sampling clock. Continue reading this section for more information on making selections in the Audiophile USB Control Panel.

Active Channels & Sample Depth: Activation of the Analog and S/PDIF inputs and outputs is done with a set of four check boxes.Two radio buttons allow selection between sample bit depths of 16-bit or 24-bit. These settings will interact with each other, either expanding or limiting your Active Ports, Sample Depth, and/or Maximum Sample Rate settings. Using the full USB bandwidth will allow for 4x4 audio streams at 16 bits with a sampling rate of 48kHz or below.A higher bit depth or sampling rate will demand a trade-off from your system, which can be achieved by disabling your Active Ports.

On the right side of the control panel there are two columns labeled “Active Channels” (Analog and S/PDIF inputs and outputs) and “Sample Depth” (16-bit and 24-bit). Choosing the 24-bit setting will allow your music program to record at any bit depth up to 24-bit, depending on the variety of selections within that program.

With any combination of three stereo pair “Active Ports” enabled, the Audiophile USB is capable of 48kHz or 44.1kHz (or lower) sampling rates at either 24- or 16-bits.When you uncheck and deactivate any one of the Active Ports, the 24-bit option will become available. If you select the 24-bit radio button, and then activate all four Active Ports, the control panel will automatically switch back to the 16-bit setting and gray out the 24-bit option.

NOTE: Please exit any audio applications running before switching between bit depths.

The Audiophile USB will perform at 96kHz sampling rate with any one of the stereo pairs enabled, and with the 24-bit Sample Depth selected. This is most useful if your CD/DVD player is capable of playing “audiophile” 96kHz recordings.The Audiophile USB will not operate at 96kHz when the control panel is set to 16-bits. In the example below, Output 1&2 is enabled and 24-bit Sample Depth is selected, with the Maximum sample rate showing 96kHz.

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M-Audio AP-012403 owner manual
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AP-012403 specifications

The M-Audio AP-012403 is a versatile and high-quality audio interface designed for musicians, producers, and podcasters. This device stands out with its user-friendly features, impressive sound quality, and robust build that make it a staple in both home studios and professional setups.

One of the main features of the M-Audio AP-012403 is its dual-input capability. It allows users to connect microphones, instruments, or other audio sources simultaneously, making it ideal for recording bands, duos, or solo artists who wish to layer their sounds. The interface is equipped with high-quality preamps that deliver exceptional sound clarity and warmth, ensuring that every nuance of the performance is captured accurately.

In addition to its input versatility, the device supports high-resolution audio recording up to 24-bit/192 kHz. This means that the M-Audio AP-012403 is capable of capturing audio with remarkable detail, making it suitable for both studio recordings and live performances. Musicians can confidently record their vocals and instruments without worrying about losing quality in the process.

Another key feature is the low-latency monitoring, which allows users to hear their inputs in real-time without the delay that can be distracting during recording sessions. This feature is particularly crucial for vocalists and musicians who rely on accurate timing and pitch when laying down tracks.

The M-Audio AP-012403 also incorporates MIDI connectivity, offering musicians the ability to connect keyboards, controllers, or synths directly to their system. This makes it a great addition for those who work extensively with MIDI instruments as part of their music production process.

Furthermore, the interface comes with a robust software bundle, including digital audio workstations (DAWs) and various virtual instruments and effects. This provides users with everything they need to start producing music right out of the box.

The design of the M-Audio AP-012403 is both sleek and durable, featuring a compact footprint that makes it portable and easy to incorporate into any setup. Additionally, the intuitive plug-and-play functionality ensures that users can get started with minimal hassle.

Overall, the M-Audio AP-012403 combines excellent audio performance with practical features and flexible connectivity options, making it an attractive choice for musicians and content creators looking to elevate their audio production capabilities.
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