This answer applies to R2 Mk3 R4 Mk3 MR1 Mk1 MR1 Mk2 R5 Mk1 R7 Mk1 / Mk2 R7 Mk3
aptX technology provides sound quality equal to that of CD when streaming music by Bluetooth. You do not need to have an aptX enabled device to use R4’s Bluetooth capability; however, if your device does support aptX, you will notice an improvement in audio clarity when streaming over Bluetooth. An increasing number of devices are now available with aptX®, but with or without, sound quality over Bluetooth with R4 is impressive.
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