As the title says. Soundcheck was good about aptX. Unfortunately, there was only connect via a cheap Bluetooth dongle with CSR Harmony on aptX. My Sennheiser BTD 500 USB is not the receiver. (But the BT-500 comes easily with my Sony BM-10 per aptX ...) An inquiry to the Advance Acoustic Support provides: ---------- We had several times this matter, and we did several tests, WTX1000 is working well with all aptX Bluetooth dongle except with Sennheiser (BTD500 USB) dongle aptX and Creative Labs, and we do not understand why. ---------- Because of cheap USB dongle but compatibility issues with the Bluetooth stack on my Windows laptop has 8 and the Sennheiser runs but there must of WTX-1000 unfortunately soft again :(