I'm sure I've seen them sold separately however they may no longer be available now. I looked at the site bifcake pointed to however they don't sell many spares for the HD600 and HD650. Any acoustically transparent material would do if I wasn't so concerned it might change the sound however...

What is the attraction of the 32Ω version ? It's easy to drive but your amplifier has adequate performance. It tends to be less expensive than the other versions however. It is perhaps the least desirable of the trio, most people are more interested in the 600Ω version. I have one but I'm not...

Anyone know where I can buy some genuine Sennheiser foam inserts ? Not the earpads also.

Your Audient card can power up to 600Ω headphones so I would choose the 250Ω version. No.

https://www.stereophile.com/content/comparison-beyerdynamic-dt-880-32-ohm-dt-880-250-ohm-and-dt-880-600-ohm-headphones

Avoid the 32Ω as per Me x3 above. Easy to drive but loses the refinement of higher impedances. If you like bass then these headphones provide high quality bass, however as you require some volume to get the bass to shine on any headphone the treble spikes start to become problematic. The 250Ω...

People often go for the Sennheiser HD600 for classical and bright headphones of which there is no shortage. I like headphones that accurately portray any type of music but there is a strong tendency for people to acquire headphones 'optimised' for a genre. If your Sennheiser HD650 is one of the...

I thought recording tech. was pretty good in the 1980's. Certainly I don't have any complaints about albums by the Cure in terms of recording quality. I'm surprised no one has recommended the Sennheiser HD650.

Absolutely, there are some old gems in and on Headfi. I've never heard a planar magnet or electrostatic but with headphones there is always some compromise. In the case of planar magnetics it's the upper mids and upwards that don't conform to natures human hearing. It depends whether one is a...

I guess not then. Interesting review of the HD580 precision. https://diyaudioheaven.wordpress.com/headphones/measurements/brands-s-se/hd580-precision/

Was it the Audio Technica R70x - 210g and 470Ω ?

There is very little on the internet or Headfi about these headphones. Very hard to find or purchase and much more expensive than a HD580, HD600 or HD650. I would say the HD580 Jubilee is more true to the source than the HD580, HD600 or HD650. It just gets out of the way. The 2nd version of the...

From what I've seen of the frequency response curves it seems fairly 'flat' in the low frequencies. The bass has been criticised in the past but not because there was too much. It was usually its quality and having too much distortion in this region. How could one come to the conclusion a 'lean'...

Here's some reviews for the modified HD650. https://www.head-fi.org/showcase/jupiter-audio-research-j-mod-hd650-mod.23188/reviews

Has anyone heard the Jupiter Audio Research (JAR) HD580 or had this modification undertaken ?