T+A Elektroakustik DAC 8 DSD Betriebsanleitung Seite 61

Oversampling 4 (pure Bezier interpolator)
This process delivers a perfect reconstruction of the original music
signal. It exhibits no pre- or post-echoes of any kind, and does not add
coloration or timing errors to the original signal. In sonic terms this
method offers an impressive blend of naturalness, good dynamics and
accuracy.
Frequency response and transient characteristics of the Bezier
interpolator
Frequency bandwidth of the analogue reconstruction filter
"CLEAN"-Mode up to 60 kHz and "WIDE"-Mode up to 120 kHz
The "WIDE" setting produces the best sound quality, but only with
high-quality amplifiers which are able to process signal frequencies up
to 300 kHz without generating distortion.
If you are in any doubt about the ability of your amplifier to deal with
very high signal frequencies up to 300 kHz, please check this with the
manufacturer of your equipment.
Alternatively you can set the switch to the "WIDE" setting, and simply
listen to the results. If you hear no interference, and if the sound image
is better than that in the "CLEAN" setting, leave in the "WIDE" mode.
Frequency bandwidth of the two settings

The "WIDE" setting can be used without restriction with all 
amplifiers.
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