Super Best Audio Friends
The evolution of the original irreverent and irrelevant and non-authoritative site for headphone measurements, i.e. frequency response graphs, CSD waterfall plots, subjective gear reviews. Too objective for subjectivists; too subjective for objectivists
Before we even say another word about this, we need to start here: https://www.superbestaudiofriends.o...vc-fd01-a-new-contender-for-best-dd-iem.6500/
@james444 is always digging up random IEMs and modding them with impressive results. He posted a few before and after measurements of the mods, and before long, we purchased a JVC HA-FD01 from a Japan to send along on our loaner program. Most of the folks who heard the loaner, at least those earlier in line, should be aware that I had only implemented a quick and dirty version of the mods. The "authentic" @james444 mods were much more intricate. I think @zerodeefex can tell you guys what a pain in the ass it was for him to do it right. I hindsight, I guess I could have paid my kids (with their smaller fingers) to do the proper mod for me. Anyway, the point I wanted to make is that the proper mods result in better bass quality compared to the quick and dirty version.
According to the Wood Database, this wood is as hard (3,260 janka lbf) and dense (75 lbs/ft3) as African Blackwood: https://www.wood-database.com/desert-ironwood/
(harder and denser than Cocobolo)
FR measurement (not Jude's but Zach's) looks interesting too. Not sure about which pads were on each. @zach915m may chime in.
I've spent a fair amount of time with this "Shortest Way" amp. I still have some comparison testing to do, especially with the ZDT Jr. but have enough thoughts to get started.
So, what is this thing?
- Single-ended, Triode, using 6Z51P tubes
- Output transformers (two types of steel to improve performance at a smaller size, would have to use regular, larger transformers if more are produced)
- Class A
- No capacitors in signal path. Really just a pot and a few resistors, that I can see, plus tubes and OPTs.
- "No feedback except natural communication through the cathode resistor"
- Short signal path