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Measurements & Analysis
Frequency Response & Distortion
I measured a ruler flat frequency response
with a -3dB point around 200kHz in all
2CH stereo modes (ie. Pure direct, Stereo
direct). The AVR-5308CI measured similar
bandwidth as well.
With 200mVin, I set the master volume
until I reached 1Vrms out of the preamp.
The FFT plot was so clean that I couldn’t
measure any appreciable distortion products
until I ramped up the signal level to drive
the output to nearly 6Vrms. At that point,
Imeasured(15.268+80.424)dBv=95.69dB
or 100*alog^-1(-95.69/20) = .0002%THD
+ N which is among the lowest distortion
I’ve ever measured in a preamp regardless
of price. The AVR-5308CI didn’t compete
here as the measurable harmonics were
about 6dB worse driving an output of
1Vrms than they were on the AVP-A1HDCI
outputting nearly 6Vrms.
I measured about 15.5dB of gain via the
balanced and unbalanced outputs of the
AVP-A1HDCI preamp (with source level
set to 0dB on the particular input and
channel trims set to 0dB). The preamp has
Denon AVP-A1HDCI Preamp FFT Distortion Analysis
Denon AVP-A1HDCI Preamp Frequency Response
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