Alto TX125 & TX18S Powered Subwoofer User Guide

1.0 Introduction

Thank you for purchasing the TX Sub. This guide is designed to help you get the most out of your TX Sub. We recommend reading this guide before using the speaker.

1.1 Box Contents

• TX Sub
• Power Cable (6 ft. / 183 cm)
• Quickstart Guide
• Safety & Warranty Manual

1.2 Support

For the latest information about the product, including system requirements, compatibility, and product registration, visit altoprofessional.com.

For additional product support, visit altoprofessional.com/support.

2.0 Important Safety Precautions

Alto Professional and inMusic are not responsible for the misuse of these products or information. Ensure compliance with inspection and maintenance procedures. If installing casters, you are responsible for their safe and proper installation.

Caution: To reduce the risk of electric shock, do not connect the subwoofer to a power outlet while the grille is removed.

2.1 Loudspeaker Mounting

• Always install subwoofers in accordance with applicable electrical and building codes.
• When using a pole in the pole cup on top of the subwoofer cabinet to mount a loudspeaker, ensure the pole is rated to support the loudspeaker's weight and observe all manufacturer safety precautions.
• Do not mount multiple loudspeakers on the same pole.
• Always verify that the subwoofer is on a flat, level, and stable surface that can support its weight and any mounted loudspeaker and mounting equipment.
• Inspect the subwoofer, pole, and associated hardware before each use. Do not use equipment that is worn, damaged, or missing parts.
• Be cautious in windy, outdoor conditions. Do not attach banners or similar items to any part of a loudspeaker system, as these can act as a sail and topple the system.
• If you are unsure about handling the subwoofer's weight, ask for assistance.
• Ensure cables are routed safely away from performers, crew, and audience to prevent tripping hazards.

2.2 (Optional) Attaching Casters (only on TX18S)

The TX18S includes inserts (M6 x 1.0 mm) for attaching casters (not included). For casters, purchase 3-inch, 76 mm x 44 mm mounting pattern, 150 lbs.-rated, swivel or non-swivel casters. Follow the caster manufacturer's installation instructions.

Note: Do not reuse the screws provided with the TX18S for caster installation. Consult the caster manufacturer's guidelines for appropriate screws for M6 x 1.0 mm inserts.

2.3 Sound Level

Exposure to extremely high noise levels can cause permanent hearing loss. The U.S. Occupational Safety and Health Administration (OSHA) has specified permissible exposure limits for noise levels. According to OSHA, exposure to high sound pressure levels (SPL) in excess of these limits may result in hearing loss. Use hearing protection when operating equipment that generates high SPL.

3.0 Setup

3.1 System Power Sequencing

Proper power sequencing helps prevent audible thumps, clicks, and other noises in the system.

Note: Read the Safety & Warranty Manual before using the TX Sub.

Powering On:

1. Turn down the output level controls on your audio sources and processors (CD players, mixers, etc.) and power them on.
2. Turn the Volume knob on the TX SUB to -∞.
3. Turn on your loudspeakers.
4. Bring up the faders or level controls on your mixer and start playing your audio source.
5. Raise the Volume knob on the TX SUB to a comfortable level.

Powering Off:

1. Turn down the TX SUB Volume knob to -∞.
2. Power off the subwoofer.
3. Turn off all audio source devices and processors.

3.2 Connection Diagram

Items not listed under the (1.1) Box Contents are sold separately.

Example A: 1 Subwoofer & 2 Loudspeakers

Connect the left and right outputs of your mixer to the inputs of your subwoofer, and then connect the Thru Outputs of the subwoofer to the input of each loudspeaker.

Diagram Description: A mixer is connected to a TX125 subwoofer via its inputs. The subwoofer's Thru Outputs are then connected to two Alto TX408 loudspeakers. Power connections are shown for all units.

Example B: 2 Subwoofers & 2 Loudspeakers

Connect the left and right outputs of your mixer to an input on each speaker, and then connect the Mix Output of each speaker to an input on each subwoofer.

Diagram Description: A mixer is connected to two Alto TX408 loudspeakers via their inputs. The Mix Outputs of these loudspeakers are then connected to the inputs of two Alto TX125 subwoofers. Power connections are shown for all units.

4.0 Features

4.1 Rear Panel

Diagram Description: The rear panel of the Alto TX125 powered subwoofer is shown with various controls and connections labeled A through J.

• A. Power Input: Connect the included power cable here and to a power source. Ensure the Power Switch is OFF when plugging/unplugging.
• B. Fuse: If the fuse is blown, power off the unit, disconnect from the outlet, and replace with a fuse of the same rating. Using an incorrect rating may damage the unit.
• C. Power Switch: Turns the subwoofer on and off. Set Volume to -∞ before powering on.
• D. Channel Inputs 1/2 (1/4" / XLR): Connect your sound source using XLR, TS, or TRS cables. Input 1 is left, Input 2 is right.
• E. Thru Outputs 1/2 (XLR): Connect to loudspeakers using XLR cables. Input 1 signal goes to Thru Out 1, Input 2 signal goes to Thru Out 2.
• F. Volume: Adjusts the subwoofer's output volume.
• G. Signal/Limit LED: Lights green for signal presence (flashes at lower levels, solid at higher levels). Lights red when output limit/protection is active. Reduce volume if the LED is continuously red.
• H. LPF (Low-Pass Filter): Selects the filter's center frequency: 120 Hz, 100 Hz, or 80 Hz.
• I. Voicing Mode: Selects the front-end EQ. MUSIC mode provides an enhanced low-frequency bump. LIVE mode offers less extreme low-frequency enhancement with emphasis on 60 Hz - 80 Hz for kick drum and bass guitar. The corresponding LED will illuminate after selection.
• J. Polarity Reverse: Reverses the subwoofer's phase output to compensate for low-frequency cancellation. Experiment with both settings to find the one that provides fuller bass response in your room.

5.0 Appendix

5.1 Technical Specifications

TX12S

TX18S

Specifications are subject to change without notice.

Bluetooth and wireless reception and range are affected by walls, obstructions, and movement. For optimal performance, place the product in the center of the room so it is unobstructed by walls, furniture, etc. Battery life may vary based on temperature, age, and volume usage of product.

5.2 Trademarks & Licenses

Alto Professional is a trademark of inMusic Brands, Inc., registered in the U.S. and other countries.

All other product names, company names, trademarks, or trade names are those of their respective owners.