Good match preamp for Pass labs 250.5

Hi everyone,
Thank you for you guys responds. After I posted the question, I have tried four different preamp. First, I tried the ARC LS-25 MK I, but I did not like it because sound was not forward, may be it was not my type. Second, I tried the Simaudio moon P-3, I like this better than the ARC, sound was more dynamic. Third, because I like the P-3, then I had good opportunity to buy a Simaudio P-5 LE with fairly low price from a local audiogoner. I love it, it brings my 250.5 to another level. But few weeks ago, one of my audiophile friends bring his X-1 to my house and I like the X-1 better. I don't know the X-1 can really beat the P-5 LE, but they definitely have better match. So I finally bought a X-1 two weeks ago and plan to buy a Xono later. make all Pass stuffs.
Thank you for you guys responds.

Frank
I would say you should consider upgrading your speakers. The 250.5 is a lot of amp for 804's which are comparatively small speakers. It could easily drive 802 d's or n's.

Is there a problem matching a Cary SLP 05 with Pass Labs X250.5?

The output impedance is 400 ohms for the SLP 05 and the input impedance is 30 kOhms.

The reason I am asking is I have just tried matching my Cary SLP 05 with a Jeff Rowland 625 (input impedance 10 kOhms) over the weekend and the bass was too boomy and dirty. It worked better with a Primare A 34.2 (input impedance 15 kOhms) except the bass di not have enough slam.

Speakers are Vienna Acoustics Kiss.