1. Introduktion
The ALTO TX412 is a 700-watt, 12-inch powered loudspeaker designed for various audio applications, including live sound, rehearsals, and events. It features a 2-channel mixer, Bluetooth connectivity, and True Wireless Stereo (TWS) linking for flexible setup and operation. This manual provides essential information for safe and effective use of your TX412 speaker.

Billede 1.1: Forside view of the ALTO TX412 Powered PA Speaker.
2. Vigtige sikkerhedsoplysninger
Before operating the TX412 speaker, please read and understand all safety instructions. Keep this manual for future reference.
- Strømkilde: Connect the speaker only to a power supply of the type described in this manual or marked on the unit. Ensure the voltage matches your region (100/120V; 50/60 Hz).
- Jording: This product must be grounded. Do not defeat the safety purpose of the polarized or grounding-type plug.
- Vand og fugt: Brug ikke dette apparat i nærheden af vand eller i damp environments. The TX412 is not waterproof.
- Varme: Må ikke installeres i nærheden af varmekilder såsom radiatorer, varmeapparater, komfurer eller andre apparater (inklusive ampløftere), der producerer varme.
- Ventilation: Bloker ikke ventilationsåbninger. Sørg for korrekt luftgennemstrømning omkring enheden.
- Rensning: Rengør kun med en tør klud.
- Service: Overlad al service til kvalificeret servicepersonale. Service er påkrævet, når apparatet er blevet beskadiget på nogen måde, såsom strømforsyningsledning eller stik er beskadiget, væske er blevet spildt, eller genstande er faldet ind i apparatet, apparatet har været udsat for regn eller fugt, ikke fungerer normalt , eller er blevet droppet.
- Høreværn: Prolonged exposure to high volume levels can cause permanent hearing damage. Use caution when setting volume levels.
3. Pakkens indhold
Bekræft, at alle nedenstående varer er inkluderet i din pakke:
- TX4 Series Loudspeaker (TX412)
- Strømkabel
- Brugervejledning
- Sikkerheds- og garantimanual
Hvis der mangler eller er beskadigede varer, bedes du straks kontakte din forhandler.
4. Nøglefunktioner
The ALTO TX412 speaker offers a range of features for enhanced audio performance and versatility:
- 700W Bi-Amplified Power: Delivers clear and powerful sound with 500W for low frequencies (LF) and 200W for high frequencies (HF).
- 12-inch LF Driver: Features a 2-inch voice coil for robust bass response.
- 1-inch Titanium Diaphragm HF Compression Driver: Provides crisp and detailed high-frequency reproduction.
- Integreret 2-kanals mixer: Allows direct connection of microphones, line-level devices, and Bluetooth audio sources.
- Bluetooth-forbindelse: Seamlessly stream audio from compatible devices.
- True Wireless Stereo (TWS) Linking: Wirelessly connect two TX412 units for stereo sound without additional cables.
- Contour EQ: Optimized equalization for music playback applications.
- Mix output: XLR output for linking multiple speakers.
- Integrated 36mm Pole Socket: For standard speaker pole mounting.
- Robust kabinet: Durable construction with a full metal grille and ergonomic handles for portability.

Image 4.1: Key power and driver specifications of the TX412.

Billede 4.2: Overview of amplifier, mixer, and TWS features.
5. Opsætning
Follow these steps to set up your ALTO TX412 speaker:
5.1. Placering
- Polmontering: The TX412 includes a 36mm pole socket for mounting on a standard speaker pole. Ensure the pole and stand are stable and rated to support the speaker's weight (approximately 29.3 lbs / 13.3 kg).
- Gulvmonitor: The speaker can also be used as a floor wedge monitor. Position it on a stable surface with the appropriate angle for monitoring.

Image 5.1: Illustration of the pole socket and other features.
5.2. Strømtilslutning
- Sørg for, at højttalerens tænd/sluk-knap er i OFF-positionen.
- Connect the included power cable to the AC input on the rear panel of the speaker.
- Sæt den anden ende af strømkablet i en jordet stikkontakt.
5.3. Lydforbindelser
The TX412 features a 2-channel mixer on its rear panel. Refer to Image 5.2 for control layout.

Image 5.2: Rear panel connections and controls.
- Kanal 1 (CH1): This input accepts XLR or 1/4" (6.35 mm) connections. Use the LINE/MIC switch to select the appropriate input level. For microphones, set to MIC. For line-level devices (mixers, instruments), set to LINE.
- Kanal 2 (CH2): This input accepts XLR or 1/4" (6.35 mm) connections. It is primarily for line-level devices or a second microphone.
- Bluetooth-indgang: The Bluetooth input is integrated into Channel 2.
- Mix output: Use the XLR Mix Out to send the combined audio signal from the TX412 to another speaker or audio device.
5.4. Bluetooth-parring
- Power on the TX412 speaker.
- On the rear panel, press and hold the Bluetooth PAR button until the Bluetooth LED flashes.
- Enable Bluetooth on your audio device (e.g., smartphone, tablet).
- Select "ALTO TX412" from the list of available devices. The Bluetooth LED on the speaker will illuminate solid when paired.
5.5. True Wireless Stereo (TWS) Linking
To link two TX412 speakers wirelessly for stereo sound:
- Ensure both TX412 speakers are powered on and not currently paired with any Bluetooth device.
- On one speaker (this will be your primary speaker), press and hold the TWS LINK button. The TWS LED will flash.
- On the second speaker (secondary speaker), press and hold the TWS LINK button. The TWS LED on both speakers will illuminate solid when linked.
- Now, pair your Bluetooth audio device to the primary speaker as described in Section 5.4. Audio will play in stereo across both linked speakers.

Image 5.3: Visual representation of TWS linking and Contour EQ.
6. Operating the TX412
Once set up, you can control the TX412 using the rear panel controls.

Billede 6.1: Detaljeret view of the TX412 rear panel controls.
- Gain-knapper (CH1, CH2): Adjust the input level for each channel. Start with these knobs at their minimum position and slowly increase until the desired volume is achieved without distortion. The SIGNAL/LIMIT LED indicates signal presence (green) and clipping (red). Reduce gain if the LED turns red.
- Contour EQ: This switch applies a pre-set EQ curve optimized for music playback, enhancing bass and treble. Engage it for music, disengage for speech or when using an external mixer.
- Jordløft: Use this switch to help eliminate hum or buzz caused by ground loops. If you hear unwanted noise, try flipping this switch.
- Lydstyrkekontrol: The main volume knob controls the overall output level of the speaker.
7. Vedligeholdelse
Proper maintenance ensures the longevity and optimal performance of your TX412 speaker.
- Rensning: Disconnect the power cable before cleaning. Use a soft, dry cloth to wipe the exterior surfaces. Do not use solvents, abrasive cleaners, or waxes.
- Opbevaring: Når højttaleren ikke er i brug i længere perioder, skal den opbevares køligt og tørt, væk fra direkte sollys og ekstreme temperaturer.
- Inspektion: Periodically check the power cable and audio cables for any signs of damage. Replace damaged cables immediately.
8. Fejlfinding
If you encounter issues with your TX412 speaker, refer to the following common problems and solutions:
| Problem | Mulig årsag | Løsning |
|---|---|---|
| Ingen strøm | Power cable not connected; outlet not active; power switch off | Ensure power cable is securely connected; test outlet with another device; turn power switch ON. |
| Ingen lyd | Input gain too low; incorrect input selected; faulty cable; source device muted/low volume | Increase channel gain and main volume; check LINE/MIC switch; test with a different cable; ensure source device is playing audio. |
| Forvrænget lyd | Input gain too high; source device output too high | Reduce channel gain until SIGNAL/LIMIT LED no longer turns red; lower volume on source device. |
| Bluetooth ikke parring | Speaker not in pairing mode; device too far; already paired to another device | Press and hold Bluetooth PAIR button; move device closer to speaker; disconnect from other devices. |
| Brummen eller summen | Ground loop; faulty cable | Engage the Ground Lift switch; try different cables. |
9. Tekniske specifikationer
| Feature | Specifikation |
|---|---|
| Modelnavn | TX412 |
| Højttaler type | Powered PA højttaler |
| Højttaler størrelse | 12 tommer |
| Højttaler Maksimal udgangseffekt | 700 watt (peak) |
| LF driver | 12-inch woofer, 2-inch voice coil |
| HF driver | 1-inch titanium diaphragm compression driver |
| Frekvensrespons | 20 KHz (Upper limit, full range not specified) |
| Horn Dækning | 90° x 60° Wide-Dispersion |
| Amplivligere Type | Ultra-efficient Class-D (500W LF + 200W HF) |
| Input bindtage | 100/120V; 50/60 Hz |
| Forbindelsesteknologi | Bluetooth, XLR Mix Out, XLR or 1/4” (6.35 mm) Inputs |
| Bluetooth version | 5.0 |
| Monteringstype | Floor Standing, Pole Mount (36mm socket) |
| Produktmål (D x B x H) | 13.5 cm x 14.92 cm x 24.9 cm |
| Varens vægt | 29.3 pund (13.3 kilo) |
| Materiale | Metal, Plast |
| Farve | Sort |
| UPC | 816311012300 |
10. Garanti og support
The ALTO TX412 speaker comes with a limited warranty. Please refer to the included Sikkerheds- og garantimanual for detailed terms and conditions, including warranty duration and coverage.
For technical support, service inquiries, or additional product information, please visit the official ALTO Professional website or contact their customer support directly. Contact information can typically be found on the ALTO Professional website or in the warranty manual.





