Mixer Amplifier
SR-A Series
Class-D mixer amplifiers — 250 W to 500 W with six mic inputs and five-zone output.
Class-D mixer amplifiers rated from 250W to 500W, with six microphone inputs and an aux line input. Individual gain controls cover line, aux and mic, with bass and treble tone control. Outputs serve 70V, 100V and 4–16 ohm loudspeakers across five zones with individual volume control, and a built-in MP3 player adds Bluetooth, FM, USB and SD playback.
250–500 W
Rated Output
6
Mic Inputs
5
Output Zones
70/100V & 4–16Ω
Speaker Output
BT/FM/USB
Media
Features
01
Six microphone inputs
Individual gain controls for line, aux and mic sources with bass and treble tone control.
02
Five-zone output
Each zone has its own volume control, with echo, delay and repeat available across all zones.
03
Built-in media player
MP3 playback with Bluetooth, FM and remote control, plus USB and SD card support.
04
Protected and cooled
Short-circuit, overload and high-temperature protection with an auto-start variable-speed fan.
Specifications — SR-A Series Range
| Specification | A250B(B) | A350B(B) | A450B(B) | A500B(B) |
|---|---|---|---|---|
| Rated power output | 250 W | 350 W | 450 W | 500 W |
| Speaker output | 70 V, 100 V and 4–16 Ω | 70 V, 100 V and 4–16 Ω | 70 V, 100 V and 4–16 Ω | 70 V, 100 V and 4–16 Ω |
| Mic input | −55 dB / 600 Ω, unbalanced phone jack | −55 dB / 600 Ω, unbalanced phone jack | −55 dB / 600 Ω, unbalanced phone jack | −55 dB / 600 Ω, unbalanced phone jack |
| Aux input | −14 dB / 10 kΩ, unbalanced RCA | −14 dB / 10 kΩ, unbalanced RCA | −14 dB / 10 kΩ, unbalanced RCA | −14 dB / 10 kΩ, unbalanced RCA |
| Tone control | Bass ±10 dB at 100 Hz; treble ±10 dB at 10 kHz | Bass ±10 dB at 100 Hz; treble ±10 dB at 10 kHz | Bass ±10 dB at 100 Hz; treble ±10 dB at 10 kHz | Bass ±10 dB at 100 Hz; treble ±10 dB at 10 kHz |
| Frequency response | 40 Hz–18 kHz (+1/−3 dB) | 40 Hz–18 kHz (+1/−3 dB) | 40 Hz–18 kHz (+1/−3 dB) | 40 Hz–18 kHz (+1/−3 dB) |
| S/N ratio | Mic 1–3: 70 dB; Aux 1–2: 85 dB | Mic 1–3: 70 dB; Aux 1–2: 85 dB | Mic 1–3: 70 dB; Aux 1–2: 85 dB | Mic 1–3: 70 dB; Aux 1–2: 85 dB |
| THD | <0.05% at 1 kHz, 1/3 rated power | <0.05% at 1 kHz, 1/3 rated power | <0.05% at 1 kHz, 1/3 rated power | <0.05% at 1 kHz, 1/3 rated power |
| Mute function | Mic 1 priority over Mic 2–4 and Aux 1–2 | Mic 1 priority over Mic 2–4 and Aux 1–2 | Mic 1 priority over Mic 2–4 and Aux 1–2 | Mic 1 priority over Mic 2–4 and Aux 1–2 |
| Media support | USB drive up to 16 GB | USB drive up to 16 GB | USB drive up to 16 GB | USB drive up to 16 GB |
| Connections | 3-pin XLR balanced for external microphones | 3-pin XLR balanced for external microphones | 3-pin XLR balanced for external microphones | 3-pin XLR balanced for external microphones |
| Channel crosstalk attenuation | 50 dB | 50 dB | 50 dB | 50 dB |
| Protection | High temperature, overload, short circuit | High temperature, overload, short circuit | High temperature, overload, short circuit | High temperature, overload, short circuit |
| Power supply | 110V/60Hz or 230V/50Hz | 110V/60Hz or 230V/50Hz | 110V/60Hz or 230V/50Hz | 110V/60Hz or 230V/50Hz |
| Dimensions | 480 × 270 × 88 mm | 480 × 270 × 88 mm | 480 × 270 × 88 mm | 480 × 270 × 88 mm |
All figures are nominal, per manufacturer data.
Applications