HP C100/110 manual Audio Electrical Specifications, Max Output Level/Impedance, Output Impedance

	System Overview
	System Unit Rear Panel Connectors
	The audio electrical specification for this workstation are summarized in
	Table 1.
Table 1	Audio Electrical Specifications

Frequency Response	25-20,000 Hz
Input Sensitivity/Impedance
Line In	2.0Vpk/47k ohm
Microphone	22mVpk/1k ohm
Max Output Level/Impedance
Line Out	2.8Vpp/47k ohm
Headphone	2.75Vpp/50 ohm
Speaker (internal)	5.88Vpp/48 ohm
Output Impedance
Line Out	619 ohm
Headphone	118 ohm
Signal to Noise*
Line Out	65 dB
Headphone	61 dB
Speaker	63 dB
Line In	61 dB
Microphone	57 dB
THD (w nominal load)
Line Out	-73 dB
Headphone	-70 dB
Speaker	-68 dB
Line In	-75 dB
Microphone	-73 dB

*To convert from dB to number of significant bits, use the formula:

'n=		dB	≈	dB
		-[---20------log---------10------]-		--6----	

For example, for 61dB S/N then n=61/6 or approx. 10 significant bits, or in other words, about 6 bits of noise.

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