Focusrite ADAT Setup: Solving Sample Rate Sync Issues
The Client’s Challenge
Expanding a home studio should be an exciting step, a moment where new creative possibilities open up. For this client, the goal was simple: to integrate a Behringer UltraGain Pro-8 ADA8000, adding eight much-needed microphone preamps to their Focusrite Scarlett 18i20 via an ADAT connection. It’s a classic, powerful setup.
But instead of a seamless expansion, they were met with frustrating silence. The new channels weren’t showing up, no audio would pass through, and the system felt unstable. Even when a connection seemed to be established, it would mysteriously drop, leading to a maddening cycle of rebooting, reinstalling drivers, and questioning every cable. The frustration was immense, turning a promising upgrade into a source of technical dread.
System Overview
- Audio Interface: Focusrite Scarlett 18i20
- External Preamp: Behringer UltraGain Pro-8 ADA8000
- Connection: ADAT Lightpipe
- DAW: Logic Pro
- Primary Symptom: No audio signal from the Behringer, intermittent connection, and settings not ‘sticking’.
Diagnosis: The Invisible Conductor
This wasn’t a case of faulty hardware, but a subtle conflict in the hierarchy of digital audio control—a classic edge case where three different components were vying for authority.
My initial investigation confirmed the basics were being addressed. The client understood that for two digital audio devices to communicate, they must speak the same language at the same speed. This is governed by two settings:
1. Clock Source
One device must be the ‘master’ timekeeper, and the other must be the ‘slave’. When connecting an external preamp *into* an interface, the interface must be set to listen for the incoming clock. For Focusrite, this means setting the Clock Source in Focusrite Control to ‘ADAT’.
2. Sample Rate
Both the master (Behringer) and the slave (Focusrite) must be set to the exact same sample rate (e.g., 48kHz). A mismatch will result in no audio, or at worst, digital clicks and distortion.
The client had these settings correct initially. However, a simple accident—a loose ADAT cable—sent the troubleshooting process down a misleading path. In the process of reconnecting and reinstalling drivers, the Focusrite’s sample rate was reset to its default of 44.1kHz. This created an obvious mismatch with the Behringer, which was still set to 48kHz.
But here is the crucial discovery: even after we manually set the Focusrite back to 48kHz in its control software, the setting wouldn’t hold. The moment we opened Logic Pro, an invisible hand was changing the sample rate back to 44.1kHz.
The true culprit wasn’t the hardware or the drivers; it was Logic Pro’s project settings assuming ultimate authority over the audio interface, overriding our manual configuration without any warning.
The Fix: Establishing the Chain of Command
The solution was to configure the system in the correct order, ensuring the DAW’s settings were the final word, not the first casualty. Here is the definitive sequence to ensure a stable ADAT connection with a Focusrite interface and Logic Pro.
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1
Secure Physical Connections
Ensure a single ADAT Lightpipe cable runs from the Behringer’s ADAT OUT to the Focusrite’s ADAT IN. Check that both ends are clicked securely in place.
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2
Set Hardware Sample Rate
On the front panel of the Behringer UltraGain, set the sample rate switch to your desired session rate. For this client, it was 48k.
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3
Configure Focusrite Control
Open the Focusrite Control software. Set the Clock Source to ADAT. Then, set the Sample Rate to match the Behringer (48kHz). You should see the ‘Locked’ status indicator light up, confirming a successful sync.
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4
Set the DAW Project Settings
This is the critical step. Open your project in Logic Pro. Navigate to File > Project Settings > Audio. In this window, ensure the Sample Rate is also set to 48kHz. This command tells Logic to operate at the same rate as the hardware, preventing it from overriding your settings.
Additional Reflections: The Hierarchy of Control
This case is a perfect illustration of the ‘Hierarchy of Control’ in a modern digital studio. It’s not enough to simply connect cables; we must understand which piece of software or hardware has the final say.
Think of it like this: The external preamp (Behringer) sets the initial tempo. The audio interface (Focusrite) is the bandleader, listening to that tempo and telling the rest of the band to follow. But the Digital Audio Workstation (Logic Pro) is the conductor of the entire orchestra. When the conductor steps onto the podium and opens their score, their specified tempo (the project’s sample rate) overrides whatever the bandleader had previously established.
The mistake is trying to argue with the conductor by talking to the bandleader. The solution is to ensure the conductor’s score matches the tempo everyone has already agreed upon. By setting the sample rate correctly within Logic’s Project Settings, you give the final, authoritative command, ensuring all devices fall into perfect sync and remain stable for the entire session.
If you are seeking professional assistance with a Focusrite ADAT setup, sample rate mismatch, or other complex clocking issues with your audio interface, one-on-one remote support services are available from Audio Support.
