Overview
- NEPTUNE is a corrective audio signal processing software designed specifically to linearize both the frequency and group delay response of Apple EarPods.
- At the core of NEPTUNE is its custom-developed convolution engine, which is equipped with several highly optimized FIR correction filters and a highly realistic crossfeed algorithm to simulate free-field speaker listening.
- With emphasis on sound quality and performance, all NEPTUNE FIR filters have be fine-tuned for both pre-ringing and latency reduction.
- NEPTUNE is easy to use: simply wear your EarPods, then load the plug-in at the end of your master chain.
Use Cases
- Mixing & Mastering: NEPTUNE processing is designed to simulate a near-perfect studio listening environment. Work with confidence knowing that whatever you are hearing is an accurate reflection of your source audio.
- Real-Time Recording: With Zero Latency Mode, you can hear your take as it happens in full resolution, allowing you to make informed spontaneous adjustments of your recording equipment or technique.
- Casual Listening: NEPTUNE is designed to deliver sound as artists, producers and engineers intended it to be heard. Uncover all of the subtle sonic details that may have previously been obfuscated.

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Frequency Response Without NEPTUNE (45Hz - 20kHz)
Max: +21.1dB, Min: -10dB, Avg: +5.1dB
Frequency Response With NEPTUNE (45Hz - 20kHz)
Max: +3.5dB, Min: -5dB, Avg: -.9dB

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Group Delay Response Without NEPTUNE (45Hz - 20kHz)
Max: +3.44ms, Min: -130μs, Avg: +685μs
Group Delay Response With NEPTUNE (45Hz - 20kHz)
Max: +692μs, Min: -16μs, Avg: +18μs

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Without Crossfeed
- Without crossfeed processing (which applies to all headphone users without a software like NEPTUNE or CROSSFIRE), headphone listening, and specifically the stereo field, sounds unnatural. This often leads to a hyper-localized soundstage and exaggerated stereo separation.
Crossfeed Explained
- Crossfeed distinguishes speaker from headphone listening. In headphones, each ear receives its respective stereo channel directly. With speakers, low and mid-frequency sounds from both channels leak into both ears with a slight delay, known as the Inter-Aural Time Difference (ITD).
Perceptual Differences
- When crossfeed processing is applied, headphone listening sounds more natural and comparable to speaker listening. Specifically, low and mid-frequency sounds with stereo information will not give the impression of strict separation between the two audio channels.

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Hear the Difference

Experience the power of NEPTUNE firsthand by wearing your Apple EarPods or AirPods (1st & 2nd Gen) and listening to the examples below.

Unprocessed

Processed with NEPTUNE

Key Features

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