Rated 4.9 (120 reviews)
The TOA AT-4120 is a 120W rotary volume attenuator for 100V line speaker systems, supplied with a surface back box. It gives 8 steps of level control down to off and includes a 24V DC override relay, so emergency or priority announcements can bypass the local volume setting. Typical uses are offices, classrooms, meeting rooms, restaurants and retail areas where each room needs its own background music level.
120W
Capacity
8 steps
Attenuation
24V DC
Override relay
100V
Line
Override needs 4 wiresThe 24V override relay and red LED only work on a 4-wire (3-wire signal plus override) connection. On a simple 2-wire run the unit works as a plain volume control and emergency calls follow the knob setting.
Features
120W input capacity on a 100V line
8-step attenuation: 0, -3, -9, -12, -15, -18 dB and off
24V DC override relay for emergency paging (4-wire connection)
Red LED shows when override is active
Large control knob
Clip-on face plate
Screw terminal block accepts 22 to 14 AWG cable
Back box (85.5 x 85.5 x 60 mm) and two plate fixing screws included
Specifications
| Input capacity | 120W |
| Attenuation | 8 steps: 0, -3, -9, -12, -15, -18 dB, off |
| Override voltage | 24V DC, 11 mA (4-wire connection only) |
| Override indicator | Red LED (4-wire connection only) |
| Terminals | 5 x screw terminals |
| Usable cable | 22 to 14 AWG |
| Finish | Knob and cover: ABS resin, white (RAL 9016 or equivalent); plate: surface-treated steel |
| Back box (supplied) | 85.5 x 85.5 x 60 mm (W x H x D) |
| Dimensions (W x H x D) | 86 x 86 x 51 mm |
| Weight | 0.48 kg |
