When some people/reviewers commented certain phono stage has "powerful bass", it's better to take it with a grain of salt. Unlike pre-amps or power amps which do not have any EQ circuit in their signal paths, a phono stage has a reverse-RIAA EQ built in. And some designers will "cheat" a little by tweaking the EQ curve to achieve the desired "sound" for the device. So when we find a phono stage to have very impressive bass performance, it's likely not from the superior circuit design or strong power supply unit, just a trick of modifying the EQ.
The three phono stages tested below are all priced at the ~8000 USD range. Using the same cartridge Lyra Kleos (without changing any parameters) to feed the test signal, I measured the high-frequency responses to be virtually identical. Whereas below 5kHz, the 2nd and 3rd devices obviously display higher output levels, ranging from a couple of dB to the extreme case of nearly 5 dB at the lowest end of the spectrum.
Incidentally, the first two are UK brands, and the 3rd one from the USA. In my experience, phono stages made by the US-based brands tend to have boosted bass responses similar to the 3rd device.