You might try downloading a free trial copy of Puremusic. It runs over iTunes and improves things a lot. If you decide to buy it, it's only $130. I use it with my iMac and am very happy with it.
You could definitely improve on the Arcam. The W4S is very nice. I'm using an Eastern Electric minimax which I love. As you are using USB, you may be having jitter issues with the Arcam. I'm using toslink/optical and find it works much better than USB. If you stick with USB, make sure your DAC is async.
Hope this helps.
You could definitely improve on the Arcam. The W4S is very nice. I'm using an Eastern Electric minimax which I love. As you are using USB, you may be having jitter issues with the Arcam. I'm using toslink/optical and find it works much better than USB. If you stick with USB, make sure your DAC is async.
Hope this helps.