Alesis Alpha-115 2-way Loudspeaker User Manual

Content

alesis Alpha-115 2-way Loudspeaker Manual

Introduction

The alesis Alpha-115 2-way Loudspeaker is an active full-range PA speaker designed for live sound, music playback, presentations, rehearsals, and mobile performance systems. Its powered design combines amplification, signal processing, input mixing, and speaker protection in one cabinet, reducing the amount of external equipment required for a working sound system.

At the heart of the cabinet is a 15-inch neodymium low-frequency driver for strong bass response and a 1.75-inch titanium high-frequency driver for detailed vocal and instrument reproduction. The built-in mixer provides two microphone/line inputs with independent level controls, while the XLR link output makes it possible to connect another loudspeaker or compatible powered cabinet.

The Alpha-115 can operate as a traditional upright PA speaker or as a floor monitor. Its integrated pole socket supports stand or pole mounting, and multiple M10 threaded points support suitable professional rigging applications. A contour function provides an adjusted tonal response for music playback, while onboard DSP helps maintain consistent performance during live use.

This powered 15-inch loudspeaker suits DJs, bands, solo performers, houses of worship, educators, event technicians, and venues that need flexible sound reinforcement. It is especially useful when quick setup, high output, straightforward controls, and expansion to a second speaker are more important than advanced wireless networking or app-based control.

alesis Alpha-115 2-way Loudspeaker Specifications

Speaker type: Active two-way full-range loudspeaker with floor-monitor capability.
Low-frequency driver: 15-inch neodymium driver.
High-frequency driver: 1.75-inch titanium driver.
Continuous power: 500 W RMS, consisting of 350 W for low frequencies and 150 W for high frequencies.
Peak power: 1,000 W, consisting of 700 W for low frequencies and 300 W for high frequencies.
Active crossover: DSP-based Linkwitz-Riley design at 1.6 kHz.
Inputs: Two microphone/line combo inputs accepting XLR or 1/4-inch TRS connections, with independent volume controls.
Link output: One XLR output for sending the mixed signal to another loudspeaker.
Controls: Input level controls, master volume, contour function, power switch, LED indicators, and ground-lift control.
Mounting: Integrated 36 mm pole socket, two handles, and five M10 threaded rigging points.
Cabinet: Trapezoidal injection-molded polypropylene enclosure with perforated steel grille.
Dimensions: Approximately 26.7 inches high by 16.9 inches wide by 15.2 inches deep.
Power: Supports 100 V, 110–120 V, and 220–240 V AC at 50/60 Hz, depending on the applicable regional configuration.

How to Set Up the Alesis Alpha-115 Loudspeaker

Place the speaker on a stable, level surface. For audience coverage, install it on a suitable speaker stand or pole using the integrated socket. For monitoring, position the cabinet securely on its angled side.
Turn the power switch off and rotate the volume controls fully down before making connections.
Connect a microphone, mixer output, instrument processor, or playback device to either combo input using an appropriate XLR or 1/4-inch TRS cable. Use line-level equipment with the line input configuration where applicable.
For a second powered cabinet, connect the Alpha-115 XLR link output to the input of the additional speaker.
Connect the supplied power cable to the loudspeaker and a suitable grounded AC outlet. Keep the power switch off while connecting or disconnecting the cable.
Turn on connected source equipment first, then switch on the Alpha-115. Slowly raise the input and master levels until the required volume is reached.
Use the contour function for music playback when a shaped tonal balance is preferred. Leave it disengaged when a flatter response is more suitable for speech or sound-system mixing.

Keep the cabinet dry, provide ventilation, and never obstruct the grille or rear controls. Do not suspend the speaker from its M10 points unless the installation is designed and inspected by qualified personnel using approved hardware.

Troubleshooting the alesis Alpha-115 2-way Loudspeaker

No sound

Confirm that the power indicator is illuminated, the master and channel controls are raised, and the source device is producing signal. Check both ends of every cable and test a known-good XLR or TRS cable. If another speaker is connected through the link output, verify that the receiving speaker is powered and its input level is raised.

Sound is distorted or unexpectedly quiet

Reduce the source output and input level if the clip or limit indicator remains active. Excessive gain at the mixer, playback device, or loudspeaker input can cause audible distortion. If the system is quiet, check whether the source is connected to the correct input and confirm that no mute, pad, or inactive channel setting is affecting the signal.

Hum or unwanted noise

Use balanced XLR or TRS connections where possible and connect audio equipment to a common electrical circuit. Disconnect audio cables one at a time to identify the source. The ground-lift control may help with a persistent ground loop, but it should not be used to defeat protective earth connections.

Intermittent shutdown

Allow ventilation around the cabinet, check the AC connection, and lower the operating level. Avoid extension cables or power sources that cannot provide stable power. Do not continue operating the unit if it smells overheated, shows physical damage, or repeatedly shuts down.

The Alpha-115 does not require user-entered error codes for normal operation. For unresolved faults, record the model, serial number, symptoms, and troubleshooting steps already attempted. Contact Alesis support through the official support channel. In the United States and Canada, warranty service begins with the Alesis support team; in the United Kingdom, Europe, and other regions, contact the place of purchase or the regional Alesis support channel. Keep proof of purchase available because warranty processing may require it.

Pros and Cons of the Alesis Alpha-115

Advantages

Integrated amplification: The powered design eliminates the need for a separate power amplifier in many portable PA systems.
Flexible input section: Two combo inputs support microphones, mixers, instruments with suitable preamps, and playback equipment.
Easy system expansion: The XLR link output simplifies connection to a second powered loudspeaker.
Full-range 15-inch format: The large low-frequency driver is useful for vocals, recorded music, instruments, and general-purpose event sound.
Multiple installation options: The cabinet can be used upright, as a floor wedge, on a pole, or in qualified rigging applications.
DSP and protection: Digital processing, crossover management, and protective limiting help maintain predictable performance during demanding use.

Limitations

No stated wireless control: Users seeking Bluetooth streaming, remote app control, or networked configuration may need a different loudspeaker system.
Single-cabinet bass limits: A full-range 15-inch cabinet may not replace a dedicated subwoofer for high-impact dance music or large venues.
Rigging requires expertise: The M10 points are not a substitute for a professionally engineered suspension system.
Portable size: The 15-inch enclosure provides useful low-end output but is larger and heavier to transport than many 10-inch or 12-inch PA speakers.

The alesis Alpha-115 2-way Loudspeaker is best suited to performers, DJs, presenters, and event operators who want high-output wired sound reinforcement with simple onboard mixing. A smaller speaker may be more appropriate for compact rooms, while a system with a dedicated subwoofer or advanced digital networking may better suit larger productions.

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Faqs

How do I set up the Alesis Alpha-115 2-way Loudspeaker for the first time?

Place the Alesis Alpha-115 2-way Loudspeaker securely on a stand, pole, or stable floor position. Turn the volume controls fully down, connect your mixer, microphone, or audio source to an XLR or 1/4-inch input, and attach the power cable while the speaker is switched off. Power on the source equipment first, then the loudspeaker. Gradually raise the input and master volume, watching the clip or limit indicator to prevent distortion.

How can I connect two Alesis Alpha-115 2-way Loudspeakers together?

Connect your mixer or audio source to the first Alesis Alpha-115 2-way Loudspeaker using an XLR or 1/4-inch cable. Run a balanced XLR cable from its Mix Out or link output to an input on the second speaker. Set each speaker’s volume independently, beginning with low levels. Use balanced cables where possible to reduce hum, and power down the system before changing connections.

Can the Alesis Alpha-115 2-way Loudspeaker be used with a microphone without a mixer?

Yes, the Alesis Alpha-115 2-way Loudspeaker can accept a microphone directly through one of its combination XLR and 1/4-inch inputs. Connect a suitable microphone cable, select the appropriate input type if controls require it, and raise the channel volume slowly. Keep the microphone behind the speaker and avoid pointing it toward the front grille to reduce feedback. For multiple microphones, instruments, or playback devices, use a mixer.

Why is the Alesis Alpha-115 2-way Loudspeaker producing distorted or muffled sound?

Distortion usually results from excessive input gain, an overloaded mixer output, or a constantly illuminated clip indicator. Lower the source level first, then reduce the speaker’s channel or master volume if necessary. Check that cables are fully inserted and undamaged. If the sound is muffled, inspect equalizer settings, disable unsuitable processing, and confirm that the grille is unobstructed. Avoid placing the cabinet directly against a wall or corner when excessive bass is present.

What does the Contour switch do on the Alesis Alpha-115 2-way Loudspeaker?

The Contour switch changes the tonal balance of the Alesis Alpha-115 2-way Loudspeaker by emphasizing low and high frequencies for music playback. This setting can make recorded music sound more lively, but it may increase the chance of feedback during live vocals. For speech, monitoring, or maximum headroom, use the flatter setting when appropriate. Adjust the switch while listening at moderate volume rather than changing it during a loud performance.

Can I use the Alesis Alpha-115 2-way Loudspeaker as a stage monitor?

Yes, the Alesis Alpha-115 2-way Loudspeaker can be positioned as a floor wedge monitor. Place it in front of the performer and aim it toward the listening position, keeping microphones outside its main sound path. Start with conservative monitor volume and increase it only as needed. If feedback occurs, lower the problematic channel or frequency on the mixer, reposition the microphone, and avoid using unnecessary bass or treble boost.

How can I get cleaner and louder performance from the Alesis Alpha-115 2-way Loudspeaker?

Use balanced XLR or TRS cables, keep mixer output levels moderate, and set the speaker volume high enough without triggering continuous clipping. Position the cabinet above head level for audience coverage when used upright, or angle it carefully as a monitor. Keep the front grille clear and avoid extreme equalizer boosts. For larger systems, distribute sound across linked speakers instead of forcing one Alesis Alpha-115 2-way Loudspeaker to operate constantly at its limit.

What maintenance and storage practices does the Alesis Alpha-115 2-way Loudspeaker need?

Unplug the Alesis Alpha-115 2-way Loudspeaker before cleaning, and wipe the cabinet with a soft, dry or slightly damp cloth. Keep liquids, dust, heat, and moisture away from the connectors, controls, and ventilation areas. Inspect power and audio cables regularly for cuts or loose plugs. Transport the cabinet carefully, store it covered in a dry location, and avoid stacking heavy equipment on the grille or control panel.