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I'm going to buy a low-latency bluetooth module that functions both as a tramsmitter as both receiver. Should I get just one to connect to my audio interface or do I also need one for my headphones if I want to minimize latency?

The afformentioned module used aptX technology, making it much faster than standard bluetooth (which my headphones use).

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    \$\begingroup\$ if the module has lower latency than your headphones, then use the module, otherwise use the headphones without the module ... you are asking a technical question about unknown devices \$\endgroup\$ – jsotola Aug 16 '20 at 17:54
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To begin, aptX is an algorithm that is used to compress-decompress sounds on the fly; this is often called codecs [short for coder-decoder]. It is similar mp3, mp4, and wav algorithms but these are intended to be embedded in the hardware itself. Therefore, one can conclude that there could be less delay in some codecs, but it is not really detectable by humans. However, the quality of the sound might be more noticeable than the delay.

At the end, aptX or no aptX you are still using Bluetooth. And yes, aptX might improve your audio a few percentage points but the aptX might just be marketing propaganda.

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