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Product Review

ONIX CD-3 CD Player

Part III

May, 2007

John E. Johnson, Jr.


On the Bench

I used the Philips SACD test disc, which has test tones and sweeps. The same test tones are recorded on a second layer for CD players. The left channel RCA unbalanced output was utilized for measuring the signals. I calibrated the analysis software using a 1 kHz sine wave, recorded at 0 dB on a separate disc, such that the peak registered at 0 dB on the graph. The SMPTE/DIN test signal was at - 9 dB, while the others were at - 3 dB. I recorded results with  the 24/96 upsampling turned off, then with it turned on, to compare the effects of the upsampling.

Using 60 Hz and 7 kHz, IMD came in at less than 0.003%. Notice that the noise floor is lower with upsampling turned on, although there is no effect on the IMD itself.

At 1 kHz, THD+N is less than 0.002%. It is a bit higher with upsampling turned on.

At 10 kHz, on the other hand, upsampling not only lowered the noise floor, it reduced the THD+N.

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