9.11 What are the specs of the audio hardware on the 700 series?

This is a summary of the audio features supported by the models 715, 725, 735,
and 755 workstations.  The 705 and 710 also have audio, but the specs are
not available. The 720, 730, and 750 models DO NOT have audio.

Audio features  Programmable sample rates (kHz): 8, 11.025, 16,
                    22.05,32, 44.1, 48
                Programmable output attenuation: 0 to -96 dB in 1.5 dB steps
                Programmable input gain: 0 to 22.5 dB in 1.5 dB steps
                Input monitoring
                Coding formats: 16-bit linear, 8-bit mulaw, or A-law

Audio inputs        Line in
(not on all models) Mono microphone with 1.5V phantom power

(Editorial comment - a Sun microphone appears to work just fine.)

Audio outputs       Line out
(not on all models)     Headphone
                    Mono speaker jacks
                    Built-in mono speaker

Audio CODEC         Crystal CS4215

Typical specifications measured on a stock 715.  Values will differ only
slightly on other models.

Frequency response      25 - 20,000 Hz

Input Sensitivity/Impedance
            Line In         2.0 V(pk) / 47 kohms
            Microphone  22 mV(pk) / 1 kohm

Output Impedance (nominal)
            Line out    619 ohms
            Headphone   118 ohms
            Speaker (ext)  11 ohms

Max Output Level/Impedance
            Line Out    2.8 V (p-p) / 47 kohms
                        Headphone   2.75 V (p-p) / 50 ohms
                        Speaker (ext)  5.88 V (p-p) / 48 ohms

Signal to Noise
            Line In     61 dB
            Line Out    65 dB
            Microphone  57 dB
            Headphone   61 dB
            Speaker (ext)  63 dB

THD (at nominal load)
            Line In     -75 dB
            Line Out    -73 dB
            Microphone  -73 dB
            Headphone   -70 dB
            Speaker (ext)   -68 dB

(Thanks to Rocky Craig, HP)