AT-025 - Controller TOA - Free user manual and instructions

Product Type	Audio Controller
Brand	TOA
Model	AT-025
Category	Controller
Dimensions (W x H x D)	482.6 x 88.1 x 250 mm
Weight	3.5 kg
Power Supply	AC 100-240 V, 50/60 Hz
Power Consumption	15 W
Audio Inputs	4 balanced mic/line inputs (XLR)
Audio Outputs	2 balanced zone outputs (XLR)
Control Functions	Volume, tone (bass/treble), zone selection
Indicators	Power, signal, overload LEDs
Mounting	19-inch rack mountable (2U)
Protection	Overload, short circuit, thermal
Operating Temperature	0°C to 40°C
Humidity Range	20% to 80% (non-condensing)
Material	Steel chassis, aluminum front panel
Color	Black
Certifications	CE, RoHS
Included Accessories	Power cord, rack mounting brackets
Maintenance	Clean with a soft dry cloth; avoid solvents
Spare Parts Availability	Contact TOA or authorized dealers

Frequently Asked Questions - AT-025 TOA

How do I connect the AT-025 to a sound system?

Connect your audio sources to the balanced mic/line inputs (XLR) and route the outputs to your amplifiers or zone speakers via the zone outputs. Use balanced cables for best noise rejection.

Can I use the AT-025 with 70V/100V speakers?

The AT-025 is a line-level controller and does not have built-in amplification. It outputs line-level signal, so you will need an external amplifier that supports constant voltage systems (70V/100V) to drive such speakers.

How do I adjust the tone (bass/treble)?

Use the tone control knobs on the front panel. Turn the BASS knob clockwise to increase low frequencies and counterclockwise to decrease. Similarly, the TREBLE knob adjusts high frequencies.

What does the overload LED indicate?

The overload LED lights up when the input signal is too strong, which may cause distortion. Reduce the input level using the gain trim or lower the volume to prevent clipping.

How do I mount the AT-025 in a rack?

The AT-025 is designed for 19-inch rack mounting and occupies 2U of rack space. Use the included rack mounting brackets and screws to secure it in the rack.

Can I daisy-chain multiple AT-025 units?

Yes, you can daisy-chain the control signals via the link connectors (if equipped). However, each unit requires its own power connection. Refer to the manual for specific wiring.

What is the maximum input level?

The maximum input level for the mic/line inputs is +24 dBu. Exceeding this may trigger the overload protection.

How do I clean the AT-025?

Disconnect power and use a soft dry cloth to wipe the front panel and chassis. Do not use abrasive cleaners or solvents, as they may damage the finish.

What should I do if the unit does not power on?

Check the power cord connection and ensure the outlet is live. Verify the power switch is on. If still no power, contact TOA support for assistance.

Where can I get spare parts or repairs?

Spare parts and repairs should be handled by TOA authorized dealers or service centers. Contact TOA customer service for a list of approved providers in your region.

USER MANUAL AT-025 TOA

TOA's volume control attenuators provide precise level adjustment to single or multiple speaker lines. They are available in 25W or 100W models with a Decora-style wall plate. AT-100EMG is equipped with a 24VDC@15mA relay for applications that require emergency and paging signals to bypass/override the attenuator. AT-10K is a 10k ohm linear taper control for single-point remote level adjustment of voltage controlled amplifiers such as TOA's M-900MK2, A-900MK2, M-9000M2, A-9000M2, A-700, ΩG-2000, ΩA-200, AV-20D series mixers/amplifiers.

2. WIRING DIAGRAMS

AT-025 / AT-100

To speaker(s) with transformer(s)
Speaker line
(25V, 70V, or 100V)
from amplifier

AT-100EMG

To speaker(s) with transformer(s)
To switched 24VDC source
(class 2 wiring)
Speaker line
(25V, 70V, or 100V)
from amplifier

AT-10K

Typical Hook-up

graph LR
    A["Input"] --> B["CTRL"]
    A --> C["COM"]
    B --> D["+V Output"]
    C --> D
    D --> E["Amplifier / VCA Module"]
    F["Gnd, Com, or"] --> E

3. SPECIFICATIONS

Model AT-025		AT-100 AT-	100EMG AT-10K
Input Capacity 25W		100W 100W		-
Attenuation	13 steps (0dB, -3dB, -6dB, -9dB, -12dB, -15dB, -18dB, -21dB, -24dB, -27dB, -30dB, -33dB, OFF)			Continuous 10kΩ
Wire Capacity	14-gauge
Priority Relay -		-	24VDC@15mA	-
Finish	White plate & sub-plate / Decora-style
Dimensions Plate	Width 2.75"Plate Height 4.5"A: 1.75"B: 2.5"C: 1.875"	Plate Width 2.75"Plate Height 4.5"A: 1.812"B: 2.5"C: 1.875"	Plate Width 2.75"Plate Height 4.5"A: 2.125"B: 2.5"C: 1.875"	Plate Width 2.75"Plate Height 4.5"(see below drawing)

AT-025 / AT-100 / AT-100EMG

AT-10K