What's his website, you mean the reddit index? He's measured the M1060, M1570, M350 planar, M650, and Modern Retro.On Oratory's website there's only mention of M1570 which I'm currently assuming is the open version (not the closed version) - but modifying the closed back to an open version I don't think you can assume will measure the same as the purchased open backed version. In order for you to assume your open backed mod would measure the same as the bought open backed version was that if you bought an identical open backed "earcup plate" to attach to the back and as long as you knew for sure everything else between the two models of headphones was the same - I'm not sure anybody knows that's the case? But, but, but, if you know the only change is the closed back versus the open back then that's ok, but of course you'd still need to purchase the genuine open back plate.......and how do you know for sure that's the only change between the two models?
EDIT: @mr.at has just said in his post above mine that they're using different drivers for a start, so you certainly can't assume that replacing the closed back with an open back as a mod will result in the same frequency response as the open version - it won't. So it seems like the most valid thing to do is still to measure the effect of the mod, as we don't what that effect is currently.
Yes, this is what I said originally. I certainly do not 'assume [they] will measure the same', and if you read back over what I wrote you will see I already said what you then go onto say:
'If the M1060C is literally just a M1060 with closed cups then removing the backs would be a legitimate mod' (added emphasis). I'm not sure how this could be clearer, unless you thought I was using 'literally' in the ironic non-literal sense some people do? (e.g., you're literally jumping down my throat).
'if it's a clear cut case of the same headphone with and without a closed back'
Just to make sure, I then say this still can't be assumed even if it were true for one model:
'it doesn't necessarily follow that this is also true of the other Monoprice models'
@mr.at does then go onto say they're different drivers in response to my hypothetical statement above. This seemed like perfectly reasonable discussion... I suggested it could be feasible 'if' they are 'literally' 'the same' other than the back, mr.at says ah no they're not, ok great that's answered the hypothesis. I can't go back in time and already know mr.at would tell me the drivers are different before he does, before I wrote my post...