As you may be able to tell I'm unashamed of how strange I look with them on. It has certainly added some bulk to my rather thin head.
I'd like to share all opinions on how to make the Sigmas shine . Knowledge of how many owners there are left around the world , whether this is your main phone or once was but you have moved on and if so why. Have there been meets where people have seen several displayed if so what was being used to drive them and to what effect?
What do you think the specific sound signature of each of the models are and should you love them for it or tame their excesses?
I have already noticed something quite startling compared to the rest of my collection; the difference a source and amp/energiser makes to my Sigma Pros. I have no external DAC I sold 4 recently. I have modified my Stax 252S to run on a battery pack and tried this hooked up to a standard Panasonic 3D Blu Ray Player and played The Police Greatest Hits. The sound was warm and lacked sparkle and detail in the treble. It was reminiscent of the sound I used to get from the Audeze Lcd2's I owned til 6 months ago.
I won a hifiman 601 dap at the head fi meet 3 weeks ago in London and I hooked that up. The difference was remarkable. Treble and sparkle had emerged. Too much bass but a flattening of the eq on the 601 further improved that.
More experimentation proved lucrative because the energiser and (admittedly very cheap) Topping TP22 solid state amplifier through the 601 has moved the Sigma towards tighter bass and more space between instruments and more treble response. The overall effect is warm and cosy. Those who loved the LCD2's warmth but were looking for a wider sound stage might find the Sigma worth a listen.
I have hae some great advice already regarss what works well with the Sigma Pro and in time I can have a few listens although I have to say my needs are rather exclusive. I am only intending to use equipment that has DC outputs up to 24V because all my Sigma kit has to run on battery. A tall order for a headphone which seems to respond better to power input than any headphone I've experienced....
I hope that over the while we can keep up the interest in these ugly beauties and keep the phones being used .
Regards to all current and previous users out there, there must still be a few:)