LAB REPORT Denon DCD-2500NE Super Audio CD Player
34 Australian Hi-Fi http://www.avhub.com.au
(0.00031%), but since the level of the fundamental is at
–90dB, the relative level of the second is at –20dB (10%).
Graph 6 shows the same signal, with dither, and you can
see all the harmonic distortion components have vanished
below the noise fl oor at –120dB (0.0001%).
If you’re interested in dither, there’s a good article called
‘The Magic of Dither’ written by Stephen Dawson, at
http://www.tinyurl.com/dither-magic
Intermodulation distortion (IMD) was also excellent,
as you can see from Graphs 7 and 8, where Newport Test
Labs has measured both CCIF twin-tone distortion (Graph
7) and SMPTE IMD (Graph 8). In Graph 7 you can see the
two test signals towards the centre of the graph. The two
closest high-frequency sidebands (at 18kHz and 20kHz) are
well down, at –108dB (0.00039%), while the next are both
more than 130dB down (0.00003%). As for the unwant-
ed difference signal re-generated at 1kHz, it was 122dB
(0.00007%) down, which is excellent. SMPTE results were
also excellent. The thickening around the base of the 7kHz
test signal is some 60Hz components, but they’re all more
than 110dB down (0.00031%).
Frequency response, as with all digital products that
have not had their response deliberately adjusted to deliv-
er specifi c sonic attributes, was ruler fl at below 3kHz, after
which it ‘rolled off’ to be 0.22dB down at 20kHz.-140.000.00 Hz 4000.00 8000.00 12000.00 16000.00 20000.00-120.00-100.00-80.00-60.00-40.00-20.00dBFS0.00 .EWPORT4EST,ABS-140.000.00 Hz 4000.00 8000.00 12000.00 16000.00 20000.00-120.00-100.00-80.00-60.00-40.00-20.00dBFS0.00 .EWPORT4EST,ABS-140.000.00 Hz 9600.00 19200.00 28800.00 38400.00 48000-120.00-100.00-80.00-60.00-40.00-20.00dBFS0.00 .EWPORT4EST,ABS-140.000.00 Hz 9600.00 19200.00 28800.00 38400.00 48k-120.00-100.00-80.00-60.00-40.00-20.00dBFS0.00 .EWPORT 4EST ,ABSGraph 5. THD @ 1kHz
@ –91.24dB recorded
level. (No dither)
[Denon DCD-2500NE
SACD Player]Graph 6. THD @
1kHz @ –90.31dB
recorded level.
(With dither) [Denon
DCD-2500NE SACD
Player]Graph 7. CCIF Dis-
tortion (Twin-Tone
Intermodulation) @
0dB using 19kHz and
20kHz test signals
in 1:1 ratio. [Denon
DCD-2500NE SACD
Player]Graph 8. SMPTE
Distortion (Intermod-
ulation) @ 0dB using
60Hz and 7kHz test
signals in 4:1 ratio.
[Denon DCD-2500NE
SACD Player]