Actually they don't sound bad.
The Headphone out of my Marantz surprised me by producing nigh on equal performance in the highs as the Solo (2007 pre SRG). I had picked the Solo for its superior performance in high detailing vs Heed's Canamp. It actually drove the K701 quite well up to reasanoble levels. I slighly prefered the ammount of mid bass from the headphone out of the marantz vs Solo 2007.
there were some obvious gripes as well.
- headphone out had little gain. max volume produced squashed sound while the Solo would be at 12 o clock.
- the Solo wiped the floor with the marantz when it came to musicality. The Graham Slee simply makes you FEEL the emotion in music, while the marants just presented the notes.
The cards have been trully shuffeled though with the coming of the Solo Ultra-Linear. It performs so much better in so many ways than the marantz.