Selling since it is not compatible with recent Apple Software changes.
All I own is a MacBook pro...
Works fine with Windows machines, see website for compatibility.
Has the clock upgrades and shortblock isolator
https://www.empiricalaudio.com/products/short-block
Low-jitter USB digital audio converter This is the simplest way to play audio through your existing DAC using a computer. It can replace your CD transport, and deliver better sound quality. The Off-Ramp 5 is a fifth-generation product that provides a USB computer interface to your audio system with unprecedented sound quality. The Off-Ramp 5 supports sample-rates of up to 24/192 and uses Asynchronous USB protocol*, which is optimum for reducing jitter. A custom Software Driver is provided and must be loaded for the Mac or PC. This driver has been shown to be more reliable and trouble-free than the native Microsoft driver. The Off-Ramp 5 includes an HDMI I2S output, so that DACs with these inputs including PWD and W4S can be driven directly, avoiding S/PDIF conversions (Note: The Off-Ramp 5 works with the PWD HDMI I2S in Native Mode only. This utilizes the clock of the OR5. The other modes do not.) It also has sample-rate LEDs that indicate the sample-rate of the track that is being played by the computer. No sample-rate changes take place in the Off-Ramp 5. The data is not modified. It is bit-perfect playback. The Off-Ramp 5 voltage regulators now include a main Hynes regulator and USB Hynes regulator. Optional Hynes regulators can be added for S/PDIF and HDMI if the customer desires these outputs to be further improved. The Off-Ramp 5 allows you to add a high-performance USB interface to your existing non-USB DAC. It can also improve the existing computer interface on your USB or Firewire DAC. Most DACs with computer interfaces will sound better when an Off-Ramp 5 is used to drive their S/PDIF, AES/EBU or HDMI I2S input. The Short Block is a USB cable filter that plugs in-line with the USB cable from your computer to your USB interface (either a USB converter or USB DAC). The Short Block is usually plugged into the USB DAC or USB converter and then the USB cable plugged into it. The purpose of the Short-Block is to improve audio quality by reducing jitter caused by common-mode noise on the USB cable. Common-mode noise is voltage that develops on both of the differential signal lines in the USB cable. Ideally, this voltage would never be present or be fully rejected by the receiver USB interface, but in real systems with multiple grounds and imperfect USB drivers and receivers the noise is usually present and impacts audio quality. The Short Block reduces this common-mode noise, primarily at high-frequencies.
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