Luxman 590axii with KEF Reference 1

You may want to consider the KRELL K-300i integrated that I am using to drive KEF LS50's. It is very smooth (tube like) and very powerful. It will rock those KEF 1's. This KRELL has amazing bass on both my LS50's and Thiel CS3.7.

In the future, the LS50 will be replaced by a Yamaha NS5000 which has a huge bass driver. That should be a pretty incredible combo in the big room I have the KRELL in.

I also tried the CODA CSiB with both of the LS50 and CS3.7. It is also a great sound with a little less bass than the KRELL. The CODA has 3 versions and I had Version 1 with 150 | 300 at 8 and 4. The first 18 watts were in Class A. I think both of these would have more bass power than what I remember from the Luxman 509x and the m900u. Both are great integrated amps.

You should find previous threads on the 590.
It is a seriously technically under-rated amp, which would do about 100 WPC if it wasn't for the preconditioning requirement.

Music Direct has a 60 day return policy, but please check it out for yourself. It looks like if you just don't like the sound/performance, you can return the amp, and you'll need to pay the return shipping charges.

I’ve had the Luxman in my system for a couple of weeks now and it’s amazing. Punch, control and clarity. So much more of all that compared to my old PrimaLuna Dialog Premium HP. Highly recommended!

Yes, it's very good, the L-590AXII. It punches well above its price range and rival the uber-integrateds costing up to $20,000 or more.