ProAudio Review - October 2008 - (Page 18) STUDIO | A/A Measurements BENCH TEST QUANTIZATION NOISE 44.1 kHz Fs 96.0, 192.0 kHz Fs -116.0 dB -114.4 dB Fs/2 kHz measurement filter 44.1,kHz Fs < 0.0012%, 20 Hz – 20 kHz 96.0 kHz Fs < 0.0012%, 20 Hz – 20 kHz 192.0 kHz Fs < 0.015%, 20 Hz – 20 kHz LINEARITY ERROR 44.1, 96.0, 192.0 kHz Fs < +0.5/-0.5 dB 0 to -120 dBFS 120 dB 20 Hz – 20 kHz PRISM SOUND ORPHEUS FIREWIRE AUDIO INTERFACE INPUT LEVEL FOR 0 dBFS internally Line inputs 6.12 V, 18.0 dBu Mic inputs 1.22 mV, -56.0 dBu OUTPUT LEVELS @ 0 dBFS Line outputs 6.11 V, 17.9 dBu D/D Measurements See commentary for D/D measurements Note: Measurements were made at 44.1,96.0, & 192.0 kHz sample frequencies and with bit depth of 24 bits triangular dithered. Channels 1 & 2 were measured with all unused other channels muted. With all unused channels unmuted, SNR’s were about 5-10 dB worse. Headphone outputs High impedance load 4.66V, 15.6 dBu 50 ohm load 1.13 V, 3.3 dBu, 25.5 mW INPUT IMPEDANCE Line inputs Mic inputs OUTPUT IMPEDANCE Line Outputs Headphone outputs 14.2K 5.2K 51 Ohm 155 Ohm 114.5 dB 115.7 dB 117.6 dB 107.3 dB 110.7 dB 113.0 dB 78.4 dB 112.8 dB 113.0 dB 118.1 dB 114.4 dB 113.0 dB -114.0 dB FREQUENCY RESPONSE 44.1 kHz Fs +0, -3.0 dB 20 Hz – 22.1 kHz 96.0 kHz Fs +0, -3.0 dB 20 Hz – 47.8 kHz 192.0 kHz Fs +0, -3.5 dB 20 Hz – 68.0 kHz TOTAL HARMONIC DISTORTION At 0dBFS signal level 22 kHz measurement filter 44.1, 96.0, 192.0 kHz Fs < 0.0016%, 20 Hz – 20 kHz 80 kHz measurement filter 44.1, 96.0, 192,0 kHz Fs < 0.008%, 20 Hz – 20 kHz LINEARITY ERROR 44.1, 96.0, 192.0 kHz Fs < +0.5/-0.5 dB 0 to -120 dBFS Ch2, Ch2 > Ch 1 > 120 dB 20 Hz – 4.0 kHz 110 dB @ 20.0 kHz 62.0 dB 113.6 dB 116.8 dB 61.0 dB 72.7 dB 75.0 dB 116.8 dB -113.0 dB –111.8 dB Fig. 1 A/A mode frequency response at 44.1, 96.0, & 192.0 kHz Fs. Red = 44.1 kHz, Magenta = 96.0 kHz. Blue = 192.0 kHz. CHANNEL SEPARATION 44.1, 96.0, 192.0 kHz Fs > 124 dB 20 Hz – 20 kHz D/A Measurements FREQUENCY RESPONSE 44.1 kHz Fs +0, - dB 20 Hz – 20.8 kHz 96.0 kHz Fs +0, -3.0 dB 20 Hz – 44.3 kHz 192.0 kHz Fs +0, -3.0 dB 20 Hz – 78.0 kHz TOTAL HARMONIC DISTORTION At 0dBFS signal level 20 kHz measurement filter 44.1, 96.0, 192.0 kHz Fs < 0.001%, 20 Hz – 20 kHz Fs/2 kHz measurement filter 44.1, 95.0, 192.0 kHz Fs < 0.008%, 20 Hz – 20 kHz LINEARITY ERROR 44.1, 96.0, 192.0 kHz Fs < +0.5/-0.5 dB 0 to -120 dBFS < +2.0 dB @ -130 dBFS SIGNAL TO NOISE RATIO 44.1 kHz Wideband 22 kHz BW A weighted 96.0 kHz Fs Wideband 22 kHz BW A weighted 192.0 kHz Fs Wideband 22 kHz BW A weighted DYNAMIC RANGE 44.1 kHz Fs 96.0 kHz Fs 192.0 kHz Fs Fig. 2 A/A mode THD+N at 192.0 kHz sample rate as a function of signal frequency and measurement bandwidth. Red/Blue = Ch 1/Ch2 at 22 kHz measurement BW, Magenta/Cyan = Ch1/Ch2 at 80 kHz measurement BW. 61.0 dB 115.0 dB 116.6 dB 62.3 dB 113.0 dB 115.0 dB 62.3 dB 112.5 dB 115.0 dB 116.0 dB 115.0 dB 114.0 dB A/D Measurements FREQUENCY RESPONSE 44.1 kHz Fs +0, - dB 20 Hz – 22.0 kHz 96.0 kHz Fs +0, -3.0 dB 20 Hz – 48.0 kHz 192.0 kHz Fs +0, -3.0 dB 20 Hz – 79.4 kHz TOTAL HARMONIC DISTORTION At 0dBFS signal level 20 kHz measurement filter 44.1, 96.0, 192.0 kHz Fs < 0.0015%, 20 Hz – 20 kHz Fig. 3 A/A mode typical THD+N as a function of signal level at 192.0 kHz Fs. Both channels measured. Red/Magenta = Ch1/Ch2. 18 | ProAudio Review | October 2008 www.proaudioreview.com http://www.proaudioreview.com
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