I did quick measurement using a power amp delivering just 50W into 8 Ohm load, just one channel.
First - straight into the wall outlet, and then fed through a good quality isolation transformer of about the same size as shown here.
With the introduction of the transformer the current peaks dropped by a factor of 2. And this - with a fairly moderate power delivery.
As I said before - there WILL be effect, whether pleasing or not I can't tell.
My general recommendation for systems of moderate power is usually for AT LEAST 2KVA isolation transformer rating. But if at all possible, go for 4-5KVA.
Consider something like this - it is not too big, and not expensive by the high end audio standards. :)
https://www.ebay.com/itm/Rex-Isolation-Transformer-8-0-KVA-3PH-480Delta-x-480Y-277-DC8HP-K4/182420622365?hash=item2a791dcc1d:g:BtAAAOSw5cNYePy4
