Since the Steam Beta/Firmware update fixed the "No Bass"-Issue for me, i can confirm that the issue really is only a software-related problem. So for those of us where the Update did´nt work, there should be a solution soon. My Headphones are also more then loud enough when turning the volume all up, even that i set the "Bass Boost"-Option to +6db. Also make sure that you choose "Vive Pro Multimedia Audio" as Output in the Steam VR-Settings, before i had something with "Vive Pro Nvidia..." which had less bass and much less volume. With all that settings, i have clear, rich and detailed sound now with nice low frequencies and enough volume. One issue i have left is that the earphones provide to little pressure on my ears so that the power of the sound is unfortunately less rich as it could be. I fixed this by using a wide rubber band around the Vive which works perfect, but is of course just a "quick and dirty"-fix. As i read many people also complaining about that, so my only requirement would be any HTC-Hardware-upgrade for that like tougher springs for the headphones or whatever. Apart from that, i´m really happy with the Pro now.
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One reason that pushed me towards upgrading from Vive to Vive Pro for 869 € (that´s how much it costs here) was that i didn´t want the fiddlyness anymore to put on my Bluetooth-Headset over the vive after i put on the vive - and vice versa. So i was excited about the included headphones. Unfortunately i also get this horrible sound without any bass. I seriously hope it´s fixable by software as HTC mentioned, if not i expect them to offer a replacement for the headphons with at least moderate soundquality. Sorry, but the pricepoint of the Vive Pro is way to high to come with crappy headphones.
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