Trend DV-821A
This is a review and measurements of a cheap DVD player, Trend DV-821A. It costed about $35 in 2009. It plays DVD/MP4/SVCD/VCD/CD/HD-CD/WMA/MP3/JPEG files.
Parameters as per user manual:
Frequency response … 20Hz – 20kHz / +/-1dB / Fs = 192kHz
Audio S/N … >= 90dB
Dynamic range … >= 90dB
Distortion … <0.01%
DAC … 192kHz/24bit
Audio output … 2.0V
So I started with my usual set of measurements
THD at 1kHz and 0dBFS
THD is about 0.03% and SINAD (A weighted) is 69.6dB. THD gets a bit better for lower amplitude, THD at -3dBFS is 0.02%. Noise floor is quite clean, “digital rubbish” starts above 10kHz. See noise shaping above 24kHz. Output voltage is 2.11V.
THD at 1kHz and -60dBFS
Quite clean plot with higher noise level, noise shaping above 24kHz.
THD at 5kHz and 0dBFS
Distortion keeps same value as for 1kHz.
THD at 5kHz and -60dBFS
Nice clean plot in audio band, higher noise.
CCIF IMD 19+20kHz
H2 difference tone is about 70dB below fundamental, H3 skirts only about 60dB below fundamental. HF linearity is quite poor and we can also see 1 mirror image near Fs/2.
Digital zero
Not so bad and referred to full output noise is about -96dB(A).
Multitone
Dynamic range is about 85dB.
HF noise spectrum to 10MHz
This is bad. We can see usual 60kHz line + its multiples, probably from SMPS power supply. We can also see 4 high peaks above 1MHz. This may make troubles to following amplifier or preamplifier.
HF noise in time domain
Same shown in time domain, sharp edges of spikes indicate to very high frequencies in output spectrum.
Conclusion
The results are not that bad taking into account the cost $35 and age of the unit (10 years). I appreciate clean noise floor and absence of digital rubbish in the audio band, both better than for Technics SL-PG100 and ONKYO DV-SP503E that I tested here. I would be careful because of not very nice HF spectrum at the output, proper LPF filtering should be present at the input of the following component of the audio chain. The sound is acceptable.
This is a review and measurements of a cheap DVD player, Trend DV-821A. It costed about $35 in 2009. It plays DVD/MP4/SVCD/VCD/CD/HD-CD/WMA/MP3/JPEG files.
Parameters as per user manual:
Frequency response … 20Hz – 20kHz / +/-1dB / Fs = 192kHz
Audio S/N … >= 90dB
Dynamic range … >= 90dB
Distortion … <0.01%
DAC … 192kHz/24bit
Audio output … 2.0V
So I started with my usual set of measurements
THD at 1kHz and 0dBFS
THD is about 0.03% and SINAD (A weighted) is 69.6dB. THD gets a bit better for lower amplitude, THD at -3dBFS is 0.02%. Noise floor is quite clean, “digital rubbish” starts above 10kHz. See noise shaping above 24kHz. Output voltage is 2.11V.
THD at 1kHz and -60dBFS
Quite clean plot with higher noise level, noise shaping above 24kHz.
THD at 5kHz and 0dBFS
Distortion keeps same value as for 1kHz.
THD at 5kHz and -60dBFS
Nice clean plot in audio band, higher noise.
CCIF IMD 19+20kHz
H2 difference tone is about 70dB below fundamental, H3 skirts only about 60dB below fundamental. HF linearity is quite poor and we can also see 1 mirror image near Fs/2.
Digital zero
Not so bad and referred to full output noise is about -96dB(A).
Multitone
Dynamic range is about 85dB.
HF noise spectrum to 10MHz
This is bad. We can see usual 60kHz line + its multiples, probably from SMPS power supply. We can also see 4 high peaks above 1MHz. This may make troubles to following amplifier or preamplifier.
HF noise in time domain
Same shown in time domain, sharp edges of spikes indicate to very high frequencies in output spectrum.
Conclusion
The results are not that bad taking into account the cost $35 and age of the unit (10 years). I appreciate clean noise floor and absence of digital rubbish in the audio band, both better than for Technics SL-PG100 and ONKYO DV-SP503E that I tested here. I would be careful because of not very nice HF spectrum at the output, proper LPF filtering should be present at the input of the following component of the audio chain. The sound is acceptable.