Hi man,
Thanks for that thorough reply. I get all of that. I have a list of test tracks; I buy CD's and flacs, including a smaller number of 24 bit; I go back and forth and spend hours doing A/B/C tests. In this case, the difference between the Diablo and dx300 when accounting for all other factors is pretty small, at least to my ears, especially with iems, but even with the he6se, it's small. Micro details go slightly in favor of diablo, but it's hardly discernable. You have to really listen for it.
I’d agree with this as what is typical. It is why many people will say that ‘all amps sound the same’ (and take away that ‘amps are JUST for extra volume’)..
Yet audiofoolz who have been doing this for yonks, mostly the ones with a ‘music’ background (as their profession or has been ‘serious hobby’), describe how amps change up the soundstage playback,.. talk about ‘veil‘ being lifted etc.
The notion is that with or without veil, the underlying music (from the recording) is still there, they are rather describing the playback differences that the amp (or DAC etc) changes the presentation to...
Its why an amp that appears to make certain instruments holographic might be preferred for certain recordings or genres.
I must apologise as my previous post wasn’t really finished (nor reviewed)- I had an inbound phone call and had to rush away (and didn’t return)... What I had hoped to write/ the intent of my post was to list a few specific recordings that scale well.
It isn’t about recording quality specifically, nor whether files are compressed or otherwise- I could use a disc of MP3s to test equipment.. (but I would generally enjoy their recordings, if critically listening, a lot more if they were lossless; that being said, a ‘three piece band’ that isn’t too musically dynamic, not using much echo/reverb and with poor attention given to spacing the instruments in a 3D plane, would sound so near to be identical to a lossless version of the same track that MOST PEOPLE COULD NOT PICK THEM APART. However an orchestral recording with rows of musicians and the environmental sound that is the recording space (various halls and cathedrals etc) would be murdered as an MP3, again, mostly for critical listening.. (although the reduction in air space that the Mp3’d version would impose would kill enjoyment even casually for ‘many’).
It isn’t really about file sizes but engineering attention and effort.
Some discs just have a cleverer mix that needs better equipment to pull out the layers..
Whether it be phase shifting electric guitars, or super dynamic ‘highly layered’ complex recordings.. heck even ‘near vintage’ blues recordings with tape hiss - each song can reveal strengths and weaknesses of certain equipment.
I can also honestly say that I have thousands of albums that barely change in playback from one piece of kit to another.
Regarding amps it can often come to ‘headroom’; does some classic Cat Stevens recordings (or just about any Quentin Tarantino soundtrack) sound softer vs other recordings (encouraging users to turn up the volume on specific albums?
Some amps homogenise the sound and make all recordings come across as ‘similar volume’.
I have given the example of Suzanne Vegas’ ‘Fat Man and Dancing Girl’ (album “99.9 farenheight degrees“), as a track I use to test dynamics.
If that track turns into a ‘wall of sound’ I simply stop listening to the amp, as many other tracks that push dynamics (require headroom), they will playback, sure.. and might even sound viscerally engaging.. but to me they would be fatiguing, and a few test tracks can tell me a lot about what equipment does right, and what it doesn’t.
When I was playing around with some Sony MDR Z7s and a PHA3 headphone amp for the first time, I couldn’t believe how well the ‘Mika’ album ‘Life in Cartoon Motion’ scaled to reveal the nuances that the amp could bring to the playback. Sure the headphones were good, but without the right amp they could easily be constrained to delivering ‘less performance’.
That Mika album isn’t on my test discs lists, but ‘casually listening’ - the extra layers that that well mastered album had been hiding showed that it was an album that scaled well to ‘better equipment’.
Many years ago now I posted a thread on headfi regarding how a range of amps could affect the playback quality of music, and ‘not simply because of the extra power that some might house’.
To be honest I have close to zero interest in amplifier power. It is one metric that doesn’t qualify sound quality, and I have seldom had need for more power.
That being said, I do run outboard power amplfiers FROM THX ULTRA receivers, quite often I let a flagship receiver drive surround back and front presence or height speakers (ie the speakers that need the least power).. I am sure amps that can deliver 130-180Watts of power per channel to 7 or more speakers can easily drive four speakers that are hardly used and are generally not peaking at the same time ‘very easily’.
As long as an amp is in its comfort zone for the music we care to hear, then we have ‘enough juice’.
Where differing quality amplifiers can reveal themselves is in nuances like soundstage and 3D depth.
I use an old Enigma track to test soundstage as it has a lot of bass and a soundstage that is easy to fall apart as the track layers more powerfully.. as a track it proves handy for testing ‘just a couple of metrics’, and that is the catch; knowing which tracks demonstrate ‘certain aspects’ of sound quality, and having a range of test tracks to check WHAT MATTERS MOST TO YOU..
eg I am not musically trained, and never had a good grasp of correct tonality.
For the first twenty years of my hifi journey the two most important metrics to me, without a doubt, was soundstage and noisefloor.
TJ Eckleberg “Two Inches of Darkness” is great for revealing whether an amp can make the lyrics clear.
Songs like ”Trout” by Neneh Cherry should have layering and Michael Stipes voice can actually be ‘clear as day’ towards the end of the song (when they are layering); on good kit it is easy to hear what BOTH ARTISTS are singing.
As a great album or two I’d suggest
One Giant Leap “What About Me” (complex well mixed tracks)(diverse)
soundtracks - Blues Brothers 2000 and City of Angels
Many could give a tonne of others (I could too),.. and none of the aforementioned are my ‘goto test tracks’ (TJ Eckleberg certainly is, but mostly cause I enjoy spinning him)
For amps testing I used to love Nine Inch Nails and Tool etc,.. but that is when driving large speakers etc..
regarding headphones (amp matching), generally getting output impeadence right is the only trick to worry about, so long as you can turn it up to the level you seek.
Beyond that there is a lot of sound tuning as amps DO have different playback characteristics that can favour macrodynamics, microdynamics, soundstage, holography etc...
Its why PRaT gets a mention from musician backgrounded reviewers- we all seek out performance, sure.. but knowing what we want and what tests can ensure we are getting it is a ‘long road’.
Ideally headfiers who understand can help (a little) on the quest...
As Guttenberg often states “Enjoy the Music”.
(And I will reiterate often- buy the part that gets your ‘toes tapping’)