Leon OTO MCA 200 User manual

715 W. Ellsworth Road Ann Arbor, Michigan 48108 | 1.888.213.5015 | www.leonspeakers.com
OTO MCA 200
USER GUIDE

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OTO MCA 200 USER GUIDE 21
WARNING:
To reduce the risk of fire or electric shock, do not expose
this apparatus to rain or moisture.
The apparatus shall not be exposed to dripping or splashing and no objects
filled with liquids, such as vases, shall be placed on apparatus, receptacles,
and the point where they exit from the apparatus.
The lightning flash 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 sufficient magnitude to
constitute a risk of electric shock to persons.
This symbol is intended to alert the user to the presence of important
operation and maintenance (servicing) instructions in the literature
accompanying the appliance.
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth.
7. Do not block any ventilation openings. Install in accordance with the
manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, stoves or any
other apparatus (including amplifiers) that produce heat.
9. Protect the power cord from being walked on or pinched particularly at
plugs, convenience receptacles, and the point where they exit from the
apparatus.
10. Only use attachments/accessories specified by the manufacturer.
11. Do not ‘Hot Plug’. When changing inputs or outputs, switch the Leon
OTO MCA 200 off before making changes. Once changes have been
made, then switch the Leon OTO MCA 200 back.
12. Unplug this product during lightning storms or when unused for long
periods of time.
13. Refer all servicing to qualified service personnel. Servicing is required
when the apparatus has been damaged in any way, such as power-
supply cord or plug is damaged, liquid has been spilled or objects have
fallen into the apparatus, the apparatus has been exposed to rain or
moisture, does not operate normally, or has been dropped.
14. This apparatus shall not be exposed to dripping or splashing, and no
object filled with liquids, such as vases or glasses, shall be placed on
the apparatus.
15. Exposure to high sound pressure levels may lead to permanent
hearing loss. Take every precaution to protect your hearing.
16. The remote control comes with a non-rechargeable Lithium battery
installed. Take every precaution when handling and installing new
Lithium batteries, and follow all local and state guidelines for safe
disposal of old batteries. Keep all batteries away from children.
Caution: to reduce the risk of electric shock, do not disassemble the
apparatus. There are no user-serviceable parts inside. Refer servicing
to qualified personnel.
Recycling notice: Always properly dispose of or recycle your end-of-life
electronic products. Contact your local or state recycling authorities
for information on nearby recycling facilities.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
ATTENTION
RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR
SAFETY INSTRUCTIONS

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OTO MCA 200 USER GUIDE 43
WELCOME
INTRODUCTION 5
UNPACKING 5
IR REMOTE CONTROL TOUR 6
AMPLIFIER TOUR (FRONT PANEL) 7-8
AMPLIFIER TOUR (LEFT PANEL) 9
AMPLIFIER TOUR (RIGHT PANEL) 10
AMPLIFIER DIP SWITCH CONTROL 11-12
INSTALLATION 13
CONNECTIONS 14
QUICK START 2.0/STEREO SET UP 15-16
BRIDGED MONO 2.0 LINKED SETUP 17-18
STEREO SETUP WITH A PASSIVE SUBWOOFER 19-20
STEREO SETUP WITH A POWERED SUBWOOFER 21
BRIDGED MONO 2.0 WITH POWERED SUB 22
ADJUSTING THE ACCUBASS® 22
DEFAULT VOLUME BYPASS PROCEDURE 23
IR LEARNING PROCEDURE 23-24
FRONT PANEL LED DISABLE 25
ADDITIONAL FEATURES & SUPPORT 26
TROUBLESHOOTING 27
SPECIFICATIONS 28
WARRANTY 29-30

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OTO MCA 200 USER GUIDE 65
INTRODUCTION
UNPACKING
Remove the OTO MCA 200 from its packaging and inspect it for any shipping
damage. If you discover damage, contact your Leon dealer or a customer
service representative immediately.
If possible, save the carton and internal packaging. It is the best possible
protection for your OTO MCA 200 if you need to move it or return it for service.
Keep your sales receipt in a secure place. It helps establish the duration of
your warranty and is good for insurance purposes in case anything happens
to your equipment.
PACKAGE CONTENTS
• Leon OTO MCA 200 Amplifier
• OTO MCA 200 IR Remote Control
• AC Power Cord
Congratulations on your purchase of a Leon OTO MCA 200. This was
developed in collaboration with AudioControl®, 40-year veterans of the
performance-audio amplifier industry. The features of the OTO MCA 200
allow it to shine in both analog and digital audio systems, whether in an
audiophile stereo system, a home theater, or a commercial environment.
The amplifier includes a high-performance Wolfson® DAC (digital to analog
converter), and comfortably delivers 100 watts per channel at 8 ohms, 200
watts per channel at 4 ohms, or up to 400 watts bridged.
Additionally, the amplifier features options for control via IR remote, or via
RS232 for easy integration with third-party control systems. With integrated
switchable crossovers, multiple OTO MCA 200 amplifiers can be combined to
drive passive 2.1 systems. The AccuBASS® function allows detailed control
over bass response to help simplify speaker placement and tuning of the
room.
This manual will take you step-by-step through the features and operation of
the OTO MCA 200. Please read it thoroughly and carefully to ensure that you
get maximum performance from the OTO MCA 200. Keep this manual in a
safe place in case you need to refer to it in the future.
• Optical Cable
• 4-pin and 3-pin Euroblock terminal blocks
• Mounting Kits (optional)
IR REMOTE CONTROL TOUR
A. Power On/Standby: Press this to awake the OTO MCA 200, or put it into
standby mode. In standby, the OTO MCA 200 will use minimal electricity.
During normal operation, the OTO MCA 200 will enter standby if no input
signal is sensed for about 8 minutes. This auto-standby mode can be
disabled using the Sleep Defeat DIP switch (see Pages 11-12). If the Power
On/Off switch is off, the amplifier will not turn on with the remote control.
B. Volume Up/Down: Press the plus button to increase the volume, and
the minus button to decrease the volume.
C. Mute: Press this button to mute or unmute the amplifier output.
D. Input Selection 1, 2, 3: Press these buttons to select the desired input.
The OTO MCA 200 front panel LED will light to reflect the selected input.
E. Headphones On/Off: Press this to turn on/off the OTO MCA 200
headphone output. All other outputs will be muted and the front panel
headphone LED will light when the headphone output is engaged.
F. AccuBASS® Up/Down: Press the arrows to increase or decrease the
amount of AccuBASS® enhancement.
G. AccuBASS® On/Off: Press this to turn on the AccuBASS® enhancement.
The front panel input LED will glow brighter when AccuBASS® is enabled.
H. Battery Compartment: The battery compartment on the back is
opened by pressing and sliding off the small cover. Remove a small
insulating strip from below the battery before first use. Always replace the
battery with the exact same type (3V lithium CR2032), and with the positive
(+) side facing outward.
A.
B.
C.
D.
E.
F.
G. H.

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OTO MCA 200 USER GUIDE 87
AMPLIFIER TOUR (FRONT PANEL)
3. Input Selection LEDs: These three LEDs indicate which input is selected.
Inputs 1 and 2 are digital inputs, and input 3 is analog. When the OTO MCA
200 is muted, all input LEDs will be off. When the OTO MCA 200 receives
a command from the IR remote or via RS232, the input LED will flash. The
selected input LED glows dimly under normal conditions, and brighter when
the AccuBASS® setting is enabled.
4. Headphone On/Off LED: This LED indicates if the OTO MCA 200
headphone output is enabled. When the headphone output is turned on,
all other outputs from the amplifier are muted. The headphone output is
controlled via the IR Remote.
1. IR Remote Control Window: This is the IR sensor for the included IR
remote. Point the remote in this direction to control the amplifier. Do not
block this port if the IR remote is to be used.
2. On/Standby LED: This LED indicates the power status of the OTO MCA
200.
• Blue – normal operation
• Dim Red – standby mode
• Bright Red – channel mute on power up
• Bright Red 2 – amplifier in protection (see TROUBLESHOOTING, Page 26)
• Flashing Red – speaker fault (see TROUBLESHOOTING, Page 26)
1. 2. 3.
4.

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OTO MCA 200 USER GUIDE 109
AMPLIFIER TOUR (LEFT PANEL)
5. AC Input
6. Power On/Off Switch: This is the master power switch for the OTO
MCA 200 amplifier. Keep the amplifier off while making connections or
disconnections from the amplifier. Use this switch to turn the amplifier
off if it will not be used for long periods of time.
7. Voltage Selection Switch: Ensure this is set to your region-specific line
voltage before plugging in the OTO MCA 200.
8. RS232 Control Input: Use this terminal block to connect a third-party
control system. The pins are as follows:
• Pin 1 – RX (RS232 receive)
• Pin 2 – Ground
• Pin 3 – TX (RS232 transmit)
9. Amplifier Control DIP Switches: These DIP switches affect the operation
of the amplifier. See Pages 11-12 for more details.
10. Speaker Outputs: Use this Euroblock terminal block for connections to
your speakers. Make a note of the polarity markings and ensure they match
those of your speakers (+ to +, - to -).
11. IR Output: This 1/8” jack allows a remote IR sender to be connected.
12. Bridged Mono Output: When the OTO MCA 200 is in bridged mode, this
RCA connector outputs the signal from the active input’s right channel only.
It is affected by the volume level, AccuBASS® level, and the 80Hz low-pass
crossover.
13. Headphone Output: A pair of stereo headphones can be connected
to this 1/8” jack. This output is normally off except when turned on remotely.
14. Digital Input 2 Coax/Optical: Digital Input 2 automatically switches
between Coaxial and Optical depending on what is connected. Use either
Coaxial or Optical, but not both.
15. Digital Input 1 Coax/Optical: Digital Input 1 automatically switches
between Coaxial and Optical depending on what is connected. Use either
Coaxial or Optical, but not both.
16. Analog Input 3 L/R: These RCAs are the left and right inputs for Analog
Input 3. If the OTO MCA 200 is used in bridged-mono mode, use the left input only.
17. +12V Trigger Input: This 1/8” TS jack allows the amplifier to be triggered
on by a 12VDC control system. The unit will remain on as long as the 12VDC
is applied.
18. Sub/Mono Out: Under normal operation, this RCA provides a signal that
is the sum of the active left and right inputs. It is affected by the volume level,
AccuBASS® level, and the 80Hz low-pass crossover. When the OTO MCA 200
low-pass crossover has been enabled, this RCA connector provides 80Hz
low-pass signal, summed from the active left and right inputs.
19. IR Input: This 1/8” jack allows a remote IR receiver to be connected.
20. Crossover/Bridged LEDs: These LEDs indicate the operation of the internal
crossover and bridged-mode settings. They are on when the respective functions
are enabled via the DIP switches (Pages 11-12).
AMPLIFIER TOUR (RIGHT PANEL)
5.
8.
6.
9.
7. 11. 12.
18.
19.
20.
13.
17. 16.
14. 15.
10.

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OTO MCA 200 USER GUIDE 1211
AMPLIFIER DIP SWITCH CONTROL
DIGITAL 1 VOLUME DEFEAT – This switch should
be engaged when it is desirable to control the
volume of channel 1 from an external source
only, such as the volume control on an iPod,
tablet, etc. Only the volume control is defeated.
DIGITAL 2 VOLUME DEFEAT – This switch should
be engaged when it is desirable to control the
volume of channel 2 from an external source
only, such as the volume control on an iPod,
tablet, etc. Only the volume control is defeated.
ANALOG 3 VOLUME DEFEAT –This switch should
be engaged when it is desirable to control the
volume of channel 3 from an external source
only, such as the volume control on an iPod,
tablet etc. Only the volume control is defeated.
HIGH GAIN – When this is engaged, the OTO MCA
200 provides an additional 10dB of gain for use
with Analog input 3. This helps analog sources
with very low signal output to operate optimally
when playing back music with quiet passages.
This switch should not be engaged when the
OTO MCA 200 is being used as a ‘Link Amplifier’.
(See Pages 17-18)
SLEEP DEFEAT – This prevents the OTO MCA
200 from automatically going into standby
mode, and defeats signal-sensing. Obeys IR
and RS232 commands, and the front panel
blue LED will remain blue constantly indicating
normal operation. For optimal energy savings,
this switch should be left in the up (Off) position
and the OTO MCA 200 will detect signal on any
of the three inputs and turn on automatically. If
no signal is present, the unit will go into standby
after 8 minutes.
80Hz HP – Internally applies a 80 Hz high pass
signal to the left and right speaker-level out-
puts. Normally used when employing a separate
subwoofer where the OTO MCA 200 plays just
the 80 Hz high-pass frequency range in the main
speakers. Ideal for sound-bars and subwoofers.
The green high pass LED on the rear panel will
light when this switch is engaged.
80Hz LP – Changes the sub/mono output from
a full-range summed mono left/right signal to
a summed mono 80 Hz, 18 dB per octave, low
pass signal. Normally used if a subwoofer does
not have a built in crossover. The green low
pass LED on the rear panel will light when this
switch is engaged.
BRIDGED* – Internally routes the left signal of
the selected channel to the speaker outputs,
and the right signal of the selected channel
to the bridged mono output. The green bridged
LED on the rear panel will light when this
switch is engaged.
*Note: For an OTO MCA 200 to be used as a Link
unit, set the 3 volume defeat switches and the
bridged switch all ON. In this way, the Link unit
is not affected by the remote control. It will only
affect the Master unit.
Default Settings – The default state of the OTO
MCA 200 is all switches “OFF”
ON
Volume
Defeat
Sleep
Defeat
Bridged 80 HzLP 80 HzHP Sleep Def. High Gain Analog 3 Digital 2 Digital 1
Sleep
Defeat
ON
Volume
Defeat
Bridged 80 HzLP 80 HzHP Sleep Def. High Gain Analog 3 Digital 2 Digital 1
Sleep
Defeat
ON
Volume
Defeat
Bridged 80 HzLP 80 HzHP Sleep Def. High Gain Analog 3 Digital 2 Digital 1
Sleep
Defeat
ON
Volume
Defeat
Bridged 80 HzLP 80 HzHP Sleep Def. High Gain Analog 3 Digital 2 Digital 1
Sleep
Defeat
ON
Volume
Defeat
Bridged 80 HzLP 80 HzHP Sleep Def. High Gain Analog 3 Digital 2 Digital 1
Sleep
Defeat
ON
Volume
Defeat
Bridged 80 HzLP 80 HzHP Sleep Def. High Gain Analog 3 Digital 2 Digital 1
Sleep
Defeat
ON
Volume
Defeat
Bridged 80 HzLP 80 HzHP Sleep Def. High Gain Analog 3 Digital 2 Digital 1
Sleep
Defeat
ON
Volume
Defeat
Bridged 80 HzLP 80 HzHP Sleep Def. High Gain Analog 3 Digital 2 Digital 1
ON
Volume
Defeat
Sleep
Defeat
Bridged 80 HzLP 80 HzHP Sleep Def. High Gain Analog 3 Digital 2 Digital 1

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OTO MCA 200 USER GUIDE 1413
The Leon OTO MCA 200 is a compact, yet powerful amplifier and requires
some consideration regarding installation to ensure the highest level of
performance. The OTO MCA 200 uses efficient switching power supplies
and Class D amplification, but it is an amplifier and does require ventilation.
Intake and exhaust vents are supplied on the top and bottom of the unit, and
the OTO MCA 200 should not be mounted in a way which blocks these vents.
The OTO MCA 200 may run warm during operation; this is normal and does
not represent a faulty unit.
• When mounting the OTO MCA 200, avoid areas where it will be exposed
to direct sunlight or sources of heat or moisture.
• Do not mount the OTO MCA 200 directly above or below another power
amplifier or source of heat – leave a gap for airflow.
• Do not mount the OTO MCA 200 in an enclosed space unless there are
provisions for ventilation.
CABLES
To ensure the highest performance from all components in your audio
system, use high-quality analog and/or digital audio cables. Keep cables as
short as possible. Power cables should be routed away from audio cables if
possible.
INSTALLATION
SPEAKERS AND CONNECTIONS
As a stereo amplifier, the Leon OTO MCA 200 is designed to work with 8 ohm
and 4 ohm speakers, or combinations of speakers that appear as 8 ohms or 4
ohms to the amplifier. In bridged mode, the minimum impedance is 8 ohms.
When you wire two speakers in series (+ to -), impedances add. Two 4 ohm
speakers wired in series will appear as an 8 ohm impedance to an amplifier.
When you wire two speakers in parallel (+ to +, - to -), the overall impedance
drops. For two 8 ohm speakers, the parallel impedance is calculated as follows:
1/8 + 1/8 = 2/8
Now take the inverse of the result = 8/2
8/2 = 4/1 = 4 ohms
In summary, make sure to calculate the impedance of speakers when you are
hooking multiple together to ensure that the amplifier is not overloaded.
When wiring a speaker system, establish and follow a standard color code.
Speaker wire is marked on the jacket with a color, or perhaps the two
conductors are different colors (silver vs. copper). Using your color code
system, ensure that the speakers are wired with polarity matching the
OTO MCA 200 output.
Speaker wire gauge and the length of the runs can affect the performance
of your system, so choose the appropriate size wire for the application. Small
wire gauges, even over short distances, can add significant resistance to the
system and reduce the power reaching the speakers.
CONNECTIONS

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OTO MCA 200 USER GUIDE 1615
If you’re listening with a pair of full range speakers only, connecting your OTO
MCA 200 is simple. Follow the steps below to start listening right away. Refer
to the AMPLIFIER PANEL TOUR, Pages 7-10, for location of connections.
QUICK START – 2.0/STEREO SETUP
RIGHT PANEL
LEFT PANEL
1. Connect one or more sources to the analog or digital inputs of the OTO
MCA 200. Each digital input can support either a Coaxial or Optical input,
but not both simultaneously.
2. Using the provided terminal blocks, connect your speakers to the
Speaker Outputs, noting correct polarity.
3. Plug the OTO MCA 200 into the AC outlet with the included AC power
cord.
4. Turn on the OTO MCA 200 power switch.
5. Using the IR remote control, select the source you have connected to the
OTO inputs.
6. Using the IR remote control, adjust the volume to the desired level.
7. If needed, activate the AccuBASS® by pressing its button on the IR
remote control. Use the arrows on the remote to adjust the AccuBASS®
level to your music.

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OTO MCA 200 USER GUIDE 1817
BRIDGED MONO 2.0 LINKED SETUP
The Leon OTO MCA 200 can operate in bridged mono mode in which it can
produce up to 400 watts into 8 ohms. A pair of OTO MCA 200 amplifiers used
as monoblocks can therefore supply a total system power of 800 watts,
enough to drive even the most power-hungry HIFI speakers.
The first OTO MCA 200 operates as the ‘master’, where all source connections
and volume adjustments are made. The ‘master’ powers the left channel
speaker. The second OTO MCA 200 is the ‘linked’ unit, receiving the right
channel audio from the ‘master’.
RIGHT PANEL
MASTER AMPLIFIER (LEFT) LINKED AMPLIFIER (RIGHT)
RIGHT PANEL
LEFT PANEL
LEFT SPEAKER RIGHT SPEAKER
LEFT PANEL
ON
Volume
Defeat
Sleep
Defeat
Bridged 80 HzLP 80 HzHP Sleep Def. High Gain Analog 3 Digital 2 Digital 1
ON
Volume
Defeat
Sleep
Defeat
Bridged 80 HzLP 80 HzHP Sleep Def. High Gain Analog 3 Digital 2 Digital 1
ON
Volume
Defeat
Sleep
Defeat
Bridged 80 HzLP 80 HzHP Sleep Def. High Gain Analog 3 Digital 2 Digital 1