“IntroductionHere I am with another amp review and this time, its of the Portaphile 627 MICRO with the stock OPA627s.Keep in mind that absolutely everything in this review is subject to the law of Your Mileage May Vary. A head's up, as this is going to be much longer than my other review as I had far more to test it with so here's a tl;dr. [[SPOILER]] Now that I've gotten that over with, time...” --BucketInABucket
The Portaphile 627 uses three Burr Brown OPA627's, one each for the Right-Left-Ground channels. Each opamp is then buffered with two Burr Brown BUF634s per channel for a total of 6 buffers. This allows the opamp to work efficiently at powering your headphones regardless of being large high impedance headphones or small low impedance current hungry earphones. The OPA627 is widely considered...