30W Class D Audio Amplifier with Dante® and Line/Mic Inputs

Can the VLDT-A2AM30 be powered exclusively via PoE, or is a separate power supply required?

The VLDT-A2AM30 supports both PoE+ (IEEE 802.3at, Class 4) and local DC power (24V/2A). When using PoE, amplifier power output is limited to protect the PoE source from overload. For full 30W amplifier performance (2x15W stereo or 1x30W bridged mono), the dedicated 24V DC power supply is recommended. PoE mode is ideal for installations where low-to-moderate audio levels are sufficient and simplified cabling is a priority, such as background music in small spaces or huddle rooms where running additional power cables is impractical.

What is the difference between Dante and AES67 modes, and which should I use?

Dante is a proprietary audio-over-IP protocol offering plug-and-play discovery, low latency, and extensive routing capabilities using Dante Controller software. AES67 is an open interoperability standard that allows the VLDT-A2AM30 to communicate with non-Dante networked audio devices. Use Dante mode for native Dante systems to take advantage of automatic device discovery and simplified configuration. Enable AES67 mode when integrating with multi-vendor AV-over-IP systems or when interoperability with standards-based devices is required. The unit supports 44.1kHz, 48kHz, 88.2kHz, and 96kHz sample rates at 16/24-bit depth in both modes.

How do I configure the DSP ducking feature for automatic background music reduction during announcements?

DSP ducking is configured through the web GUI interface. Access the amplifier's IP address via a web browser, navigate to the DSP processing section, and enable the ducking function. Set the primary source (typically the microphone input) as the trigger, and designate the secondary source (background music) as the target to be ducked. Adjust the ducking depth (how much the background level is reduced) and attack/release times (how quickly the reduction occurs and recovers). Typical settings for voice paging over music are 12-15dB reduction with 100ms attack and 500ms release for smooth, natural transitions that don't sound abrupt or jarring to listeners.

What speaker impedances are supported, and can I run different impedances on Channel 1 vs Channel 2?

The VLDT-A2AM30 supports both 4Ω and 8Ω speaker loads. In stereo mode, each channel delivers 15W into either impedance, and you can mix impedances between channels (for example, 4Ω speakers on Channel 1 and 8Ω speakers on Channel 2). In bridged mono mode, the combined output delivers 30W into a single 4Ω or 8Ω load connected across both channels. The amplifier includes protection circuitry to prevent damage from short circuits or impedance mismatches. For distributed speaker systems using 70V or 100V transformers, calculate the total load to ensure it doesn't drop below the minimum supported impedance of 4Ω.

Can I cascade multiple VLDT-A2AM30 units for larger installations, and what's the maximum delay I can set?

Yes, the VLDT-A2AM30 supports cascading through its balanced/unbalanced analog outputs. Connect the LINE OUT from a master unit to the LINE IN of downstream units to expand coverage. The master unit can control slave devices on the same network segment using the network control function. Each unit's audio output supports up to 50ms of adjustable delay for time-alignment in distributed systems. Dante device latency is separately configurable at 2, 3, 4, 5, or 10ms using Dante Controller. When cascading, consider cumulative latency across the signal chain and use the delay settings to synchronize audio arrival at different speaker zones for coherent sound reinforcement.

What control protocols are supported, and can the unit be integrated with third-party control systems?

The VLDT-A2AM30 offers multiple control options for flexible integration. RS-232 serial control supports API commands for integration with Crestron, Extron, AMX, and other professional AV control systems. TCP/IP network control enables integration with IP-based automation platforms. The web GUI provides browser-based configuration and monitoring accessible from any device on the network. Additionally, a 5-12V trigger input allows simple on/off control from wall panels, touch screens, or automation systems. Front panel buttons provide local control when network access is unavailable. VigilLink can provide protocol documentation for custom integration development upon request.

How does the 8-band parametric EQ work, and what are recommended settings for speech intelligibility?

The 8-band parametric equalizer provides precise frequency shaping with adjustable center frequency, gain (±15dB), and Q (bandwidth) for each band. For optimal speech intelligibility in typical commercial spaces, consider these starting points: apply a high-pass filter at 80-100Hz to reduce rumble, add 2-3dB boost around 3-4kHz to enhance speech clarity, reduce 200-400Hz by 2dB if the room sounds boomy, and apply a gentle low-pass filter above 12kHz to reduce sibilance. Room acoustics vary significantly, so use measurement tools like an RTA analyzer or rely on critical listening to fine-tune settings. The web GUI provides real-time EQ adjustment with visual feedback for immediate results.

What's the difference between the auto standby mode and the trigger input for disabling amplifier output?

Auto standby mode uses signal sensing to automatically power down the amplifier after a configurable period (0-100 minutes) of audio inactivity, reducing energy consumption when no program material is present. This is ideal for scheduled operation environments like offices that close at night. The amplifier automatically wakes when audio signal is detected. The trigger input provides external control to instantly disable amplifier output via a 5-12V high/low signal from automation systems, wall panels, or emergency systems. This is useful for integration with building management systems, emergency muting during fire alarms, or manual control scenarios. Both features can be used simultaneously, with the trigger input taking priority when activated.