Q Acoustics M40 HD: Two minute review. Understandably emboldened by the success of its wireless-system-in-a-pair-of-speakers M20 HD, Q Acoustics is back with a bigger, floorstanding version.

The loudspeaker supports aptX HD, aptX LL, aptX, AAC, and SBC and Bluetooth 5.2. The HD5 upsamples everything to 24-bit/48kHz PCM. There is no support for DSD or MQA. The rear panel features a stereo ...