Raul -- while I'm not doubting your kind intentions (nor anyone else, surely) I still fail to understand why & how the application and subsequent removal of a cleaning agent+rinsing liquid (distilled/de-ionized water) on a rotating surface (LP) will affect the electrical properties of the upstream system (=equalisation). That's what you're inquiring about, at least that's what you're saying.
The stylus-groove is a mechanical contact so, the better the contact the better the ultimate result.
If you're wondering whether after the rinsing there is residue left which, in turn, compromises this contact affecting certain frequencies (hence "equalisation" effect)... it really doesn't seem to be the case: most people report less surface noise (removal of particles deleterious to stylus-groove contact) while no-one has reported a reduction of high frequency content after the "cleaning" (which could be an indication).
Ultimately, calling upon the mastering engineers is, I would agree with others above, a somewhat nebulous proceeding for the reasons already offered -- likewise with speaker manufacturers. Rather, you could experiment along the following lines:
Find an original master-tape--> cut two LPs; store 1 LP leave the other out (to collect dust etc). Later, perform a spectrum analysis of each LP. Apply cleaning to dirty LP. Perform spectrum analysis. Listen to "cleaned" LP vs stored LP vs master tape. If game, "clean" stored LP. Spectrum analyse it "cleaned". Listen again, comparatively. Of course, take notes all along.
Copious and difficult proceding, indeed.
At the end of the day, however, this is all just about cleaning the surfaces of a cut vinyl disk and comparing results before & after (i.e. that's what the thread is about). The "testing" conditions, while not rigourously scientific, seem adequate enough for the experiment: same downstream system, same cleaning machine, etc; the application and removal of "cleaning liquids" is the only "before & after" point. It doesn't seem like anyone has reset their riaa equalisation curve...
Cheers
The stylus-groove is a mechanical contact so, the better the contact the better the ultimate result.
If you're wondering whether after the rinsing there is residue left which, in turn, compromises this contact affecting certain frequencies (hence "equalisation" effect)... it really doesn't seem to be the case: most people report less surface noise (removal of particles deleterious to stylus-groove contact) while no-one has reported a reduction of high frequency content after the "cleaning" (which could be an indication).
Ultimately, calling upon the mastering engineers is, I would agree with others above, a somewhat nebulous proceeding for the reasons already offered -- likewise with speaker manufacturers. Rather, you could experiment along the following lines:
Find an original master-tape--> cut two LPs; store 1 LP leave the other out (to collect dust etc). Later, perform a spectrum analysis of each LP. Apply cleaning to dirty LP. Perform spectrum analysis. Listen to "cleaned" LP vs stored LP vs master tape. If game, "clean" stored LP. Spectrum analyse it "cleaned". Listen again, comparatively. Of course, take notes all along.
Copious and difficult proceding, indeed.
At the end of the day, however, this is all just about cleaning the surfaces of a cut vinyl disk and comparing results before & after (i.e. that's what the thread is about). The "testing" conditions, while not rigourously scientific, seem adequate enough for the experiment: same downstream system, same cleaning machine, etc; the application and removal of "cleaning liquids" is the only "before & after" point. It doesn't seem like anyone has reset their riaa equalisation curve...
Cheers