monitor the level of the stereo (master) output
signal.
10. Phantom Power Switch and Indicator
Pressing this switch activates the +18VDC phantom power supply to the Mic
Inputs 1-8, for use with condenser mics requiring external power. When Phantom
Power is active, the LED indicator lights. Push this switch again to switch off
Phantom Power.
11. Power Switch
Pressing this switch switches the unit on, as indicated by the Power LED in the
switch. Pressing it again switches the unit off.
8
PP-9214 Preamplifier
Rear Panel Controls
1. Mic Inputs 1-8
Mic-level inputs on balanced three-pin XLR connectors.
2. Line Inputs 2-8
Line-level inputs on balanced 1/4" phone connectors.
3. Line Inputs 9-12
Line-level inputs on unbalanced RCA and 1/4" phone connectors. These are
provided as two sets of stereo inputs (9/10 and 11/12).
4. Priority Input
These two unbalanced 1/4" line-level inputs are provided for priority connection
of chime/siren equipment. When input signal is present on these inputs, all other
audio inputs except Channel 1 are automatically muted.
5. Rec Output
These two unbalanced 1/4" line-level inputs are provided for connecting to an
external recording device.
6. Mute Switch
When this switch is pressed, priority muting is activated, and all signals except
Channel 1 and Priority Input are muted.
7. Inserts
These unbalanced 1/4" TRS jacks are provided for input of an audio source before
the master fader. The input signal is unaffected by the Channel Input levels.
9
PP-9214 Preamplifier
8. Main Outputs
These are balanced XLR output jacks for connecting to the input of a power
amp.
9. DC Input Terminals
These terminals are provided for the connection of backup battery. Connect a
24VDC battery source to these terminals. Make certain the red terminal is
connected to the battery’s positive (+) side, and the black terminal to the
battery’s negative (-) side.
10. AC Fuse Holder
This holder contains the AC overload protection fuse. If the fuse has blown out,
replace it with a fuse of the same type and rating. If the fuse continues to blow,
refer servicing to a qualified service technician.
11. AC Connector
Connect the supplied standard AC input cable here.
10
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