CasaTunes CT-5X4 Matrix Amplifier

Important Safety Instructions

  1. Read these instructions.
  2. Keep these instructions.
  3. Follow all instructions.
  4. Do not use this apparatus near water.
  5. Clean only with dry cloth.
  6. Do not block any ventilation openings.
  7. Install in accordance with the manufacturer’s instructions.
  8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus(including other amplifiers) that produce heat.
  9. Use the apparatus only in Moderate climates (not in tropical climates).
  10. Do not defeat the safety purpose of the polarized or grounding type plug. A polarized plug has two blades with one wider than the other, a grounding type plug has two blades and a third grounding prong, the wide blade or the third grounding prong are provided for your safety. If the provided plug does not fit onto your outlet, consult an electrician for replacement of the obsolete outlet.
  11. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
  12. Only use attachments and accessories specified by the manufacturer.
  13. Unplug this apparatus during lightning storms or when unused for long periods of time.
  1. Ensure there is adequate ventilation. Leave 20cm (8”) of free space at the top and sides. Good airflow is necessary to help ensure proper operation. Not only should you provide enough free space around the unit, but also ensure that air can flow freely and escape from the amplifier surroundings. Failure to do so may cause thermal shutdown of the unit, and reduced life expectancy.


Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as:

  • When the power supply cord or plug is damaged
  • If liquid has been spilled, or objects have fallen into the apparatus.
  • If the apparatus has been exposed to rain or water.
  • If the apparatus has been dropped or damaged in any way.
  • If the apparatus does not operate normally by following the instructions. Adjust only those controls that are covered by the operating instructions.
  • When the apparatus exhibits distinct change in performance this indicates a need fora service.

WARNING! Do not expose the apparatus to dripping or splashing.Do not place objects filled with liquids near the apparatus.

WARNING! To reduce the risk of fire orelectric shock, Do not expose this apparatus to rain or moisture.

WARNING! Equipment must be connected to a Mains socket outlet with a protective earthing connection.

WARNING! Never push objects of any kind into the apparatus through openings as they may touch dangerous voltage points or short-out parts that could result in a fire or electric shock.

IMPORTANT! Ensure adequate ventilation.



Occasionally you should dust the unit all over with a soft cloth. For stubborn stains, use a soft cloth dampened with a weak solution of mild detergent and water. Dry the unit immediately afterwards with a clean cloth. Don’t use abrasive cloths, thinners, alcohol, or other chemical solvents, because they may damage the finish or remove the panel lettering.



AC outlet voltages vary from country to country. Make sure that the voltage in your area meets the voltage requirements printed on the unit’s power adapter. e.g. ~ 110V / 240V, 50/60HZ.

If you do not intend to use the unit for an extended period, remove the power cord from the AC outlet.

Never Touch This Unit with Wet Hands

Never handle this unit or its power cord while your hands are wet or damp. If water or any other liquid gets inside this unit, have it checked by your CasaTunes dealer

Handling Notes

The AC fuse inside the unit is not user-serviceable. If you cannot turn on the unit, contact the dealer from whom you purchased this unit.

  1. If you need to transport this unit, use the original packaging
  2. Do not leave rubber or plastic items on this unit for a long time; they may leave marks on the case.
  3. This unit’s top and rear panels may get warm after prolonged use. This is normal.

Speaker Shorts

Under no circumstances should the speaker output terminals of the unit be short circuited, grounded or connected to another output.


The features below are only available when using the CT-15X4MA with a CasaTunes music server to control one or more CT-12X8MA and CT-5X4MA matrix amplifiers.


The amplifier has four separate 30W @ 8 Ohms amplified zones.


You can add additional CT-5X4MA and CT-12X8MA matrix amplifiers to expand the number of zones beyond 4.

Alternatively, the CT-5X4MA can also be used to add four zones to an existing CT-12X8MA matrix amplifier.

To share sources between amplifiers CasaTunes uses distributed sources, which allows any source connected to any matrix amplifier to be shared with all amplifiers using audio-over-IP.


The amplifier has five separate sources.

1 x local RCA source input

1 x Balanced RCA input (using the included BALTX2 adapter)

1 x Balanced Optical source input (using the included BALTX2 adapter)

The BALTX2 adapter allows the 2 connected sources to be located up to 300ft away from the amplifier.

2 x Configurable COAX digital input/output

You can adjust the gain on each source, up to +18dB in 2dB steps, allowing you to adjust and balance the volume level between all the sources

For each zone you can configure up to a 600ms delay for each source.

4-band Equalizer

Each zone sports a 4-band equalizer.

CasaTunes provides various Equalizer Presets you can select from. These presets are selectable in the Now Playing screen in the CasaTunesX App, and include music presets for Acoustic, Classical, Dance, Electronic, Hip-Hop, Jazz, etc.

IP Control

The amplifier is controlled, monitored and programmed via Ethernet. In most instances, the CasaTunes music server will be used to control the amplifier.

CasaTunes automatically detects all your matrix amplifiers.

Firmware Upgradeable

You can use the CasaTunesX App to check for, and update, the firmware on your matrix amplifiers.

Thermal Control

The amplifier automatically monitors the temperature and takes progressive action depending on the temperature.

When the temperature reaches:

  • 194°F (90°C) the amplifier volume is reduced 20dB
  • 212°F (100°C) the amplifiers are shut down until the temperature drops below 194°F (90°C)


Each amplifier supports up to 2 keypads. The keypads can be assigned to control any of the zones in the system.

IR Forwarding

Each keypad includes an IR receiver. For each installed keypad, you can configure whether the IR signal received on a keypad should be forwarded to the IR OUT emitter based on the currently source selected (1-5) for the zone (assigned to the keypad)

Power Failure Restoration

After an AC power outage the amplifier restores its settings to the pre-interrupted state. All internal settings are stored in non-volatile memory.

Backup and Restore. Reset to Factory Defaults

You can backup the amplifier's current configuration settings, and restore them at a later date, if needed.

In addition, you can reset the amplifier to the factory defaults, if needed.

CasaTunes CT-5X4 Matrix Amplifier Front Panel

1 - S2/S3 (Input Sources 2 & 3)

Input sources 2 & 3 provide an analog RCA and digital optical input, respectively, using the included BALTX2 adapter. The BALTX2 adapter provides a balanced connection allowing sources to be located up to 300ft away.

2 - S1 (Input Sources 1)

Input source 1 requires an analog RCA connection.

3 - Infrared Receiver Output

Used to output routed IR from keypads Port 1 & Port 2.

4 - S4 IN/OUT (Input Source 4 or configurable output)

You can configure whether this is an input or output.

When configured as a digital coax input source, this is input source 4.

When configured as a digital coax output, you can assign it to Source 1 or Source 2, or to Zone 1, 2, 3 or 4.

5 - S5 IN/OUT (Input Source 5 or configurable output)

You can configure whether this is an input or output.

When configured as a digital coax input source, this is input source 5.

When configured as a digital coax output, you can assign it to Source 1 or Source 2, or to Zone 1, 2, 3 or 4.

6 - Keypad Ports

You can connect 1 or 2 keypads to control the CT-5X4MA. You can assign the zone to be controlled by each port. In addition, you can configure the IR Receiver on the keypads to be routed to the IR OUT emitter (based on the currently selected source for the zone)

7 - Ethernet network connection

Network connection

8 - Power supply connection

Connection to 15V external power supply (included)

9 - Speaker terminals

Plug in terminal clamp connectors accepts 16 gauge (1.5mm²) speaker wires

Example System Configuration

Example of a typical whole house music installation using a CasaTunes CT-5X4MA
Figure 1 - Typical System Configuration

Figure 1 illustrates a possible CasaTunes multi room system configuration where the amplifier is powering audio into three listening zones (Kitchen, Master Bedroom, and Office), and the fourth zone, the Living Room, is being powered by an AV Receiver fed by the pre-amplified output from S5 OUT (which is configured to output Zone 4).

The TV Audio output is being fed into the CT-5X4MA matrix amplifier as S3 (input source 3) using the BALTX2 adapter. The BALTX2 balanced audio adapter allows the source component, TV, to be located up to 300 ft away from the CT-5X4MA matrix amplifier.

Each zone can choose to listen to either of the 2 x CasaTunes music server streams or the TV Audio. In this example, there is one unused input source (S4) which can be connected to other music sources, such as additional CasaTunes music streams (using a  CT-Plus-3), Amazon Echo Link, SONOS Port, etc.

Also shown In this example, is how the system is being controlled. You can use an Alexa enabled device and use your voice, you can use Android or iOS phones and/or tablets, and you can also use the optional CasaTunes CT-KP2 keypads.

Multiple Amplifiers

In larger installations multiple amplifiers can be used together to increase the number of zones. You can add multiple CT-5X4MA amplifiers, or a combination of CT-12X8MA and CT-5X4MA matrix amplifiers, providing greater installation flexibility. For example, you might start with a single CT-5X4MA amplifier, and then decide later to add more rooms by adding another CT-5X4MA.

When using a CasaTunes music server with more than one CT-12X8MA and/or CT-5X4MA amplifiers, CasaTunes uses audio-over-IP and the built-in distributed sources capabilities of the amplifier to virtually connect sources between amplifiers.

To simplify setup in a multiple amplifier setup, CasaTunes implements a Master/Slave model.  The master amplifier is the primary amplifier that CasaTunes communicates with (and always includes Zone 1).  Slave amplifiers are any additional CT-12X8MA and CT-5X4MA amplifiers on the network.

If one of the matrix amplifiers you are installing is a CT-12X8MA, we recommend you configure this amplifier as your master amplifier. All sources on the master amplifier, that are not hidden, are automatically configured as distributed sources, and are available to all the other matrix amplifiers.

CasaTunes automatically configures any CT-12X8MA and CT-5X4MA matrix amplifiers when discovered on the network. Therefore, it is very important to add the master amplifier to the network first, before any additional amplifiers, otherwise the amplifier selected as the master will be unpredictable.

A major benefit of using audio-over-ip to share sources between amplifiers, is the amplifiers no longer need to be physically located next to each other, as long as they have access to the same network.

Configuring the CT-5X4MA using the CasaTunesX App

If you are using a CasaTunes music server, you must configure the CT-5X4MA using the CasaTunesX App.

You can install the CasaTunesX App on your preferred device, including Amazon, Android, and Apple iOS devices, or you can use any HTML5 browser.

Learn more about CasaTunesX

Navigating to System Setup using the CasaTunesX App

To configure your CT-5X4MA (and/or CT-12X8MA) matrix amplifiers, select the menu option in the CasaTunesX App header and navigate to Settings > System Setup as shown in the figure below.

Use the CasaTunesX App to configure the Settings
Figure 2 - Configuring your System using the CasaTunesX App

Configuring your Matrix Settings

Navigate to Settings > System Setup > Matrix Amplifier and select CasaTunes CT-5X4/CT-12X8 as the Matrix Model. The selected option is used to setup both the CT-12X8MA and CT-5X4MA matrix amplifiers. To simplify setup, CasaTunes will automatically discover the IP address of your master matrix amplifier.

The CasaTunesX settings page for the CasaTunes CT-12X8MA and CT-5X4MA matrix amplifiers
Figure 3 - Configuring the CasaTunes CT-12X8MA and CT-5X4MA matrix amplifiers

The Amplifier Interconnect Settings should be configured to use Audio-Over-IP to connect the sources between the amplifiers, when using more than one amplifier.

Configuring the CT-5X4MA Sources

Here's a thought!
By default the CasaTunesX App will prompt the user to confirm saving changes to a source, room or room group. This can be cumbersome when configuring your setup for the first time. You can disable the confirmation prompt by changing this setting in SettingsAppGeneral Settings. After you have completed the initial setup you may want to re-enable confirmation prompts to avoid accidentally changing these items.

Navigate to Settings > System Setup > Sources to configure the sources for your matrices. The App displays all the available sources that are available on the first, or master amplifier (see previous discussion about Multiple Amplifiers).

The column on the left is used to display the source number, and whether the source is to be hidden from the UI. Blue items are visible in the UI, gray items are hidden. To hide a source, disable the Display Source checkbox in the Source Settings detail view.

Location field identifies which amplifier and which source index the CasaTunes source is associated with
Figure 4 - Configuring Sources on the CT-12X8MA and CT-5X4MA

The most commonly used Source Types are:

Navigate into a source to configure the source settings. You can configure the Source Name, select the Source Type, whether to Display a Source, and depending on the Source Type selected, there may be additional settings to configure.

  • None - Select this option if you are not using this source. Selecting this option, automatically hides the source from the UI (by automatically unchecking the Display Source setting). We recommend hiding all sources you are not using
  • CasaTunes Media Player – Select this option for all media player connections from your CasaTunes music server
  • Unsupported – Select this option when you want to add a source that is not natively supported by CasaTunes. When you select this Source Type for a room, you will be able to power the room on/off, control and mute the volume, but to control the source you will need to use the control App for the source component
  • SONOS – Select this option to connect a SONOS Port or Connect and allow CasaTunes to access and control the SONOS network. Refer to the SONOS integration page for more information.

The Location setting identifies which source this is. Since you can connect a source to any amplifier, the location setting identifies which amplifier, and which source on the amplifier, this source is connected to. In the example shown in Figure 4, the David Player source is located on the Amplifier whose ID is 187 and is connected to Source 1.

Adding sources from other amplifiers

Both the CasaTunes CT-12X8MA and the CT-5X4MA matrix amplifiers support up to 32 distributed sources. Any input source, on any amplifier, can be configured as a distributed source. Distributed sources are shared (virtually connected) with all the other amplifiers via the network using a low latency audio-over-ip protocol.

To add a source that is connected to a slave amplifier:

  • Select Edit in the Configure Sources page
  • Select Add Source
  • Casatunes displays all the available sources from all the other (slave) amplifiers, including the source number and amplifier ID
  • Select the source to add to the available sources
  • Configure the settings for the added source (similar to all other sources)
Location field identifies which amplifier and which source index the CasaTunes source is associated with
Figure 5 - Adding a slave source on the CT-12X8MA and CT-5X4MA

Configuring the CT-5X4MA Rooms

Navigate to Settings > System Setup > Rooms to configure the rooms for your matrices. The App displays all the available rooms. This includes all the rooms available on all your matrices in your network. In addition, if you enabled SONOS support and/or transmission to AirPlay speakers, then all your SONOS and AirPlay speakers will be listed as well.

Similar to sources, the column on the left is used to display the room number, plus whether the room is to be hidden from the UI. Blue items are visible in the UI, gray items are hidden. To hide a room, disable the Display Room checkbox in the Room Settings Detail view.

To configure a specific room, navigate into the room.

Low Pass Filter and frequency selection option available for Zones 7 & 8
Figure 6 - Configuring Rooms

For each matrix amplifier room, you can configure the following settings:

  • Room name
  • Assign a picture to the room
  • Select whether to display or hide the room
  • Select whether to exclude this room from the "All On" command
  • Set a maximum, turn on, and/or fixed volume for the room
  • Configure balance, bass, treble and loudness for a room
  • Configure whether to output audio in stereo or mono
  • Select an Equalizer Preset for the room (which utilizes the built in 7-band equalizer)
  • Select which sources can be assigned to the room
  • Select whether to "publish" this room as an AirPlay speaker
  • Specify whether this room is included in a global page, playing a chime or mute operation
  • Configure the page, chime or text-to-speech volume for this room
  • Specify whether the output of this zone is connected to an AV Receiver
Low Pass Filter and frequency selection option available for Zones 7 & 8
Figure 7 - Configuring Detailed Room Settings

Connecting AV Receivers using the CT-5X4MA

S4 IN/OUT & S5 IN/OUT connectors can be configured either as input or outputs. To connect these to a secondary power amplifier (such as the CasaTunes CT-250A and CT-2100A stereo amplifiers) or an AV Receiver, configure one or both of these connections as a zone output.

When connecting either of these connections to a coax input on the AV Receiver, you can configure the receiver model/type to be controlled, whether to use IP or serial control, the parameters for the communication protocol, and to select which AVR input is connected to the output of this zone.

CasaTunes supports many popular AV Receivers, including single or multi-zone receivers, as long as they support IP or serial control. From a user perspective, listening to music in a room that is powered by an AV Receiver is the same as any other room. For more information on seamless AV Receiver integration please refer to the following Tech Note.

Low Pass Filter and frequency selection option available for Zones 7 & 8
Figure 8 - Configuring the CT-5X4MA to connect to an AV Receiver
Here's a thought!
By default S4 IN/OUT and S5 IN/OUT as configured as input sources, Source 4 & Source 5 respectively.

To change the default assignment you will need to navigate to the configuration page of the built-in, native amplifier web interface (see Configuring the CT-5X4MA and CT-12X8MA using the built-in web interface), navigate to the Device Tab and configure the "Digital Audio I/O" section.

Using the CasaTunes CT-KP2 Keypads

Each CasaTunes CT-15X4MA supports up to 2 optional CT-KP2 keypads. Out-of-the-box, each keypad port is assigned to each zone on the matrix amplifier. ie. Keypad port 1 is assigned to the first zone.

You can assign a keypad port to any matrix zone, and you can also configure multiple keypad ports to control the same zone, however, you will need to use the built-in CT-5X4MA web application to re-configure the default settings.

The keypads can be used to control a room, as well as control the CasaTunes media player source, if assigned to the room.

When controlling a CasaTunes media player source, the following functionality is available:

Low Pass Filter and frequency selection option available for Zones 7 & 8
Figure 9 - Functionality provided by the CasaTunes CT-KP2 Keypads
Here's a thought!
Each CT-5X4MA amplifier supports up to 2 keypads. You connect the keypads to Keypad Ports 1 & 2. By default, the keypad connected to Keypad Port 1 will control the first zone on this amplifier (Zone 1 if this is the Master or only amplifier), and the keypad connected to Keypad Port 2 will control the second zone on this amplifier.

It is possible to assign any zone to any Keypad Port and even assign the same zone to multiple Keypad Ports. To change the default assignment you will need to navigate to the configuration page of the built-in, native amplifier web interface (see Configuring the CT-5X4MA and CT-12X8MA using the built-in web interface). You will find the Keypad Port setup at the bottom of this screen.