Bertom Air Shelf
Key Features
- Two-knob interface combining a decramped high shelf EQ, dynamic EQ, and transient shaper for focused high-frequency control
- Boost control applies a first-order high shelf centered at 20 kHz, fully decramped up to 21 kHz for artifact-free top-end enhancement
- Tame control targets only high-frequency spikes independently of overall signal level, pulling back harshness without dulling the mix
- Zero-latency processing suitable for tracking, live monitoring, and mix bus placement
- Native Apple Silicon support alongside Windows (32/64-bit) and Linux builds
- Pay-what-you-want pricing including a completely free download option
- Lightweight CPU footprint that can be stacked across multiple tracks without performance concerns
Description
Bertom Air Shelf is a dynamic EQ plugin designed to shape very high frequencies, mostly above 10kHz. It combines a decramped high shelf, a fast dynamic EQ, and a transient shaper into a two-knob interface that adds sparkle while controlling harshness.
The Boost knob applies a first-order high shelf centered at 20 kHz, fully decramped up to 21 kHz, which avoids the cramping artifacts that plague many digital EQs near the Nyquist frequency. The result is a smooth, natural-sounding lift in the highest octave of the spectrum.
The Tame knob operates as a hybrid between a very fast dynamic EQ and a transient shaper. Unlike conventional dynamic processors, it does not respond to overall signal level but targets only high-frequency spikes, pulling back harsh transients without dulling the rest of the signal.
Bedroom Producers Blog tested it on vocals and acoustic guitar, calling it an easy tool for enhancing the high-end whose boost/tame workflow can speed up a busy mixing session. Reddit users frequently compare it to Slate Digital's Fresh Air, noting that Air Shelf produces a smoother result.
Bertom Air Shelf operates with zero latency, making it suitable for tracking and live monitoring. It runs on Windows 7+, macOS 10.13+ (Apple Silicon native), and Linux (glibc 2.27+) in VST3, AU, and AAX formats.
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Frequently Asked Questions
How does Bertom Air Shelf compare to Slate Digital Fresh Air?
Both plugins add high-frequency enhancement, but Air Shelf provides more direct control through its separate Boost and Tame knobs. Fresh Air uses a two-band approach (Presence and Air) that enhances fixed frequency ranges. Reddit users describe Air Shelf as producing a smoother, more transparent result, while Fresh Air applies a more noticeable coloration.
What does the Tame knob actually do?
The Tame knob is a hybrid between a very fast dynamic EQ and a transient shaper. It only reacts to high-frequency spikes rather than the overall signal level, which means it pulls back harsh transients in the top end without affecting the rest of the frequency spectrum or reducing overall volume.
What does decramped mean in the context of EQ?
Digital EQ filters typically lose accuracy near the Nyquist frequency (half the sample rate), causing a cramping effect where the curve droops instead of maintaining its intended shape. A decramped EQ corrects this so the filter behaves as expected even at the highest audible frequencies. Air Shelf is decramped up to 21 kHz.
Can Bertom Air Shelf be used for mastering?
Yes. The smooth high-shelf boost and dynamic taming make it well-suited for mastering applications where subtle high-frequency enhancement is needed without introducing harshness. Its zero-latency operation also means it works transparently in any signal chain position.
