the only thing they could’ve done better IMO would’ve been to add an additional note at the bottom for further clarity, saying “maximum power is obtained with 3V in” or something like that.
I went through the published specs of the L30
in this posting. To recap, Topping publishes unusually complete and honest specs. There is no "lying." All the information is there for the buyer to determine whether the amplifier is suited to his or her purposes.
While it's not exactly rocket science, it takes some engineering insight to understand the different specs and their relationships. For instance, how much power an amplifier can make has nothing to do with the position of the volume knob. You can have a very powerful amplifier that won't play loudly on a particular headphone if the system gain distribution isn't right.
I think the focus on numbers here may give some people the impression that things are simpler than they actually are. With respect to this topic, the first thing you need to get right, given a source, an amplifier, and headphones, is the gain distribution. You want the volume knob to be roughly in the middle of its range when listening at your preferred level. After that, you want enough power to avoid clipping, and maybe a little extra for headroom.
The rankings on this forum might lead to specsmanship. If Topping makes an amp that puts out 3500mW, they're going to advertise it as such. It's a legitimate spec and there's no deceit because the sensitivity is clearly spelled out. It's also largely irrelevant, for reasons I explained in my earlier post.
To repeat what I said at the end of the other post, my purpose isn't to defend Topping, but to respond to incredibly rude comments by people who evidently have no idea what they are Topping about.