SM Pro Audio
SM Pro Audio
VALUE SERIES
Operating Manual - SM PR4 V
Version 1.0 November 2002
SAFETY INSTRUCTIONS
CAUTION: To reduce the risk of electrical shock, do not remove the cover or rear panel of this
unit. No user serviceable parts inside. Please refer servicing to qualified personnel only.
WARNING: To reduce the risk of fire or electrical shock do not expose this appliance to rain or
moisture.
DETAILED SAFETY INSTRUCTIONS:
All safety and operation instructions of this manual should be read and adhered to before
operation.
Retain Instructions:
Please retain all safety and operating instructions for future reference.
Follow instructions:
All operation and user instructions should be followed.
Water, liquid and Moisture:
The appliance should not be used near water, rain or other liquids. Make sure that no liquid can
leak, spill or otherwise seep into the appliance.
Ventilation:
Please place the appliance so no obstacles interfere or impede the flow of air through the
ventilation openings.
Heat:
The appliance should be situated away from other heat sources such as heaters, radiators,
ovens, or other appliances that produce heat.
Power Source:
Make sure your appliance is set to the correct voltage for the country in which it will be used.
Grounding and Polarization:
Precautions should be taken so that the grounding or polarization means of an appliance is not
defeated.
Power-Cord Protection:
Power supply cords should be routed so that they are not likely to be walked on, pinched, damaged, worn, or rubbed by any other device or obstacle.
Cleaning:
The appliance should be cleaned only with a light soft cloth. Do not use any damaging or
corrosive products on the unit.
Periods of inactivity:
The power cord of the appliance should be unplugged from the outlet when left unused for a long
period of time.
Damage Requiring Service:
The appliance should be serviced by qualified service personnel when:
- The power supply cord or the plug has been damaged; or
- Objects have fallen, or liquid has been spilled into the appliance; or
- The appliance has been exposed to rain; or
- The appliance does not appear to operate normally or exhibits a marked change in
performance; or
- The appliance has been dropped, or the enclosure damaged.
Servicing:
The user should not attempt to service the appliance beyond that is described in the Operating
Instructions.
All other servicing should be referred to qualified service personnel.
SM PR4 Main Features
Professional, multi-purpose multi-channel pre-amplifier system for studio applications
- Four totally independent pre-amplifiers in 1 RU package
- High quality audio
- 4 x balanced inputs
- 4 x unbalanced outputs
- Phantom On/Off per 2 channels
- 4 x peak Light indicators
- Individual gain control on each channel
- High-quality components and rugged construction
FOREWORD
Dear Customer,
Thank you very much for expressing your confidence in SM Pro Audio products by purchasing
this unit. The SM PR4 has been designed to be used as a standard tool for home/pro studios.
With much experience in the audio industry over a long period of time, and along with valuable
suggestions from our customers, our engineers have developed a product we know you will be
satisfied with. We guarantee you uncompromising quality (manufactured under ISO9000 certified
management system) as well as excellent technical and audio properties at an extremely
affordable price.
Regards,
SM Pro Audio
TABLE OF CONTENTS
1. INTRODUCTION
2. THE DESIGN CONCEPT
2.1 High quality components and design
2.2 Inputs and outputs
3. INSTALLATION
3.1 Rack mounting
3.2 Mains voltage
3.3 Audio connections
4. FRONT PANEL CONTROLS
4.1 Independent (4 x) rotary pre-amplifier gain controls
4.2 phantom power switches
5. APPLICATION
5.1 Using the SM PR4
6. SPECIFICATIONS
7. WARRANTY
1. INTRODUCTION
In purchasing the new SM PR4, you have acquired a multi-channel pre-amplifier of high class
that meets many of the demands of the home/pro studio.
The market size for digital audio interfaces and computer based digital editing has increased in a
massive way. With systems available at very low prices, more and more users are utilizing this
technology. One of the main problems with many of these systems is the input stage only
consisting of unbalanced line inputs or very low (or no mic pre) gain structure for the balanced
input stage and the unavailability of Phantom power.
The PR4 comes to the rescue with 4 channels of balanced input, with a full range of gain control
from -20dB to +40dB and Phantom power for every channel. This half rack unit can now solve
many of the connectivity issues which are raised in a large range of situations, whether in the
Studio, home, club installation or other live sound applications.
2. THE DESIGN CONCEPT
2.1 High quality components and design
The philosophy behind SM Pro Audio products guarantees a no-compromise circuit design and
employs the best choice of components. The operational amplifiers NJM4558D which are used in
the SM PR4, are exceptional. They boast extreme linearity and very low distortion characteristics.
2.2 Inputs and outputs
All inputs and controls are secured firmly to the exterior chassis housing. This ensures robust
quality and confidence in performance under all conditions.
3. INSTALLATION
Your SM Pro Audio SM PR4 was carefully packed in the factory and the packaging was designed
to protect the unit from rough handling. Nevertheless, we recommend that you carefully examine
the packaging and its contents for any signs of physical damage, which may have occurred in
transit.
+ If the unit is damaged, please do not return it to us, but notify your dealer and the shipping
company immediately, otherwise claims for damage or replacement may not be granted.
Shipping claims must be made by the consignee.
3.1 Rack Mounting
The SM Pro Audio SM PR4 fits into one half standard 19" rack unit of space (1 3/4"). Be sure that
there is enough air space around the unit for cooling. As to avoid overheating, please do not
place the SM PR4 on high temperature devices such as power amplifiers.
3.2 Mains voltage
The SM PR4 has a professional external 16v AC power supply. Before you connect your SM PR4
to the mains, please make sure that your local voltage matches the voltage required by the unit!
3.3 Audio connections
Analog inputs - On the front of the SM PR4 there are 4 x balanced XLR audio connections.
Analog outputs - On the front of the SM PR4 there are 4 x TRS balanced output jacks
4. CONTROLS
SM PR8 front panel
The SM PR4 has four independent pre-amplifiers channels. The unit provides variable rotary
gain controls, phantom power and peak indicator lights per channel.
4.1 The front panel rotary gain controls
Each channel features a rotary gain control for variable adjustment of the desired pre-amplifier
level.
4.2 The Back panel phantom power switches
Each channel features a phantom power supply for enabling the supply of 48v through the XLR
input connector to power condenser microphones. Each Switch controls 2 channlels.
5. APPLICATION
5.1 Using the SM PR4
It could not be simpler to use and operate the SM PR4. Each of the four pre-amplifier channels
has its own input and output and variable gain control.
Three steps:
1. Simply connect a signal for processing to one of the XLR balanced inputs on the front of
the SM PR4.
2. Make a connection from the corresponding channel output on the front of the SM PR4 to
your desired destination (Mixer, recorder, etc).
3. Adjust the variable gain control to the desired pre-amplified level. To ensure sure you do
not over pre-amplify your signal a peak clip indicator light has been provided on the front
panel of the SM PR4 for each channel. When illuminated, this light indicates that the preamplifier is overloaded and that distortion will occur. Please turn down the variable gain
control for the currently selected channel until the peak clip light is no longer illuminated.
Always trust your ears, the Peak LED is after the gain control so you could actually distort the
input with a very high level.
6. SPECIFICATIONS
AUDIO INPUTS & PRE AMPS
Connectors XLR
Type balanced
Impedance 2k Ohms
Min Sensitivity -40dB
Peak input level +5dB
Gain control range 50dB
Peak amplification 74dB
Phantom power +48V, switchable
AUDIO OUTPUTS
Connectors 1/4" jack
Type TRS balanced
Impedance -10dB 47K
Peak output level +18.5dB
DIST, FREQ, S/N RATIO & CROSSTALK
Frequency response 20Hz~20kHz, 0dB~-2B
Distortion 0.02%
S/N Ratio better than 80dB
Crosstalk rejection >70dB@1kHz;-20dBinput
POWER SUPPLY
Mains voltages USA/Canada ~ 120 V AC, 60 Hz
U.K./Australia ~ 240 V AC, 50 Hz
Europe ~ 230 V AC, 50 Hz
General export model ~ 100-120 V AC, ~ 200-240 V AC, 50-60 Hz
Power consumption 8.5VA
Fuse 100-120 V AC: 630 mA (slow-blow)
200-240 V AC: 315 mA (slow-blow)
Mains connection External power supply connector
PHYSICAL
Dimension 1 3/4" (44.5 mm) * 19" (482.6 mm) * 8 1/2" (217 mm)
Net weight approx. 3.4 kg
SM Pro Audio is constantly striving to maintain the highest professional standards. As a result of
these efforts, modifications may be made from time to time to existing products without prior
notice. Specifications and appearance may differ from those listed or shown.
7. WARRANTY
1 WARRANTY CARD
To be protected by this warranty, the buyer must complete and return the enclosed warranty card
(signed/stamped by retail dealer) within 14 days of the date of purchase to SM Pro Audio (see
address below 3). Failure to return the card in due time (date as per postmark) will void any
extended warranty claims.
2 WARRANTY
1. SM ProAudio warrants the mechanical and electronic components of this product to be free of
defects in material and workmanship for a period of one (3) years from the original date of
purchase, in accordance with the warranty regulations described below. If any defects occur
within the specified warranty period that are not caused by normal wear or inappropriate use, SM
Pro Audio shall, at its sole discretion, either repair or replace the product.
2. If the warranty claim proves to be justified, the product will be returned freight prepaid by SM
Pro Audio within Australia. Outside of Australia, the product will be returned at the buyer's
expense.
3. Warranty claims other than those indicated above are expressly excluded.
3 RETURN AUTHORIZATION NUMBER
1. To obtain warranty service, the buyer must call SM Pro Audio during normal business hours
BEFORE returning the product (Tel.: +61 3 9555 8081). All inquiries must be accompanied by a
description of the problem. SM ProAudio will then issue a return authorization number.
2. The product must be returned in its original shipping carton, together with the return
authorization number, to the following address:
SM Pro Audio
Service Department
W25, 26-28 Roberna St
Moorabbin
Melbourne, Victoria
Australia 3189
4 WARRANTY REGULATIONS
1. Warranty services will be furnished only if the product is accompanied by an original retail
dealer's invoice. Any product deemed eligible for repair or replacement by SM Pro Audio under
the terms of this warranty will be repaired or replaced within 30 days of receipt of the product at
SM Pro Audio.
2. If the product needs to be modified or adapted in order to comply with applicable technical or
safety standards on a national or local level, in any country which is not the country for which the
product was originally developed and manufactured, this modification/adaptation shall not be
considered a defect in materials or workmanship.
The warranty does not cover any such modification/adaptation, irrespective of whether it was
carried out properly or not. Under the terms of this warranty, SM Pro Audio shall not be held
responsible for any cost resulting from such a modification/adaptation.
3. Free inspections, maintenance/repair work and replacement of parts are expressly excluded
from this warranty, in particular if caused by inappropriate use. Likewise, the warranty does not
cover defects of expendable parts caused by normal wear of the product. Expendable parts are
typically pots, potentiometers, switches and similar components.
4. Damages/defects caused by the following conditions are not covered by this warranty:
- Misuse, neglect or failure to operate the unit in compliance with the instructions given in the
user or service manuals.
- Connection or operation of the unit in any way that does not comply with the technical or safety
regulations applicable in the country where the product is used.
- Damages/defects that are caused by any other condition beyond the control of SM Pro Audio.
5. Any repair carried out by unauthorized personnel will void the warranty.
6. Products which do not meet the terms of this warranty will be repaired exclusively at the
buyer's expense. SM Pro Audio will inform the buyer of any such circumstance. If the buyer fails
to submit a written repair order within 4 weeks after notification, SM Pro Audio will return the unit
C.O.D. with a separate invoice for freight and packing. Such cost will also be invoiced separately
when the buyer has sent in a written repair order.
5 WARRANTY TRANSFERABILITY
This warranty is extended exclusively to the original buyer (customer of retail dealer) and is not
transferable to anyone who may subsequently purchase this product. No other person (retail
dealer, etc.) shall be entitled to give any warranty promise on behalf of SM Pro Audio.
6 CLAIM FOR DAMAGES
Failure of SM Pro Audio to provide proper warranty service shall not entitle the buyer to claim
(consequential) damages. In no event shall the liability of SM Pro Audio exceed the invoiced
value of the product.
7 OTHER WARRANTY RIGHTS
This warranty does not exclude or limit the buyer's statutory rights provided by national law, in
particular, any such rights against the seller that arise from a legally effective purchase contract.
The information contained in this manual is subject to change without notice. No part of this
manual may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording of any kind, for any purpose, without the express written permission of SM Pro Audio.
ALL RIGHTS RESERVED © 2002 SM Pro Audio
SM Pro Audio
Service Department
W25, 26-28 Roberna St
Moorabbin
Melbourne, Victoria
Australia 3189
PH: +61 3 9555 8081
FAX: +61 3 9555 8083
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