ART HVA4

Product overview

The ART HVA4 is a four-channel Class D amplifier for 70 V and 100 V installations that delivers 270 watts per channel.

Each channel has an independent level control and status LEDs for signal activity, clipping and thermal protection, and its operation mode (70 V or 100 V line) is selected with rear DIP switches. With a robust feature set in a 1U rackmount enclosure, the HVA4 offers a built-in limiter, an internal fan and Euroblock connectors for audio, status and control signals: the outputs can be disabled remotely, a priority input lets a test or alarm signal override the programme on all outputs, and a failure status output reports when the unit is disabled or in protect mode.

Key features

• 4-channel Class D power amplifier (switching power)
• Switchable 70 V / 100 V operation
• 270 W per channel
• Euroblock connectors for input, output, status and control
• Built-in limiter
• Short circuit, thermal and power on / off muting protection
• Remote disable, priority test / alarm input and failure status output
• Front mounted level controls and Signal, Clip, Protect and Power LEDs
• 1U rackmount, 19 inch

Front panel

The front panel carries the power switch, a level control for each channel and the indicators: the Signal LED (green) shows signal present in the channel, the Clip LED (red) shows that the input signal is too high and the Protection LED turns red in thermal protection, when the speaker load is disconnected from the amplifier outputs until the amplifier is back at a safe temperature. The Power / Protect LED in the level control is green in normal operation and red in protect mode. Air is drawn in through the front grilles for the variable-speed internal fan and exhausted through the rear vents.

Rear panel and control pins

The Euroblock input takes balanced or unbalanced signals for CH A to CH D, and the speaker outputs are also on Euroblock connectors. The control pins of the input block are Fail (failure status output: normally +5 V, 0 V if the unit is disabled or in protect mode), DIS (grounding it disables the amplifier and lights all protection lights), PRI (grounding it gives the Test input priority; the level knobs then turn from green to red), Test (the test / alarm signal that overrides all inputs and appears on all outputs when priority is active) and GND. The mains input with its fuse holder sits on the right.

Applications

ART's manual shows the HVA4 driving four zones of 100 V line loudspeakers connected in parallel, with a separate audio source for each zone or the same audio on all zones, plus a priority control and a test / alarm source wired to the control pins.

In the box

• HVA4 power amplifier
• Power cord (determined by the country of operation, per the owner's manual)

ART HVA4: frequently asked questions

Can the HVA4 run 70 V and 100 V lines?

Yes. The operation mode (70 V or 100 V) is selected for each channel with the rear DIP switches.

How much power does it deliver?

270 W per channel, on 70 V or 100 V lines, with all channels driven.

Can a paging or alarm signal override the music?

Yes. When the PRI pin is grounded, the signal on the Test input has priority, overrides all inputs and is present on all outputs.

What mains voltage does it need?

ART's manual states AC 110-240 V, 50/60 Hz.

Where can I buy the ART HVA4 in India?

The ART HVA4 is available from Shivansh Electronics, Kolkata, West Bengal, India, with delivery across India.

Workflow 1: Four-zone 100 V background music

Shops, restaurants, hotels and offices with up to four loudspeaker zones.

Connections

Setup

1. Set the DIP switches of all channels to 100 V.
2. Wire the loudspeakers of each zone in parallel to its output.
3. Set each zone's level with the front controls.

Tip: The same source can also feed all zones.

Workflow 2: 70 V line installation

Installations designed for 70 V loudspeaker lines.

Connections

Setup

1. Set the operation mode DIP switches to 70 V.
2. Connect the loudspeaker lines to the Euroblock outputs.

Tip: The mode is selected for each channel, so channels can be set to 70 V or 100 V individually.

Workflow 3: Alarm or test signal with priority

Systems where an alarm or announcement must override the programme.

Connections

Setup

1. Wire the alarm signal to the Test pin.
2. Ground the PRI pin through the priority contact when the alarm must play.

Tip: With priority active, the level knobs turn from green to red.

Workflow 4: Remote disable

Installations with a central control system.

Connections

Setup

1. Ground the DIS pin to disable the amplifier.
2. Disable the unit or power it down before connecting or disconnecting speaker loads.

Tip: All protection lights come on while the amplifier is disabled.

Workflow 5: Failure monitoring

Integrators who need a status signal from the amplifier.

Connections

Setup

1. Read the Fail output: normally +5 V.
2. Treat 0 V as unit disabled or in protect mode.

Tip: The Fail output is part of the Euroblock input connector.

Workflow 6: Rack installation

Installers mounting the HVA4 in a 19 inch rack.

Connections

Setup

1. Keep the front grilles and rear exhaust vents clear.
2. Use the mains voltage setting that matches the supply (AC 110-240 V, 50/60 Hz per ART).

Tip: Air flows in through the front, through the heat sink and out of the rear vents.