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.

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

8 inputs with 2 outputs of 80W of power.

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

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

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.

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

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.

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

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

Related Questions and Answers

Q: 1. Will this work with an f8

A: Dimensions of the Zoom F8 are 7 x 5.5 x 2.1" and the interior of the ORCA OR-280 is 9.4 x 7.9 x 4.5" so the F8 will fit inside, but the bag is larger than needed. As a better option for a similar bag that is sized for the F8, you may like the ORCA OR-28 Mini Audio Bag for ZOOM F8, Zaxcom Max, Tascam DR70 & Other Recorders (B&H # OROR28), or the ORCA OR-27 Small Sound Bag (B&H # OR27), or the ORCA OR-272 Sound Bag for Zoom F4 and F8N (B&H # OR272), or the ORCA OR-30 Audio Mixer Bag (B&H # OROR30).

Q: 2. I want to make sure I understand this correctly, The 9' x 4" column will turn 360 degrees while the base says still? Is that correct?

A: Yes.

Q: 3. what orca 280 can for mixpre 10 ii ?

A: The ORCA OR-280 Audio Bag for MixPre-10 Mixer is compatible with the MixPre-10 ii.

Q: 4. Where can I get replacement headband padding for the Sennheiser HD280 Pro?

A: Please contact Sennheiswer directly for details: Sennheiser:Tel: (860) 434-9190 e-mail form: en-us.sennheiser{dot com}/contact-center

Q: 5. is there a difference between Orca Or-28 and orca Or-280?

A: There is a difference between the Orca OR-280, which has a larger internal size and is optimized for the Sound Devices MixPre 10, and the OR-28, which is smaller, and designed for the Zoom F8, Tascam DR-70, and other portable recorders of that size range.

Q: 6. Can this earphones be used in lap tops, T.V.s, and radios ?I dont understand about output or input specific measures. Do I need to get adapter cables.? Are they included in the box? Does the Polsen HMA-41 Amplifier work with an independent power connection?

A: The Sennheiser HD 280 Pro are designed to be able to function with a wide variety of devices from portable mp3 players to professional audio systems. The unit features a 1/8 jack compatible with most consumer products such as laptops, walkman and smartphones. The included 1/4 adapter will allow the use with home stereo receivers and professional audio equipment. The Polsen HMA-41, allows for the connection of up to 4 sets of headphones from a single input source, and does require power supplied by the included AC adapter.

Q: 7. does sennheiser hd 280 pro come with pouch or case?

A: The Sennheiser HD 280 Pro does not ship with case or pouch.

Q: 8. Detachable cable?

A: no

Q: 9. I have a Zoom h6, I would like to know if it fits vertically in this bag?

A: Yes it will. No microphone modules should be connected to the H6.

Q: 10. Are these suitable for portable devices or do they run batteries down quickly?

A: Yes, they are suitable for portable devices. I haven't noticed a difference in battery life while using the headphones.