But seriously, I am very much uneducated on the subject of headphones and power, so I do want to learn more. My best pair of cans right now is the "just" the Hifiman HE-300s, and all I know is that I have to switch my E10's Gain setting to high for them to get decent volume and sound their best. But I haven't learned the science behind that.
Headphones have a set impedence, which I'm sure you know about, but also a set power requirement to run to their full potential. Conversely headphone amps have their own unique power outage, for example the E17 puts 250mW into 16ohms. Often, if the manufacturer hasn't provided a breakdown of the output at various ohms, the one listed is to be taken as the "peak" and everything subsequent will be degraded.
250mW into 16ohms isn't much and even less when it moves up to 30ohms, which is an average for most low-fi and many mid-fi headphones. Regardless it's more than enough to power most of said headphones because they may only require 50mW to run to their full potential.
Moving up however is different. High End, or Summit-fi, headphones are plagued with hefty power requirements which mean the amp on the E17 falls short. Even outside of High End, most standard Mid-fi choices like say the ATH-M50s, benefit from the higher ceiling of more power output as well.
I'm going to need to replace my TMA-1s with new closed cans soon, and I want to take a big step up, but now I'm wondering whether I need to upgrade my DAC/amp situation first.
fyi, whatever I get will be connecting out of my laptop via USB, so size is a factor, to an extent.
I welcome thoughts/advice from anyone.
Upgrading your DAC/Amp is always beneficial regardless, but it doesn't have to be an expensive venture. As I've listed on this page already,
Audio-GD is the go-to for high power but reasonably priced DAC/Amps.
As for suggestions, that all depends on a few things;
1. What's your budget?
2. Looking for a bassy can ala TMA-1s?
3. Keeping it indoors?