I can't give you guys what you want, so I will continue to just give impressions with a headphone that practically no one else has(or ever reviewed)!
I'm using my AKG240S primarily because they are my convenience phones. I suffer from the Ety curse...I rarely get phone calls... except when I put them on, so I typically only listen to them at night. Seeing as I only had the amp for a few days. And I've been having too much fun with the AKG240S with this amp to swap...I can't pull some in-depth Ety review outta my...hat. However my AKG240S is a well behaved and balanced headphone so positive qualities will typically carry over and I have briefly tried the amp with my ER4S with the same positive impressions.
I spent more time testing it with my different sources, and it continues to power the AKG240S with gusto on its slim battery supply. I'm just listening to my tuner and CDP right now seeing how well it works with a RCA -> female minijack at the input + headphone extension cord at the output.
The volume pot manages to be smooth and well matched, something I'm always worried about when it comes to portable amps. Initial impressions still hold. A punchy musical dynamic smooth sounding amp deceiving of its size. It has sonic qualities that are much more inductive to enjoyment making it near distraction to analyze/test it.
In anycase how can I give an indepth review without time...of course I do have that selfish habit of only dropping initial impressions and dissappearing just enjoying things to myself. I mean its not like I ever did an indepth review of the AKG240S
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But yes, if after longer listening with the ER4S (which are actually easier to please IMO) I find that it somehow synergizes so poorly with the amp to audibly complain I will post about it, even though I'm pretty sure the amp was designed with ER4S in mind(Fixup does the ER4 cord mods after all)...and not really the AKG's that very few have. So anyhow, I will continue to listen to them as I am now, but will definitely make effort to listen to them with Ety's tonight. Other than that...what do you want me to do...shove Ety's in my ears right now for 10 minutes and come back and say it was "good" or "bad"? Wouldn't exactly be in-depth.
As far as nomenclature is concerned, although I do find Mini-MeTa to be a humorous name, it isn't fair or really realistic for this amp to ride off the hype/success of full-fledged Meta's. That is just common sense? But I think this amp can hold its own especially for its size. Having it hooked up to my CDP with a long headphone extension cord listening to the Gladiator soundtrack, I am still just so impressed with what it can do for the size. I never really liked 4P's + adapter route as too much "stuff" to deal with (4P + 4S adapter + amp) when I lean strongly towards the 4S sound so much anyways. This super Mini-whatever amp costs just about as much as the Etymotic 4P -> 4S adapters...and is so small it verges on being considered an adapter itself in size.
