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  1. E

    Opamps - can you hear the difference?

    Hi! Was thinking of a way to audition and compare dual opamps. Tools for the task: - Modified AD24QS: good quality ADC to feed the digital signal to a computer - Modified VSPS: simple, opamp-based stage that would serve as the platform for rolling different opamps - A Jico J44A-7 on an...
  2. E

    Sennheiser HD5699 'hybrid' (an HD560S with HD599 drivers)

    Hello! I have two HD599 pairs, which I enjoy quite a bit. I also have a pair of HD560S, which I tried to like but to no avail.. So, I went ahead and swapped the HD560S 120Ohm drivers with the 50Ohm drivers from one of my HD599 pairs. You just unscrew the baffles from both pairs, desolder the...
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    Sennheiser HD560S - a mix of two concepts

    I'm pretty curious regarding this new pair from Sennheiser, having owned several from the HD500-series plus a classic HD600 pair. It seems to combine interesting traits from both. If it achieves to blend their strong points by tuning them in succesfully, then we might get a great set. However...
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