The benchmark is wonderful, I actually own one too. However, the sound is far from warm and full. If this is the type of sound that you are looking for, as stated above, then I think you would do better by putting your money into a Tubed Preamp as opposed to modifying the Benchmark. Mods should be use to improve the underlying characteristics of the component, however I doubt that it will change the Benchmark into something that it's not.
I know people like the purity of plugging the Dac right into the Amp, I've been there and done that too, however you will be amazed at just how much better, warmer and richer the sound could be from a nice tubed preamp.
I know people like the purity of plugging the Dac right into the Amp, I've been there and done that too, however you will be amazed at just how much better, warmer and richer the sound could be from a nice tubed preamp.