What performance can I expect with AMP X and headphone Y?

[Special Sauce]

Looking to buy a DAC and an AMP for my "1More TripleDriver Over Ear Headphones", and not looking to spend a whole lot money for it. Less than I spend on my headphones at least which I paid about 130$ for back then.

It's meant to be used with my PC at home, (soundcard is broken so USB it is), also for Windows Sonic/Dolby Atmos Mumbo Jumbo, and I am kinda intrigued by these small DAC+AMP combos, less because of a space issue than just general efficiency, and price performance ratio. Eye balling on the "Meizu Hifi" and the "Tempotec Sonata HD Pro", that everyone is talking about *cough cough*.

According to these measurements my headphones just need a mere 0.07mW to reach 90 d BSPL (Sennheiser HD 650 0.13mW just for reference), and 0.051Vrms for 90dB SPL (https://www.innerfidelity.com/images/1MoreTripleDriverOverEar.pdf)

Official specs say it's a 32 Ohm impedence device, it got a Sensitivity rating of 104dB ( I assume this means for 104 d BSPL for 1 mW power) and a maximum power rating of 50mW (which I am not sure where this figure stems from but I read it in a review article).


I'm kinda confused and so my questioning is as follows (Please don't lynch me we were all small, but hard, in the beginning) :

Since THD+N, like distortion, is more or less to be expected to be higher the lower the supplied power level is, how bad is it gonna be or much power can I really drive my headphones with?

0.07mW translates to said Volume some way or the other, but that doesn't mean the headphone works as good as it could I assume... So the sensitvity rating of 104dB is likely closer to an actual user scenario...

But how low would I have to set the volume/power level (in Windows10)
to for achieving less than 90dB if these headphones already freak out at 0.07mW and how much THD+N would I get blasted with then?

Power efficiency aside, should I have picked a pair of headphones that's more power hungry so that the amp, in regards to THD+N, is more forgiving ? (because @1mW the THD+N ratio is at about -81dB for the "Meizu Hifi Pro" according to the measurements on this site's review which is less than I had hoped for)

Aaaand, What happens if the AMP, like the "Meizu Hifi Pro" 's, is able to deliver up to 87mW @33 Ohm ? My headphones probably won't restrict it to 50mW so how can I make sure nothing blows up? And out of curiosity, which modern headphones would ever need 87mW ?


Thanks in advance for clearing up my misconceptions, yours truly, Special Sauce.

 

[Special Sauce]

Alright, fella scientists, penpal alpha hoe here again,

I know I could have been more direct (at a later stage, that i hope I am at now) and I know you hate bitches but like to act as shopping guides (some of you really do and I sell shit all day too), but come on, gimme a hint at least. I like ferraris too when they drive audio and I got good taste. Just tried to showcase my crippled line of thought. Silence I kill you. I love radio and I know how to play a wooden flute, but I know shit about the technical aspects of it. Yes, good responses need time especially when the question is dumb so fuck me cause I am already writing all day long. Just kidding, but long enough.

To abstract a butt further from my own amateur consumer wanna-be engineer ramblings: What I wanted to really know I guess without digging myself too far up the rabbit hole was :


What does sensitivity rating mean?
If device x is rated at err x sensitivity, does it mean the audio playback device (that's my own term) is working to capacity, like I get the 'full' sound and every nipple of the device twisted then just in regards to a certain volume level?

I was also wondering about safety precautions, like how does the speaker and me make sure not to get too much power.
And how does that relate to the volume level, like digital, software based, volume level?

Given the above mentioned measurements of 0.07mW for 90dB SPL and the official 104dB rating, already expecting some exponential rise for power, like how does all of this relate really? Higher volume, higher power?! Higher volume level, higher volume? When does volume actually rise and when is the speaker under full work load giving me all the bass jazz I need?


Also sincerely wondering, which 33Ohm headphones feast on 87mW? Do they still build these, cause I want a pair of those after all.



Also, how long would I need to pay more electricity costs for an audio playback device (that's my own term) that needs a bit more power than just spending it on a dac and/or amp ferarri bucks more instead hoping not to get stuck in the same traffic jam to get the same level of THD+N? (provcative stupid, i know, but serious question, that came from the heart and I'm but open for suggestions how to drive my 1More Triple driver Over Ear command center better than digging on a dongle). Like -err- how to get the best synergy, if eletricity cost is that low and audio equipment that high.


I'm not god, I don't need everyone's response, but I am grateful for every response anyway, even if it is my own. Be warned, cause I will come back at a later stage if I find a better way to pose my question and make my issues comprehensible.. Plus lynching is allowed now cause I ordered "Meizu Hifi Pro" on aliexpress and couldn't even cancel the order anymore, so I am set I guess. Also, Don't hate on a cactus just cause it loves water. Love this forum and all of you, sayonara "Audio Xonar DG". Peace.

 

[Bob-23]

An attenuator adapter might bring you a baby step forward on the stairways to audio heaven.