If I had a ref 5 se I would not use this as a pre-amp! I would expect the Mytek to pair well with the 430. Though I would also expect the internal DAC card to give the Mytek a good run for the money. I am using an LCD-X and Alpha Primes' with it and they are working beautifully. So I would expect the 560 to work well. All m y Sennheisers love the 430. I have not had a bad pairing yet.