6xx i got them .. the aren't metalhead ... don't heard58x , but 660 (should have same drivers?) i didn't liked them at all ... i prefer 4xx ... hope 58x sounds better than 660s

I like sundara very much is some middle way betweeen 4xx and susvara ... If you can find an aeon open o lcd2c used are good upgrade too...

For that genere if you want potentially the best headphone or one of the best around try to find a used lcd2 rev2 , the pre fazor one... they are black metal really top tier i paid my 500euros used ... But usually require a good amp ... but yeh... that is the black metal champion for me ... i...

Grado... i got grado 80 ... sincerly... i don't like them ... they are unconfortable and hights are piercing ... not good for metal in my opinion... To better 4xx in my opinion you got to go to sundara... that has similar sound but better in almost all parameters... Hifiman made really a sound...

In your list i'll go for he4xx it has a ridiculus price for amping it you can have a good result woth a jds atom or portable fiio a5 spending few money... I think any other headphone is inferior on metal at that price tag...

I got hd6xx ... those headphone aren't the best choice for metal ... but they still can sound very good ... in my tests they can scale up a lot using an otl tube amp ... With solid state ... you won't get anywhere with that headphone So try to find an otl ... starting from little dot mk2 Or...

Yes as I am a cable maker I never think That custom cables are required I got old he6... Never had any issue in nearly 3 years that I got it... Zmf ok they are no cheap but with an otl amp is a killer combo... Here my estro armonico otl with auteur... To reach same qualiti...

The list is quite old... Absolutely auteur aeolus and susvara are top tier headphones... Also the Mr speakers aeon open for some genere is fantastic

Yes he6 requires a specific amp that mat be also relatively cheap using a small speaker amp... Like a used musical fidelity A1... Several people enjoyed it But yes auteur with otl is a top level combo and for metal may I like it a little more than he6... But he6 with thresh metal in my opinion...

Audeze lcd2c is a great headphone .. Another one that I love Is sundara that even if is relatively cheap it has a great sound Never eard the Arya but I eard the he1000 v1 and v2 I like them much more than the 800s...but I would like to prefer the he6... But requires a powerful amp... Another...

May think about to senny hd25

I got audio gd he9 that should have 6W channel but susvy sounds better in my estro Armonico tube otl that should have less than 1W so power is not so relevant.

As I could heard susvara is not so power demanding as he6... And in my opinion sounds better with tube amps...

I didn't liked susvy from ican pro... Enough power but not good sounding in my opinion susvara deserves a better amp

I heard time ago the agx mk2 great amp but it couldn't drive the he6 properly... Recently I got the audio gd he9 that does a wonderful job with he6... And as I can remember I like it more than the gsx, But even if it is one of most powerful amp, should be 5W in class A to the susvara or...