stellar labs DA-250 User manual

DA-250
DA-250
Digital Amplier
Warranty
MCM Electronics warrants to the original purchaser that this amplifier will be free from defects in materials and workmanship for a period of
one year. In the event that warranty replacement is required, the unit will be replaced or repaired at the sole discretion
of MCM
Electronics. Warranty claims must be processed through the MCM Electronics customer service department.
POWER
ON/STANDBY
2 Channel Digital Amplifier
-50-16640
www.mcmelectronics.com
This warranty does not include service or parts to repair damage caused by accident, disaster, misuse, abuse, or improper installation. This
warranty is in lieu of all other expressed warranties. If the product is defective in materials or workmanship as warranted above, the
purchaser’s sole remedy shall be repair or replacement as provided above. In no event will MCM Electronics be liable for any incidental or
consequential damages ari sing from the use of this product.
User Manual’s

2
The lightning ash with arrowhead symbol,
within an equilateral triangle, is intended to alert
the user to the presence of uninsulated dangerous
voltage within the product’s enclosure that may
be of sucient magnitude to constitute a risk of electric
shock to persons.
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.
SAFETY INSTRUCTIONS
CAUTION: TO REDUCE THE RISK OF ELECTRIC
SHOCK, DO NOT REMOVE THE COVER. NO USER-
SERVICEABLE PARTS INSIDE. REFER SERVICING
TO QUALIFIED SERVICE PERSONNEL.
WARNING: TO REDUCE THE RISK OF FIRE
OR ELECTRIC SHOCK, DO NOT EXPOSE THIS
APPLIANCE TO RAIN OR MOISTURE.

This Stellar Labs amplier is designed with special circuitry to safeguard the
This Stellar Labs amplier is designed with special circuitry to safeguard the
Signal-sensing – The DA-250 is in a standby mode when no audio signal is
amplification where needed, either as a standalone amplifier, or as an addition
to a whole-house distributed audio system in order to provide extra amplifier
power in larger rooms or spaces. Its space-saving ½-rack design allows for
quick installation and gives flexibility of mixing and matching with other
½-rack products to save valuable equipment rack space.
The powerful 50-watt class D amplifier in the DA-250 is combined with
features such as 12v trigger control, audio sensing, volume gain adjustment,
and a buffered line output that enables even more amplification of the same
audio signal when needed.
Product Features
Class D amplier – The cool running, low-prole, high eciency design makes
the DA-250 the perfect choice for even the most space-conscious system
designs
50w per channel – A powerful 50watts per channel are available to provide
ample power to even the largest of spaces
Loop Output – A buered loop output is available for the audio signal,
allowing additional ampliers to be easily driven from the same signal
The DA-250 is a 2-channel digital amplier designed to be used to boost audio
3
Introduction
Trigger in/out – The DA-250 can be activated by a 12vdc trigger signal, and can
activate additional devices at the same time
Multiple Turn-on modes:
Always On - The DA-250 is always active and ready for use
present and will turn on when
12v Trigger – Using the 12v trigger allows precise turn on/o when the
amplier is needed, keeping the unit in a power saving standby mode when
not in use
Multiple Output modes:
• 8Ω - optimized mode for 8-ohm stereo output
• 4Ω - optimized mode for 4-ohm stereo output
• Bridge – allows the use of the DA-250 as a powerful, 8-ohm mono amplifer
PRODUCT OVERVIEW
Removable speaker connectors – allow for quick, secure installation and
accommodate cables of up to 12 ga AWG
Cord Lock – Flip-down cord lock keeps the IEC power cord in its place,
preventing accidental disconnection when moving gear in a stack or when
pivoting a rack for service
Thermal Protection
amplier under a thermal overload condition. Thermal protection mode can
only engage when the unit has been run at high volume for extended periods
of time without adequate ventilation and/or when speaker impedances
are below the minimum levels for the amplier. If this fault occurs, turn
o the amplier, and check that the speaker impedance rating is above the
minimum rating. Also check for adequate ventilation around the amplier and
make adjustments if necessary. Once the unit has cooled to safe operating
temperatures, the amplier may be powered back on.
Protection Circuitry
amplier under a short-circuit condition. A faulty speaker can also cause a
short circuit condition. The front panel LED illuminates orange when the
amplier is in short circuit protection. If this fault condition occurs, turn o the
amplier and check speakers for short circuit conditions when appropriate.

switch must be ON.
4
FRONT PANEL CONNECTORS
1Power Button: Power - the front panel switch will
manually switch the power on or o.
2Power/Standby LED: On start-up, the rst LED lights red
to show power on. When the amplier goes into standby,
the LED will light amber. The LED will light green during
normal operation.
3Line In: Analog stereo audio input for a single input
source. When in Bridge Mode, use the "L" audio input for the
input signal.
4Line Out: A buered line out is available to extend the
audio signal to additional ampliers as needed.
5Volume: Use this gain switch to attenuate the volume
level to meet the room's needs.
6Output: The output switch has three positions, Bridge
(mono), 8Ω (stereo), 4Ω (stereo). The default setting is 8Ω.
7Turn-On: There are three turn on-modes: always-on
(On) , audio sensing (Auto) and activated by the 12v Trigger
(Trigger).
812VDC Trigger: Turns on the DA-250 when set to Trigger
mode and a 12vDC signal is received. The Trigger Out
provides 100mA 12VDC max to drive other 12V triggered
devices. When using Trigger mode, the front panel power
9Speaker Out: Connect your loudspeaker(s) here. Up to
12ga AWG wire may be used.
10
AC Input: Use a 3-prong grounded IEC cord. The
locking connector may be engaged to prevent cords from
accidental dislodging in an equipment rack.
AC IN:100v-240v, 50/60Hz 200W
Bridge 4ΩON Trigger
8ΩAUTO
Min Max
R
LL-
L+ R- R+
4/8Ω
SPEAKER
VOLUME
+Briage 8Ω
LINE OUT
IN
OUTPUT SEL. POWER
TRIGGER
IN
OUT
34 5 6 7 8 109
DA-250 Digital Amplier
POWER
ON/STANDBY
1 2

5
The DA-250 can be used in a side-by-side confguration using the optional rack
mounting kit. This feature makes it easy to add amplication to two controllers
or two zones.
The example shown shows three DA-250 units being used to add amplifcation
to a controller. One unit is connected in normal 8 ohm
stereo mode for an additional room and two DA-250 units are shown connected
in Bridge mode to add a very powerful outdoor stereo zone.
UNIT SETUP BRIDGED OPERATION
For the Bridge Mode connect the negative lead (-) of the speaker cable to
the R+ terminal. Connect the positive lead (+) of the speaker cable to the L+
terminal. Set the ouptut switch to Bridge , connect the Line In feed from a
source to the Left Line In connection only and restore power to the amplier.
AC IN:100v-240v, 50/60Hz 200W
Bridge 4ΩON Trigger
8ΩAUTO
Min Max
R
LL-
L+ R- R+
4/8Ω
SPEAKER
VOLUME
+Briage 8Ω
LINE OUT
IN
OUTPUT SEL. POWER
TRIGGER
IN
OUT
Speaker Cable
Connections for bridged mode operationConnections for normal operation
RCA Cable
Multiroom Controller
DA-250 Amplier
Speaker Cables
8 Ohm Speakers
8 Ohm
Speaker
8 Ohm
Speaker
Speaker Cable
AC IN:100v-240v, 50/60Hz 200W
Bridge 4ΩON Trigger
8ΩAUTO
Min Max
R
LL-
L+ R- R+
4/8Ω
SPEAKER
VOLUME
+Briage 8Ω
LINE OUT
IN
OUTPUT SEL. POWER
TRIGGER
IN
OUT AC IN:100v-240v, 50/60Hz 200W
Bridge 4ΩON Trigger
8ΩAUTO
Min Max
R
LL-
L+ R- R+
4/8Ω
SPEAKER
VOLUME
+Briage 8Ω
LINE OUT
IN
OUTPUT SEL. POWER
TRIGGER
IN
OUT
DA-250 Amplier
DA-250 Amplier

50W @ 8 Ohms < 0.1% THD+N
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TECHNICAL SPECIFICATIONS
Continuous Output Power:
65W @ 4 Ohms < 0.1% THD +N
120W Bridged @ 8 Ohms < 0.1% THD+N
Input Trigger: 12VDC 10kohms
Output Trigger: 12VDC 100mA max
Power Requirements:
(Autoswitching Power Supply) 100VAC to 240VAC 50/60Hz 2.5A
IEC 320 type connector with 3 terminal
detachable power cord
Standby Power: <0.5 Watts
Dimensions: 8.5" W x 10.5" D x 1.75" H
Weight: 3.32lbs