RME / ADI-2 FS AD/DA converter

This 2-channel high-end AD/DA converter from RME can output in a variety of formats, including SPDIF, AES/EBU, and ADAT.

■AD/DA Converter
The ADI-2 FS is a precision, compact, two-channel high-end AD/DA converter. It provides high-performance AD/DA conversion up to 192 kHz for SPDIF, AES, and ADAT. The analog inputs utilize the advanced circuit design of the acclaimed ADI-2 Pro, achieving exceptionally low noise, distortion, and frequency response. Furthermore, it features the latest RME clock technology, ""SteadyClock FS,"" which suppresses jitter with femtosecond accuracy, ensuring superior sound quality regardless of the reference clock quality. The ADI-2 FS also inherits the conversion technology from the ADI-2 Pro. The AK557x and AK4490 chips provide a 192 kHz sampling frequency, low distortion, and a dynamic range of 120 dBA.

When the input selection is set to DIG (digital), the device functions as a digital format converter with monitoring capabilities. The AD converter is disabled, and the DA converter is used for monitoring the digital input signal, rear output, and headphone output. Conversion between SPDIF coaxial (or AES) and all formats, including professional and consumer-grade ADAT, is possible. The ""Analog Bypass"" function connects the analog output circuit directly to the analog input circuit, allowing the ADI-2 FS to be used as an analog preamplifier. It can also be used as a balanced to unbalanced converter.

The ADI-2 FS features a powerful headphone output that exceeds the proven high-power headphone output found in many RME interfaces. With 0.45W per channel, 0.1 Ω output impedance, a maximum output level of +19dBu, and extremely low THD, the new-generation high-power circuitry ensures optimal performance with most headphones, including IEMs (in-ear monitors). A relay allows click-free on/off switching.

Power is provided via the included external switching power supply, making it ideal for development and measurement applications requiring galvanic isolation.

Technical Specifications
AD
o Signal-to-Noise Ratio @ +19 dBu: 117 dB RMS unweighted, 121 dBA
o Frequency Response @ 44.1 kHz, -0.1 dB: 5 Hz to 20.5 kHz
o Frequency Response @ 96 kHz, -0.5 dB: 3 Hz to 45.5 kHz
o Frequency Response @ 192 kHz, -1 dB: 2 Hz to 92.7 kHz
o THD @ -1 dBFS: -114 dB, 0.00015%
o THD+N @ -1 dBFS: -112 dB, 0.00025%
o Channel Separation: > 110 dB
o AD Maximum Input Level: +19 dBu
o Input: XLR or 1/4"" TRS balanced
o Input Impedance: Balanced: 36 kΩ, Unbalanced: 18 kΩ
o Input Sensitivity Switch: +4 dBu, +13 dBu, +19 dBu @ 0 dBFS
DA
o Signal-to-Noise Ratio: 117 dB RMS unweighted, 120 dBA
o Frequency Response @ 44.1 kHz, -0.1 dB: 10 Hz to 20.2 kHz
o Frequency Response @ 96 kHz, -0.5 dB: 5 Hz to 44.9 kHz
o Frequency Response @ 192 kHz, -1 dB: 3 Hz to 88 kHz
o THD @ -1 dBFS: -112 dB, 0.00025%
o THD+N @ -1 dBFS: -110 dB, 0.00032%
o THD @ -3 dBFS: -116 dB, 0.00016%
o Channel Separation: > 110 dB
o Maximum output level: +19 dBu
o Output: XLR or 1/4"" TRS balanced
o Output impedance: XLR balanced 150 Ω, TS unbalanced 100 Ω
o Input sensitivity switch: +4 dBu, +13 dBu, +19 dBu @ 0 dBFS
DA - Stereo monitor output (Phones)
Shared with DA. The only differences are as follows:
o Output: 6.3 mm stereo TRS, unbalanced
o Output impedance: 0.1 Ω
o Output level @ 0 dBFS, load 100 Ω or more: +19 dBu (6.9 Vrms)
o Maximum power 32 Ω load: 0.7 W per channel (0.01% THD, +16 dBu, 4.9 Vrms)
o THD 32 Ω load @ +15 dBu: -110 dB, 0.0003%
Mode ANA (Analog Input to Analog Output)
o Signal-to-Noise Ratio @ +19 dBu: 123 dB RMS unweighted, 126 dBA
o Signal-to-Noise Ratio @ +13 dBu: 119 dB RMS unweighted, 122 dBA
o Signal-to-Noise Ratio @ +4 dBu: 112 dB RMS unweighted, 115 dBA
o Frequency response -0.5 dB: 1 Hz to 120 kHz
o THD+N @ +19 dBu: -116 dB, 0.00016%
o Channel Separation: > 120 dB
o Maximum Input/Output Level: +22 dBu
Digital
o Clock: Internal, ADAT Input, SPDIF Input
o External Clock Jitter Suppression: > 50 dB (2.4 kHz)
o Clock Jitter During AD/DA Conversion: Near-Zero
o PLL Ensures Zero Dropouts Even with Jitter of 100 ns or More
o Bitclock PLL: Trouble-Free Operation Even with Variable Speed (Varispeed) ADAT
o External Clock (SPDIF) Supported Sample Rates: 28 kHz to 200 kHz
o External Clock (ADAT) Supported Sample Rates: 40 kHz to 49 kHz
o Internal clock: 32, 44.1, 48, 64, 88.2, 96, 176, 188, 192 kHz