Aux latency is the delay a speaker adds when playing over its wired 3.5mm input instead of Bluetooth. An analog cable should be instant, and on some speakers it is: 33 ranked speakers publish a figure, and it runs from 0 to 295 ms.
A wire carrying an electrical signal doesn’t need to buffer or decode anything, so 0ms is what a purely analog path should measure. Anything higher means the signal is being digitized somewhere before it reaches the drivers.
Why Would A Wired Connection Have Any Delay At All?
Once a speaker has a DSP for EQ, a limiter, or bass processing, the simplest way to apply that processing to every input, aux included, is to convert the analog signal to digital, process it, and convert it back. That round trip costs time, and it’s why a speaker with genuinely zero-latency aux, like several Minirig models here at 0ms, is telling you something real about its signal path.
This is unrelated to Bluetooth latency. A speaker can be excellent on one and poor on the other; the EarFun UBoom L is 400ms over Bluetooth in its normal mode but a measured 216ms even over aux, so plugging in a cable doesn’t automatically fix a laggy speaker.
Does Aux Latency Actually Matter?
For music, no. A fixed delay under the audio doesn’t affect anything you’d notice. It matters for the same cases Bluetooth latency does: watching video (delay above roughly 150ms puts lip-sync visibly out), gaming, or playing an instrument through the speaker, where even 100ms of hidden lag on a “should be instant” wired connection can be confusing to troubleshoot.
Frequently Asked Questions
What is aux latency on a Bluetooth speaker? It’s the delay a speaker adds when playing over its wired 3.5mm aux input instead of Bluetooth. A purely analog signal path should measure close to 0ms.
Why would a wired aux connection have any latency at all? If the speaker applies DSP processing such as EQ or a limiter to the aux input, it has to convert the analog signal to digital and back, which adds a measurable delay even over a wire.
Is aux latency the same as Bluetooth latency? No, and a speaker’s figures for each don’t predict one another. Some speakers measure well on one and poorly on the other.
How much does aux latency vary between speakers? Of the 33 ranked speakers publishing a figure, it ranges from 0 to 295 ms, with several speakers measuring a genuine 0ms and a few over 200ms.
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