Hi Csr827, it will be obvious audible if you overload the input. The sound will be unbearable thin, distorted and somehow "breathless" (in a most negative sense of the word) and it will be obvious that something is entirely "wrong".
Get the manufacturer contacted and ask him about the maximum allowed input voltage in the phono input.
He should know the answer within 5 seconds, as this is one of the key parameters of any phono stage worth the name.
But please keep in mind, that the influence of a SUT is diminishing with increased source output of the MC. You already have a medium to high output MC. Don't expect even a well matched SUT to make a difference like night and day. What you will get is increased dynamic, punch and "inner gain" (in the sense of more power, as if you are running your car with the next more powerful engine..).
But these effects will be rather small.
Get the manufacturer contacted and ask him about the maximum allowed input voltage in the phono input.
He should know the answer within 5 seconds, as this is one of the key parameters of any phono stage worth the name.
But please keep in mind, that the influence of a SUT is diminishing with increased source output of the MC. You already have a medium to high output MC. Don't expect even a well matched SUT to make a difference like night and day. What you will get is increased dynamic, punch and "inner gain" (in the sense of more power, as if you are running your car with the next more powerful engine..).
But these effects will be rather small.