Alesis Alpha 112 PA Loudspeaker User Manual

Content

Alesis Alpha 112 PA Loudspeaker Manual and User Guide

Introduction

The alesis Alpha 112 PA Loudspeaker is an active 12-inch powered loudspeaker designed for live performances, presentations, rehearsal spaces, mobile DJs, houses of worship, and general music playback. Its integrated amplifier and mixer section allow the speaker to operate without a separate power amplifier, simplifying setup for performers and sound technicians.

The system combines a 12-inch neodymium low-frequency driver with a titanium diaphragm compression driver for balanced full-range sound. Built-in digital signal processing helps manage crossover performance and speaker protection, while the Contour control provides a convenient tonal adjustment for music playback. Two microphone/line inputs with independent level controls support common vocal, instrument, mixer, and playback configurations.

Its lightweight cabinet can be used upright on a speaker stand or pole, or positioned as a floor monitor. An XLR link output makes it possible to connect an additional loudspeaker in larger sound systems. Built-in handles support transport, while the pole socket and M10 rigging points provide installation flexibility when used with compatible hardware.

This powered PA speaker suits musicians, presenters, DJs, educators, event organizers, and small production crews who need straightforward connectivity and high output from a portable enclosure. Always use suitable stands, cables, and mounting hardware, and follow safe operating practices when deploying the alesis Alpha 112 PA Loudspeaker.

Alesis Alpha 112 PA Loudspeaker Specifications

System type: Active, full-range 2-way PA loudspeaker with integrated mixer and DSP.
Continuous output power: 500 W RMS, consisting of 350 W for low frequencies and 150 W for high frequencies.
Peak output power: 1,000 W peak.
Maximum sound pressure level: 123 dB continuous and 126 dB peak at 1 meter.
Frequency range: 51 Hz–20 kHz at -10 dB.
Frequency response: 52 Hz–20 kHz at +3 dB.
Low-frequency driver: 12-inch neodymium woofer with a 2.5-inch voice coil.
High-frequency driver: Titanium diaphragm compression driver with a 1-inch exit and 1.75-inch voice coil.
Coverage: 80/100 degrees horizontal by 60 degrees vertical nominal coverage.
Crossover: DSP-based 1.6 kHz Linkwitz-Riley crossover.
Inputs: Two microphone/line inputs using XLR or 1/4-inch TRS connectors, with independent volume controls.
Output: One XLR link output for connecting another loudspeaker.
Mounting: Integrated 36 mm pole socket and five M10 rigging points.
Dimensions: 25.5 by 15.1 by 14.4 inches, or 648 by 384 by 365 mm.
Weight: Approximately 31 pounds for the loudspeaker cabinet.

How to Set Up the Alesis Alpha 112 PA Loudspeaker

Place the cabinet on a stable, level surface, compatible speaker pole, or properly rated stand. Keep the front grille clear and do not block ventilation openings.
With the power switch turned off, set both channel volume controls to their lowest positions.
Connect a microphone, mixer output, instrument preamp, or playback device to Input 1 or Input 2 using a balanced XLR or 1/4-inch TRS cable. Use the line setting when connecting a mixer or other line-level source, if provided by the control panel.
For a second loudspeaker, connect the first cabinet’s XLR link output to the input of the next speaker using a balanced XLR cable.
Connect the supplied power cable to the loudspeaker and an appropriate grounded AC outlet. Confirm that the local mains voltage matches the speaker’s required supply.
Turn on connected source equipment first, then switch on the Alpha 112. Raise the source output and channel volume gradually.
Use the Contour setting when a gently enhanced music-playback response is desired. Leave it disengaged when a more neutral presentation is preferable.
Keep the clip or limit indicator from remaining illuminated. Persistent clipping indicates excessive input level or insufficient gain staging.

Never connect the speaker to an ungrounded or damaged outlet. Do not suspend the cabinet from M10 points unless the hardware, load rating, and installation method are approved for loudspeaker rigging. Disconnect AC power before moving, cleaning, or servicing the unit.

Alesis Alpha 112 PA Loudspeaker Troubleshooting

No sound: Confirm the power indicator is illuminated, verify the power cable and outlet, check the source device, and slowly raise the appropriate channel volume.
Sound from only one source: Check the cable at both ends and confirm the source is connected to the intended input. Test with a known-good balanced cable.
Distorted or harsh audio: Reduce the source output and channel gain. A continuously lit clip or limit indicator usually means the input signal is too strong.
Low output: Check whether the source has a low output level, whether the channel control is reduced, and whether an unsuitable adapter or unbalanced cable is being used.
Hum or buzz: Use balanced connections where possible, connect equipment to the same AC circuit, and test the ground-lift control only as directed by safe audio-system practice.
Intermittent operation: Inspect connectors for looseness, keep liquid away from the cabinet, and allow the speaker to cool if it has been operating at high level in a hot environment.
Protection activation: Power the speaker off, reduce operating levels, check ventilation, and allow the system to return to normal temperature before restarting.

No model-specific numeric error-code list is identified in the available Alpha 112 documentation. Do not attempt internal repairs or bypass protection circuits. Record the model, serial number, purchase information, symptoms, connected equipment, and troubleshooting steps before contacting Alesis support. Warranty service may require proof of purchase and an authorized return process; customers in the United States and Canada should contact Alesis support, while customers elsewhere can contact the place of purchase or regional Alesis support channel.

Pros and Cons of the Alesis Alpha 112 PA Loudspeaker

Advantages

Integrated amplification: The powered design eliminates the need for a separate external amplifier, reducing system complexity.
Flexible connections: Two XLR/TRS combination inputs support microphones, mixers, instruments, and playback sources.
Expandable system: The XLR link output makes daisy-chaining an additional speaker practical for wider coverage.
Useful cabinet design: The speaker supports upright operation, pole mounting, and floor-monitor placement.
High output capability: The 500 W RMS system and stated maximum SPL provide substantial headroom for many small and medium applications.
Installation options: A pole socket and M10 rigging points offer more deployment choices than basic portable PA cabinets.

Limitations

No substitute for a subwoofer: A 12-inch full-range cabinet can provide useful low end, but deep bass at high volume may require a dedicated subwoofer.
Limited onboard mixing: The integrated mixer is convenient for simple setups but does not replace a multi-channel mixing console for complex productions.
Rigging requires expertise: M10 mounting points should be used only with approved hardware and qualified installation procedures.
Best suited to portable PA use: Users needing advanced wireless control, extensive DSP presets, or elaborate routing may need a more feature-rich loudspeaker system.

The alesis Alpha 112 PA Loudspeaker is a strong fit for users who value straightforward operation, flexible input options, portable deployment, and substantial full-range output. Consider a different system when deep sub-bass, advanced network control, or large-scale touring features are essential.

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Faqs

How do I set up the alesis Alpha 112 PA Loudspeaker for the first time?

Place the alesis Alpha 112 PA Loudspeaker on a stable surface, speaker stand, or suitable pole mount with clear space around the cabinet. Set both volume controls fully down before connecting equipment. Run a balanced XLR or 1/4-inch TRS cable from a mixer, microphone, instrument preamp, or other line-level source to an input, connect the power cable, and switch on the source before the speaker. Raise the input volume gradually while watching for clipping.

Can I connect two alesis Alpha 112 PA Loudspeakers together for a larger sound system?

Yes. Use the Alpha 112 link output to send the input signal to a second powered loudspeaker with an XLR cable. Connect the main source to the first speaker, then connect its link output to the second speaker’s input. Begin with both volume controls low and adjust them evenly. For stereo operation, use separate left and right outputs from a mixer rather than linking the same signal.

Why is my alesis Alpha 112 PA Loudspeaker producing no sound?

Check that the power cable is firmly connected and the power switch is on. Confirm that the source device, mixer channel, and master output are not muted, then inspect the XLR or 1/4-inch cable for damage. Make sure the correct input is connected and its volume control is raised. Test the speaker with another known-working cable and source. If the power indicator remains off, disconnect the unit and have it inspected by qualified service personnel.

How can I stop clipping and distortion on the alesis Alpha 112 PA Loudspeaker?

Reduce the mixer’s channel gain or the source output level first, then lower the Alpha 112 input volume if the clip or limit indicator remains active. Avoid turning every control fully up, because excessive gain at any stage can overload the signal path. Keep microphones away from the speaker’s front to prevent feedback, and use balanced cables where possible. Increase overall volume gradually while preserving headroom for musical peaks.

What is the Contour switch used for on the alesis Alpha 112 PA Loudspeaker?

The Contour switch applies a gentle equalization curve intended to enhance music playback. It can make recorded music sound more polished when the Alpha 112 is used without an external mixer or detailed system EQ. For speech, vocals, presentations, or situations where clarity and natural tone matter most, compare the sound with Contour disabled. Avoid combining heavy mixer EQ with Contour until you have checked for excessive bass, harshness, or feedback.

Can I use the alesis Alpha 112 PA Loudspeaker as a stage monitor?

Yes. The Alpha 112 cabinet can be positioned as a floor wedge monitor, allowing performers to hear vocals or instruments from the stage. Aim the front of the speaker toward the performer’s listening position while keeping microphones outside the speaker’s direct sound path. Start with modest monitor levels and raise them only as needed. A mixer’s monitor or auxiliary output is preferable because it allows independent control from the main audience mix.

What equipment and cables are compatible with the alesis Alpha 112 PA Loudspeaker?

The Alpha 112 accepts microphone or line-level sources through its XLR or 1/4-inch TRS combo inputs. It can connect to mixers, microphones with suitable signal levels, audio interfaces, keyboards, playback devices with an appropriate output, and other professional audio equipment. Use balanced XLR or TRS cables for longer runs and improved noise rejection. The XLR link output is designed to pass the signal to another powered loudspeaker.

How should I clean and maintain my alesis Alpha 112 PA Loudspeaker?

Switch off and unplug the Alpha 112 before cleaning. Wipe the cabinet with a soft, dry or slightly damp cloth, and keep liquids away from the controls, connectors, grille, and power inlet. Do not spray cleaner directly onto the speaker or use solvents. Inspect cables, connectors, mounting hardware, and the grille periodically for damage. Transport the cabinet carefully, protect it from moisture and extreme temperatures, and never block ventilation openings.