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I tested this before and I can't really tell any difference. Maybe a tiny bit of extra bass, but basically the same. It's really hard to do A/B comparisons since the pads are a pain to install sometimes. Must be some trick that I haven't figured out.
If you like the sound of the 6400 with stock pads, it'll be the same with the 8400 pads.
It's not like switching the K601 pads to the K702 pads. Very little change with the KRKs.
As I mentioned earlier, the pads are down to $10 on some sites.
Thank you very much for your answer
I already have a pair of good closed headphones,the SHURE SRH840,which I really like,the sound is smooth,musical and refined,open enough,with good soundstage imaging,and without being boring,but sometimes I feel it's a bit bass heavy(not much though,and it seems that positioning on the head plays it's role).
Also,although it's not uncomfortable(after almost 2 years of use),I found the KRK 6400 to be better at this,it is more comfortable on the head,lighter,and it also has a very nice sound signature that combines a lively and enjoyable sound without being harsh,but with neutral characteristics,good balance on all the audio spectrum,and good timbre and good soundstage imaging.It had a somewhat addictive sound,I enjoyed the music when listening to these headphones.
Combared to the 6400,the 840 seems to have a more refined and smooth sound overall(and a bit more laidback nature),and it controls a bit better the "closed coloration" in sound,that you usually hear on closed headphones especially at low to mid priced ones.That doesn't mean that the 6400 are not refined,they are fine,and I didn't find any significant or annoying sound colouration/hollow feeling because of the closed design(maybe a little bit "plastic" feeling at midbass due to the closed design,but that was somewhat nicely mixed in the whole sound).
But the 6400 lacked this bass enhanced feeling,I sometimes get from the Shures(and it ruins a little bit the overall great sound quality),and thats why I asked you about the 8400 pads on the 6400,to see if they add bass weight to the overall sound(which is something I wouldn't like),or cause any other bad changes in sound.
Now I'm thinking what is better to do: Maybe I should try shure srh 940 pads on the 840 to see if the slight bass heavy sound and comfort improve(although I read at headfonia that it's not recommended),or buy a KRK 6400 instead.(with the 8400 pads later)