I use the 99 amp (and I also own the Quad 909 amp)with my Harbeth C7 speakers and also own Spendor s3/5 speakers and had 988s on long term loan.
I specifically like my headphone set-up because of its "similarity' to the Quad/Harbeth speakers- I use the Benchmark DAC1 as my headphone amp (as well as source) with Beyerdynamic DT 880 and AKG 701 headphones (The Beyers are closer to my speaker sound.)
Obviously the DAC1 is more than you may need, but in any event this was the solution I devised for myself. (As CD was my only source in my audio room, I ran the DAC1 directly to the Quad amps.)
I specifically like my headphone set-up because of its "similarity' to the Quad/Harbeth speakers- I use the Benchmark DAC1 as my headphone amp (as well as source) with Beyerdynamic DT 880 and AKG 701 headphones (The Beyers are closer to my speaker sound.)
Obviously the DAC1 is more than you may need, but in any event this was the solution I devised for myself. (As CD was my only source in my audio room, I ran the DAC1 directly to the Quad amps.)