Picked up a pair via Amazon after verifying return policy... Highly dubious these aren't going to be an underdamped mess but we'll see.

They just copied the text for gen 2 as a placeholder. It even mentions the 2nd gen tuning directly.

T60

Been years since I came to this site... I see somethings never change. Comparing an amp that doesn't require firmware on this issue is vacuous, even for these forums. Fellow Seattle purchaser ^^^ bought day one, also 1.01 firmware. I'd be curious of ANYONE other than...

Thank you for taking the time for this detailed, very patient and gracious response. These plots certainly do speak to some amazing performance, and at the end of the day that is impossible to argue with as a deliverable. I have a fundamental enough grasp on wave physics to be very impressed...

  Duly noted. Bye!

I was replying specifically to a quote calling out the 'critics' of these pairs on a lack of engineering expertise lol. You don't like an appeal to authority? Take it up with the original poster that made it, and better yet don't just regurgitate one back: 'but teh audeze engineers!' For those...

Yup, it's not as though engineers have to conceptualize a design before it exists and is measurable. Carry on, no negative opinions welcome.

I expect you are quite used to condescension from engineers then :p

They may not be the new models, but it occurred to me that of the dozens plus cans and in ears I own and enjoy, the ER4 is the only pair I literally listen to at least once every day. They are my palette cleanser - perhaps even beating out my orthos on pure linearity. With a yearly transatlantic...

Sorry for having an MASc in Electrical Engineering and a negative opinion of these. Putting an amazing bit of transducer tech like this, producing that lovely flat orthogonal waveform,and then immediately jamming it up a tiny tapered nozzle and acting like that isn't just flex sealing up an...

  'Anecdotal' is probably generous in my case - I tend to buy mainly American cans these days so it has been many years since I spent some quality time with the 600s.   The other challenge with the Senns in particular is that they have a reputation for being excellent at illuminating the...

Also for reference (and headphone viewing pleasure), the eponymous UR55 alongside the smooth and youthful SP330:       Although that being said, today listening to them back to back, I would not describe the treble on the SP330 as rolled off in the same way as the UR55; they also don't...

The KSC21 pair I ordered a bit back finally came in. From what I can tell, sound wise they don't seem too objectionable or particularly exciting compared to Koss' more reputable sports clips.   Unfortunately, my overwhelming impression is that these came from the design wing at Koss that seem...

I second the rec to check out the UR40 and KTX Pro: These are smooth and non-fatigueing in a similar manner to the UR-55. That said they are actually older... I can't say any seem that hard to track down in the US these days. For a more modern option, the Koss SP330 offers a similar balance...

These look uncomfortable, and semi open assures that sound will leak and they have no isolation (?)   As someone who already owns ortho over ears, and BA in ears, tell me why I should look on these with anything but pity?

  Interesting, the Pro4AAAT are one of those 'scrubbed' headphones that Koss doesn't carry or mention directly, although I do see a lot of them floating out there new and cheap. . . after doing some research it appears they released in 2006 (several years after 4AAT and 3AAT in 2003), as part...

  Very nice impressions -thanks for taking the time to write it up - I'm glad you are enjoying them!   I must say, my own experience with the KTX Pro was very similar. When I first popped them on, they sounded pretty murky, but after some time they really opened up. I am a bit skeptical of...

  They are highly complementary to the PortaPro.   They give you a chance to try the clip form factor (I personally prefer it, even using the Mylar PPro elements), and the Ti driver is amazingly detailed and linear in the KSC75 form factor. On the other hand, the Porta Pro delivers more on...

I always get excited to hear buzz around low cost, high value performers - newcomers or old. So many headphones are all about marketing and premium industrial design. . . heavy hitters in humble packages are what really fire me up.   Speaking of getting fired up, I thought I'd share these...

  I am very skeptical in regard to dwindling returns when it comes to 'summit fi' grade audio, but I would actually say that the ESP950 is the only other item in Koss lineup I have tried that can claim to present the same value prospect as these very low cost/high performance dynamics...

  The 250 are a strange beast. If you like a pair of in ears that play 'hard to get' these are perfect - the fit's reputation is well deserved. The dual element creates a sound profile that is schizophrenic, very colored but quite unique. There's an audible dip in the mids between the two...

I am digging all the Koss love in here right now!   Not to derail the thread away from the Portapro too much further, but I just wanted to throw in a couple other 'cousins' into the mix in addition to those mentioned:   KTX Pro - really underrated super cheap performers, utilized same Ti...

  Sorry to hear the fit never worked in, it sounds like you enjoyed the smooth sound.   I have a big head and wear glasses - if I set the band so that it is almost entirely the horizontal clamp holding in place, these are super comfortable for me, even for extended listening. Then again...

They are very similar to the DT770... If you are looking to mix it up, I'd look further afield. Edit: specifically in regard to bass, if memory serves the 770 80 ohm is generally regarded as the most bass heavy 770 variant. From what I recall when I tried them a few years back, the reputation...