Designed for commercial and industrial use, the CSMA 280 Commercial Series Mixer/Amplifier from JBL is a mixer/amplifier with eight mixer-channel inputs and two output channels. It’s capable of reaching 80W of peak power with 10W per channel. The unit’s front panel sports volume controls for each channel, as well as two master volume adjustment knobs, two sets of bass and treble controls, and a power switch. The volume controls are illuminated so they can be seen and operated in darkened environments.
The amplifier, capable of driving both eight and four Ohm loads, can be used with 70V and 100V distributed audio systems without the need for a separate transformer. On its back panel you’ll find euroblock connections for mic/line inputs, as well as unbalanced RCA inputs, speaker connections, dip switches for input routing, and more. The unit is also equipped with two RJ45 connectors for use with JBL CSR-V in-wall volume controls (available separately).
FEATURES
- For Commercial and Industrial Use
- 80W into 8 or 4 Ohm Loads
- 10W Per Channel
- 8 Input Channels, 2 Output Channel
- Usable with 70 & 100V Systems
- Euroblock Mic/Line & RCA Inputs
- Hi-Z & 27V Phantom Power Switches
- Sleep Mode & 2 Auxiliary Outputs
- Voice Activated Ducking & Priority Mute
SPECIFICATIONS
Key Specs
| Number of Channels | 8 Input / 2 Output |
| Amplifier Power Rating | 4 Ohms / 8 Ohms:
80 W Peak per Channel (1 kHz, 0.5% THD)
10 W RMS per Channel |
| Load Impedance / Voltage | 4 Ohms (Minimum)
70 V (60 Ohms Minimum)
100 V (120 Ohms Minimum) |
| Audio I/O | 2x Block 5-Pin Balanced Line/Mic Input
6x Block 3-Pin Balanced Line/Mic Input
6x Stereo RCA 5-Pin Unbalanced Summed-Mono Input
2x Block 3-Pin Balanced Aux Output |
| Rackmount Size | 1 U |
Amplifier
| Form Factor/Type | Rackmount |
| Number of Channels | 8 Input / 2 Output |
| Amplifier Power Rating | 4 Ohms / 8 Ohms:
80 W Peak per Channel (1 kHz, 0.5% THD)
10 W RMS per Channel |
| Load Impedance / Voltage | 4 Ohms (Minimum)
70 V (60 Ohms Minimum)
100 V (120 Ohms Minimum) |
Performance
| Frequency Response | Amplifier:
20 Hz to 20 kHz ±2 dB (Low-Z)
80 Hz to 15 kHz ±2 dB (70/100 V)
Line Output:
20 Hz to 20 kHz ±1 dB |
| Input Sensitivity | Mic:
3 mVrms
Line:
775 mVrms
RCA:
300 mVrms |
| I/O Impedance | Mic Input:
400 Ohms
Line Input:
20 Kilohms (Balanced)
RCA Input:
50 Kilohms |
| Output Level | Line Output:
5 Vrms (10-Kilohm Load) |
| Insertion Loss | 1 dB Maximum |
| SNR | > 90 dB |
| THD | < 0.5% (20 Hz to 20 kHz, Main Output)
0.05% (Line Output) |
| Crosstalk | -70 dB (1 kHz) |
Connectivity
| Audio I/O | 2x Block 5-Pin Balanced Line/Mic Input
6x Block 3-Pin Balanced Line/Mic Input
6x Stereo RCA 5-Pin Unbalanced Summed-Mono Input
2x Block 3-Pin Balanced Aux Output |
| Other I/O | 2x RJ45 Remote/Volume |
| Phantom Power | 27 VDC |
Power
| AC Input Power | 100 to 240 VAC, 50 / 60 Hz |
| AC Power Connector | 1x IEC |
Physical
| Rackmount Size | 1 U |
| Operating Conditions | 32 to 95°F / 0 to 35°C up to 95% Humidity |
| Storage Conditions | -4 to 185°F / -20 to 85°C |
| Dimensions | 17.2 x 1.7 x 11.9″ / 436.9 x 43.2 x 302.3Â mm |
| Weight | 11.9Â lb / 5.4Â kg |
Packaging Info
| Package Weight | 16 lb |
| Box Dimensions (LxWxH) | 20.5 x 16.3 x 5.2″ |
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