I too have a Carbon A - Micro, but to be honest with you I don't think it is worth the £159 I paid for it and so I've ordered a Chord C-USB at £60. I have a QED Reference 0.3m which I found to at least as good as Carbon at a fraction of the cost, but it is simply too stiff to be used the way I want to, plus it does not come in the 1.5m length I need. Chord Cables themselves say they prefer to use a B termination with an adaptor:
We would have liked to have supplied the cable fitted with micro-USB connectors but the challenge of fitting our heavier gauge conductors means that we would be unable to produce a mechanically reliable connection. High performance miniature components have been a real challenge. For the past couple of years we’ve been using our USB cables fitted with USB B to micro-USB adaptors. Adaptors are our least favourite thing and are generally to be avoided whenever possible. In this particular case, it gets interesting. We did some experimentation where we took some of the available micro-USB terminated cables and compared them with our own USB cables used with an adaptor. The limitations placed on conductor gauge by the micro-USB plug severely limit the length and the performance potential of micro-USB terminated cables. We got better results – certainly with the higher end portable devices we tried – by using our own USB cables, along with an adaptor. What this means is, if you have a decent DAC with a micro USB input, don’t be afraid to experiment with adaptors. We got the best performance this way and it’s something well worth trying.
Which cable did you use which was too heavy?