Griffith
100+ Head-Fier
- Joined
- Oct 19, 2005
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The T50RP sound the most neutral out of the three variants according to Tyll and I think he's the only person who's done measurements of the three variants and presented them:
http://www.innerfidelity.com/content/canjam-rmaf-2015-showstopper-fostex-t50rp-t40rp-and-t20rp-mk3-line-refresh#WwFbMUIZUhjHqmh4.97
I'm not sure what you could do to improve the bass response on the T50, I guess you'd need to see a breakdown of the T20 and compare them with the T50 to get an idea of what you could do but I'm sure that a few months from now there will be no shortage of tutorials and DIY for them.
http://www.innerfidelity.com/content/canjam-rmaf-2015-showstopper-fostex-t50rp-t40rp-and-t20rp-mk3-line-refresh#WwFbMUIZUhjHqmh4.97
I'm not sure what you could do to improve the bass response on the T50, I guess you'd need to see a breakdown of the T20 and compare them with the T50 to get an idea of what you could do but I'm sure that a few months from now there will be no shortage of tutorials and DIY for them.