@tjag I was originally excited to listen to the Luxman 509x integrated. When I demoed it with a Harbeth speaker (forgot the model) I thought it was pretty good, even though Harbeth are not the speakers that I wanted to buy.
I then heard the Luxman c900u and m900u in an all-Luxman stack with the same speaker. It was so much better than the 509x so I crossed off the 509x from my list. I was thinking of getting the m9000u with a cleaner sounding preamp. I was thinking of the Mola Mola Makua. The c900u was too much warmth.
Along comes the Benchmark HPA4 and LA4 and I figured that could be a much lower cost Makua. So I got the HPA4 to see if it would work. I loved the HPA4 and considered it doing what the Makus is supposed to do (never heard the Makua).
I tried the HPA4 with a CODA #8. The CODA #8 is often compared to PASS but maybe not as warm (or hot). I loved this combo and have recommended it to many people.
I also love the HPA4 (later replaced by the LA4) with the AHB2 monos. The AHB2 does not have the same power at 2 Ohm as the CODA #8. I plan to use this stack with a less demanding speaker along with a 2nd Mustec 005 DAC (ASR bad measurements) so I will essentially only hear the DAC because the other 2 pieces are ultra-quiet and ’soulless’. The DAC and speaker provide the soul.
For me, adding a Benchmark piece offers some clarity to the sound that makes me feel like that is the correct way to sound. I do not like to have too much color in my sound. The 07x and AHB2 was preferred by me over the 07x and CODA #8 but I needed the extra power at 2 Ohm of the CODA #8 with my Thiel CS3.7.
I think the KRELL XD lineup is as good as the Luxman m900u amp. Actually, better to my ears.
You have a 30-day home trial with the Benchmark gear. The tube Schitt Freya+ preamp ($1000) works nicely with the AHB2. It is super quiet. I would try that first with a AHB2 over the 07x. I have owned the Freya+.