Atlas Sound DPA-AMIX – 4-Input Analog Mixer Card for DPA Amplifiers

Product Overview

The Atlas Sound DPA-AMIX is an analog mixer accessory card engineered for use with Atlas Sound DPA Series amplifiers equipped with a rear-panel accessory card slot. This 4-input mixer card gives installers a compact, rack-integrated mixing solution for commercial distributed audio systems, eliminating the need for a standalone mixer in fixed-install environments. Designed for boardroom audio, house of worship systems, and commercial paging applications, the DPA-AMIX supports both balanced microphone inputs and auxiliary stereo line sources in a single card format.

Product Description

The DPA-AMIX provides four discrete inputs: two balanced mic/line inputs and two auxiliary line inputs, all managed within the footprint of the DPA amplifier chassis. The two mic/line inputs are user-selectable and each include switchable 24V phantom power for condenser microphones, a 120Hz high-pass filter to reduce low-frequency noise and rumble, and an independent variable limiter to prevent clipping under dynamic speech or music conditions. The two auxiliary inputs feature a mono active summing circuit, allowing two stereo source devices — such as a media player and a laptop — to connect to the amplifier simultaneously without level conflicts. Each input has its own dedicated level control, providing straightforward gain structure for the system integrator. Signal and clip indicator LEDs on each input channel allow technicians to verify signal presence and identify overload conditions without test equipment. The card connects via removable terminal connectors, simplifying installation and future serviceability. Frequency response is rated at 20Hz to 20kHz ±1dB, ensuring the card does not color the audio signal passing through the amplifier chain. Total harmonic distortion is specified at 0.06% at 1kHz, meeting the accuracy requirements of professional fixed-install AV environments.

Key Features

• 2 Balanced Mic/Line Inputs — Accommodate condenser and dynamic microphones or balanced line-level sources with full flexibility.
• Switchable 24V Phantom Power — Powers condenser microphones directly from the card, removing the need for an external phantom power supply.
• 120Hz High-Pass Filter — Assignable per mic/line input to reduce HVAC rumble, handling noise, and low-frequency interference.
• Variable Input Limiter — Independent limiter on each mic input protects downstream amplifier stages from clipping during loud passages.
• 2 Auxiliary Line Inputs with Mono Summing — Active summing circuit combines two stereo sources to mono, supporting simultaneous connection of multiple playback devices.
• Per-Input Level Controls — Recessed gain trimmers on all four inputs allow precise signal balancing without accidental misadjustment.
• Signal and Clip Indicator LEDs — Visual status indicators on each channel simplify commissioning and system diagnostics in the field.
• Removable Connectors — Terminal block connectors detach from the card for pre-wiring and faster installation or replacement.
• Wide Frequency Response — 20Hz–20kHz ±1dB ensures transparent audio performance across voice and music program material.
• Low THD — 0.06% THD at 1kHz maintains signal integrity in professional commercial audio chains.

Typical Applications

• Boardroom
• Conference room
• House of worship
• Government space
• Commercial meeting space
• Multi-purpose room
• Training room

Technical Specifications

Frequently Asked Questions

Q: Which amplifiers is the DPA-AMIX compatible with?

A: The DPA-AMIX is designed for use with Atlas Sound DPA Series amplifiers that include a rear-panel accessory card slot. Verify your specific DPA model includes this slot before ordering.

Q: Can the DPA-AMIX power condenser microphones?

A: Yes. Each mic/line input includes switchable 24V phantom power to support condenser microphones without requiring an external power supply.

Q: Can two stereo sources connect at the same time?

A: Yes. The two auxiliary inputs feature a mono active summing circuit that combines two stereo sources simultaneously, allowing devices like a laptop and a media player to connect at once.

Q: What does the high-pass filter do?

A: The 120Hz high-pass filter removes low-frequency energy below 120Hz — such as HVAC noise or microphone handling rumble — from the mic/line inputs, improving speech clarity.

Q: Does the DPA-AMIX require external power?

A: No. The card draws power from the host DPA Series amplifier through the accessory card slot connection.

Q: What is the purpose of the variable input limiter?

A: The limiter on each mic input prevents signal peaks from clipping the amplifier's input stage, which is particularly useful for live microphone applications with unpredictable volume levels.

Q: Are the level controls accessible without removing the card?

A: Yes. All level controls are recessed on the card face and accessible through the amplifier's rear panel slot opening for adjustments during commissioning.