Headphone Output SNR
Headphone output signal-to-noise ratio compares a specified audio level with background noise, expressed as a positive decibel figure.
A larger comparable ratio means less noise relative to the reference signal. The reference level, connected load and noise weighting affect the result. A high ratio measured at a high output level does not by itself establish inaudible hiss with sensitive earphones.
Headphone Output SNR — Headphone Amp
The headphone amplifier's SNR concerns its headphone output, which may have different results for balanced and single-ended connections. Gain, tube operation or feedback settings can change the measurement. It helps assess background noise, but only in relation to the signal level used as its reference.
Compare the same output, reference level, load and weighting, including A-weighted versus unweighted results. Preserve 'greater than' limits. A DAC chip's specification or the unit's line-output SNR cannot replace the headphone measurement. A figure explicitly labelled dynamic range uses a different test basis, while a residual noise voltage is not a signal-to-noise ratio.
Headphone Output SNR — Digital Audio Player
A player's headphone SNR includes the performance of the output path feeding your headphones. Balanced and single-ended sockets may have separate figures, and the supplied amplifier module matters on a modular player. A strong number does not guarantee silence with very sensitive in-ear monitors at low listening levels.
Compare the same output, gain, operating mode, weighting and reference conditions. Check any separate 2.5 mm and 4.4 mm results rather than assuming both balanced sockets match. A line-output or converter-chip figure describes another part of the product. Keep a result labelled dynamic range identified as such instead of treating its measurement as ordinary SNR.