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miniDSP users often ask how to preserve ultra‑low frequency content when using Dirac ART. The “infra‑bass bypass” feature allows subwoofers capable of playing below 20 Hz to reproduce those signals, ensuring tactile bass energy isn’t lost.

What’s the Issue?

• Dirac ART applies a steep high‑pass filter at 20 Hz.
• This means recordings with content below 20 Hz won’t reach your subs, even if they can reproduce it.
• Other Dirac modules (Room Correction, Bass Control) don’t impose this limit, but ART does.

The Solution: Infra‑Bass Bypass

• An optional checkbox enables infra‑bass bypass for each channel group.
• It becomes available when the low‑end support range of a group is dragged down to 20 Hz.
• When enabled, a low‑passed version of the input is sent to subs capable of infra‑bass reproduction.
• The target curve defines the infra‑bass level, and all opted‑in subs share the content equally.

Recommended Use

• Group subs by capability. If you have subs with very different low‑end limits, separate them into distinct channel groups.
• Enable bypass only for subs that can genuinely play below 20 Hz.
• Leave bypass off for subs that cannot, to avoid distortion or wasted energy.

Limitations

• Because infra‑bass bypass isn’t phase‑corrected, you may see a small bump or dip around 20 Hz in measurements.
• This effect is usually felt rather than heard, so it rarely impacts listening.
• If needed, you can smooth it out using the advanced target curve editor (e.g., adding a notch at 20 Hz).

Summary Table

Takeaway

For systems with infra‑capable subwoofers, enabling infra‑bass bypass ensures you don’t lose the deepest bass content when using Dirac ART. Proper grouping and careful calibration are key to maximizing performance.