JBL CSMA 280 Commercial Series Mixer/Amplifier Used

JBL CSMA 280 Commercial Series Mixer/Amplifier Used

Out of stock

An item that has been used previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. Full manufacturer’s warranty and free one year extended warranty from Gigasonic.

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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