Package Includes:

• (1) JBL CSMA280 Commercial/Restaurant 2 x 80w Amplifier 4ohm/8ohm/70V/100V, 8 inputs
• (16) Rockville DCS8T 70V Commercial 8" Drop Ceiling Tile Speaker For Office/Business

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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.

Controls

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.

Manufacturing

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

Features:

• 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

Specifications:

• 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

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Video of DCS8T:

Description of DCS8T:

The DCS8T is the perfect solution to quickly and easily add speakers to rooms with standard drop ceiling tiles that measure 2 feet by 2 feet. Simply remove the ceiling tile where you want to put the speaker and put this one on its place. Run the speaker wire and you're installation is complete.

You can integrate this into any system that is either 70 volt, 100 volt, or even standard 8 ohm. The knob on the rear of the speaker allows you to select how many watts you will send to the speaker.

We tuned these speakers to sound perfect for both announcements and speeches while still sounding great for music playback.

Features:

• Rockville DCS8T 70V Commercial 8" Drop Ceiling Tile Speaker For Office/Business
• Built in 8” highly efficient speaker pre-mounted into a ceiling tile
• Easy installation fits perfectly into 2 feet x 2 feet standard-sized US drop ceilings. Simply drop it in and connect the speaker wire
• Metal grill
• Works for both 70 volt and 100 volt operation or even 8 ohm
• Multi-tap options: 10W, 5W, 2.5W, 8 Ohm
• 30 Watts RMS power handling at 8 ohms
• Low profile mounting depth (3.9”)
• Spring loaded speaker terminals
• Sensitivity: 91 dB
• Designed to sound great for speeches, announcements, music, and chimes
• 105° dispersion pattern

Specifications:

• Extremely efficient paper cone
• 1” Voice coil
• Aluminum former
• 10 oz. Ferrite Magnet
• High temperature copper voice coil windings
• Frequency Response (-10 dB): 170 Hz – 17 kHz
• Dimensions in inches: 23.8” x 23.8” x 3.9”
• Weight: 13.7 lbs

70V Power Options:

• 10w
• 5w
• 2.5w
• 1.5w

100V power options:

• 10w
• 5w
• 2.5w

8 Ohm power handling:

• 30w RMS

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 150 watts and you can install speakers that total around 120 watts. It does not matter if it is 12 speakers that are 10 watts each or 24 speakers that are tapped at 5 watts each.You always want your 70 volt amp to have at least 15 to 20% more power than the combined watts your speakers are tapped at.

When we say the word tap, we are referring to the switch that is located on the rear of these speakers where you can select how many watts you want the speaker to play. 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 6 watts, and the hallway or bathroom speakers at 3 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, sub-woofers, 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.