I'm not convinced a new DAC & Amp will give you what you want. The Xense uses the PCM1796 DAC chip, which while not as high end as the PCM1792A used in the Xonar STX, is still a very good DAC chip. The Xense actually uses the same headphone amplifier chip as the STX, the TI6120A2 and the STX has no trouble at all in driving the HD650s and the resultant sound is clear as a bell.
I'm wondering if it might just be a case of not becoming acclimatized to the sound of the HD650s? When I bought my HD650s I had been using AKG K702s for months and so when I first started listening to them they sounded as though I had cotton balls in my ears, very muffled indeed. However, I knew what to expect so I stuck with it and kept on listening for a couple more hours and gradually the sound began to clear up and by the time I'd listened to them for about four hours that night, they were clear as a bell and my brain had been enlightened.
Thing is, if you spend most of your time listening to the HD598s and only try the HD650s here and there, your brain won't have chance to adjust to the different sound signature as it will be expecting the brighter sound of the HD598s. Once you are used to the sound signature of the HD650 they will sound very clear and detailed and the signature will be filed away in your long term memory, so you won't have to reacclimatize if you spend a period without them.
Of course, if you have used them for extended periods then I am talking cobblers and it's more likely that you just don't like the signature.
I'm wondering if it might just be a case of not becoming acclimatized to the sound of the HD650s? When I bought my HD650s I had been using AKG K702s for months and so when I first started listening to them they sounded as though I had cotton balls in my ears, very muffled indeed. However, I knew what to expect so I stuck with it and kept on listening for a couple more hours and gradually the sound began to clear up and by the time I'd listened to them for about four hours that night, they were clear as a bell and my brain had been enlightened.
Thing is, if you spend most of your time listening to the HD598s and only try the HD650s here and there, your brain won't have chance to adjust to the different sound signature as it will be expecting the brighter sound of the HD598s. Once you are used to the sound signature of the HD650 they will sound very clear and detailed and the signature will be filed away in your long term memory, so you won't have to reacclimatize if you spend a period without them.
Of course, if you have used them for extended periods then I am talking cobblers and it's more likely that you just don't like the signature.
