Da Impulse Responses - RME Audio ADI-2 Pro User Manual

34.9 DA Impulse Responses

Short delay Sharp
Short Delay Slow
The screenshots above show the analog output signal of the various filter settings available for
the DAC, stimulated by a digital single sample impulse at 44.1 kHz sample rate. While Slow has
the most perfect response, it looses around 1.2 dB already at 15 kHz, see chapter 34.8.
The DAC includes another filter which is called Super Slow in its data sheet. The impulse re-
sponse looks perfect, but checking the output signal with an Oscilloscope reveals steps that are
more typical for so called Non-OverSampling (NOS) devices, so we renamed it NOS within the
DAC filter menu. Note that there is no audible distortion, the steps equal high frequency har-
monics that are mostly higher than 20 kHz. Please also note that Slow and NOS filters cause
much more aliasing into the audio band and out-of-band noise than Sharp filters.
Sharp
Slow
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