google XBS audio, they have a website. They are also on ali.
DHL is one of the fastest from China apparently.
I went with FedEx and it took an extra week to get here.
Keep in mind that Chinese holidays are starting up soon, so that section of the globe is going dark for a while.
Here is what a 20k does 1 of 4 channels @ 8-ohm into 2 LMS-18:
Here is what a 20k, 1 channel of 2-ohm into SAB-24 (7cuft net sealed), and 3 channels of 4-ohm LMS-18:
and 2 20k's, quad 2-ohm, and quad 4-ohm, also 1 14k dual 4-ohm, and also other amps and cones:
I have 200A @ 120V dedicated for just my HT room (2awg ~100ft, fed by 2 20kA pole transformers ~50ft, it pretty much NEVER sags below 115v, often just a rock solid 120V).
Each amp is on a dedicated 30A 120V breaker (10awg ~1ft), although 240V 30A would be more-ideal.
(Amp is easily changed to 240V with a few solder points.)
The 20k has twice as many power supplies as the 14k, so it is likely hitting higher powers long-term, the only downside is that it is also twice the power-density and so heat-management and fan-noise can be a contention. But it's almost half the price of 2 14k's from Sanway or Smiths. Is what it is...
I've pushed mine pretty hard, not to clipping though, no problems thus-far (about ~100 hours of use on the 20k's).
My 14k is a Sanway and is about 4 years old, no problems there either (1000's of hours.)
My iTech 8k is ~9 years old and is pushing close to 10000 hours I'd imagine, also no problems.
Many sessions of BassILoveU, EOT Intro, WOTW etc...
Who said switcher amps can't be reliable or are weak?