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
I picked one of these up for cheap, thinking it would be be Class D based on its light weight. (I'm still looking for a class D amp that I find satisfying). Looks like I could have gotten fooled (explains why I actually thought this thing sounded too damn good for class D?). I realized that only the Crown DriveCore stuff or DSi series are officially stated to be class D. Crown's lineup is extremely confusing. I'm not sure that even their reps can explain. I don't know if the CDi (non DriveCore) is class AB? Crown is very coy about a lot of shit these days.
Not all digital transports are created equal. Bits aren’t bits. We’ve seen this through the evolution of CD players as well as USB as an audio interface. The quality of the transport matters, even with modern computer-based digital audio solutions that claim to have vanishingly low jitter.
Many are eagerly anticipating the launch of Unison USB for Schiit’s upgradable DACs, wondering “does it really beat SPDIF?”, “is it better than AES”? I’ve had a Unison USB Beta board in my Yggdrasil A2 for over a year now and have been extremely impressed with it from the start. It has handily beaten any other USB implementation I’ve heard (granted I’ve never heard the TOTL stuff like the Berkeley Alpha USB or the dCS Network Bridge).
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
Here is a system that I put together and find to have a sound quality far exceeding the system price point. This will be traveling with me to many meets for the foreseeable future.
All prices in US Dollars.
To my ears this system delivers dimension, depth, emotional connection that help suspend hearing the system and focus on connecting with the music, very similar to how I experience it at shows.