Audio Distribution System
Installation and Operation Guide
Creating the future of home entertainment - today.
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This document explains features and configuration
of the MU290 for Musica
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NetStreams Musica Power Amplifier
Table of Contents
Introduction
Safety
1
2
4
5
6
6
7
9
9
Features
Configuring for Stereo Operation
Configuring for Bridged (Mono) Operation
MU290 Input Controls
Configurations
Mounting
Special Consideration
Trouble Shooting
Specifications
9
10
I
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NetStreams Musica Power Amplifier
Introduction
The MU290 amplifier offers high performance, high efficiency, low power consumption and
extended duty cycles in a very compact half-rack/flat-back package.
The MU290 Power Amplifier is a high quality, class A/B amplifier. This powerful yet
compact amplifier utilizes Darlington pairs for linear operation and offers 90 watts per
channel or 200 watts bridged into a 4 ohm load. In keeping with Musica’s system design of
distributed amplification, the MU290 allows you to install the amplifier in the room close to
the speakers. This amplifier is designed to be either rack-mounted, flat-back mounted or
set on a shelf.
In order to obtain maximum performance from your MU290 Power Amplifier, please take
the time to read this brief manual and carefully follow the guidelines for connection and
operation.
If after reviewing this manual you should have any questions concerning installing and
All specifications subject to change without notification. All rights reserved. Copyright©2004 NetStreams
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NetStreams Musica Power Amplifier
Safety
Before using your MU290 External Amplifier, please read this Owner’s Manual carefully to
ensure optimum trouble-free performance.
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE
THIS APPLIANCE TO RAIN OR MOISTURE. CAUTION TO REDUCE THE RISK OF
ELECTRIC SHOCK, DO NOT REMOVE COVER. NO USER - SERVICEABLE PARTS
INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
¾ The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to
alert the user to the presence of un-insulated “dangerous voltage” within the products
enclosure that may be of sufficient magnitude to constitute a risk of electric shock to
persons.
¾ The exclamation point within an equilateral triangle is intended to alert the user to the
presence of important operating and maintenance (servicing) instructions in the
literature accompanying the appliance.
IMPORTANT SAFETY INSTRUCTION-PLEASE READ PRIOR TO PRODUCT INSTALLATION.
1. All of the safety and operating instruction should be read before the amplifier is operated.
Retain these instructions for future reference. All instructions should be followed; all
warnings on the amplifier and in the operating instructions should be adhered to.
2. This amplifier should not be used near water, for example, near a bathtub, washbowl,
kitchen sink, laundry tub, in a wet basement, near a swimming pool, etc.
3. The amplifier should be situated so that its location and position do not interfere with its
proper ventilation. For example; the amplifier must not be placed on a rug, bed, sofa, or
similar surface which impedes airflow across the chassis. Airflow through the ventilation
openings should be unobstructed.
4. Do not place the amplifier near heat sources such as radiators, heat registers, stoves, or
other appliances that produce heat.
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NetStreams Musica Power Amplifier
Safety (continued)
5. The amplifier should only be connected to 120 VAC, 60 cycle grounded power supply.
To avoid defeating the ground polarization of the power plug, do not remove the ground
pin on the plug and check the outlet for correct polarization before plugging in the
amplifier’s power cord.
6. 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
the point where they exit from the amplifier. To prevent risk of fire or injury, damaged
cords and cables should be replaced immediately.
7. Clean the amplifier with a damp cloth. Do not use solvents or abrasive cleaners. Never
pour any liquid on or in the amplifier.
8. Damaged amplifiers requiring service. The amplifier should be serviced by qualified
service personnel when:
the power supply cord or the plug has been damaged.
objects have fallen or liquid has spilled into the unit.
the amplifier has been exposed to rain or other moisture.
the amplifier does not appear to operate normally or exhibits a marked.
the amplifier has been dropped, or the enclosure damaged.
9. The amplifier should be situated so that its location and position do not interfere with its
proper ventilation. For example; the amplifier must not be placed on a rug, bed, sofa, or
similar surface which impedes airflow across the chassis. Airflow through the ventilation
openings should be unobstructed.
10.The user should not attempt to service the amplifier beyond that described in the
operating instructions. All other servicing should be referred to qualified service
personnel.
All specifications subject to change without notification. All rights reserved. Copyright©2004 NetStreams
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NetStreams Musica Power Amplifier
Features
This section of the manual provides an overview of the features that make this amplifier
unique.
Note: Observe proper polarity in interconnecting all system components.
Caution: Do not connect AC power until all other connections are made.
RJ45 Input/output
The amplifier has been designed for the NetStreams product line and has features that
allow for a simple installation and the ability to add more products as they become
available. The RJ45 connection allows an input from the keypads and an output to another
MU290 Power Amplifier or to an Audio Port (EIM). This allows up to six amplifiers to be
linked together off of one Keypad for those large area applications. Maximum
recommended distance between a Musica keypad and the last product (amplifier or Audio
Port) is 75 ft.
Note: The Terminator RJ45 Plug needs to be installed in the Out put connection for the
setting in the Keypad to be set.
All RJ45 terminations for the connection between a Musica 2.0 keypad and the MU290 are
a straight through terminations; meaning that pin 1 goes to pin1, pin 2 to pin 2.
If a 1.0 Musica keypad is used, the chart below describes the termination.
1.0 Keypad
Amplifier
Pin 1
3
4
5
6
7
8
1
2
2
3
4
5
6
N/A
N/A
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NetStreams Musica Power Amplifier
Configuration for Stereo Operation
Input Connections
Run a Cat5e cable from the Keypads Audio Port (EIM) output, to the input of the MU290.
Output Connections
RJ45 Output
The RJ45 Terminator Plug comes installed in the MU290 but can be removed to add
additional MU290’s or an Audio Port. If an Audio Port is not used then the RJ45 Terminator
plug will need to be installed in the last MU290 of the chain. See figure 1.
Speaker Output
Speaker leads connect via a 4 position Phoenix connector. Be sure to match up the polarity
of correctly. (See amp for polarity).
Prepare speaker leads by stripping insulation back 3/16” (6mm). Twist strands together
slightly to ensure that there are no stray strands. Connect to terminals that correspond to
the channel outputs as follows:
Fig. 1
With a small, flat-blade screwdriver, after inserting the speaker wires into the appropriate
hole in the Phoenix connector, tighten the screw until the leads are held securely in place.
Inspect for possible shorts or broken wires.
Check the position of the front-panel Bridged/Stereo Mode Selector Switch. The button
should be in the “out” position. Be sure the power button is off (out), than plug the line cord
into a grounded 120v AC outlet.
The amplifier is now ready for stereo operation.
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NetStreams Musica Power Amplifier
Configuration for Bridged (Mono) Operation
The MU290 Power Amplifier may also be operated as a powerful single-channel amplifier.
This “bridged” mode requires special attention to input and output wiring configurations.
Input Connections
The right and left audio signal will need to be summed together in order to have both
channels play out of one speaker. This will need to be done by the installer. Pins 3 and 4 on
the RJ45 connection will need to be linked together in order to get a mixed mono signal.
Pin Out
Description
IR Out +
IR Ground
1
2
3
4
5
6
7
8
Left Input Audio +
Right Input Audio +
Ground
Audio Logic
Left Output Audio +
Right Output Audio +
Output Connections
Prepare the speaker leads as described on page 3. Insert the stripped leads onto screw
terminals 2 and 4 ONLY (Channel 1 Positive (Becomes the Negative) and Channel 2
Positive). Make no connection to terminal 1 and 3. Inspect for possible shorts or broken
wires.
Depress the front-panel button marked Bridged/Stereo. Push it in as far as it will go. Be
sure the power button is off (out), than plug the line cord into a grounded 120v AC outlet.
The amplifier is now ready for mono operation.
MU290 Input Controls
The input sensitivity of each amplifier channel is adjustable for optimum performance with
any line-level source. Adjustment is achieved by means of screwdriver-adjustment rotary
controls, recessed behind the front panel. With typical program source levels present,
adjust each channel to provide the highest level without distortion. If distortion persists,
check the preceding components. The most noticeable distortion usually occurs in early
stages of the audio system, such as in the source or its cables. Once you have adjusted
the input sensitivity the amplifier will be ready for extended use.
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NetStreams Musica Power Amplifier
Configurations
Keypad to MU290
Keypad to MU290 to Audio Port (EIM)
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NetStreams Musica Power Amplifier
Configurations (continued)
Keypad to first MU290, then serial to (5) more
MU290’s, then terminator on 6th MU290
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NetStreams Musica Power Amplifier
Mounting
Your MU290 amplifier can be easily mounted in one of several ways: 1) on a shelf, 2)
mounted to a wall using the brackets included, or 3) mounting in a cabinet using the
brackets included. Remember that the MU290 will need to be installed in a well ventilated
area.
Special Consideration
¾ Allow ample ventilation; do not enclose the amplifier so air can not move freely around it,
especially above it. If the top of the unit is to be covered, airflow must be provided.
¾ Avoid operating the amplifier in direct, bright sunlight.
¾ Avoid contact with moisture. Don’t plug into a wet amplifier. If moisture is inside the
amplifier, contact NetStreams technical support for further instructions.
¾ Avoid excessive torque on input level controls.
¾ Avoid very dusty environments. A clean amplifier is a happy amplifier
Trouble Shooting
Problem: No Input; LED not lit.
Procedure: IS the amplifier plugged into a live outlet? Is the power switch pushed “IN”?
Disconnect the speaker. If the amplifier turns on after a few seconds delay, the problem is
in the output connection. Check wiring and speakers for short circuits. If amp will not turn
on, return it to your dealer for service.
Problem: No output on one or both channels; LED lit.
Procedure: Check level controls, input terminations, bridge switch, source, input cables,
speaker connector and wiring.
All specifications subject to change without notification. All rights reserved. Copyright©2004 NetStreams
NS-0104-7064
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NetStreams Musica Power Amplifier
Specifications
Frequency Response + 0.5dB
20Hz-20kHz
Bandwidth + 3dB
5Hz-100kHz
Noise (A weighted, any mode)
THD (8OHm) 20Hz-20 kHz at Rated Output
Input Impedance
98dB below full rated output
<0.08%
20kOHm
Input sensitivity for Rated Output (8OHm)
Maximum Output Power,
Stereo
1v
20Hz-20 kHz
50w x 2 @ 8ohm
50w x 2 @ 4ohm
180w x @8 ohm
30 v microsecond
>200/8ohm
Bridged Mono
Slew Rate (Stereo Mode)
Damping Factor
Number of Channels
Input Connectors
Output Connectors
Power Requirements (8OHm/Ch)
Power Supply Design
Dimensions:
2
RJ45 (EIA 568a)
Removable Screw down
120v AC 200W
High Speed Switching
see below
Height
4.4 cm (1.7 in.)
21.6 cm (8.5 in.)
25.9 cm (10.2 in.)
2.5kg. (5.5 lbs.)
Width
Depth
Weight
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Notes
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WWW.NetStreams.com
For additional information or technical support, please call
(512) 977-9393 or email us at [email protected]
3600 W. Parmer Lane Suite 100
Austin, TX 78727
(512) 977-9393 Phone
(512) 977-9398 Fax
email: [email protected]
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