Morel MPS LIMITED Series User manual

MPS LIMITED SERIES
Owner’s manual
MPS 2.150 Limited
MPS 1.1100 Limited

Thank you for selecting Morel’s 45th anniversary MPS Limited amplifiers
to power your system. These two special amplifier models were
designed with the same passion and innovative philosophy that drives
all of Morel’s product development. With an emphasis on high fidelity,
the unique design and superior componentry provide the MPS Limited
the ability to power speakers with precise detail and an engaging
musical experience few other amplifiers can produce. Their high-power
output design makes them a dynamic and powerful experience for
anyone seeking audiophile levels of performance.
Before installation, it is very important to reference the following manual
to ensure safe and optimal operation of the amplifier. There are many
parameters that needs to be taken into consideration when installing an
amplifier to safeguard that the car’s electrical system is not
compromised in any way and the sound system is tuned properly. Morel
highly recommends having your new MPS Limited amplifier
professionally installed by an authorized Morel retailer.
PRODUCT REGISTRATION
Please take the time to locate the warranty registration card for your new
MPS Limited amplifier. This contains instructions on how to register your
product with Morel and includes the serial number as well as a unique
warranty card number for your product.
Dear Customer,

MPS LIMITED
Package content
Practice Safe Sound!
X1
Available Accessories
PLEASE MAKE SURE TO CAREFULLY READ AND UNDERSTAND
ALL INSTRUCTIONS PRIOR TO INSTALLATION
- MPS-STKP stacking plates kit for MPS
Limited amplifiers
- MPS-R1 subwoofer remote level control
(MPS 1.1100 only)
- MPS-HL high-low level adaptor with 50-ohm
load resistor
The MPS Limited amplifiers are designed to work with a 12VDC electrical
system with negative ground. Use of this product in vehicles with positive
ground and/or voltages other than 12V may result in damage to the product
and/or vehicle and will void the warranty.The MPS Limited amplifiers are
designed to work with a 12VDC electrical system with negative ground. Use
of this product in vehicles with positive ground and/or voltages other than
12V may result in damage to the product and/or vehicle and will void the
warranty.
Studies have shown that continuous exposure to high sound pressure levels
from high power audio systems can lead to permanent hearing loss.
Additionally, high volume levels can obscure noises from outside your vehicle
such as emergency vehicles and horns. As a valued Morel customer, we urge
you to use common sense and practice restraint in the operation of this
product.
Precaution
X1
2mm
X4 X2X1
2.5mm
X1
4mm

Mounting the amplifier
Mounting
Choose a location for the amplifier with ample ventilation for optimum
cooling performance. Be sure the amplifier is mounted with at least 2-inches
(50mm) of clearance around the chassis. Never fully enclose the amplifier in
a confined space without active ventilation. Also avoid mounting in areas of
direct sunlight and in areas of high vibration, such as a subwoofer
enclosure. Ideal mounting consists of the chassis being mounted with the
base of the amplifier parallel with the floor or perpendicular to the floor with
the fins of the heatsink facing upward for the most effective heat dissipation.
Your amplifier should always be installed in a location that will remain free
of moisture and dirt, and in a manner that does not interfere with any of the
electronics or safety gear of the vehicle.
For safety purposes, be sure to take the time to properly mount the
amplifier using suitable mounting hardware so the amplifier stays stationary
in the event of a collision or unforeseen circumstance.
Plate location for normal mounting

Plate location for discreet mount
Plate location for parcel shelf mounting
Mounting

MPS-STKP stacking plates
The MPS Limited chassis also allow for amplifiers to be stacked using the
optional MPS-STKP stacking plates (see illustration). When using the
stacking plates, it is recommended the base amplifier be securely mounted
with a nut and bolt to a non-movable portion of the vehicle. Morel also
recommends no more than two amplifiers to be stacked for safety.
Mounting

Protection
Protection
Please note that there are no chassis mounted fuses on the MPS Limited
amplifiers. Instead these amplifiers use a sophisticated microprocessor
controlled protection circuit which enables the amplifier to optimize the
current flow coming into the power supply. This design reduces loss within
the circuitry, increases efficiency and improves sound dynamics of the
amplifier for the best listening experience. However, for the safety of you
and your vehicle, please follow instructions for installing an inline fuse (not
included) with your MPS Limited amplifier.

Planning and Installation
For best results, determine the best configuration of your new amplifier and
plan the wiring routes to ease installation and optimize performance.
• IMPORTANT! Disconnect the vehicle’s primary ground terminal from the battery
post prior to commencing the installation.
• Make sure the mounting location you chose for the amplifier does not interfere with
any functions of the vehicle mechanics and/or electronic devices. Also, be aware of
the locations of the gas tank, wiring harnesses, fuel and brake lines, and other vital
components of the vehicle prior to drilling any holes in the vehicle’s chassis.
• Select high quality signal cables and proper wire. It is highly recommended to use
100% OFC (oxygen free copper) power and speaker wire of proper size for best
performance and longevity of the product.
• Do not run power or audio cables on the exterior of the vehicle as this can result in
severe damage to the vehicle and person.
• Avoid running power and audio cables next to sensitive electronics within the
vehicle, and avoid crossing the signal cables with the power cables.
•Always use rubber grommets when running wire through metal walls or barriers. Use
loom to protect the cable from sharp edges or areas of high heat.
• Power amplifiers place an increased load on the electrical charging system. A
modern vehicle’s factory electrical system should be able to standup to the extra load
of an MPS Limited amplifier without concern. However, multiple amplifier systems can
draw excess current and create a strain on the electrical system. It is best to consult
your audio specialist for advise on whether or not it is necessary to upgrade your
electrical system to meet the demands of the audio system.
• Place an insulated in-line fuse holder (not included) of the appropriate current
capacity (see specifications) within 16 inches (40cm) of the battery positive (+)
terminal. This is to be connected to the (+) power cable connecting the amplifier. Only
install the fuse once the power cable has been secured to the amplifier.
• Locate a solid metal area close to the amplifier to connect the ground wire terminal.
Use the same gauge wire for ground as for the power wire. The length of the ground
wire should not exceed 36 inches (90cm) from the amplifier. To ensure a solid
connection, remove surface paint at the ground point prior to securing the connector
in place.

Power Status Indicator
The ON LED will illuminate blue when amplifier is properly powered on.
Protection Status Indicator
The PRT LED will illuminate red if the amplifier faults and goes into protect mode.
There are several reasons that could cause that amplifier fault including over
current, over or under voltage, short circuit,
thermal protection, or an internal error within the amplifier. If the fault is caused by
thermal protection, the amplifier will reset automatically once the heatsink has
cooled to about 70°C (160°F). If the PRT LED stays illuminated, the power status
LED will flash a code indicating the potential issue. See Fault Code at rear of
manual.
Negative Chassis Ground Connection
Connect an 8 gauge or larger OFC (oxygen-free copper) wire for ground (same
gauge used for +12V power wire). The length of the ground wire should not exceed
36 inches (90cm) from the amplifier. To ensure a solid connection, remove surface
paint at the ground point prior to securing the connector in place.
Remote Turn-On Connector
Connect to wire lead from a switched +12V source. This could be a remote turn on
lead from a head unit or switched ignition lead. If neither of these sources is
available, switch Turn On Mode to signal sensing or DC offset (see #10)
1
2
345 67 8 9
10
12
11
Rem
Offset Signal MIN MAX
Input
Level
Turn on
Mode
MIN MAX
Input
Level
CH1 CH2
High
Current High Power
1
2
345 67 8 9
12
10 11
1
2
3
4
MPS 2.150 LIMITED - Features

5
8
9
7
6
+12VDC Power Connection
For optimum performance, connect an 8 gauge or larger OFC (oxygen-free copper)
wire to the +12V terminal. This wire should be connected directly to the positive
terminal (+12V) of the car’s battery in conjunction with a 30 amp inline fuse. For safety
purposes, the fuse must be located within 16 inches (40cm) of the battery.
Channel 1 & 2 Speaker Outputs
Connect speaker wire up to 10 gauge. Channel 1 and 2 connections can be
configured in stereo using the + and – of both channel outputs, or in a bridged
configuration using CH1 + and CH2 -.
High Power/High Current Mode Indicator
This amplifier has a High Power and High Current power mode. Two LEDs are used
to indicate what mode the amplifier is in (refer to #12 for Mode Selection). When
High Power mode (default) is selected, the LED marked H/P will illuminate BLUE.
When High Current mode is selected, the LED marked H/C will illuminate YELLOW.
RCA Inputs
Accepts both low-level and high-level signal via RCA style connectors. Use the Input
Voltage Selector (refer to #9) to choose appropriate voltage level.
High/Low Level Input Voltage Selector
Select signal input voltage based on the signal source used. When using an
aftermarket radio, DSP or line level convertor, select Low for levels up to 4V. When
using high-level input from an amplified factory audio system, select High for levels
up to 8V. High-level inputs require the MPS-LC line level adaptor (sold separately) to
convert amplified speaker outputs from factory audio systems to RCA style
connections.
Turn-on Mode Selector
Select between 3 modes to turn on the amplifier. When using a switched lead such
as the +12v remote output of a radio, use the default position REM. When
connecting to a factory audio system or alternative source, select Signal and the
amplifier will turn on when it senses voltage through the inputs. DC (DC offset) may
be used in some vehicles where signal sensing does not reliably turn the amplifier
on.
10
MPS 2.150 LIMITED - Features

11
12
Input Level
This amplifier has two input level (gain) adjustments – one for Channel 1 and one
for Channel 2. These are used to properly match input levels with the source signal
to optimize the amplifier outputs. THEY ARE NOT A VOLUME CONTROL! To set
properly, the maximum unclipped output from the radio or source must be known
using proper test equipment. The input level adjustments can then be properly set
to maximize output without overdriving the amplifier. If the gain is not set properly
the amplifier may clip and damage your speakers and the amplifier itself. It is highly
recommended to use an audio specialist to properly adjust.
High Power/High Current Mode Selector
This amplifier is designed to maximize power in 4-ohm or 2-ohm operation through
two repositionable fuses accessible through a removeable window on the bottom
of the amplifier.
High Power:
In this default setting, the amplifier will maximize its output when powering 4-ohm
speakers in stereo. This requires the fuses to be placed into the outer two
receptacles.
High Current:
In the High Current setting, the amplifier will maximize its output when powering a
2-ohm speaker load in stereo or a 4-ohm speaker load when bridged. This requires
the fuses to be moved to the inner two receptacles.
MPS 2.150 LIMITED - Features

LOW
Rem
Offset Signal MIN MAX
Input
Level
Turn on
Mode
MIN MAX
Input
Level
CH1 CH2
REM
Battery
Remote
Left
Right
HIGH
Rem
Offset Signal MIN MAX
Input
Level
Turn on
Mode
MIN MAX
Input
Level
CH1 CH2
Signal or
Offset
Optional MPS-HL
Line Level Adaptor
Speaker Level
Audio Signal
Battery
Left
Right
MPS 2.150 LIMITED
Power and Signal Connections
LOW LEVEL – RCA INPUTS
HIGH LEVEL – SPEAKER TO RCA INPUTS

MPS 2.150 LIMITED
Speaker Connections
2-CHANNEL STEREO-HIGH POWER (4Ω) MODE
2-CHANNEL STEREO-HIGH CURRENT (2Ω) MODE
H/P LED will illuminate
indicate high current mode
Rem
Offset Signal MIN MAX
Input
Level
Turn on
Mode
MIN MAX
Input
Level
CH1 CH2
High
Power
4 Ohm Minimum
Per Channel
Default setting. Fuses must be
positioned to outer fuse holders
to maximize output power when
connecting a 4-ohm speaker load.
Fuses must be positioned to
inner fuse holders to maximize
output power when connecting
a 2-ohm speaker load
H/C LED will illuminate
indicate high current mode
Rem
Offset Signal MIN MAX
Input
Level
Turn on
Mode
MIN MAX
Input
Level
CH1 CH2
High
Current
2 ohm Minimun
Per Channel

MPS 2.150 LIMITED
Speaker Connections
H/C LED will illuminate
indicate high current mode
Rem
Offset Signal MIN MAX
Input
Level
Turn on
Mode
MIN MAX
Input
Level
CH1 CH2
High
Current
4 ohm
Minimun
Fuses must be positioned to
inner fuse holders labeled “High
Current” to maximize output
power when connecting a 4-ohm
mono speaker load
4 ohm
Minimun
BRIDGED MODE (4Ω MONO LOAD ONLY)

Power Status Indicator
The ON LED will illuminate blue when amplifier is
properly powered on.
Protection Status Indicator
The PRT LED will illuminate red if the amplifier faults and goes into protect
mode. There are several reasons that could cause that amplifier fault including
over current, over or under voltage, short circuit, thermal protection, or an
internal error within the amplifier. If the fault is caused by thermal protection,
the amplifier will reset automatically once the heatsink has cooled to about
70°C (160°F). If the PRT LED stays illuminated, the power status LED will flash a
code indicating the potential issue. See Fault Code at rear of manual.
Negative Chassis Ground Connection
Connect an 8 gauge or larger OFC (oxygen-free copper) wire for ground (same
gauge used for +12V power wire). The length of the ground wire should not
exceed 36 inches (90cm) from the amplifier. To ensure a solid connection,
remove surface paint at the ground point prior to securing the connector in
place.
Remote Turn-On Connector
Connect to wire lead from a switched +12V source. This could be a remote turn
on lead from a head unit or switched ignition lead. If neither of these sources is
available, switch Turn On Mode to signal sensing or DC offset (see #10).
1
2
3
MPS 1.1100 LIMITED - Features
Rem
Subsonic
40 220 0db 12dB
Offset Signal MIN MAX
Input
Level Bass
Boost
Lowpass
Filter (Hz)
Turn on
Mode
25Hz
Off 35Hz
1
2
3 4 5 67 8 910
10 11 12 13 14
1
2
3 4 5 6 9
1
2
3 4 5 67 8 910
10 11 12 13 14
4

+12VDC Power Connection
For optimum performance, connect a 4 gauge OFC (oxygen-free copper) wire to the
+12V terminal. This wire should be connected directly to the positive terminal (+12V)
of the car’s battery in conjunction with a 100 amp inline fuse. For safety purposes, the
fuse must be located within 16 inches (40cm) of the battery.
Subwoofer Outputs
There are two speaker terminals labeled + and two terminals labeled -. This is a single
channel amplifier so both pairs of the terminals are internally parallel. See Speaker
Connections.
RCA Inputs
Accepts both low-level and high-level signal via RCA style connectors. Use Input
Voltage Selector to choose appropriate voltage level. High-level inputs require the
MPS-LC line level adaptor (sold separately) to convert amplified speaker outputs from
factory audio systems to RCA style connections.
RCA Outputs
These are non-buffered through-pass outputs used to connect additional amplifiers.
Not that the internal crossover does not affect signal to these outputs.
High/Low Level Input Voltage Selector
Select signal input voltage based on the type of input used. When using an aftermar-
ket radio, DSP or line level convertor, select Low for levels up to 4V. When using
high-level input from an amplified factory audio system, select High for levels up to
20V.
Remote Level Control
Connection for optional MPS-R1 remote subwoofer level control. This allows the user
to adjust the output level of the amplifier on the fly from a remote location within the
vehicle.
Turn On Mode Selector
Select between 3 modes to turn on the amplifier. When using a switched lead such as
the remove output of a radio, select the default position REM. When connecting to a
factory audio system or alternative source, select Signal and the amplifier will turn on
when it senses voltage through the inputs. DC (DC offset) may be used in some
vehicles where signal sensing does not reliably turn the amplifier on.
5
8
9
10
6
7
11
MPS 1.1100 LIMITED - Features

Input Sensitivity Controller
These are used to properly match input levels with the source signal to optimize the
amplifier outputs. THEY ARE NOT A VOLUME CONTROL! To set properly, the
maximum unclipped output from the radio or source must be known using proper
test equipment. The input level adjustments can then be properly set to maximize
output without overdriving the amplifier. If the gain is not set properly the amplifier
may clip and damage your speakers and the amplifier itself. It is highly recommend-
ed to use an audio specialist to properly adjust.
Subsonic Filter Selector
Designed to be used with small subwoofers or vented enclosures with a high tuning
frequency, users can opt to select a 12dB subsonic filter (highpass crossover)
centered at either 25Hz or 35Hz.
Lowpass Frequency Controller
This amplifier is designed as strictly a subwoofer amplifier and therefore the crosso-
ver cannot be defeated. The crossover frequency controller allows the user to adjust
the frequency of the Lowpass crossover filter between 40 and 220Hz.
Bass Boost Controller
This allows the user to boost the output of the amplifier centered around 45Hz with a
range of 0 to +12dB.
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13
14
15
MPS 1.1100 LIMITED - Features

HIGH LEVEL – SPEAKER TO RCA INPUTS
MPS 1.1100 LIMITED
Power and Signal Connections
LOW LEVEL – RCA INPUTS
HIGH
Rem
Offset Signal
Off 35Hz
MIN MAX
Input
Level Bass
Boost
Turn on
Mode
Lowpass
Filter (Hz)
Subsonic
40 220 0dB 12dB
Signal or
Offset
Battery
Left
Right
Optional MPS-R1
Remote Level
Control
25Hz
LOW
Rem
Offset Signal
25Hz
Off 35Hz
MIN MAX
Input
Level Bass
Boost
Turn on
Mode
Lowpass
Filter (Hz)
Subsonic
40 220 0dB 12dB
REM
Battery
Left
Remote
Right
LOW
Rem
Offset Signal
25Hz
Off 35Hz
MIN MAX
Input
Level Bass Boost
Turn on
Mode
Lowpass
Filter (Hz)
Subsonic
40 220 0dB 12dB
REM
Battery
Left
Remote
Right
Optional MPS-R1
Remote Level
Control

DUAL SUBWOOFER CONNECTION
MPS 1.1100 LIMITED
Speaker Connections
SINGLE SUBWOOFER CONNECTION
Rem
Offset Signal
Off 35Hz
MIN MAX
Input
Level Boost
Mode
pass
Filter (Hz)
Subsonic
40 220 0dB 12dB
25Hz
4-Ohm
Minimum
4-Ohm
Minimum
Rem
Offset Signal
Off 35Hz
MIN MAX
Input
Level Bass
Boost
Turn on
Mode
Lowpass
Filter (Hz)
Subsonic
40 220 0dB 12dB
25Hz
2-Ohm
Minimum