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I just bought an Xperia Z2, great phone so far but one huge problem for me. I have a Pulse Elite Headset and I use it with my PS3, my Vita and my laptop, but when I turn them on and try to use the Bass Impact feature with my phone the music stops and don´t recognize them as headphones any more. PLEASE SONY, release an update to fix this, because I find it really offensive that they work with an Iphone or the HTC One, but NOT with your line of smartphones.
Maybe it's because of the support of the Noise Cancelling headsets (which have 4 pins instead of the regular 3). When you turn on the bass impact, it probably detects 4 pins for the NC Headset. Try selecting different accessories in Settings > Sound while connecting your headset. (With and without the feature turned on)