How to fix undesirable echo or phasing on Universal Audio Accessories?
- KKelly RamosSep 12, 2025
To resolve undesirable echo or phasing, ensure that only one input monitoring system is enabled, either Console or DAW, but not both simultaneously.

How to fix undesirable echo or phasing on Universal Audio Accessories?
To resolve undesirable echo or phasing, ensure that only one input monitoring system is enabled, either Console or DAW, but not both simultaneously.
Why can’t I hear preamp channels on my Universal Audio Apollo x8p?
If you cannot hear the preamp channels, first, ensure that the preamp gain is turned up for the channel(s) you are using. Also, check that MUTE is not engaged in the Console input channel strip.
| Type | Audio Interface |
|---|---|
| Analog Inputs | 8 |
| Analog Outputs | 8 |
| Connectivity | Thunderbolt 3 |
| A/D Resolution | 24-bit |
| Sample Rate | 192 kHz |
| Bit Depth | 24-bit |
| Built-in DSP | Yes |
| Form Factor | Rackmount |
| Phantom Power | Yes |
| USB Connectivity | No |
| ADAT Inputs | 2 x Toslink |
| ADAT Outputs | 2 x Toslink |
| Preamps | 8 |
Illustrates and labels the controls and indicators on the left side of the Apollo x8p front panel.
Details Hi-Z inputs, Preamp Gain knob, channel selection, and Unison Gain Stage Mode.
Details Word Clock connectivity and the crucial Thunderbolt 3 ports.
Describes monitor outputs and the female DB25 connector for line outputs.
Explains how to connect Apollo X to a computer via Thunderbolt 3.
Describes cascading multiple Apollo interfaces and UAD devices via Thunderbolt.
Describes the Console application for hardware control, mixing, and monitoring.
Provides detailed specifications for microphone, Hi-Z, line inputs, outputs, monitor outputs, and headphones.
Lists specifications for S/PDIF, ADAT, Word Clock, and synchronization sources.
Lists common symptoms and provides a checklist of items to confirm for troubleshooting.
Provides essential safety instructions for operating the Apollo x8p unit.
Information on how to contact UA support staff for technical or repair assistance.