Crosstalk Calculator — Channel Separation in dB
Crosstalk occurs when a signal from one channel leaks into an adjacent channel. Enter the intended signal voltage and the measured crosstalk voltage to find the crosstalk in dB and assess channel separation quality.
V
V
Good (consumer audio)
- 1
Voltage ratio
0.001 ÷ 1 = 0.001The fraction of the signal voltage that leaks into the adjacent channel. - 2
Crosstalk
20 × log₁₀(0.001) = -60
How does this calculator work?
Crosstalk (dB) = 20 × log₁₀(Vc/Vs). A result of −60 dB means the leaked signal is 1/1000th of the original — generally inaudible. Channel separation is the positive equivalent. Consumer audio targets −60 to −70 dB; studio equipment −80 dB or better. Enter signal and crosstalk voltages to get the dB value instantly.
Formula
How this is calculated
Crosstalk is the unwanted coupling of a signal from one channel into another — heard in stereo audio as "bleed" from the left channel into the right (or vice versa), or seen in electronics as interference between adjacent PCB traces, cable pairs, or mixer channels. It is expressed in decibels using the standard voltage ratio formula: Crosstalk (dB) = 20 × log₁₀(Vc/Vs), where Vc is the unwanted coupled voltage and Vs is the original signal voltage.
Because Vc is always smaller than Vs in a well-designed system, the result is always negative — for example, a ratio of 1/1000 gives 20 × log₁₀(0.001) = −60 dB. Channel separation is simply the magnitude of that number: 60 dB of separation means the crosstalk signal is 1000× weaker than the intended signal, which is inaudible in almost all listening conditions. Typical performance benchmarks: studio-grade equipment achieves −80 dB or better; consumer stereo equipment typically offers −60 to −70 dB; −40 dB or worse is usually audible as a faint ghost of the other channel.
Measure both voltages at the same reference point and with the same measurement method (peak or RMS). Use an audio analyser, oscilloscope, or a soundcard-based tool. For PCB or cable crosstalk, the induced voltage is often measured at the far end of the victim line with the aggressor driven at full level and the victim terminated in its nominal impedance.
Frequently asked questions
Consumer equipment typically specifies −60 to −70 dB, which is acceptable for home listening. High-end or professional gear aims for −80 dB or better. Crosstalk above −40 dB may be audible — you can hear faint bleed from the other channel during quiet passages.
Capacitive coupling between adjacent conductors (especially in cables, PCB traces, or connector pins), inductive coupling via shared magnetic fields, and resistive coupling through shared ground impedances. Shielded cables, differential signalling, and careful PCB layout all reduce crosstalk.
No — crosstalk is a specific kind of interference that carries a copy of another signal, whereas noise is random. Crosstalk sounds like a faint, correlated ghost of the neighbouring channel; noise sounds like hiss or hum. Both are measured in dB below the nominal signal level, but they have different causes and different mitigation strategies.
Also known as
TG we-Calculate Editorial Team. (2026). Crosstalk Calculator — Channel Separation in dB [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/crosstalk-calculator
TG we-Calculate Editorial Team. "Crosstalk Calculator — Channel Separation in dB." TG we-Calculate. 2026. https://we-calculate.com/calculator/crosstalk-calculator.
TG we-Calculate Editorial Team, "Crosstalk Calculator — Channel Separation in dB," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/crosstalk-calculator
@misc{wecalculate_crosstalk_calculator, title = {Crosstalk Calculator — Channel Separation in dB}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/crosstalk-calculator}}, year = {2026}, note = {TG we-Calculate} }
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