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Parasound ZoneMaster 4 4-Channel Amplifier ZM4

Precio habitual $1,249.00 USD
Precio habitual Precio de venta $1,249.00 USD
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A customizable two-zone amp

The versatile Parasound ZoneMaster 4 provides 120 watts to each of its four channels. You get independent setup for two zones, with connections for up to eight speakers total. This amp offers multiple input and automatic power-up options for maximum flexibility in a custom installation.

Adjustable level controls

Each channel has a level control that's accessible using a screwdriver, via the back panel. That means you can establish maximum volumes for each zone, at safe levels. If you install local in-wall volume controls in each room, then anyone using the system can turn it up as much as they want without risk of damaging the audio equipment (or their ears).

Inputs and outputs

This amp features a master bus with a stereo RCA input and loop output, plus a speaker-level input for integrating with audio systems that don't have a line-level output. Each zone has its own individual stereo RCA input, and a line/bus selector switch for additional system design flexibility.

Each zone also offers A and B pairs of four-pin Euroblock speaker outputs with a stereo/mono switch. In stereo mode, up to two pairs of connected speakers can be used to reproduce left and right channels. In mono mode, you can have a total of four speakers in that zone, all reproducing the same summed mono L+R signal.

Power-up options

The ZoneMaster 4 lives up to its name in another way by offering detailed control of turn-on options for each zone. A three-position switch lets you choose to manually turn on both zones, turn on both zones at once via a master 12-volt trigger, or individually select a zone to turn on automatically in response to its own 12-volt trigger.

Product highlights:

  • 120 watts per channel into 8 ohms (20-20,000 Hz) at 0.05% THD with 4 channels driven
  • 150 watts per channel into 4 or 2 ohms
  • 2-ohm stable design enables it to drive multiple speakers
  • frequency response: 20-20,000 Hz (+0/-0.25dB)
  • signal-to-noise ratio: 112 dB
  • rack mounting ears included
  • detachable power cord



  • Bus input:
    • four-pin Euroblock speaker-level input for integrating with audio systems that don't have a line-level output
    • stereo RCA input and loop output
  • Zone 1/Zone 2 each include:
    • one unbalanced stereo RCA input pair
    • individual level control knobs for each channel
    • four-pin Euroblock connectors for A/B speaker output
    • input selector: line in/Bus
    • stereo/mono switch
  • turn on options: manual, 12-volt all on, or 12-volt by zone
  • 3.5mm 12-volt trigger input/loop output for "all on"
  • two zone-specific 3.5mm 12-volt trigger input/output pairs with on/off toggles


Dimensions and warranty:

  • 17-1/4"W x 2-1/2"H x 16"D (1U rack space)
  • weight: 12 lbs.
  • warranty: 3 years
  • Our 60-day money-back guarantee
  • MFR # ZM 4

What's in the box: 

  • Parasound ZoneMaster 4 owner's manual
  • Stereo power amplifier
  • 6' AC power cord
  • Two 6' Mono-minijack cables
  • 1U Rack-mount kit
  • Owner's Guide

Features & specs

Number of Channels 4
Power Output per Channel (8 ohms) 120
Power Output per Channel (6 ohms) ---
Power Output per Channel (4 ohms) 150
Frequency Bandwidth 20-20k
THD 0.05%
Minimum Impedance 2
Bridged Power per Channel 0 watts
Speaker Outputs 8
THX Certification No
Width (inches) 17-1/4
Height (inches) 2-1/2
Depth (inches) 16
Weight 12 pounds
Parts Warranty 3 Years
Labor Warranty 3 Years
Inputs & Outputs  
Number of Inputs 4
Input Type RCA, Speaker-Level
Removable Power Cord IEC 3-prong
Level Controls Yes
Speaker Connectors Phoenix

Product Research


4-Channel Zone Amplifier: The Parasound ZoneMaster 4 amplifier features a total of four channel inputs that are grouped into two zones with each zone having speaker A & B outputs for a total connection of eight speakers. The ability of the ZoneMaster 4 to drive two pair of speakers for each zone is credited to Parasound's 2 ohm stable high-current design.

  • 8 Ohms: 120 watts x 4 channels @ 20-20kHz with 0.05% THD (all channels driven)
  • 4 or 2 Ohms: 150 watts x 4 channels @ 20-20kHz with 0.05% THD (all channels driven)

Operating Modes: The rear-panel Mode switch determines if a Zone will output audio in stereo or mono. The Mode switch has the same effect whether you have selected the Line inputs or one of the Bus inputs.

  • Stereo: The Stereo setting routes the Left channel input to the Left channel speaker outputs and the right channel input to the Right channel speaker outputs.
  • Mono: The Mono setting combines the Left and Right channel inputs into a summed L+R mono signal and routes it to both the Left and Right channel speaker outputs. In the Mono mode you can connect two mono speakers to the A output, one speaker connects to the L+ and L- and the other speaker connects to the R+ and R- terminals. An additional two mono speakers can be connected to the B output terminals. All speakers will play the same Mono signal. The Mono Mode is particularly useful for applications such as bathrooms and hallways where mono speakers and a single speaker wire are more practical than separate L and R wires and two speakers.

Bus Inputs: The Parasound Zone Master 12 amplifier is equipped with one stereo line-level Bus input and one stereo speaker-level Bus input. These Bus inputs can be selected as a source for a single zone or both zones.

  • Bus 1 Line-Level Input: This is a stereo RCA line-level audio input that any zone of the ZoneMaster 4 can select as its source. To select Bus as the input for one or more zones set each zone's input switch to its Bus position.
  • Bus Speaker-Level Input: This is an additional type of audio input that any zone can select as its source. The speaker-level Bus input enables the ZoneMaster 4 to connect to any audio receiver or stereo system even if it lacks preamp output jacks. This is a high impedance input and the ZoneMaster 4's speaker level input can connect to the speaker terminals on any receiver or amplifier. This will not reduce its output power or degrade the sound quality of the speakers that are already connected directly to the "host" receiver or amplifier. Audio connected to the Bus speaker-level input connector can be routed to any zone by setting each zone's input switch to the Bus input. Speaker level audio is also converted to line-level and routed to the Bus loop out jacks which provide a line level output to drive additional amplifiers.

Note: You should connect only the Bus line-level input or the speaker-level input connector, but not both.

4Ch Line-Level Inputs: The ZoneMaster 4 features standard line-level audio RCA inputs for each of its 4 channels. Connect these jacks to the Left and Right output jacks on your preamplifier, whole-house audio controller, or the zone outputs of your AV receiver. Ensure that the Input switch is set to Line In for each zone that is connected this way. Each of the four channels has its own level control. Fully counter-clockwise is all the way off and no sound will be heard from that channel, while fully clockwise is maximum volume.

  • By adjusting the channel level controls you can limit the maximum volume in a zone regardless of how high someone turns up the volume on the preamp or whole-house controller.
  • If you hear hiss or other background noise you can reduce its audibility by turning down the Level controls until you no longer hear the noise.
  • Adjust only the left or right channel Level knob until you hear your music equally from your preferred listening location.

Bus Loop Outputs: These stereo RCA loop outputs enable the audio source connected to the line-level or speaker-level Bus inputs to pass along or daisy-chain to an additional amplifier. The volume level and signal voltage at the Bus loop outputs the same as the volume level and signal voltage of the sources that are connected to their corresponding Bus input. Audio from the speaker-level Input connector is converted to line-level and simultaneously routed to the Bus loop output to drive additional amplifiers.

A & B Speaker Outputs: The ZoneMaster 4 is equipped with connections for two speakers on each channel (labeled "A" and "B"). This unique feature gives installers greater flexibility and can usually avoid the added expense, complexity, heat and power consumption of additional amplifiers. The minimum speaker load impedance is 2 ohms per channel.

  • Detach the green speaker output connecting blocks by pulling them away from the ZoneMaster 4's rear-panel. This makes attaching speaker wires more convenient.
  • The speaker connector blocks accept bare wires as large as 12AWG. The ends of the wires should be twisted tightly and/or lightly tinned with solder to prevent stray wire strands from short circuiting the amplifier.
  • The speaker connector blocks do not support banana plugs or other connectors of any kind.

Turn-On Options: The Turn On Options Switch determines whether both Zones turn on and off together or if each Zone turns on and off individually. There are three positions for this switch - Manual All, 12V All, or Audio/12V By Zone.

  • Manual All: In this mode, pressing the Power button on the front-panel will turn both Zones on and off together.
  • 12V All: When a 12V trigger voltage is applied to the 12V Input jack marked "Trigger For All Zones" both Zones will turn on together. When the trigger voltage is removed both Zones will turn off together.
  • Audio/12V By Zone: Each zone can be turned on and off individually by either an audio signal or a 12 volt trigger. The setting of the 12V/Audio switches determines whether an individual zone is turned on and off by 12 volts or turned on and off by audio.

12V Loop Outputs: The two Trigger Out jacks lets you loop or daisy-chain the incoming trigger voltage from one Zone to another Zone or from one Zone to an additional amplifier.

Rack-Mount Kit: Brackets and hardware for mounting the Parasound ZoneMaster 4 amplifier in a 1U rack-space of a standard 19" equipment rack are included.