Clever Acoustics MA 4120 MKII – 480W 4-Zone Commercial Mixer Amplifier (4 x 120W)
Buy the Clever Acoustics MA 4120 MKII, a professional 480W 4-zone commercial mixer amplifier featuring four independent 120W RMS power modules, 100V / 70V / 25V line and 4–8 Ohm low-impedance compatibility, phantom power, and telephone/paging VOX priority. In stock, fast UK delivery.
The Clever Acoustics MA 4120 MKII is a high-performance, 4-zone commercial mixer amplifier engineered for multi-room venue sound, retail stores, educational facilities, corporate offices, and hospitality environments. Powered by four independent 120W RMS (4 x 240W peak) power amplifier engines housed in a single 3U 19-inch rackmount chassis, the MA 4120 MKII allows operators to control volume, source selection, and audio routing across four distinct building zones. Featuring four XLR/TRS combo channels with switchable Line/Mic/+48V Phantom Power, a dedicated RCA stereo input, and a telephone/paging input with VOX priority muting, this heavy-duty system supports both high-impedance commercial speaker lines (100V, 70V, 25V) and standard low-impedance 4–8 Ohm speaker setups.
Staff Take: The Expert Verdict
The single strongest selling point of the Clever Acoustics MA 4120 MKII is its complete matrix flexibility combined with four discrete 120W power amplifiers inside a single 3U rack unit. The standout feature is the flexible output routing switches on every input channel, allowing installers to assign background music to Zone 1, sports audio to Zone 2, or broadcast paging calls across all four zones simultaneously. We highly recommend this multi-zone amplifier for venue installation contractors, bar managers, and commercial building integrators who need flexible 100V line power distribution, local zone monitoring, and telephone override capabilities without stacking multiple separate power amplifiers.
Why Choose the Clever Acoustics MA 4120 MKII Amplifier?
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4 x 120W RMS independent zone output: Houses four separate 120W power amplifier stages (480W RMS total / 960W peak) to drive four independent venue zones.
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100V line & low-impedance compatibility: Features dedicated screw terminal outputs for 100V, 70V, 25V commercial distributed systems and 4–8 Ohm low-impedance speaker setups.
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5 versatile input channels: Channels 1–4 feature XLR/Jack combo sockets with switchable Mic/Line/+48V Phantom Power; Channel 5 provides stereo RCA line inputs.
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Flexible channel-to-zone routing: Push-button matrix selectors on each channel allow input signals to be routed to any single zone, multiple zones, or all four zones at once.
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VOX priority & telephone paging input: Integrated telephone override input automatically mutes background music sources during emergency announcements or microphone calls.
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Built-in LED VU monitoring speaker: Features a 1W 8-Ohm internal monitor speaker and headphone output with level control to cue and check zone audio directly at the rack.
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Precision tone & gain controls: Includes gain controls, 2-band Bass/Treble equalizers (±10dB), and illuminated mute switches for fine audio calibration.
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Tour-grade 3U 19-inch rackmount chassis: Built with a heavy-duty steel housing, temperature-controlled cooling fans, and integrated rack mounting ears.
Who is the Clever Acoustics MA 4120 MKII best suited for?
The Clever Acoustics MA 4120 MKII is designed first and foremost for commercial AV installers, venue systems integrators, and sound engineers who manage multi-zone commercial audio systems. Its four independent power outputs make it an ideal choice for multi-room venues—such as sports bars, pubs with outdoor beer gardens, fitness centers with multiple studio rooms, and places of worship—where different audio sources and volume levels are required across separate spaces.
For secondary applications, this mixer amplifier serves as a reliable core engine for office facilities, warehouses, and retail stores requiring automated paging over background music. The telephone/paging priority contact mutes background channels automatically, ensuring staff announcements are heard clearly across the entire facility.
Clever Acoustics MA 4120 MKII vs Single-Zone Amplifiers — What's Changed?
The primary advantage of upgrading to the MA 4120 MKII over traditional single-zone or basic 100V slave amplifiers is the consolidation of matrix routing and four discrete power channels into one chassis. Standard 100V amplifiers force an entire venue to play the same audio source at global volume levels. The MA 4120 MKII houses four independent 120W power engines, allowing operators to run high-energy music in a bar, quiet background audio in a dining area, and live commentary in a beer garden simultaneously.
Secondary enhancements focus on installer convenience and signal safety. The MKII version incorporates individual channel gain switches, switchable 48V phantom power on all mic lines, direct Line Outputs for expanding extra zones with slave amps, temperature-controlled fan cooling, and an onboard monitor speaker to check audio signals before sending them to the venue floor.
How to Set Up the Clever Acoustics MA 4120 MKII
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Secure the 3U chassis into a standard 19-inch equipment rack using appropriate rack screws.
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Connect your 100V line speaker circuits or 4–8 Ohm low-impedance speaker pairs to the corresponding zone terminal blocks on the rear panel.
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Connect your microphones, wireless receivers, or media players to Channels 1–4 (XLR/TRS combo) or Channel 5 (RCA line in).
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Set input sensitivity switches to MIC, LINE, or PHANTOM (+48V) based on your connected source equipment.
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If integrating a paging system, connect your telephone system override leads to the TEL/Paging terminals.
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Connect the AC power cable to a 110–240V mains supply, power on the unit, and use the routing buttons on each channel to assign audio to your desired output zones.
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Use the front panel Gain, Bass, Treble, and Zone Master volume controls to adjust output levels, using the internal monitor speaker or headphones to verify signal quality.
Technical Specifications
| System Feature |
Specification Details |
| Product Category |
4-Zone Commercial Mixer Amplifier |
| Power Output Rating |
4 × 120 W RMS @ 100V / 4–8Ω (4 × 240 W Peak / 480 W Total RMS) |
| Speaker Output Taps |
100 V, 70 V, 25 V Line & 4–8 Ohms Low Impedance (Screw Terminals) |
| Input Channels |
4 × XLR/TRS Combo (Mic/Line/+48V) + 1 × Stereo RCA (Line) + 1 × TEL Paging |
| Phantom Power |
+48 V DC (Switchable on Channels 1–4) |
| Frequency Response |
60 Hz to 17,000 Hz (±3 dB) |
| Tone Control Range |
Bass: ±10 dB @ 100 Hz / Treble: ±10 dB @ 10 kHz |
| Signal-to-Noise Ratio |
Mic: > 65 dB / Line: > 75 dB / TEL: > 65 dB |
| Total Harmonic Distortion |
< 1% @ 1 kHz (1W Output) |
| Priority & Paging Matrix |
Automatic VOX Telephone Override & Channel Priority Muting |
| Local Zone Monitoring |
Integrated 1W 8Ω Test Speaker & 6.35mm Headphone Jack with LED VU Meter |
| Cooling Architecture |
Temperature-Controlled Variable-Speed Cooling Fan |
| Rack Mount Height |
3U Standard 19-Inch Rackmount Chassis |
| Power Supply |
AC 110–240 V, 50/60 Hz (Max power consumption 550 W) |
| Dimensions (W × D × H) |
484 mm × 395 mm × 135 mm (3U Height) |
| Net Hardware Weight |
22.0 kg |
Frequently Asked Questions
Can I run both 100V line speakers and low-impedance 8-Ohm speakers on the same amplifier?
Yes, but on separate output zones. Each of the four independent 120W amplifier channels features its own dedicated output terminals for 100V, 70V, 25V, or 4–8 Ohm connections. You can run 100V line ceiling speakers on Zone 1 and standard 8-Ohm cabinet speakers on Zone 2 simultaneously.
How does the VOX telephone priority override function?
When a signal is detected on the telephone paging input (or Channel 1 depending on priority configuration), the amplifier automatically duck or mutes background music sources on Channels 4 and 5, allowing emergency announcements or paging calls to broadcast clearly across selected zones.
Does the unit feature phantom power for condenser paging microphones?
Yes. Input channels 1 through 4 feature rear-panel DIP switches that enable +48V phantom power individually on each XLR combo jack, allowing direct connection of professional gooseneck or condenser mics.
Can I expand the system if I need more than four zones?
Yes. Each output zone includes a direct Line Out terminal block. This allows you to pass pre-amp line signals downstream to external slave power amplifiers (such as the Clever Acoustics SL series) to drive extra speakers in larger zones.
What is the purpose of the built-in monitor speaker on the front panel?
The internal 1W monitor speaker and headphone jack allow system operators or technicians to listen to any of the four output zones or input channels locally at the equipment rack without having to walk into the venue rooms.
What's In The Box?
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1 × Clever Acoustics MA 4120 MKII 480W 4-Zone Mixer Amplifier
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1 × AC Mains Power Cable
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1 × Terminal Block Connector Set
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1 × Operational User Instruction Manual
Why Buy From DJKIT?
When you source your commercial sound reinforcement equipment from djkit®, you are partnering with an established UK audio specialist supporting venue installers, contractors, and businesses since 1999. Our technical team regularly designs and tests 100V line commercial audio systems, offering practical advice on speaker load calculations, cable gauging, multi-zone routing, and emergency paging compliance.
Whether you need assistance calculating total wattage taps or selecting matching 100V ceiling speakers and wall mounts, our sales specialists are ready to help. Contact our team today on 01635 780002 or send an inquiry to our main support desk. We offer flexible 0% finance options, real-time stock allocation, and fast UK mainland delivery to get your commercial audio installation completed smoothly.
