Stewart Audio AV25-2 NET Series, AV25-2 NET+ Owner's Manual

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AV25-2 NET Series
Owner’s Manual
December 2014
www.stewartaudio.com
AV25-2 NET+
AV25-2 NET
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Important Safety Instructions
Before using your Stewart Audio Inc. Power Amplier, 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.
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 sufcient 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 am­plier is installed or operated. Retain these instructions for future refer­ence. All instructions should be followed; all warnings on the amplier 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 amplier should be situated so that its location and position does not interfere with its proper ventilation. For example, the amplier must not be placed on a rug, bed, sofa or similar surface that impedes airow across the chassis. Airow through the ventilation openings should be unobstructed.
4. This amplier should not be used near water, for example, near a bathtub, in a wet basement, near a swimming pool, etc. This amplier is intended to be operated in a controlled indoor environment.
5. Do not place the amplier near heat sources such as radiators, heat regis­ters, stoves, or other appliances that produce heat.
6. The amplier 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­er. To prevent risk of re or injury, damaged cords and cables should be replaced immediately.
8. Clean the amplier with a clean, damp cloth. Do not use solvents or abra­sive cleaners. Never pour any liquid on the amplier.
9. When left unused for a long period of time, the power cord should be unplugged form the outlet.
10. Damaged Ampliers requiring service should be repaired by a qualied 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 amplier has been exposed to rain or other moisture. d. The amplier does not appear to operate normally or exhibits
a marked change in performance. e. The amplier has been dropped or the enclosure damaged.
11. The user should not attempt to service the amplier beyond that de­scribed in the operating instructions. All other servicing should be referred to qualied service personnel.
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1 Welcome
Congratulations on the purchase of your new Stewart Audio AV Series power amplier. This amplier 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 amplier 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 AV Series amplier is the result of years of experience in the design and manufacture of quality ampliers. As such it provides a combination of performance and operational benets that simply cannot be found in conventional ampliers.
 Sub Compact 1/3 rack package
 Two channel networked amplier, optimized to drive 4
Ohm and 8 Ohm loads
 Selectable priority switching on NET+ models
 Clean full–range dynamic power
 Signal Detect trigger for sleep & wake up
 Multiple mounting options
 Made in the USA
1.2 Using this Manual
In order to obtain maximum performance from your AV Series Ampli­er, 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 AV Series amplier 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 contact information provided on the back of this manu­al.
Table of Contents
This amplier proudly designed and manufactured in the USA.
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 Amplier Installation ···························································· 6
2.3 Proper Cooling Considerations ··········································· 8
2.4 Input Connections ······························································ 9
2.5 Output Connections ·························································· 11
3 Operation ····················································································· 13
3.1 Operation Precautions ······················································· 13
3.2 Controls, Indicators, and Connectors ································ 14
3.3 Dante ················································································· 17
3.4 Remote Volume Control ···················································· 19
4 Troubleshooting ·········································································· 20 5 Technical Specications ····························································· 21 6 Warranty Information ·································································· 22
6.1 Warranty Summary ··························································· 22
6.2 Return Procedure ····························································· 22
7 Accessories ·················································································· 25 8 Notes ···························································································· 26
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2 Setup
2.1 Setup Precautions
CAUTION: Before installing your amplier, make sure that you have read the Important Safety Precautions at the be­ginning of this manual.
2.2 Amplier Installation
The AV25-2 NET series incorporates a number of different mounting options in order to t your installation needs.
2.2.1 Pole-Mounting
The AV Series of ampliers is Stewart Audio’s rst line of pole­mountable ampliers. The AV25-2 NET series has mounting holes on the top of the unit which can be used with the AV-Pole bracket availa­ble from Stewart Audio.
Part Number: AV-Pole
2.2.1 Universal-Mount Installation
The AV25-2 NET series also has a universal bracket available which al­lows the unit to be mounted against a wall or under a table. Two screws are included in the kit which will afx the bracket to the top or the side of the unit. Once this is done, two holes are available for mounting the unit where desired.
CAUTION: Use only the screws provided in mounting brackets to the amplier. Do not over tighten.
Part Number: AV-Bracket
AV25-2 NET+
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2.2.3 Product Dimensions
2.3 Proper Cooling Considerations
Because the AV25-2 NET series is convection cooled with no fans, the amplier must be given adequate space to allow for proper airow. Do not stack the ampliers on top of each other or mount it in a way that other equipment will block airow through the case.
CAUTION: Inadequate airow to the amplier can cause the amplier to overheat and potentially become damaged in the process. Be sure to provide plenty of air space to allow for convection cooling.
2.4 Input Connections (NET+ Model Only)
Your AV25-2 NET+ amplier is provided with a 3-pin Phoenix connector for each input. This connector will accept both balanced or unbalanced connections, however some modications must be made for an unbal­anced connection. See the next two sections for instructions on con­necting your amplier to its input source.
2.4.1 Balanced Connections
When using a balanced input source and connector, you must ensure that the hot, cold, and ground pins of the connector are matched up to the +, -, and ground pins of the AV25-2 NET+’s Phoenix connector re­spectively. Diagrams have been provided for standard XLR and TRS connectors. Please refer to the manual of your input source in case it does not follow the standard pin-out.
Male TRS
Input Connector
Ground
(Shield)
+
-
+
(Connector enlarged to show detail)
-
+
-
+
Female XLR
Input Connector
-
+
-
+
AV25-2 NET+
6.00in
15.3cm
1.25in
3.2cm
1.25in
3.2cm
4.00in
10.2cm
Front
Side
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2.4.2 Unbalanced Input Connections
When using an unbalanced input source and connector, a jumper must be added between the negative (-) terminals and the ground terminals. Once this has been done, the unbalanced source can be connected to the positive (+) and ground terminals. Please refer to the manual of your input source in case it does not follow the standard pin-out. For your convenience, pre-wired connectors are available for purchase, see the next page for details.
NOTE: A jumper is required for connecting an unbalanced input.
NOTE: The AV25-2 Series of ampliers do not accept ste­reo inputs. Either one side must be selected from the ste­reo source or an overload-protected Y-cable must be used to sum them to mono. It is highly recommended that you purchase the pre-wired connectors mentioned on the next page. Damage to source equipment can result from the
Pre-wired unbalanced connectors are available for purchase from Stew­art Audio. These will allow for a quicker installation with less room for error when connecting the CVA Series amplier to an unbalanced source. The summing adapters will properly sum a stereo source for use with the mono input on the rear of the amplier without causing sound cancellation. Part numbers are found below the diagrams.
ADPT-RCA
Mono
Female RCA
ADPT-SUMRCA
Stereo
Female RCA
ADPT-SUM35
Stereo
Female 3.5mm
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2.5 Output Connections
Stewart Audio recommends using high-quality, heavy-gauge speaker wire and connectors to send the output signal of your amplier to the speakers. Use the following table as a guideline when selecting your wire gauge.
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
+
-
+ - +
-
+
-
Terminal Block Connector
(Rear of AV25-2 NET)
Channel 2
Channel 1
3 Operation
3.1 Operating Precautions
1. Before use, your amplier must be congure 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 amplier 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 AV25-2 NET series amplier or connect­ed equipment if the instructions in this manual are not followed.
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3.2 Controls, Indicators, and Connectors
AV25-2 NET+
PRIORITY
NETWORK
#2 Speaker #1
- + - +
- +
PWR
+10V
RVC
GND
MUTE
RVC#2 LINE OUT #1#2 LOCAL IN #1
+ - + -
NET LOC
SIG PWR #2 CLIP #1
+ +
LEVEL
1
2
1
1
2
3
6 7 8
4
5
1
2
3
6
7
8
Signal Priority Switch
Network Connector
Channel 2 Level Knob
Line Out
Remote Volume Control
Signal Present Indicator LED
4
5
9
Channel 1 Level Knob
Input Connector
Power Indicator LED
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11
12
12
10
109
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11
12
12
10
10
Clip Indicator LEDs
Power Connector
Speaker Out Connector
AV25-2 NET
NETWORK
#2 Speaker #1
- + - +
- +
PWR#2 LINE OUT #1
SIG PWR
+ +
1
1
2 3
1
2
3
Network Connector
Line Out
Signal Present Indicator LED
4
Power Indicator LED
5
6
4 5
6
Power Connector
Speaker Out Connector
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3.2.1 Indicators
The AV25-2 NET series has up to 4 rear panel LED indicators. The rst is the power indicator which will illuminate when power is supplied to the amplier. The second light is the signal present LED which will illu­minate when signal is detected on either one of the input connection channels. The nal 2 LED indicators (only on the NET+ models) are the “Clip” indicators, one for each channel. These lights will indicate that the input signal is too “hot” and will sound distorted when amplied. To x this, the gain should be reduced at the preamp or mixer level.
3.2.2 Controls (NET+ Models Only)
All AV25-2 NET+ controls are located on the rear of the unit. There is no power switch so the AV25-2 NET+ will turn on whenever power is supplied to it.
The rear panel contains two individual channel volume knobs . The am­plier is set to run off of a line-level source and the level should be ad­justed for optimum performance. To adjust this knob, you will need a small at-head screwdriver. While a typical program source level is present, turn the rotary knob as far clockwise as you can without hear­ing distortion or without the “Clip” indicator illuminating. If the signal is distorting and the knob is all the way counter-clockwise, adjust the gain down at the source level.
3.2.3 Signal Priority Switching (NET+ Models Only)
The AV25-2 NET+ amplier includes selectable priority switching which allows either the network or local input to override the other in­put depending on the switch setting. The switch position should be set to the priority input -- the signal that will interrupt the "normal" program. When audio is detected on that priority input the amplier will mute the signal from the other ("normal") input. After an approximately 3.5 sec­ond period with no signal on the priority channel, the "normal" signal will be un-muted. For example, if a local microphone is to be used as a priority page, set the priority switch to "Local". When a microphone signal is detected the "normal" network audio will be muted and the page will come through
3.3 Dante
If you have selected the Dante version of the AV25-2 NET series, con­guration is done using the Dante Controller software from Audinate.
Dante Controller Software can be found on Audinate’s website at
www.audinate.com.
From there you can select Dante Controller under the Products section. This will require registration for Audinate’s portal and also includes ac­cess to the Dante Controller User Manual which should be read for complete conguration instructions.
3.3.1 Using Audinate’s Dante Controller Software
Once Dante Controller has been installed following the instructions in the Dante Controller Software User Manual (found at
www.audinate.com), launch the application to see the connection
matrix.
Unlike CobraNet, Dante does not require IP conguration or bundle conguration. Instead, connections are made on the connection matrix shown above
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All Stewart Audio products will ship from the factory as being named Ultimo-<MAC>. This can be renamed within the device conguration in the Dante Controller.
Transmitters are shown on the top of the matrix while Receivers are shown on the left-hand side. The AV25-2 NET series includes 2 trans­mitters and 2 receive channels. In order to make a connection, click on the matrix node between the appropriate transmitter and receiver. If a connection is successful, it will display a green checkmark.
3.3.2 Dante FAQ
Q: I am having problems installing or using the Dante Controller Soft­ware
A: Please refer to the ofcial documentation available in the Audinate portal where you downloaded the Controller Software.
Q: I do not see the AV25-2 NET series showing up on the network?
A: All Stewart Audio products are tagged as Ultimo-<MAC_ADDRESS> from the factory. You can nd the correct Ultimo device by choosing the correct MAC address from the list. You can rename this using the device conguration.
3.4 Remote Volume Control (NET+ Models Only)
AV25-2 NET+ ampliers can have their volume remotely controlled (or muted) via the Euro Block input on the rear of the amplier. The remote volume control allows the units volume to be controlled through the use of an external potentiometer which can be located wherever con­venient for the user. Remote muting is also useful for re-alarm situa­tions in which all unnecessary sound must be silenced.
NOTE: If the remote volume control connector is utilized, it will override the volume knob on the rear of the unit.
In order to remotely control the volume of the unit, a 10k-ohm potenti­ometer should be placed between the +10V pin and the GND (Ground) pin on the rear of the unit with its wiper on the RVC pin. The volume will be determined by the selected resistance on the potentiometer, the greater the resistance the louder the volume.
The amplier can be remotely muted by making a connection between the GND pin and the MUTE pin. No power should be applied to these pins, simply a contact connection.
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4 Troubleshooting
Problem: Power indicator does not turn on.
Procedure: Check that the amplier is plugged into a live outlet. After
you have ensured that it is not a power issue, disconnect any speakers. If the amplier 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. 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: Amplier overheats and/or shuts off.
Procedure: Review section 2.3 on proper cooling procedures. Check
the signal lights on the rear of the amplier to see if the signal is over­driving (the signal light ashes red frequently). Overdriving the amplier for extended periods of time can cause a thermal shutdown.
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.
5 Technical Specications
Maximum Output 30Hz - 20kHz
Stereo 25W @ 8Ω per channel
35W @ 4Ω per channel
Frequency Response (+0, -3 dB) 30Hz-20kHz
Bandwidth +/- 3.0dB 30Hz-30kHz
THD+N <0.1%
Signal to noise ratio >100dB
External Mute 5-12VDC
Slew Rate 30V/ms
Input Sensitivity 0.5V (-3 dBV)
Standard Voltage Gain 28X (26.5dB)
Input Impedance (Balance/Unbalanced) 20k Ohms/10k Ohms
Power Consumption: Idle; 1/8 Draw 6.1 Watts; 14 Watts
Class D
Input Connectors RJ45, Euro Block (NET+)
Output Connectors Euro Block
Power Supply External In-Line 48VDC
Cooling Convection-Cooling
Controls Level (NET+)
LED Indicators Power, Signal Present &
Clip
Construction Aluminum Chassis
Dimensions
Height 1.25in (3.2cm)
Width 6in(15.2cm)
Depth 4in (10.2cm)
Weight 0.57lbs (0.26kg)
Stewart Audio reserves the rate to change features and specications without notice.
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6 Warranty Information
6.1 Warranty Summary
All Stewart Audio ampliers 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 ampliers 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 amplier was purchased.
6.1.1 Eligibility Requirements.
Stewart Audio warrants against all malfunctions which come as a result of component or manufacturer defect. The amplier 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 amplier has been exposed to moisture or extreme tempera-
tures.
 The amplier has been dropped, items have been dropped on the
amplier, or the enclosure has been damaged.
 The amplier has been opened by the operator.  The amplier 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 amplier 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.
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@stewartaudio.com.
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 conrmation. The service center is located at the following address:
Stewart Audio 14335 Cuesta Court Suite C 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.
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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. You will be advised during the RA process what accessories should be included with the amplier (Power supplies, connectors, cords, etc.). This is dependent on the failure assessment.
3. When shipping your amplier, 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.
7 Accessories
The following accessories are available from Stewart Audio for your amplier.
All part numbers shown are Stewart Audio Part Numbers.
To purchase these accessories or to see the full
Stewart Audio product lineup, visit us at:
www.stewartaudio.com
Mounting Brackets
AV-POLE Pole-mount bracket for AV Series ampliers
AV-BRACKET Universal mounting bracket for AV Series ampliers
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
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)
Wall Plates
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