Atlas MVXA-2008 User manual

.75 2.25
9.5
.75
1
3
245
12345
Volume
Control
Channel
Select
Control
Channel Visual Indicator LED's
Phone Plug
(3 Watts Unbuffered)
S + -
+- +
Speaker
Out
(3 Watts)
Line Out
Power
15 VAC
-2
-5
-7
-9
-13
-16
-19
-22
-25
-30
+ 3
0
Made in
USA
Peak Response
LED Driver
VU Response
Channel
Audio
Select
Audio
Amp
IN
IN
OUT
dB
dB
Red
LED's
Green
LED's
Blue Power LED
-
OUT
Channel Audio Select
1
4
532
Channel 1-8
or
Channel 1-16
Green LED
MVXA-2008
(8 Channel)
MVXA-2016
(16 Channel)
WARNING! Before using headphone adjust volume.
Headphone jack disengages speaker.
Speaker/
Headphone
Disconnect
25V 70V (Default Setting) 100V Line Level
Jumper Setting 1 & 2 3 & 4 None 4 & 5
Reference Voltage 25 Vrms 70 Vrms 100 Vrms 1 Vrms
Power Ref. into 8 ohms 78 Watts 613 Watts 1250 Watts 0.13 Watts
Power Ref. into 4 ohms 156 Watts 1225 Watts 2500 Watts 0.25 Watts
12 None
34 45
WARNING!
Place jumpers
lengthwise only as
shown in these
diagrams!
Jumpers must be
adjusted before
applying power!
Set Each
Channel's
0
dB Reference
Level
®Atlas Sound
1601 Jack McKay Blvd. Ennis, Texas 7511 U.S.A.
www.AtlasSound.com • Tech Support: 1 800-876-3333
Active Monitor Panel
Size: 1-3/4"H x 9.5"D x 19"W
( 34 x 241 x 482mm )
One Rack Unit
Weight: 7 lbs ( 3.2Kg )
Supply Voltage: 15 VAC power supply
(included)
Channels: MVXA-2008 is 8 channels
MVXA-2016 is 16 channels
Total Harmonic Dist.: <1%
Floor Noise: 76dB
Internal Speaker: 3 Watts / 8 ohm
Power Consumption: 6 Watts
Frequency Response: 35 Hz - 20 kHz
Channel Turn-On Delay: 1 Second
INPUTS:
Available "0dB" References:
Line Level (1 Vrms),
25 Vrms, 70 Vrms,
100 Vrms
LED Display:
Accuracy: 1.5 dB
Sensitivity: -30 dB to +3 dB
Monitoring Range: 0.0316 Vrms
(-30 dBV) to 200 Vrms
Dynamics: Bottom 10: VU Response,
Green (-30 dB to -2 dB)
Top 2: Peak Response,
Red (0 dB to +3 dB)
Audio Outputs:
Line level : Terminals on back
3 Watt amplifier (5 Watt peak) into:
• Internal speaker
• Headphone jack
• External speaker output
(4Ωor 8Ω) terminals
on back
Atlas-Sound Technical Support 1-800-876-3333
www.atlassound.com
MVXA Series Specifications
Side View
(Terminal Cover Shown Detached)
Front View
Rear View
(Terminal Cover Not Shown)
Top View
(Terminal Cover Not Shown)
CH1 CH6CH5CH4
CH3
CH2 CH8 CH7 VOLUME
CH SELECT
POWER
PHONES
ATLAS SOUND
MVXA 2008
9.5"
1.75"
1.25"
.25"
19"
17"
18.312"
1601 JACK MCKAY BLVD. / ENNIS, TEXAS 75119 U.S.A. / TELEPHONE: [phone] / FAX [phone]
Specifications subject to change without notice
© 2000 AtlasSound Printed in U.S.A. 00401 AT000384 PN 484004
9.5"
.75"
.75"
2.25"

MVXA Series
Multi-Channel Amplified Monitor Panel
Users Manual
MVXA-2008
MVXA-2016
Accurate speaker and line level monitoring in a single rack unit!
•8 or 16-channel audible and visual monitoring
•Sophisticated single rack-unit design (1RU)
•Selectable input references of 1Vrms, 25Vrms, 70Vrms, or 100Vrms
•Accurate visual monitoring of all channels simultaneously
•LED's display green or red for easy identification of referenced signal levels
•Internal speaker, headphone jack, line level output, and speaker output
•Multiple patents pending
Specifications subject to change without notice
1601 JACK MCKAY BLVD. / ENNIS, TEXAS 75119 U.S.A. / TELEPHONE: [phone] / FAX [phone]
© 2000 AtlasSound Printed in U.S.A. 00401 AT000384 PN 484004

Isolation
Both MVXA models feature Atlas-Soundolier's exclusive
CerAmpTM technology (patent pending) to isolate noise from
the input channels. Our CerAmpTM design utilizes
ceramic capacitors and an op-amp to achieve high input
impedance isolation without transformers to reduce
distortion ,
hum, and noise.
Mounting Flexibility
The compact design of the MVXA is ideally suited for shelf,
rack, or wall mounting. To facilitate application flexibility,
rack mount brackets may be installed in three different ways
for standard rack or wall mount applications including single
and side-by-side wall orientation.
1
3
245
12345
Volume
Control
Channel
Select
Control
Channel Visual Indicator LED's
Phone Plug
(3 Watts
Unbuffered)
+- +
Speaker
Out
(3 Watts)
Line Out
Power
15 VAC
-2
-5
-7
-9
-13
-16
-19
-22
-25
-30
+ 3
0
Peak Response
LED Driver
VU Response
Channel
Audio
Select
Audio
Amp
IN
IN
OUT
dB
dB
Red
LED's
Green
LED's
Blue Power LED
-
OUT
Channel Audio Select
1
4
532
Channel 1-8 or Channel 1-16
Green LED
WARNING!
Before using headphone
adjust volume.
Headphone jack disengages speaker.
Speaker/
Headphone
Disconnect
S + -
Figure 1 Functional Diagram (as found on top panel plate)
Visual Monitoring
The MVXA Series efficiently monitors from -30 dBV (line level
reference) to 200Vrms (100Vrms reference) . Units are capable
of monitoring any combination of 25V, 70V, 100V, or line level
signal inputs.
( Signal type of each channel is individually set
using adjustable jumpers.) All channels can be visually monitored
simultaneously as each signal has its own twelve segment LED
bargraph that provides 33 dB of resolution. The bottom ten
LEDs are green and have VU ballistic response for -30 dB to -
2 dB. The top two red LEDs have peak response characteris-
tics for 0 dB to +3 dB above reference level to provide easy
identification of critical signal levels.
Audio Monitoring
Audio monitoring methods include: an internal speaker, a head-
phone jack, a 3 watt speaker output for connection to an external
speaker, and a line level output for connection to an amplifier.
Enhanced benefits include:
Compact electronic design achieves 8 or 16 channel
audible & visual monitoring in a single rack space!
Each meter can be individually referenced to Line Level (1Vrms), 25Vrms, 70Vrms, or 100Vrms input to collectively
monitor multiple signal types in any combination
An internal speaker, headphone jack, line level output, and an external speaker output are available for
versatile audio monitoring of each channel
A 12 segment LED meter for each channel provides accurate
visual monitoring of all channels simultaneously
plus...
Green LED's indicate VU ballistics of -30 dB to -2 dB, Red LED's identify when signals peak at 0 dB to +3 dB relative to reference level for
easy identification of critical signal levels
2Atlas Sound

❷
Rack mount (if desired).
Assure proper "Earth Ground"- see paragraph Shields and Grounding located in Back Panel View for detailed information.
❸
Connect each piece of equipment to be monitored to a separate & input terminal
(channel 1-8 or 1-16).
❹
Determine desired audio monitoring method and action.
METHOD ACTION
A. Internal Speaker No Action Required.
B. Headphone Jack Plug in headphone. This automatically bypasses the internal speaker.
C. External Speaker Connect external speaker to and speaker out terminals. If listening to both
internal and external speakers is desired; keep the speaker/headphone disconnect
jumper in the "on" position. If only the external speaker is desired; move the speaker/
headphone disconnect jumper to "off".
D. External Line Level Connect line level source to and line level out terminals. If listening to both
the internal speaker and line level device is desired; keep the speaker/headphone dis-
connect jumper in the "on" position. If only the line level device is desired, move the
speaker/headphone disconnect jumper to "off".
❺
Perform any desired wire management and labeling functions.
❻
Connect the power supply (included) to the MVXA.
❼
Attach rear cover.
❽
Plug the power supply into a 110/120 VAC outlet.
25 V 70V (Default Setting) 100V Line Level
Jumper Setting 1 & 2 3 & 4 None 4 & 5
Reference Voltage 25 Vrms 70 Vrms 100 Vrms 1 Vrms
Power Ref. into 8 ohms 78 Watts 613 Watts 1250 Watts 0.13 Watts
Power Ref. into 4 ohms 156 Watts 1225 Watts 2500 Watts 0.25 Watts
12345
+- +
Speaker
Out
(3 Watts)
Line
Out
Power
15 VAC
-
Channel 1-8 or
Channel 1-16
Speaker/
Headphone
Disconnect
S + -
Shield Connection:
see "Shields
& Grounding" in
Back Panel View
for information.
Connections
for audio
signal
➊
Remove Rear Panel Cover and set jumpers for each input to desired reference
level (25V, 70V, 100V, or line level).
Each channel is independent so that signals of different types can be monitored on the same unit.
MVXA Series Fast Install Overview
12
None
34
45
WARNING!
Detailed MVXA feature tour on the next four pages
Place jumpers
lengthwise only as
shown in these
diagrams!
Jumpers must be
adjusted before
applying power!
Set Each
Channel's
0
dB Reference
Level
+
-
+
-
+-
Atlas Sound 3

Internal Speaker
The internal speaker provides built-in audio monitoring
capability. It may be used in conjunction with other
monitoring methods or bypassed (see examples).
Examples:
1. Headphones may be used to monitor the audio
signal. When headphones are connected to the mini
headphone jack; the internal speaker is bypassed.
2. An external speaker may be connected to the
speaker out terminals for local or remote monitoring.
When an external speaker is connected, both inter-
nal and external speakers will be active. To bypass
the internal speaker, the speaker/headphone discon-
nect jumper may be moved to the "off" position.
NOTE: This also bypasses the headphone jack.
3. An external line level device may be connected
to the line out terminals. When connected, both the
internal speaker and the line level device will be
active. To bypass the internal speaker, the speak-
er/headphone disconnect jumper may be moved to
the "off" position. NOTE: this will also bypass the
headphone jack. (The line level device is not affect-
ed by the unit's volume control).
Rack
Mount
Brackets
Install flush to
front of unit for
use in a stan-
dard 19" EIA
rack or
MVXA Series Front Panel View
Headphone Monitoring
When the mini headphone jack is
utilized, the internal speaker is
automatically bypassed.
Caution: Turn volume level completely
down before plugging in headphones.
High sound pressure levels are possible.
Power Indicator
The distinctive Blue Power TM LED indicates
when the MVXA Series monitor is on.
Output Amplifier
The MVXA Series uses a 3 watt amplifier to
drive the internal speaker, headphone jack,
and/or an external speaker.
4Atlas Sound

Stereo Monitoring
Visual monitoring of stereo signals may be
accomplished by simply connecting left and right
signal connections to separate channels (ex: left
to channel 1, right to channel 2).
NOTE: If simultaneous audible monitoring of
stereo signals is required, two MVXA units are
necessary; one for the left signal and the other
for the right signal.
Audio Monitoring
Channel Selector
Audio monitoring of each channel is accomplished
using a rotary knob that selects one channel at a
time. The LED for the selected channel (located
above the bargraph) will light to indicate which
channel is being monitored. The audio path from
input to output is fully analog, providing signal
integrity to the internal speaker; headphone jack,
external speaker, and/or line level device.
Visual Monitoring LEDs
Monitor panels have eight (MVXA-2008) or sixteen
(MVXA-2016) bargraph displays; one for each
channel. Each display uses twelve, high-quality
and oversized LEDs to provide clear identification
and easy readability from a distance. The meter's
dynamic range is from -30 dB to +3 dB.
The bottom ten LEDs are green and have VU
ballistics similar to a typical analog meter.
Monitoring the range from -30 dB to -2 dB.
The top two LEDs are red to indicate peak
response. They correspond to 0 dB and +3 dB to
indicate short input levels that are above the
specified reference level. This provides immediate
visual warning if signal peaks are above the
reference level.
Top Panel
Functional Diagram
For installation convenience,
the MVXA includes a function-
al operation and jumper set-
ting diagram silkscreened on
the top of the unit.
1
3
245
12345
Volume
Control
Channel
Select
Control
Channel Visual Indicator LED's
Phone Plug
(3 Watts Unbuffered)
S + -
+- +
Speaker
Out
(3 Watts)
Line Out
Power
15 VAC
-2
-5
-7
-9
-13
-16
-19
-22
-25
-30
+ 3
0
Made in
USA
Peak Response
LED Driver
VU Response
Channel
Audio
Select
Audio
Amp
IN
IN
OUT
dB
dB
Red
LED's
Green
LED's
Blue Power LED
-
1601 Jack McKay Blvd. / Ennis Texas 75119 U.S.A.
www.Atlas-Sound.com Tech Support: 1-800-876-3333
Active Monitor Panel
OUT
Channel Audio Select
1
4
532
Channel 1-8
or
Channel 1-16
Green LED
MVXA-2008
(8 Channel)
MVXA-2016
(16 Channel)
WARNING! Before using headphone adjust volume.
Headphone jack disengages speaker.
Speaker/
Headphone
Disconnect
25V 70V (Default Setting) 100V Line Level
Jumper Setting 1 & 2 3 & 4 None 4 & 5
Reference Voltage 25 Vrms 70 Vrms 100 Vrms 1 Vrms
Power Ref. into 8 ohms 78 Watts 613 Watts 1250 Watts 0.13 Watts
Power Ref. into 4 ohms 156 Watts 1225 Watts 2500 Watts 0.25 Watts
12 None
34 45
WARNING!
Place jumpers
lengthwise only as
shown in these
diagrams!
Jumpers must be
adjusted before
applying power!
Set Each
Channel's
0
dB Reference
Level
ATLAS SOUND®
Volume Knob
Adjusts the output volume to the internal speaker,
headphone jack, and/or external speaker. (The
external line level output is not affected by this knob).
NOTE: When using headphones for audible
monitoring, make sure you adjust completely
down (counter clock wise) and then adjust volume
up accordingly.
Atlas Sound 5

MVXA Series Back Panel View (Rear Panel Cover Removed)
Lacing Rail
The MVXA's bottom panel includes
many wire management features.
Holes are located along the back
of the panel for tie wrapping.
These holes are spaced 2" apart
to allow the use of readily available
hardware handles or lacing bars.
There is also a 3/4" opening along
the entire length of the bottom
panel for wire access. The rear
panel cover is also equipped with
knockouts on either end for wire
management.
Line Level Out
Terminals
The MVXA includes a line level
output. The output of the line level
device is not affected by the volume
control.
Speaker Out
Terminals
An external speaker may be con-
nected to the speaker out terminals
for local or remote monitoring. The
external speaker may be operated
with or without the internal speaker
(see internal speaker examples on
the Front Panel Tour). The output
level is adjusted by the front
volume
control. The external speaker level
output is rated at 3 watts into 8 ohms
with a minimum 4 ohm load.
Shields
and Grounding
The MVXA requires a solid "earth ground" connection. The
unit itself is internally grounded from the circuit board to the
chassis and should receive a good "earth ground" under most
mounting conditions. If the unit is not rack mounted or the
powder-coat paint is interfering with the case grounding, then
one of the "S" ground screw terminals should be taken directly
to earth ground.
Grounding is by nature complex and often requires a variety of options.
If the direct connection to earth ground is not desired. Contact technical
support on how to properly break the shield to earth ground connection.
Power Input
The MVXA Series requires a
15-20 Volt AC or DC power
supply. A 15 VAC table top supply
is included with the unit. The
provided power supply may only
be connected to a 110-120 VAC
power receptacle.
Speaker / Headphone
Disconnect Jumper
When an external speaker or line level
device is connected, the internal speaker
and headphone jack continue to operate.
If this is not desired, the speaker/head-
phone disconnect jumper may be moved to
the offposition to bypass the
internal speaker
and headphone jack. See Internal Speaker
Examples on the
Front Panel View.
6Atlas Sound

Jumpers
Jumpers are to be adjusted prior to applying
power to the MVXA monitor panel. Jumpers
have an extended tab for ease of placement.
Always put the jumpers on the same numbers.
EX: 1 & 2, 3 & 4, or 4 & 5. No jumpers are used
for the 100 volt input setting.
Terminal Inputs
Each of the unit's eight or sixteen channel inputs is
independent allowing audio and visual monitoring of any
combination of 25V, 70V, 100V, and line level circuits.
Each channel provides level indication and is selectable
to a "0" dB reference through easily accessible jumpers.
The available references are shown in Figure 2.
Since each channel is independent, the MVXA can
monitor multiple signal types. For example: Ch1 could
be a line level, Ch2 the 70V output from an amplifier,
Ch3 a line level from another source, etc
.
The default setting for all channels is 70V.
Rear Panel Cover
(not shown)
The protective rear panel cover should be placed on the
unit after wiring to avoid accidental contact with rear
terminals. The cover has knockouts on each end to help
with wire management.
Figure 2
Choose jumper settings to match desired 0 dB reference (25V, 70V, 100V, or line level).
25V 70V (Default Setting) 100V Line Level
Jumper Setting 1 & 2 3 & 4 None 4 & 5
Reference Voltage 25 Vrms 70 Vrms 100 Vrms 1 Vrms
Power Ref. into 8 ohms 78 Watts 613 Watts 1250 Watts 0.13 Watts
Power Ref. into 4 ohms 156 Watts 1225 Watts 2500 Watts 0.25 Watts
12 None
34 45
WARNING!
Place jumpers
lengthwise only as
shown in these
diagrams!
Jumpers must be
adjusted before
applying power!
Set Each
channel's
0
dB Reference
Level
Atlas Sound 7