Pros: Great LF extension, good detail and sounstaging, very comfortable
Cons: Colored lows, slightly recessed highs, short and wimpy cord
I am an old time audiophile - I started off my headphone "career" back in 1971 with the original Sennheiser lightweight phones (white plastic with blue or yellow foam pads). They were a revelation in the 1970s and as my interest in the hobby progressed, I purchased and enjoyed most of Sennheiser's popular models (except the HD 800 and HD650).
But over the past 10 years or so, I drifted away from Sennheiser and I have mostly used Beyerdynamic or Audio Technica cans. Recently, on a whim, I decided to buy a pair of "refurbished" HD 428s from DAKMART for just $23.98 and I must admit: Sennheiser has come a long way with respect to a closed headphone design.
First, the HD 428s are quite comfortable. Well, maybe even extremely comfortable as they are very light and the fit is excellent. Next, these cans deliver solid, clean, extended bass - impressive bass, actually. Colored? Perhaps. Well, yes a little. And the upper mid bass suffers because of it, but the all important midrange is fine and the highs are very clean and nice, if not a tad recessed. Detail and soundstaging are really impressive for closed phones.
The negatives? Very few, actually. The construction quality is, well, "plastic-y", so these are not super rugged, but certainly they are fine enough for home use.
The only real negative is the short, very thin cord. That is small print that comes with the bargain. The refurbished model I received is the HD 428 "S" version which comes with an extremely thin, 4-foot long cord. It does also come with a 1/4" adapter, a plus for sure, but the cord is silly thin and short - oddly out of place for the excellent sound quality the HD 428 delivers. But don't let the cord scare you off.
In short, the HD 428 delivers in spades and these phones are, without question, a gateway to true high end sound for very, very few dollars. If you are on a budget or just starting out, consider starting here. Pair these with a $50 Cmoy amp or an inexpensive Bravo or Indeed tube amp from China and you'll be pleasantly surprised what your $100 or so has returned in listening pleasure. You may not need anything else.