My experience with B&W and electronics and cables in that price range and below is that the electronics and cables are usually responsible for the HF distortion. I am not, however, familiar with your current amp.
I also have not personally heard that generation of 705. I assume its the model reviewed by Stereophile: https://www.stereophile.com/standloudspeakers/204bw/index.html
There is no indication that it is has to be bright. The CDM 1NT definitely was a real smoothie, kind of to a fault.
I have a Hegel integrated amp with my 707s and have also used it with my JBLs 4367s. It is very good in the high frequencies and great overall performer, in my opinion.
I also have not personally heard that generation of 705. I assume its the model reviewed by Stereophile: https://www.stereophile.com/standloudspeakers/204bw/index.html
There is no indication that it is has to be bright. The CDM 1NT definitely was a real smoothie, kind of to a fault.
I have a Hegel integrated amp with my 707s and have also used it with my JBLs 4367s. It is very good in the high frequencies and great overall performer, in my opinion.