Overview

The Steinberg UR-RT4 is a 6-input, 4-output USB 2.0 audio interface featuring four Rupert Neve Designs transformers. Combined with Yamaha’s D-PRE preamps, it supports 24-bit/192kHz with external power for stable operation. It includes zero-latency monitoring and Cubase AI software bundle, providing essential recording setup elements.

Scientific Validity

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Basic measurements are good, with AK5359 ADC achieving 102dB S/N ratio and THD+N around 0.0008%, offering near-transparent resolution. D-PRE preamps provide low-noise amplification with frequency response within 20Hz-20kHz ±0.5dB. However, Rupert Neve transformers add intentional harmonic distortion (2nd/3rd harmonics) for character change, not fidelity. Measured audible improvements are limited, with reviews noting undetectable on/off differences in ABX-like tests. Per criteria, S/N below 105dB warrants intermediate score.

Technology Level

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Yamaha’s D-PRE preamps feature highly regarded low-noise design, and Rupert Neve collaboration transformers show advanced analog circuitry. SSP2 DSP enables stable zero-latency monitoring, with AK5359 ADC and USB 2.0 implementation at high completion levels. The 6-input setup differentiates, though transformer direction is debatable.

Cost-Performance

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At 649 USD, compared to equivalent 6-input performance (S/N over 100dB, THD+N under 0.001%) in Native Instruments Komplete Audio 6 MkII at 179 USD, CP value is 179÷649=0.28 (rounded to 0.3). MOTU M6 (399 USD) also matches. High cost from transformers lacks verified benefits, with alternatives achieving same quality cheaper.

Reliability & Support

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Steinberg maintains established audio industry presence with stable drivers and updates. External power ensures reliability for long-term use. Some DSP limitations noted, but warranty and support meet standards.

Rationality of Design Philosophy

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D-PRE adoption and zero-latency monitoring are practical, but transformer distortion addition lacks scientific basis for transparent interfaces, driving up cost. Emphasizing analog over digital transparency is not contemporary, with limited rationale given alternatives.

Advice

Consider UR-RT4 only if transformer changes are verifiably needed. Equivalent performance is available cheaper via Native Instruments Komplete Audio 6 MkII (179 USD) or MOTU M6 (399 USD), with no practical drawbacks. 649 USD justifies only with confirmed scientific effects. For most, undetectable differences make software-processed transparent recording more rational. Prioritize measurements for alternatives.

(2025.8.5)