This excellent converter is in good, 'used,' condition as you can see in the pictures. It is fully functional and is fantastic. I have other ways to monitor digital audio in headphones now, so I no longer require this. It would be an excellent addition to a home studio, professional studio or even part of a hi-fi or home cinema - for high quality headphone listening.

This is the first version of the unit, originally launched in 2010. Newer versions are available with slightly higher specifications but this, original version is good enough for just about everything I can think of. Grab yourself a bargain. The box has been lost sometime ago but it will be well packed for shipping. You will notice the miniature rack handles are also missing, sorry. I don't think it makes much of a difference to the sound quality… :-). Replacements are available from Synthax in the UK for £7.99+ delivery, if you really need them.

Here a link to download the manual:

Description and specifications from the RME website:

Highlights

The ADI-2 is equipped with a balanced stereo line input via two Neutrik XLR/phones combo jacks, a balanced stereo line output with XLR plus separate and simultaneously active phone jacks, as well as an adjustable headphone output.

The analog inputs and outputs use the same circuit design as RME's famous ADI-8 DS, guaranteeing outstandingly low noise and distortion. Three different settings for the input and output levels each provide perfect compatibility on analog domain. A further highlight is SteadyClock(TM), a proprietary clock technology for maximum jitter suppression. SteadyClock guarantees superb sound quality completely independent from the quality of the current reference clock. The ADI-2 uses the latest generation of AD/DA-converters capable of up to 192 kHz sampling frequency at S/N ratios up to 119 dBA.

But the ADI-2 has more to offer than tremendous sound, it also gives you exciting digital connectivity. Its transformer-balanced coaxial (RCA) SPDIF I/O has switchable Channel Status to make it fully AES/EBU compatible. The optical TOSLINK I/Os can handle up to 192 kHz and also serve as ADAT I/O with up to 96 kHz sample rate. You can even use SPDIF input and ADAT output or vice versa in AD/DA mode.

The clear layout and the distinct labelling of the front panel with its functional buttons, the informative status displays, a 6 LED level meter as well as the tidy functional back panel make it easy to operate.

Power to this unit!

Following the 'Universal Power Supply' philosophy of RME's Digiface, Multiface, QuadMic and OctaMic, the ADI-2 comes with an external switching power supply. The unit's additional internal switching power supply has been specially designed and optimised for audio applications. It accepts any voltage from 7 to 30 V, be it AC or DC, and even runs on batteries and rechargeable batteries.

Specifications:

• Input AD: 1/4" TRS jack and XLR via Neutrik combo jacks, servo-balanced, completely symmetrical, DC-coupled signal path
• Output AD: ADAT optical or SPDIF optical, SPDIF coaxial, AES/EBU compatible
• Input DA: ADAT optical or SPDIF optical, SPDIF coaxial, AES/EBU compatible
• Output DA: 1/4" TRS jack and XLR, servo-balanced, DC-coupled signal path
• Dynamic range AD: 110 dB RMS unweighted, 113 dBA
• THD AD: < -110 dB (< 0.00032%)
• THD+N AD: < -104 dB (< 0.00063%)
• Crosstalk AD: > 110 dB
• Dynamic range DA: 116 dB RMS unweighted, 119 dBA (unmuted)
• THD DA: < -103 dB (< 0.0007 %)
• THD+N DA: < -100 dB (< 0.001 %)
• Crosstalk DA: > 110 dB
• Input/Output level, 0 dBFS @ Hi Gain: +19 dBu
• Input/Output level, 0 dBFS @ +4 dBu: +13 dBu
• Input/Output level, 0 dBFS @ -10 dBV: +2 dBV
• Sample rate internally: 32, 44.1, 48, 64, 88.2 kHz, 96 kHz, 128, 176.4, 192 kHz
• Sample rate externally: 28 kHz - 200 kHz
• Frequency response AD/DA, -0.1 dB: 5 Hz - 21.5 kHz (sf 48 kHz)
• Frequency response AD/DA, -0.5 dB: < 5 Hz - 43.5 kHz (sf 96 kHz)
• Frequency response AD/DA, -1 dB: < 5 Hz - 70 kHz (sf 192 kHz)
• Accepted power supply voltage DC 8 V - 28 V, AC 8 V - 20
• Dimensions 215 x 44 x 130 mm