JBL CSMA280 Commercial/Restaurant 70v Amplifier+(8) Black 6.5" Wall Speakers

$2,615.08 $1,093.95 Save 58%
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Product Description
Package Includes:
  • (1) JBL CSMA280 Commercial/Restaurant 2 x 80w Amplifier 4ohm/8ohm/70V/100V, 8 inputs
  • (8) Rockville WET-6B 70V 6.5" IPX55 Commercial Indoor/Outdoor Wall Speakers - Black

Description of CSMA280:

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).

This Commercial Series mixer/amplifier boasts such features as voice activating ducking (useful for paging over background music), priority muting for channels one and five, and a sleep mode which automatically powers down the unit when no audible signal has been received for longer than 30 minutes. Also, with two auxiliary outputs, you may connect to an additional amplifier, though the master volume and tone controls will have no bearing on the resulting signal.

Channel Modes

8 inputs with 2 outputs of 80W of power.


Independent Bass and Treble controls for each output channel.
Input level and output volume controls.

Hi-Z Switch
The Hi-Z switch will switch in the built-in output transformer allowing the unit to drive 70V or 100V speaker systems directly when connected to the appropriate output terminals.

Phantom Power
Phantom power (27 V) can be applied to all mic inputs by turning on Phantom Power within the dip switches.

VOX Function

Voice activated ducking is available on input channel 1 and channel 5. The audio input level required to activate ducking is set using the trim pot on the rear panel. Adjusting in the counter-clockwise direction will reduce that level, while the full clockwise setting will disable the VOX function.

Priority Muting

Channels one and five may be used as priority channels, muting all other channels when pins 4 and 5 are shorted using a switch closure. If the amplifier has entered sleep mode due to inactivity, invoking priority will also bring the unit out of sleep and ready for transmitting an announcement.

Remote Volume Control

Remote volume control can be implemented using a CSR-V controller connected via an Ethernet cable to the RJ45 connector on the back panel.

Sleep Mode

This unit is designed to go into sleep mode after approximately 30 minutes operating with no signal at any of the inputs. Return of signal (-40 dBu or 7.75mVRMS) to any input will wake the unit. Also, a switch closure across the priority input pins will return the unit to normal operating mode.

AUX output

An auxiliary output that you may connect to additional amplifiers is available. The audio signal is the mix of the input channels. Note that the master volume control and tone controls will have no effect on the aux output signal.


Crown's DriveCore technology
HARMAN's GreenEdge environmental standards

Certifications and Approvals

Lead-free RoHS standards, utilizing recycled metals, and using an energy-saving powder coat process
Energy Star certified


  • JBL CSMA280 Commercial/Restaurant 2 x 80w Amplifier 4ohm/8ohm/70V/100V and 8 inputs
  • 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


  • Maximum Output Power: 800 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: 120 Ohms. 100 V Output: 240 Ohms.
  • Crosstalk: -70 dB @ 1 kHz
  • Controls:
  • 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
  • Indicators:
  • Front Panel:
  • 8 x Input signal presence ring, green
  • 2 x Output volume ring, green
  • 1 x Power switch ring, green/blue
  • Connectors:
  • Rear Panel:
  • 1 x IEC power input
  • 2 x Aux out connection points
  • 6 x 3-pin euroblock connectors
  • 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 (W x D x H): 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

How to Set Up Your 70 Volt Speakers:
Video of WET Series :

Description of WET-6B: ?

This speaker features swivel brackets that allow you to mount the speaker to your wall. Attaching the speaker to the swivel bracket is quick and easy. Simply slide the speaker on to the bracket and tighten the knobs with a quick turn.Changing the swivel position is just as easy. You simply loosen the Knobs to change the position of the speaker while it is on the bracket.

IPX55 rated!
These speakers are IPX55 rated. This means you can install them indoors or outdoors. They can withstand heavy rain, moisture, sun,dust, and even jet streams of water hitting the speaker from multiple angles. We went above and beyond in terms of product development to get these speakers IPX55 rated. The cabinets were upgraded to a high-end waterproof ABS material. In addition, we added a special cloth material to the speaker to blockwater from going entering the vent. The grill is made of aluminum and will never rust from outdoors use. We used Stainless steel brackets to ensure that the brackets wouldn’t rust either. Even the speaker wire terminals are waterproof and rustproof!

Vented design has kicking bass!
This is one of the only indoor/outdoor 70V speakers on the market with a vented design and an IPX55 rating. These will give you amazing bass response and great full range sound quality at low or high volume.

What is 70 volt ?
70 volt systems are the number one choice for applications where you want to install many speakers. With 70 volt there are a lot of advantages over 8-ohm systems. One of the main advantages is the simplicity of the wiring as well as how easy it is to match up speakers with the amplifier. For example, you can buy one 70V amplifier with 350 watts and you can install speakers that total close to 300 watts. It does not matter if it is 15 speakers that are 20 watts each or 50 speakers that are tapped at 5 watts each. You always want your 70 volt amp to have at least 15 or 20% more power than the combined watts your speakers are tapped at.

When we say the word tap, what we are referring to are the selectors these speakers have on them. For example, these speakers have selectable options of 2.5w, 5w, 10w, 20w. What this does is limit how many watts the built-in transformer on the speaker will allow the speaker to get from the amplifier. This gives you full customization over the sound for your space. In a restaurant for example you can tap your dining room speakers at 5 watts, the speakers by the bar area at 20 watts, and the ones in the hallway at 2.5 watts.

Another great feature with 70 volt is you can mix and match any 70 volt speakers whether they are ceiling speakers, wall mounted speakers, subwoofers, etc.
70 volt systems allow you to run very long lines of speaker wire without signal loss. This is ideal when running long speaker leads.
The wiring is simple. You just wire all the positive terminals of the speakers to the positive 70 volt terminals of the amplifier. The negative terminals on the speaker simply get wired to the negative terminals on the amp. You do not have to worry about impedance. The power is constant.


  • Rockville Wet-6B 6.5" Commercial/Restaurant 70V or 8 Ohm Wall Mount Speaker
  • IPX55 rating makes this perfect for outdoor use or indoor use
  • IPX55 means this can withstand jet streams spraying it from any angle without any damage
  • Rugged ABS cabinet is waterproof
  • Vented enclosure with waterproof vent (water can’t get in but sound can get out)
  • Aluminum grill is waterproof and rustproof
  • Waterproof protective cloth blocks water from going into the vent
  • Swivel wall bracket with quick release and tightening knobs
  • Weather resistant
  • 6.5” Woofer with Polypropylene cone
  • 1” Mylar dome tweeter is very efficient and has great sound
  • Frequency Response: 60Hz – 20Khz
  • Sensitivity: 88dB
  • RMS Power: 50w (when using 8 ohm)
  • Nominal impedance: 8 Ohm
  • 5-way binding post terminals
  • Built in transformer supports 70V and 100V installations
  • Built in tap switch to easily select your 70V or 100V power
  • Color: Black
  • Weight: 6.8 Lbs each
  • Cabinet dimensions: 11.4” x 8.5” x 9.4”

There is a tap switch on the speaker so you can easily select how many watts you want the speaker to get from the amp.

70V Power Options:

  • 20w
  • 15w
  • 10w
  • 5w
  • 2.5w

100V Power Options:

  • 30w
  • 20w
  • 10w
  • 5w

8 Ohm power handling:

  • 40w

Owner's manual

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