JBL CSMA 280 Commercial Series Mixer/Amplifier

JBL CSMA 280 Commercial Series Mixer/Amplifier

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SKU: JBLCSMA280 Category:

JBL CSMA 280 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 CSMA 280 mixer/amp offers unmatched ease of use, with a clean, front panel featuring only volume controls for each channel, master volume adjustment, adjustable bass and treble controls and a power switch. All the volume controls are surrounded by an illuminated ring, making them easy to see and operate in darkened environments. The amplifier can drive 8 ohm and 4 ohm loads and can be used with 70V and 100V distributed audio systems without the need for a separate transformer. In addition to balanced mic/line inputs, unbalanced RCA inputs and speaker connections, the unit includes RJ45 connectors for use with JBL CSR-V in-wall volume controls. This Commercial Series mixer/amplifier features a universal power supply which enables the ability to accept AC voltages from 100 to 240 VAC, 50/60Hz.


8 inputs with 2 outputs of 80W of power

Ideal for commercial and industrial use

Fanless, space-saving 1U design

Sleek industrial look with illuminated rings, making them easy to see and operate

Euro-block type mic/line input connectors and output connectors

Independent Bass and Treble controls for each output channel

Supports 70V and 100V distributed audio systems without the need for a separate transformer

Remote volume control capability using JBL CSR-V module and standard Ethernet cable

Priority muting

Configurable output routing

Utilizes Crown’s DriveCoreTM technology providing excellent audio performance with high efficiency

Manufactured to lead-free ROHS standards, utilizing recycled metals, and using an energy-saving powder coat process

Includes rack mounting kit

Three-Year, No-Fault, Fully Transferable Warranty completely protects your investment

Energy Star® Certified


Maximum Output Power: 80 W per channel into 4 Ohms or 8 Ohms, 1 kHz, ≤ 0.5% THD

Insertion Loss: 1 dB maximum for 70 and 100 V outputs

Continuous Power: 10 W per channel

Line Output Level: 5.0 V RMS into 10 kOhms

Input Sensitivity
To obtain full rated power at 8 Ohms (or 5 VRMS to line output)

Mic Input: 3 mV RMS

Line Input: 775 mV RMS

RCA Input: 300 mV RMS

Number of Channels

Input: 8

Output: 2

Frequency Response

Measured at 2.83 V RMS into rated load impedance at any output

4/8 Ohms Output: 20 Hz – 20 kHz, ±2 dB

70 V/100 V Outputs: 80 Hz – 15 kHz ±2 dB

Line Out: 20 Hz – 20 kHz, ±1 dB

Total Harmonic Distortion (THD)

Measured at 2.83 V RMS into rated load impedance at any output

Power Amplifier Output: <0.5%, 20 Hz to 20 kHz

Line Output: 0.05% typical

Signal to Noise Ratio: > 90 dB

Nominal Input Impedance

Mic: 400 Ohms

Line: 20 kOhms (balanced)

RCA: 50 kOhms

Minimum Load Impedance

Low Impedance Output: 4 Ohms

70 V Output: 60 Ohms

100 V Output: 120 Ohms

Crosstalk: -70 dB @ 1 kHz


Front Panel:

8 x Input level rotary knobs

2 x Output volume-attenuating knobs

1 x Power switch

2 x Bass potentiometers

2 x Treble potentiometers

Rear Panel:

2 x Input-routing dip switches (including phantom and Hi-Z switches)

8 x Mic/Line selector switch

2 x Vox adjustment switches


Front Panel:

8 x Input signal presence ring, green

2 x Output volume ring, green

1 x Power switch ring, green/blue


Rear Panel:

1 x IEC power input

2 x Aux out connection points

6 x 3-pin euroblock connectors

2 x 5-pin euroblock connectors

6 x Dual RCA input connectors

2 x RJ45, remote volume

Operating Temperature / Humidity: 32 to 95°F / 0 to 35°C, 95% RH (non-condensing)

Storage Temperature: -4 to 185°F / -20 to 85°C

Phantom Power: 27 VDC

AC Input: 100-240 VAC, 50/60 Hz

Dimensions (WxDxH): 17.2 x 11.9 x 1.7″ / 436.9 x 302.3 x 43.2 mm

Weight: Approximately 11.9 lb / 5.4 kg

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