Stewart Audio AV-50 Owner'S Manual Download Page 2

Important Safety Instructions 

 
Before using your Stewart Audio Inc. Power Amplifier, please read this 

Owner’s Manual 

carefully to ensure optimum trouble-free perform-

ance. 
 

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.

    

 
 
 
 
 
 
 
 
 
 

 
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 sufficient mag-
nitude 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 am-

plifier is installed or operated. Retain these instructions for future refer-
ence. All instructions should be followed; all warnings on the amplifier 
and in the operating instructions should be adhered to.   

 

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

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.

3.  The amplifier should be situated so that its location and position does not 

interfere with its proper ventilation. For example, the amplifier must not 
be placed on a rug, bed, sofa or similar surface that impedes airflow 
across the chassis. Airflow through the ventilation openings should be 
unobstructed. 

 
4.  This amplifier should not be used near water, for example, near a bathtub, 

in a wet basement, near a swimming pool, etc. This amplifier is  intended 
to be operated in a controlled indoor environment. 

 
5.  Do not place the amplifier near heat sources such as radiators, heat regis-

ters, stoves, or other appliances that produce heat. 

 
6.  The amplifier 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 ampli-
fier. To prevent risk of fire or injury, damaged cords and cables should be 
replaced immediately. 

 
8.  Clean the amplifier with a clean, damp cloth. Do not use solvents or abra-

sive cleaners. Never pour any liquid on the amplifier. 

 
9.  When left unused for a long period of time, the power cord should be 

unplugged form the outlet. 

 
10.  Damaged Amplifiers requiring service should be repaired by a qualified 

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 amplifier has been exposed to rain or other moisture. 

d.  The amplifier does not appear to operate normally or exhibits 

a marked change in performance. 

e.  The amplifier has been dropped or the enclosure  
 damaged. 

 

11. The user should not attempt to service the amplifier beyond that de-

scribed in the operating instructions. All other servicing should be referred 
to qualified service personnel. 

Summary of Contents for AV-50

Page 1: ...Clip Clip Power Power AV Series AV Series AV 50 2 AV 50 2 AV 50 February 2010 Owner s Manual www stewartaudio com ...

Page 2: ...interfere with its proper ventilation For example the amplifier must not be placed on a rug bed sofa or similar surface that impedes airflow across the chassis Airflow through the ventilation openings should be unobstructed 4 This amplifier should not be used near water for example near a bathtub in a wet basement near a swimming pool etc This amplifier is intended to be operated in a controlled i...

Page 3: ...to obtain maximum performance from your AV Series Ampli fier 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 in stall and operate your new AV Series amplifier in the most common scenarios If you find yourself requiring additional assistance please feel free to conta...

Page 4: ...following diagrams CAUTION Use only the screws provided in mounting brackets to the amplifier Do not overtighten 2 2 2 Rack Mount Installation The AV 50 may also be rack mounted in a standard 19 48 3cm equip ment rack using the optional rack mount kit Part Number RMK 50 S The amplifier takes up 1U 1 75 of vertical space CAUTION Use only the screws provided in mounting brackets to the amplifier Do ...

Page 5: ...ctions Stewart Audio recommends using high quality heavy gauge speaker wire and connectors to send the output signal of your amplifier to the speakers Use the following table as a guideline when selecting your wire gauge Speaker leads connect by means of Phoenix type block connectors supplied with the unit Strip speaker leads 1 4 and insert into connec tor observing proper polarity With a small fl...

Page 6: ...phono connectors Nothing should be connected to Channel 1 If us ing the 3 5mm stereo input the right ring channel s signal will be used Output Connections Prepare the speaker leads as described in section 2 5 The speaker leads should be attached to the Phoenix block connector with regard to their polarity See diagram for further clarification The amplifier is now ready for Single mode operation Ph...

Page 7: ...ing channel s sig nal will be used Output Connections Prepare the speaker leads as described in section 2 5 The speaker leads should be attached to the positive terminals of both channels terminals 1 and 4 Nothing should be attached to speaker terminal 2 and 3 See diagram for further clarification Put Amplifier into Bridge Mono Mode Slide the rear panel switch marked Bridge Mono Stereo to the Brid...

Page 8: ...panel has only one control a push button to control the power of the unit When the push button is depressed the power is on When the button is push button is out the power is off The rear panel contains two input sensitivity knobs as well as a mode switch The amplifier is set to run off of a line level source and the sen sitivity should be adjusted for optimum performance To adjust this knob you w...

Page 9: ...e the cables and loudspeakers temporarily to see if this resolves the problem If problem still exists contact your Authorized Dealer for ser vice If after reading this troubleshooting section you are unable to restore proper function return it to your Authorized Dealer for service Refer to section 6 for instructions 5Technical Specifications Maximum Output 20Hz 20kHz Stereo 25W 8Ω per channel 50W ...

Page 10: ...e 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 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 support ste...

Page 11: ...te for all non warranty repairs will be provided to the cus tomer 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 con sider the unit scrap and may discard it 6 2 5 Payment of Non Warranty Repairs Payment for non warranty repairs must be submitted to St...

Reviews: