what would be a more suitable amplifier for a NAC 552. NAP 300 or a 135s? I understand a 500 would be ideal but that is currently well out of my budget
Speakers will most likely be linn Isobarik.
I've used Briks powered by Naim amps for decades until a few years back and they work well with any Naim power amp of 250 and up, but you do hear clearly the different character of each amp.
The 135 mono-blocks have their own unique and engaging sound and sound very different from the 300 and 300DR.
The 300DR will win an all respects IMO, but between the non-DR 300 and 135 they each have their strengths and either will work well musically, but have very different character.
The later Naim amps reveal more detail and have better HF response IMO, possibly due to the better output power transistors available and gradual improvements as you would expect. But the 135 has its own dedicated power supply and transformer for each channel so has some 'boogie' advantages from how I hear it over the non-DR 300. The 300DR is better I think due to the better DR regulation design.
In short all work fine musically with the 552 and Briks.
Passive Bi amped Briks with 200 & 250, the regulated 250 shut down when driving the bass & mids.
Switched amps and the non regulated 200, did not shut down when driving the bass & mids.
A little less headroom, but not that noticeable!
But Passive Tri Amped Briks are a delight, next upgrade, Active Briks!
HCDR> 3 x 250.2> Briks
I would imagine the 552, would bring more to the party!
But the 282 isn't missing a beat!
Enjoy your Music!