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Item #: ZM4
MSRP: No Retail


Building on the solid foundations laid by its predecessor the ZM450, the new Parasound ZoneMaster ZM4 punches in with increased size, power and connectivity.


  • 120 watts x4 @ 8 Ω
  • 150 watts x4 @ 4 Ω or 2 Ω
  • 8 speaker connections (A and B outputs for both channels)
  • High current for stable operation at 2 Ohms
  • Class AB input stage plus premium Class D power stage
  • Bus input with looping outputs
  • Audio sensing auto-on trigger, independent for each zone
  • 12 volt auto-on trigger inputs, one for each zone
  • Master 12V trigger input to turn all zones on-off together
  • Looping 12 volt trigger outputs
  • Speaker level input for expanding systems w/out pre out jacks
  • Mono mode combines L and R for single speaker applications
  • Separate level controls for all 4 channels
  • Detachable speaker connectors accept up to 12 gauge wire
  • Short circuit and overheat protection with front panel indicators
  • 0.5 watt standby power consumption meets Energy Star & EU specs
  • Compact 1u chassis size
  • Rack mount kit included in the box



Power Output – RMS, Both Channels Driven (20 Hz - 20 kHz) 
120 watts x 4 @ 8Ω 
150 watts x 4 @ 4Ω or 2Ω


Minimum Speaker Impedance: 
A+B Outputs of a Single Channel: 2 Ω 

Note: Continuous operation at this minimum impedance might require additional ventilation for the amplifier.


Frequency Response: 
20 Hz - 20 kHz, +0/-0.25 dB 
5 Hz - 50 kHz, +0/-3 dB


Total Harmonic Distortion: 
< 0.05 % at typical listening levels 
< 1.0% at full power


Interchannel Crosstalk: 70 dB at 20 kHz


Total Gain: 29 dB (Level controls set to Maximum)


S/N Ratio: >112 dB, input shorted, IHF A-weighted


DC Trigger Requirements: +9 Vdc to +12 Vdc, 5 mA


Audio Trigger Requirements: 2 mV audio signal


AC Power Requirement: 
600 Watts maximum 
60 Watts typical (music playing in all zones) 
30 Watts idle (all zones on) 
15 Watts idle (one zone on) 
100-250 VAC 50/60 Hz (automatic)


Width: 17.25" (437 mm) 
Depth: 14.25" (362 mm) 
Depth: 16" (406 mm) with cables connected 
Height, with feet: 2.5" (63.5 mm) 
Height, without feet: 1.75" (45 mm), 1U


Net: 12 lbs. (5.5kg) 
Shipping: 18 lbs. (8.2 kg)


Prop 65WARNING: This product contains chemicals including Styrene which is known to the state of California to cause cancer, and Bisphenol A (BPA), which is known to the state of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

In certain instances promotional prices will be offered listed above as a “Price with Rebate”, and are typically dated. In these cases Instant Rebate (IR) pricing is good sometimes only for the day only or only for the week. In order to be eligible for IR pricing – the order must be paid for AND picked up/shipped out. If you are placing an online order outside of business hours within your respective time zone, please add a note to your order for the team to confirm the pricing, or contact the branch the following business day to ensure that the item pricing carries over into the subsequent period. If an alternate branch location is still open in another time zone, please reach out to that group.

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