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Parasound ZM250 Universal 2 Channel 4 Speaker & Sub Amplifier

Parasound ZoneMaster Universal 2 Channel 4 Speaker & Sub Amplifier


The Parasound ZM250 is a new class leading 2 channel 4 speaker & sub amplifier.

Depsite it's demure footprint, the ZM250 will deliver 50 watts of sonically superior audio quality per channel into 8 Ω and up to 90 watts per channel into a 4 (and yes it's high current design even enables powering loads down to 2 ohm as well). This power and flexibility is of course bridled with deceptively good fidelity, as can be seen in the ZM250's Class AB input stage plus premium Class D power stage - which is of course the key point of any Parasound product. As with any Parasound product, internal components are 'selected' and chosen for these key principles, they are just not assembled to meet the lowest common denominator of production criteria. Often 'Class D' amplifiers can be overly clinical and to an an extent unmusical - but the ZM250 excels with deep enveloping performance and very adept dynamics more akin to a class AB amplifier, and yet has the benefits (especially within custom installation) of low heat and low power consumption.

The ZM250 also has a very adaptable dedicated sub-woofer output, so that it can be the perfect amp for high quality installs where 2.1 set up's are required. Building upon connectivity for sub-woofers,the ZM250 also has an in built 80Hz low pass filter in bridged mode which means it is ideal for driving in-wall/in-ceiling woofers/passive sub(s). So in effect the ZM250 is a little bit like a 'swiss arny knife' for higher end custom intallation projects, so you can keep everything under one banner effectively - which means that the ZM250 can be called upon at all times to be flexible and yet bullet proof in a host of scenarios.

Another highly adaptable feature is the provision of a mono mode, that combines L and R for single speaker applications. This easily overlooked feature means that it can be used highly effectively in corridors, semi commercial installations where stereo imaging is not beneficial and finally a potential 'get out of jail card' for 'compromised' installations too. The ZM250 also features as a consequnce a full range mono RCA output too, so amps can be stacked together and looped together very simply, and with the best level of interconnectivity.

This continuance of 'real world'  custom installation credentials can be further seen with automatic on/off by 12 V trigger (with loop) and also automatic on/off by audio signal with adjustable sensitivity. Level controls for each channel are rear mounted and the unit has gold-plated RCA input jacks and looping line output jacks. The ZM250 also benefits from a dedicated speaker level input too, which in certain applications can be deftly used, especially with other distributed audio systems where integration with other components is more commonly done with high level signals opposed to pre-amplified ones.

The ZM250 has two dedicated speaker outputs also (A & B), and can accept larger gauge speaker cables to (up to 12 guage) - which inevitably comes in useful for projects with longer runs, or alternately higher quality speaker cables that may require a little bit more real estate. Now it can also be rack mounted too - with the additon of Parasound's rack accessories for the ZoneMaster product line (ZRK Rack Mount Kit for Half Width ZoneMaster & Z Products).

So if you are looking for a ultra-flexible but seriously great sounding single zone power amplifier (let alone an amp with such a small physical footprint), and one that can be used for a multitude of high performance custom installation situations, then you cannot look any further than the new Parasound ZM250 - it is a must for any serious custom installation professional and project.

Parasound ZoneMaster ZM250 - Universal Two Channel Amplifier - Features & Benefits:

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
Compact 1U, 1/2 width chassis size
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)
0.5 watt standby power consumption meets Energy Star & EU specs
Rack mount kit sold separately

Parasound ZoneMaster ZM250 - Universal Two Channel Amplifier - Specifications:

Power Output – RMS, All Channels Driven (20 Hz - 20 kHz)
 50 watts x 2 @ 8 Ω
 90 watts x 2 @ 4 Ω or 2 Ω
 160 watts x 1 @ 8 Ω (Bridged Mode)
 200 watts x 1 @ 4 Ω (Bridged Mode)
Low Pass Crossover
 80 Hz, 18 dB per octave
Minimum Speaker Impedance
 Stereo Mode: 2 Ω
 Bridge Mode: 4 Ω
 *Note: Operation at these minimum impedances might require additional ventilation.
Frequency Response
 10 Hz - 60 kHz, +0/-3 dB
Total Harmonic Distortion
 < 0.05 % at typical listening levels
 < 0.9 % 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, 5 mA
Audio Trigger Requirements
 2 mV audio signal (5-8 minutes turn off delay)
AC Power Requirement:
 250 Watts maximum
 15 Watts typical (music playing)
 7.5 Watts idle (no music playing)
 0.5 Watts in standby
 Width: 8.5” (220 mm)
 Depth: 10” (254 mm)
 Depth: 12” (305 mm) with AC cord and cables connected
 Height, with feet: 2” (51 mm)
 Height, without feet: 1.75” (45 mm), 1U
 Net: 4.0 lbs. (1.8kg)
 Shipping: 7.0 lbs. (3.1 kg)

Parasound ZoneMaster ZM250 - Universal Two Channel Amplifier - Resources & Downloads:

Parasound ZoneMaster ZM250 - Universal 2 Channel 4 Speaker & Sub Amplifier Manual

Parasound ZoneMaster Range Brochure