After some long listening, there is a further improvement in low level detail after fitting the Z-Foils, both vocals and instruments are more defined, I do not notice any improvement in noise as I feel the regulated supply has achieved excellent results in that quarter, as for sibilance, the regulator put pay to that completely, so, do I think these 8 resistors were worth £130.00, in a word, yes, but without doubt the regulated supply's have had the most striking effect on SQ and were cheaper
. Bob