Hey Dark Helmet!
My Porta Pro's are just stock and to be honest haven't been out of their pouch in quite a while...
So I took the iPod nano 2nd Gen and the C3 out on the deck tonight to compare them both with the PP's. The same music was loaded on both players to make comparison easier all in V0 320K MP3 format. My C3 has all FLAC's on it and I didn't want to convert the FLAC files over to ALAC as they were 24/48 and I wasn't sure how they would convert down to 16/44.1 so the MP3 format is the common ground.
I have recently picked up the JVC HA-S500 CNT headphone when the hype train rolled through town, the S500 is an amazing little can just like the Porta Pro's are, possibly the reason why the PP's have not been getting much love this past little while.
When I got the C3 & PP's I was on an Infected Mushroom kick at the time, so I loaded up the C3 with
Vicious Delicious,
Legend of the Black Shawarma &
Army of Mushrooms
and the Bass from the PP's was amazing for the size of them, with C3 volume around 33/40 when the psytrance is playing. :basshead:
Tonight I put Metallica's self titled album otherwise known as
The Black Album on the nano and C3. The Porta Pro's sounded thin on the nano, the bass drum from "Sad But True" was there but had no quality or thump. The guitar intro on "The Unforgiven" sounded hollow and Hetfields iconic vocals on "Holier Than Thou" just didn't do it for me. I plugged the PP's into the C3 and fired up the same tracks, the drums were back, the guitar intro sounded like it was there on the deck with me and the "Holier than Thou-hou, You Are!" was there in all it's glory.
I also tested the Porta Pro's with my E11 & E17 driven by the C3, EQ 1 on the E11 or Bass +4 on the E17. I find the bass boost on these little amps really fills in the sound of the PP's. They are a bass headphone to start with but amping adds that little bit more that the C3 does not provide on it's own with the basically unuseable EQ settings.
Then I tested the S500's with the C3 and the E11 / E17 and same tracks, much nicer than the PP's, bass is richer and deeper with out drowning out the mids. Then again these are a closed back headphone with a 40mm driver vs a 30mm one.
Hope that is what you were looking for Dark Helmet, no "Audiophile Jargon" I am still learning to speak / understand it...
In my opinion most headphones will benefit from the C3 being amped through a FiiO or C&C amplifier.