With the Cambridge it was anything that involved large orchestral forces, or anything that was less than perfectly recorded such as the 1980s output of Barclay James Harvest. The treble always seemed to be detached from the rest of the frequency range.
The Pioneer was far less problematic to be fair but I found its imaging to be unstable and it could sound a little thin and lifeless on occasion, again in larger scale stuff. Simpler stuff like the early Tom Waits albums, sounded lovely but something like the Rostropovich recording of Shostakovich Symphony 5 on LSO Live (which is beautifully recorded) somehow never came to life.
The Pioneer was far less problematic to be fair but I found its imaging to be unstable and it could sound a little thin and lifeless on occasion, again in larger scale stuff. Simpler stuff like the early Tom Waits albums, sounded lovely but something like the Rostropovich recording of Shostakovich Symphony 5 on LSO Live (which is beautifully recorded) somehow never came to life.