Super Best Audio Friends

Drop x JVC HA-FDX1 Dual Carbon IEM

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.

Desert ironwood looks awesome -- I think I am saying this phrase every year lol.. regardless, it's definitely another wood I desire to collect.


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.

If SBAF members are interested, @Zampotech said he can make a limited batch to sell here. I think he's shooting for somewhere around $250 + shipping, if I understood correctly.

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