It is my opinion, B&W speakers sound best (as with most speakers) with an amp that has "jump" factor to it. Amps in my experience that play dynamically are:
Mark Levinson #27.5
Fully restored (recapped) by authorized repair center, George Meyer in Los Angeles. This amp is for sale here:
https://www.georgemeyer-av.com/mark-levinson-no-27-5-dual-monaural-power-amplifier/
![Mark Levinson No. 27.5 dual monaural power amplifier](https://www.georgemeyer-av.com/wp-content/uploads/2021/08/Levinson-27.5_1.jpg)
![Mark Levinson No. 27.5 dual monaural power amplifier](https://www.georgemeyer-av.com/wp-content/uploads/2021/08/Levinson-27.5_5.jpg)
This Mark Levinson integrated amp, #383 also on Meyer's website (fully refurbished) would also be a great choice, considering the $3,000 dollar cost.
It is located here:
![Mark Levinson No. 383 integrated amplifier](https://www.georgemeyer-av.com/wp-content/uploads/2022/07/Levinson-383_1002_1.jpg)
![Mark Levinson No. 383 integrated amplifier](https://www.georgemeyer-av.com/wp-content/uploads/2022/07/Levinson-383_1002_6.jpg)
My last suggestion is this Esoteric A-02 amp being sold at The Music Room (TMR). They want $6,000 dollars for it. This is a beautiful sounding amp; I know first hand as I currently have one of these. 400 watts into 4 ohms! These will make your B&W's play with some dynamics. It's a heavy, but manageable beast at just under 100 pounds. It is located here:
![Esoteric A-02 Stereo Power Amplifier; A02; Silver](https://cdn11.bigcommerce.com/s-6naz0isypk/images/stencil/732x732/products/52040/338408/43000-4__41158.1657145938.jpg?c=2)