ZoneMaster Model 250

  • Our ZoneMaster models are very similar in their feature sets, differing mainly in size and number of channels.
    Looking for more channels? Try the 1250, 650, or 450.
  • Universal amplifier for applications from 50 to 200 watts
  • 4 speaker connections (A and B outputs for both channels)
  • High current for stable operation at 2 Ohms
  • Channel pairs are bridgeable for up to 200 watts @ 4 Ohms
  • Class AB input stage plus premium Class D power stage
  • One Independent audio sensing trigger
  • One Independent 12 volt trigger input
  • Looping 12 volt trigger output for one zone
  • Speaker level input for expanding systems w/out pre out jacks
  • One bus input can be routed to any zone
  • Looping output to connect additional amplifiers
  • Mono mode combines L and R for single speaker applications
  • Separate level controls for both 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

ZoneMaster 250 Specific Features

  • Compact 1u, 1/2 width chassis size
  • Rack mount kit sold separately (click to view)
  • Full Range Mono RCA Output
  • 80Hz low pass Mono RCA output (for sub)
  • Built in 80Hz low pass filter in bridged mode for driving in-wall/in-ceiling woofers or passive sub(s)

Power Output
RMS, All Channels Driven (20 Hz - 20 kHz)

50 watts x 2 @ 8Ω
90 watts x 2 @ 4Ω or 2Ω
160 watts x 1 @ 8Ω (Bridged)
200 watts x 1 @ 4Ω (Bridged)

Frequency Response
10 Hz - 60 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

Input Sensitivity:
700mv = Full output (50 Watts @ 8 Ω)
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, 2 mA

Audio Trigger Requirements
2 mV Audio Signal

AC Power Requirement:
250 Watts Maximum
15 Watts Typical
7.5 Watts Idle
0.5 Watts Standby
110-130 VAC 60 Hz or 220-255 VAC 50 Hz
Note: AC mains voltage is set only by qualified electronics technician.

Width: 8.5" (220 mm)
Depth: 10" (254 mm)
Height, with feet: 2" (51 mm)
Height, without feet: 1.75" (45 mm), 1U

Net: 4.0 lbs (1.8kg)
Shipping: 7 lbs (3.1kg)

All four of the high-performance amplifiers in Parasound’s ZoneMaster™ line combine legendary Parasound Class AB sound quality with the most reliable Class D power modules in the industry, setting a new standard in residential and commercial amplification. Here are more reviews on ZoneMaster amplifiers:

ZM 1250 - Sound+Image (Australia - July, 2015)
"Let's be bold here and propose something - you can never have too many amplifiers! Even if your principal system is an astonishingly high quality audiophile set-up, what about the rest of the house? Or what about the 11 channels required for a full (or 7.1.4 at least) Dolby Atmos system? ... With stereo music the amp surprised us: the music was delivered with a combined honey-like smoothness and precision of truly high-quality amplifiers... the dynamic lift with the entry of the band into the song was completely unlimited... We ran several of our favourite Atmos-ey scenes from 'The Hunger Games - Catching Fire Part 1', with impressive dynamic impact and precision in the hemispherical imaging provided by this disc…It's hard to think how a power amplifier could be any more versatile than the Parasound ZoneMaster Model 1250. But that's not the end of it, because this isn't merely a workhorse; it's also an audiophile-quality product in its own right."

ZM 650 - CE Pro: Hands On—Parasound ZoneMaster 650 Brings Audiophile Sound to Whole-House Market
"The ZoneMaster Model 650, amplifier provides dealers with a sturdy, hybrid six-channel or three channel stereo amplifier solution that can drive just about any loudspeaker thrown at it... down to 2 ohms. What really struck me was the level of control it had on the bottom end. I found the amp completely natural sounding—very analog like with a nice neutral tonality and big soundstage. The ZoneMaster 650 is one of the few whole-house audio amps that brings audiophile performance to the whole-house audio category."

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