I’ve been running a Hartke HA2000 into a pair of 4x10s, one an old Peavey and the other an Ashdown 410T. It works wonderfully for 4-string basses, but the low B is less than optimal. I have some old Samson S1000 power amps sitting around from back in the day.... I have bridged an S1000, and am using that (1090 watts) to power the Ashdown. The Peavey cab is getting the Hartke’s full 120 watts. I tried it using the S1000’s parallel mode to power both speakers, and it’s great that way too. It’s making a difference in the reproduction of the low-B string, as well as everything else. Ideally cabinets that could get down to 30 hz (like the new Ashdown Neo) would make it even better, but for now and the near future this will suffice. Btw, I love those old Hartke bass amps. Tube and SS input gain, compression, low and high pass filters, 10-band EQ with the lowest band centered at 30hz.... very flexible.