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Yes, Bluetooth encoding comes with an inherent audio delay, the exact amount of which will depend on the codec used. A codec can only be used if both the transmitter and the headphones support it. This transmitter supports the SBC codec, which is standard Bluetooth stereo audio, the Qualcomm aptX codec, and the Qualcomm aptX Low Latency codec. If your headphones support aptX Low Latency, the transmitter will use that codec. If they do not, it will try regular aptX and if that's not supported, it will default back to SBC. The approximately audio latency (delay) you can expect is 30-40 milliseconds with aptX Low Latency, 130-170ms with aptX, and over 200ms with SBC. For watching TV, the threshold is approximately 70ms - below that you won't notice a latency. However, for live drumming I suspect that it is significantly lower, so even aptX Low Latency may not be sufficient. Still, if you end up trying this device, please make sure you are using aptX Low Latency-compatible headphones for the best chance at a reasonable latency performance.
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