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CVA50MX-1
CVA50PMX-1
Owner’s Manual
August 2013
Important Safety Instructions
Before using your Stewart Audio Inc. Power Amplier, please read this
Owner’s Manual carefully to ensure optimum trouble-free performance.
WARNING: TO REDUCE THE RISK OF ELECTRICAL SHOCK, DO NOT EX-
POSE THIS AMPLIFIER TO RAIN OR MOISTURE. DANGEROUS HIGH
VOLTAGES ARE PRESENT INSIDE THE ENCLOSURE. DO NOT OPEN THE
CABINET. REFER SERVICING TO QUALIFIED PERSONNEL ONLY.
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER (OR BACK). NO USER-
SERVICEABLE PARTS INSIDE. REFER SERVICING TO
QUALIFIED SERVICE PERSONNEL.
The lighting bolt within arrowhead symbol, within an
equilateral triangle, is intended to alert the user to the
presence of un-insulated “dangerous voltage” within
the product’s enclosure that may be of sufcient magnitude to constitute a risk of electrical shock to person.
The exclamation point within an equilateral triangle, is
intended to alert the user to the presence of important
operating and maintenance (servicing) instruction in the
literature accompanying the appliance.
Important Safety Instruction – Please Read Prior to Product
Installation.
1. Installation should be performed by a trained and licensed professional to
insure safe and lasting operation.
2. All of the safety and operating instructions should be read before the amplier is installed or operated. Retain these instructions for future reference. All instructions should be followed; all warnings on the amplier
and in the operating instructions should be adhered to.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
www.stewartaudio.com
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3. The amplier should be situated so that its location and position does not
interfere with its proper ventilation. For example, the amplier must not
be placed on a rug, bed, sofa or similar surface that impedes airow
across the chassis. Airow through the ventilation openings should be
unobstructed.
4. This amplier should not be used near water, for example, near a bathtub,
in a wet basement, near a swimming pool, etc. This amplier is intended
to be operated in a controlled indoor environment.
5. Do not place the amplier near heat sources such as radiators, heat registers, stoves, or other appliances that produce heat.
6. The amplier should only be connected to 120 VAC, 60 Hz power supply.
Do not defeat the ground or polarization of the power plug.
7. Route power cord and other cables so that they are not likely to be
walked on, tripped over or stressed. Pay particular attention to condition
of cords and cables at plugs and at the point where they exit the amplier. To prevent risk of re or injury, damaged cords and cables should be
replaced immediately.
8. Clean the amplier with a clean, damp cloth. Do not use solvents or abrasive cleaners. Never pour any liquid on the amplier.
9. When left unused for a long period of time, the power cord should be
unplugged form the outlet.
10. Damaged Ampliers requiring service should be repaired by a qualied
service technician when:
a. The power cord or AC plug has been damaged.
b. Objects have fallen, or liquid has spilled into the unit.
c. The amplier has been exposed to rain or other moisture.
d. The amplier does not appear to operate normally or exhibits
a marked change in performance.
e. The amplier has been dropped or the enclosure
damaged.
11. The user should not attempt to service the amplier beyond that described in the operating instructions. All other servicing should be referred
to qualied service personnel.
Table of Contents
Important Safety Instructions ······························································ 2
Table of Contents ················································································ 4
1 Welcome ························································································· 5
1.1 Features ··············································································· 5
1.2 Using this Manual ································································ 5
2 Setup ······························································································· 6
2.1 Setup Precautions ······························································· 6
2.2 Amplier Installation ···························································· 6
2.3 Proper Cooling Considerations ············································ 7
2.4 Input Connections ······························································· 8
2.5 Output Connections ·························································· 10
3 Operation ······················································································ 14
3.1 Operation Precautions ······················································· 14
3.2 Controls, Indicators, and Connectors ································ 15
3.3 Special Features ································································ 18
4 Troubleshooting ··········································································· 19
5 Technical Specications ······························································ 21
6 Warranty Information ·································································· 22
6.1 Warranty Summary ···························································· 22
6.2 Return Procedure ······························································ 22
7 Accessories ··················································································· 25
8 Notes ····························································································· 26
This amplier proudly designed and manufactured in the USA.
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1 Welcome
Congratulations on the purchase of your new Stewart Audio CVA50MX1 / CVA50PMX-1power amplier. This amplier has been designed and
built to provide you with years of high-quality audio performance and
trouble-free operation. If after reading this manual you should have any
questions concerning amplier installation and operation, please contact your Authorized Stewart Dealer, or you may contact us directly
using the contact information provided on the back of this manual.
1.1 Features
Your Stewart Audio CVA50MX-1 / CVA50PMX-1 amplier is the result
of years of experience in the design and manufacture of quality ampliers. As such it provides a combination of performance and operational
benets that simply cannot be found in conventional ampliers.
Sub Compact 1/3 rack package
4 input mono mixer amplier
Music and re alarm muting
Clean full–range dynamic power
Signal Sense Technology for Energy Star Compliance
Multiple mounting options
External inline power supply
Made in the USA
1.2 Using this Manual
In order to obtain maximum performance from your CVA50MX-1 /
CVA50PMX-1 Amplier, please take time to read this brief owner’s
manual and carefully follow the guidelines for connection and operation.
This manual provides you with the information necessary to safely install and operate your new CVA50MX-1 / CVA50PMX-1 amplier in the
most common scenarios. If you nd yourself requiring additional assistance, please feel free to contact your Authorized Dealer, or you may
contact us directly using the information provided on the back of this
manual.
2 Setup
2.1 Setup Precautions
CAUTION: Before installing your amplier, make sure that
you have read the Important Safety Precautions at the beginning of this manual.
2.2 Amplier Installation
The CVA50MX-1 / CVA50PMX-1 incorporates a number of different
mounting options in order to t your installation needs.
2.2.1 Pole-Mounting
The CVA50MX-1 / CVA50PMX-1 has mount holes on both the top as
well as the side of the unit which can be used with the AV-Pole bracket
available from Stewart Audio.
Pwr
Ducking
Sig Clip
CVA50MX-1
Ducking Sensitivity
Mic/Input 1 Input 2 Input 3 Input 4
Part Number: AV-Pole
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2.2.2 Product Dimensions
6.25in
15.9cm
Mic/Input 1 Input 2 Input 3 Input 4
Ducking Sensitivity
CVA50MX-1
Sig Clip
Front
4in
10.2cm
Side
2.4 Input Connections
1.375in
3.5cm
Ducking
Pwr
1.375in
3.5cm
The CVA50MX-1 / CVA50PMX-1 has 4 inputs which are mixed into the
nal mono output. The rst input channel is for a balanced microphone
and the rest are stereo, unbalanced inputs. All stereo inputs are
summed to mono prior to being mixed.
CVA50MX-1-xxV (70V or 100V):
When a signal is applied to input 1, inputs 2-4 will be ducked as per the
setting of the “duck” control. The level for each input channel is set
with the corresponding control.
volume set the level of all inputs including input 1.
The master volume control and remote
CVA50PMX-1-xxV (70V or 100V):
When a signal is applied to input 1, inputs 2-4 will be ducked as per the
setting of the “duck” control. The level for each input channel is set
with the corresponding control.
The master volume control and remote
volume set the level of inputs 2-4. The input 1 level control is independent and not affected by the master or remote controls.
2.3 Proper Cooling Considerations
Because the CVA50MX-1 / CVA50PMX-1 regulates its temperature using convection cooling and no fans, the amplier must be given adequate space to allow for proper airow. Do not stack the ampliers on
top of each other or mount it in a way that other equipment will block
airow through the case.
CAUTION: Inadequate airow to the amplier can cause the
amplier to overheat and potentially become damaged in
the process. Be sure to provide plenty of air space to allow
for convection cooling.
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2.4.1 Input 1—Microphone
The rst input channel is for a balanced microphone and includes an
adjustable pre-gain as well as phantom power for the use of condenser
microphones. A pin-out diagram compatible with the CVA50MX-1 /
CVA50PMX-1 is included below. For pre-gain adjustment and phantom
power, refer to Section 3.2.2.
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3
Female XLR
Pin 1 - Ground
Pin 2 - Hot (+)
Pin 3 - Cold (
-
)
Input 1 Mic
Gnd
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2.4.2 Input 2—RCA
The second input channel is a stereo RCA jack which is then summed
to mono before the nal output. Refer to the diagram below for wiring
directions.
+/Right
Right
Shield
+/Left
Left
+
Ground
(Shield)
2.4.3 Input 3—Stereo Euroblock
The third input channel is a euro block connector which can be wired to
any unbalanced input. Should you be wiring up a stereo source, use
both the left and right pins of the connector. A mono source will only
require the use of the ground and left pins.
2.4.4 Input 4—Stereo 3.5mm
The second input channel is a stereo RCA jack which is then summed
to mono before the nal output. Refer to the diagram below for wiring
directions.
+/Left
2.5 Output Connections
Stewart Audio recommends using high-quality speaker wire and connectors to send the output signal of your amplier to the speakers. The
gauge of the wire will be dependent on both the output type used (4/8
ohm, 25V/70V, or 25V/100V) as well as the length of the run to the
speakers. Use the following tables as a guideline when selecting your
wire gauge.
4/8 Ohm Installation
Speaker leads connect by means of terminal block connectors supplied
with the unit. Strip speaker leads 1/4” and insert into connector observing proper polarity. With a small, at-blade screwdriver, tighten the
screw until the leads are held securely in place. Inspect for possible
shorts or broken wires.
Distance Wire Gauge
Up to 25 ft. 16 AWG
26-40 ft. 14 AWG
41-60 ft. 12 AWG
25V/70V/100V Installation
Distance Wire Gauge
Up to 500 ft. 22 AWG
500-1000 ft. 20 AWG
Over 1000 ft. 18 AWG
-/Right
Ground
(Shield)
+/Left
-/Right
Ground
(Shield)
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2.5.1 25W x 2 @ 4/8 ohms
The CVA50MX-1 / CVA50PMX-1 allows for two output channels into 4
or 8ohms at 25 watts a channel. Both channels will have identical
mono output, they will not correlate to left or right channels. Refer to
the diagram below when connecting speakers in this setup.
*70V / 100 V
COM
CH2 +25V
CH2 -
CH1 +
CH1 -
2.5.2 50W x 1 @ 8 ohms
The CVA50MX-1 / CVA50PMX-1 can bridge it’s 4/8 ohm output into one
50W channel. This can be done by connecting standard speakers to the
+25V output, similar to using a 25V constant voltage system without
the transformers. Refer to the diagram below when connecting speakers in this setup.
*70V/100V
COM
CH2 +25V
CH2 -
CH1 +
CH1 -
Channel 1
+
+
Channel 2
-
8 Ω
25W
*25V/70V or 25V/100V based on model selection.
25W
-
-
+
50W
8 Ω
*25V/70V or 25V/100V based on model selection.
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2.5.3 Constant Voltage (25V/70V/100V)
The CVA50MX-1 / CVA50PMX-1can additionally be setup as a constant
voltage amplier for a distributed audio solution. It is capable of supplying both 25V and 70V output or 25V and 100V output. Refer to the following diagrams below when connecting speakers.
*70V/100V
COM
CH2 +25V
CH2 -
CH1 +
*70V/100V
COM
CH2 +25V
CH2 -
CH1 +
-
+
25V
(50W total)
*25V/70V or 25V/100V based on model selection.
CH1 -
*70V/100V
+
70V
(50W total)
COM
CH2 +25V
CH2 -
CH1 +
-
CH1 -
+
100V
(50W total)
CH1 -
-
2.5.3 Line Out
The CVA50MX-1 / CVA50PMX-1 includes a post-mix unbalanced Line
Out on the rear of the amplier using a 2-pin Euroblock connector. This
can be used for Assisted Listening applications, recording, or daisychaining multiple ampliers.
3 Operation
3.1 Operating Precautions
1. Before use, your amplier must be congure for proper operation,
including input and output wiring hookup. Improper wiring can result in damage to equipment or potentially harm to the operator.
Consult section 2 for setup instructions.
2. Tampering with the circuitry, or making unauthorized changes is
not only dangerous but may also violate local regulations.
3. Use care when making connections between the amplier and the
input or output equipment. Using equipment that is not capable of
handling the output wattage may lead to permanent damage.
NOTE: Stewart Audio will not be held responsible for
damage to your CVA50MX-1 / CVA50PMX-1 or connected equipment if the instructions in this manual are not
followed.
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3.2 Indicators and Controls
2
3
4
5
9
1
2
3
4
5
8
9
6
7
6
7
8
3.2.1 Indicators
Mic/Input 1 Input 2 Input 3 Input 4
The CVA50MX-1 / CVA50PMX-1 has 3 front panel LED indicators. The
power indicator (Pwr) will illuminate bright blue when power is supplied
Ducking Sensitivity
CVA50MX-1
Sig Clip
Ducking
Pwr
to the amplier. If power is supplied but the LED is off, this means that
the amplier is in sleep mode. Once signal is detected by the Signal
Sense circuit, the LED will turn back on.
See Wiring Diagram
70V
COM
CH2 +25V
CH2 -
CH1 +
CH1 -
Power
+ -
UL 2043 Plenum Rated
Line Out
10VC
RVC
Gnd
Mute
Gnd +
10
11
Input 4
12
Input 3
Gnd R L
13
14
Input 2
R
Input 1 Mic
L
15
- Gnd +
16
Mic
Gain
High
Low On
Phan
Pwr
O
The Signal Present indicator (Sig) will illuminate green when signal is
detected on any of the 4 input channels.
The last indicator is the Clip/Distortion LED. This indicator means that
one of the input signals is too “hot” and will sound distorted when amplied. To x this, the gain should be reduced at the preamp or mixer
level.
Input Volume Controls
1
Master Volume Control
Ducking Sensitivity Knob
Ducking Knob
Signal Present Indicator LED
Clip Indicator LED
Power Indicator LED
Output Euroblock
*CVA50MX-1:
When a signal is applied to input 1, inputs 2-4 will be ducked as per the setting of the
“duck” control. The level for each input channel is set with the corresponding control.
The master volume control and remote volume set the level of all inputs including input
1.
*CVA50PMX-1:
When a signal is applied to input 1, inputs 2-4 will be ducked as per the setting of the
“duck” control. The level for each input channel is set with the corresponding control.
The master volume control and remote volume set the level of inputs 2-4. The input 1
level control is independent and not affected by the master or remote controls.
Remote Volume Control
Remote Muting
10
Line Out
11
Input 4 - Stereo 3.5mm
12
Input 3 - Stereo Euroblock
13
Input 2 - Stereo RCA
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Input 1 - Balanced Microphone
15
Microphone DIP Switches
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3.2.2 Controls
All CVA50MX-1 / CVA50PMX-1 controls are located on the rear of the
unit. There is no power switch so the CVA50MX-1 / CVA50PMX-1 will
turn on whenever power is supplied to it. The CVA50MX-1 /
CVA50PMX-1’s Signal Sense Technology (SST™) will power up the
amplier from sleep when a signal is detected. After 5 minutes without
an input signal the amplier will go into sleep mode.
The front panel contains a volume control for each input channel as
well as a master volume. It also contains 2 recessed controls for the
microphone ducking. For more information on this, refer to section
3.3.2.
Note: For the highest sound quality, leave the master volume knob as low as possible and increase the channel volume before increasing the master volume.
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The rear panel of the CVA50MX-1 / CVA50PMX-1 includes a set of 4
DIP switches which control both the pre-gain of the microphone as
well as the +48VDC phantom power.
The “Mic Gain” setting will adjust for the sensitivity of microphones by
different manufacturers beyond what the volume control offers. If the
microphone is generally too loud, select the “High” setting by pushing
both switches up. If the microphone is generally too quiet, select the
“Low” setting by pushing both switches down.
If you are using a condenser microphone requiring +48VDC phantom
power to operate, slide both switches down. Otherwise, leave the
switches in the “up” position.
The diagram below is an example of a condenser microphone (requiring
phantom power) and is loud enough without additional pre-gain supplied by the amplier.
Mic
Phan
Gain
High
Pwr
O
3.3 Special Features
3.3.1 Signal Sense Technology™
Stewart Audio’s Signal Sense Technology™ puts the amplier into an
Energy Star compliant sleep mode after ve minutes of no signal being
detected on any input channels. The blue Power Indicator LED will go
off and the amplier will wait for signal to be present again. Once signal is present, the amplier will return to normal operation.
3.3.2 Microphone Ducking
The CVA50MX-1 / CVA50PMX-1 includes a ducking feature which allows the microphone channel (Input 1) to talk over the other 3 channels. When a loud enough sound is detected on Input 1 it will lower
channels 2-4 by a set amount. Both the sound threshold to activate the
ducking (Ducking Sensitivity) and the amount the other channels are
lowered (Ducking) are congurable via knobs on the front panel.
To properly adjust the ducking you should rst play a typical source audio (song, movie, etc..) through any of the channels 2-4. Once this is
playing, connect a microphone to channel 1 and begin to speak at a
typical level. You should hear the source audio lower when you speak
into the microphone. Using a small screwdriver, adjust the “Ducking
Sensitivity” knob to set the sound threshold which activates the ducking. Next, adjust the “Ducking” knob to set the amount the other channels should be lowered. Turning the knob all the way counter-clockwise
will mute channels 2-4 when ducking is activated.
Low On
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4 Troubleshooting
Problem: Power indicator does not turn on.
Procedure: Check that the amplier is plugged into a live outlet. After
you have ensured that it is not a power issue, disconnect any speakers.
If the amplier turns on after a few seconds delay, then the problem is
in the output connection. Check wiring and speakers for short circuits.
Problem: No output on one or both channels; Power indicator is
lit.
Procedure: Check that level controls are not turned down. Check that
input and output connections are secure. Refer to section 2.5 to ensure that you have properly connected your speakers. Ensure signal
present LED is ashing to denote a signal. If there is no signal detected
check signal source and that level controls are set high enough.
Problem: Microphone level is too low even after adjusting level
knob
Procedure: Refer to section 3.2.2 to adjust the gain switch on the rear
of the amplier.
Problem: Channels 2-4 cut out while speaking into the microphone
Procedure: This is part of an intended feature calling ducking. Refer to
section 3.3.2 to adjust this to a more acceptable level.
Problem: Amplier overheats and/or shuts off.
Procedure: Review section 2.3 on proper cooling procedures. Check
the signal lights on the front of the amplier to see if the signal is overdriving (the Clip light ashes red frequently). Overdriving the amplier
for extended periods of time can cause a thermal shutdown.
4 Troubleshooting (Cont.)
Problem: Output sound is distorted or cracking.
Procedure: Check all cables for damage or loose connections and re-
duce the gain on the input signal at the mixer or preamp level. Replace
the cables and loudspeakers temporarily to see if this resolves the
problem. If problem still exists, contact your Authorized Dealer for service.
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5 Technical Specications
Maximum Output
25V/70V/100V 50W x 1
4/8 Ohm 25W x 2 or 50W x 1
Frequency Response (Full Power) 100Hz-20kHz
Bandwidth +/- 3.0dB 80Hz-30kHz
THD+N <0.1% at 1W
Signal to noise ratio >90dB
Remote Volume Control 0-10VDC
Remote Muting Contact Closure
Microphone Ducking 0 to –90dB (Adjustable)
Phantom Power +48VDC (Switchable)
Input Sensitivity of Mic Input 0dB (1V) or –30dB (30mV)
Input Sensitivity of Inputs 2-4 0dB (1V)
Standard Voltage Gain 40x (32dB(
Input Impedance 10kOhms
Standby, Idle, 1/8 Power Draw .005/.01/.15 Amps
Class D
Input Connectors
Output Connectors Euroblock
Power Supply External in-line 48VDC
Cooling Convection-cooling (No fans)
Controls 4 Level knobs, 1 Master, Ducking
LED Indicators 1.25in (3.2cm)
Construction 4.35in (11.1cm)
Dimensions (H, W, D) 3.2in (8.1cm)
Weight 0.37bs (0.16kg)
Mic (3-pin Euroblock), RCA,
3.5mm, 3-pin Euroblock
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6 Warranty Information
6.1 Warranty Summary
All Stewart Audio ampliers and accessories, unless excluded in this
summary, are covered by a 3-year limited warranty on parts and labor
from the data of purchase. In order to be eligible for warranty repairs,
the ampliers and accessories must have been purchased through an
authorized Stewart Audio dealer and submitted by the original purchaser. This warranty is only valid in the country in which the amplier was
purchased.
6.1.1 Eligibility Requirements.
Stewart Audio warrants against all malfunctions which come as a result
of component or manufacturer defect. The amplier is also covered
from all failures which arise during the warranty period (3 years from
date of purchase) that are not a result of misuse. The following actions
will void your warranty:
The power cord or AC plug has been damaged through misuse.
The amplier has been exposed to moisture or extreme tempera-
tures.
The amplier has been dropped, items have been dropped on the
amplier, or the enclosure has been damaged.
The amplier has been opened by the operator.
The amplier was improperly packaged when sending to the fac-
tory for repair, resulting in damage.
Any of the precautions or instructions found in this manual were
not followed.
Damages resulting to the amplier which are not covered under this
warranty can be factory-repaired at cost to the customer. Use the contact information below to initiate the repair process.
6.2 Return Procedure
This section includes the return procedures which must be followed in
order to prevent processing delay or cost to the customer. Please read
the entire section before contacting Stewart Audio for returns.
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6.2.1 Return Authorization Number
All returns to the factory for service must be accompanied by a Return
Authorization (RA) number. One can be obtained by contacting Stewart
Audio at (209) 588-8111 or via e-mail at [email protected].
NOTE: Any defective products received without an RA number
will be returned to sender at their expense.
If Stewart Audio is unable to contact the sender in 14 days, the merchandise will be considered scrap and may be disposed of.
6.2.2 Shipment Instructions
If Stewart Audio requests that you ship the defective product back to
their service center, please refer to the guide below. To ensure prompt
warranty service, be sure to follow all instructions.
1. Return Authorization (RA) is required for product being sent to the
factory for service.
2. See packing instructions in section 6.2.3.
3. Ship the defective product using a method which provides for order tracking or order conrmation. The service center is located at
the following address:
Stewart Audio
14397 Cuesta Court Suite D1
Sonora, CA 95370
4. Use a bold black marker and write the RA number on three sides
of the box.
5. Record the RMA number for future reference. The RA number can
be used to check the repair status.
6.2.3 Packaging Instructions
Should Stewart Audio request that you ship your product to their service center, these instructions must be followed in order to ensure safe
delivery. If they are not followed, Stewart Audio assumes no responsibility for damaged goods and/or accessories that are sent with your
unit.
6.2.3 Packaging Instructions (cont.)
1. Please write the RA number on three sides of the box. Include the
Stewart Audio RA number inside the box and a brief description of
the problem.
2. Do not ship any accessories (manuals, cords, hardware, etc.) with
your unit. These items are not needed to service your product.
Stewart Audio will not be held responsible for these items if they
are returned with the ampliers.
3. When shipping your amplier, it is important that it has adequate
protection. We recommend you use the original packing material
when returning the product for repair. If you do not have the original box, see number 4.
4. If you provide your own shipping pack, the minimum recommended requirements for materials are as follows:
a. 275 P.S.I. burst test, Double-Wall carton that allows for 2-
inch solid Styrofoam on all six sides of unit or 3 inches of
plastic bubble wrap on all six sides of unit.
b. Securely seal the package with an adequate carton sealing
tape.
c. Do not use light boxes or “peanuts”.
NOTE: Damage caused by poor packaging will not be covered
under warranty.
6.2.4 Estimate Approval
An estimate for all non-warranty repairs will be provided to the customer once the unit has been shipped to the factory. The customer is responsible to approve this estimate within 7 days. If the repairs are not
approved within 14 days, Stewart Audio reserves the right to consider
the unit scrap and may discard it.
6.2.5 Payment of Non-Warranty Repairs
Payment for non-warranty repairs must be submitted to Stewart Audio
before the product will be returned to the customer.
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7 Accessories
The following accessories are available from Stewart Audio for your
amplier.
All part numbers shown are Stewart Audio Part Numbers.
Mounting Brackets
AV-POLE Pole-mount bracket for compact ampliers
8 Notes
AV-BRACKET Universal mounting bracket for compact ampliers
Connection Adapters
ADPT-RCA Mono Female RCA to male Euroblock.
ADPT-SUMRCA Stereo Female RCA to male Euroblock.
ADPT-SUM35 Stereo Female 3.5mm to male Euroblock
Wall Plates
WP-RVC-B Wallplate with 10k potentiometer and knob for re-
mote volume control (Black)
WP-RVC-A Wallplate with 10k potentiometer and knob for re-
mote volume control (Aluminum)
To purchase these accessories or to see the full
Stewart Audio product lineup, visit us at:
www.stewartaudio.com
For Your Record
In the spaces provided below, record the model and serial
number located at the rear of your amplier.
Model No. ________________________________________
Serial No. _________________________________________
25
Purchase Date _____________________________________
Retain this information for future reference.
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8 Notes (Cont.)
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14397 Cuesta Court
Suite D1
Sonora, Ca. 95370
Phone: 209-588-8111
Fax: 209-588-8113
www.stewartaudio.com
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