And they can all be brought close or closer to spec by changing passive components/design that add nothing to their manufacturing costs. It's not about them being "low spec", it's that they lie about those specs and simple don't care to even try to make a decent product with the parts in front of them.
I'm not sure why some people keep making excuses for this poor/lack of any engineering/testing and their false advertising. Maybe to some people $1000 or even $500 is nothing, but to many people, that is a lot of money to throw away on something that is falsely advertised and likely unusable for the intended purpose. Just because something is sold at a lower price point, doesn't give them a pass on massively (5-20X) inflating the published specs and lying about these objective, measurable properties. The A12 is advertised as being 6W at <1% THD. It actually makes 0.05W at 1%THD and flatlines at 3W@+10%.
There are several options at the $1000 or less price point where the seller doesn't lie about what they are. But because these other folks lie about what they are selling, it hurts legit manufacturers trying to sell products in this price range, and then people jump in defending that practice just because it's a lower price point product... A practice that harms the whole industry, especially a manufacturer from China trying to make a quality product.
And I think the country of manufacture does weigh in on these thing, as if this product was made in the US or in most European countries and this blatantly falsely advertised, they would get in trouble for doing this. In China, they have no worries of that happening. I saw this same thing with film cameras made in ex-soviet countries, they had no shame in selling unusable garbage, advertised to be something it wasn't, as they knew they wouldn't get in trouble doing it.
