I got these especially for listening wireless to podcasts & MP3 files in bed without the bother of unplugging my laptop and balancing it on my knees. They are perfect for the purpose, and I can walk around my small apartment without missing a word. The procedure to pair them with the laptop or phone took me a while to get correct, but that's mostly because I've never had a compatible Bluetooth device before. I was able to connect the phones simultaneously to my laptop and my phone. The sound is warm and full-ranged, a little bass-heavy. The low bass is very powerful, performing below the rated 20 Hz bottom; organ music goes down to 16 Hz, and these phones delivered, rattling my teeth and even vibrating my chest a little! The treble is adequate; I wasn't able to fully test it, as my laptop has limitations. In Bluetooth mode, my equalizer is bypassed, so I haven't tested wireless frequency range. However, the wireless sound is rich and clear with speech, which was the purpose for which I bought the phones. Music of various genres sounds great, especially wired where I can tweak the equalizer profile. The attached image is the manufacturer's frequency response graph from the manual. It shows the bass emphasis I've mentioned. I am concerned by the >10dB peak around 7-8 kHz. I suffered significant hearing loss in 8 hours with a previous set of phones (Sennheiser), that had a similar peak, paired with a treble-heavy keyboard. As with any headphones, listen at moderate levels! The phones feel sturdy, with studio style swivelling ear pieces. They are surprisingly light and comfortable; I have worn them for almost 24 hours with only short breaks, for days in a row, and they are so unnoticeable that I have actually walked out of my apartment without realizing I was still wearing them! I have even slept in them. The ear pads are very soft, and provide adequate external noise reduction (but not cancellation). Overall, I am more than satisfied, in fact very pleased with the A70. I am not a sound professional, but I would say they compare very favourably with phones costing two or three times as much.
