Short answer is yes the NAD 320BEE should.
Going from PSB B 25 to Imagine B is an upgrade, not in the bass dept though and thus if you upgrade you should keep the PSB 5i sub as stated above.
NAD and PSB have great chemistry together. And yes they are owned by Lenbrook Industries.
I have a NAD 326BEE which is a bit newer than your 320BEE. I have used this little amp to drive a pair of Dynaudio DM 2/10 and JBL S38 without any problems.
Going from PSB B 25 to Imagine B is an upgrade, not in the bass dept though and thus if you upgrade you should keep the PSB 5i sub as stated above.
NAD and PSB have great chemistry together. And yes they are owned by Lenbrook Industries.
I have a NAD 326BEE which is a bit newer than your 320BEE. I have used this little amp to drive a pair of Dynaudio DM 2/10 and JBL S38 without any problems.