Adrianob,
Since you already have the Naim Unitilite for the P3ESR, best is to go with something else other than Naim. The C7ES3 is one of my favourite Harbeth speakers alongside the SHL5 Plus. I have listened to the Leben CS600 at a friend’s place driving the M40.1 (he also has the P3ESR). We compared the Leben with other amps such as Naim 32.5/135, Exposure 2010S and LFD Zero LEIII just to name a few (he has many solid-state amps). The transparency and detail of the Leben CS600 are exceptional, something which the other solid-state amps could not match. The Leben sounded leaner, lighter and more refined than all solid-state amps we have tried (which sounded darker in comparison). Ultimately the CS600 falls a little short in the power department for the 40.1s but it surely has potential.
Since you have listened to the Leben CS600, presumably with your C7ES3, that is the best experience that you can have. Best is to listen to other options such as the VAC before making the plunge. For the types of music that you listen to, I suspect a high quality tube amp will be more suitable for your application. Good luck.
Since you already have the Naim Unitilite for the P3ESR, best is to go with something else other than Naim. The C7ES3 is one of my favourite Harbeth speakers alongside the SHL5 Plus. I have listened to the Leben CS600 at a friend’s place driving the M40.1 (he also has the P3ESR). We compared the Leben with other amps such as Naim 32.5/135, Exposure 2010S and LFD Zero LEIII just to name a few (he has many solid-state amps). The transparency and detail of the Leben CS600 are exceptional, something which the other solid-state amps could not match. The Leben sounded leaner, lighter and more refined than all solid-state amps we have tried (which sounded darker in comparison). Ultimately the CS600 falls a little short in the power department for the 40.1s but it surely has potential.
Since you have listened to the Leben CS600, presumably with your C7ES3, that is the best experience that you can have. Best is to listen to other options such as the VAC before making the plunge. For the types of music that you listen to, I suspect a high quality tube amp will be more suitable for your application. Good luck.