imackler
Headphoneus Supremus
- Joined
- Nov 17, 2008
- Posts
- 5,912
- Likes
- 527
Quite simply, I want to buy an amp for the HD25-1ii.
But everyone I pm tells me their amp/source has more than enough juice! While they're probably all right, I'm trying to find some concrete grounds for comparing the output power of various amps into a 70 ohm headphone. But really, I want to know a formula that will help me do this for any impedance headphone, whether 32, 70, 80 or 300? Perhaps, there are too many variables to to this well, especially with some amps having different gains. But amp manufactures often list their mW at different ohms; some at 16, some at 32, some at 300. It's not standardized.
Is there a formula that lets me figure out how many mW each gives at a certain impedance? In my case this time, its 70ohms. But I'm just as curious at 80 ohms, 300 ohms, etc.
I don't know that this is actually valuable, for myself or anyone else. I'm not saying it sounds good. And I don't know what other variables I need to know. But I'm obsessed now, and I can't go back until I have an answer!
Here are some of those I've compiled:
UDAC and UDAC 2 (Portable Amp/Dac)
Power output: 80mW @ 16-Ohm
Fiio E5 (Portable Amp)
Output Power: 100mW (32ohms ); 18mW (300ohms )
Fiio E7 (Portable Amp/Dac)
Output Power: 150mW (16Ω); 16mW (300Ω)
[size=10.5pt]Ibasso D2 (Portable Amp/Dac)[/size]
[size=10.5pt]Output power[/size][size=10.5pt]:[/size][size=10.5pt]Up to 100mW into 32[/size][size=10.5pt] Ω[/size]
[size=10pt]Ibasso D4 (Portable Amp/Dac)[/size]
[size=10.5pt]Up to 230mW into 32[/size][size=10.5pt] Ω[/size]
[size=10.5pt]Ibasso D6 (Portable Amp/Dac)[/size]
Output power:Up to 650mW into 32Ω
[size=10.5pt]Soundmagic A10 (Portable Amp)[/size]
Maximum Output Power : 70mW (33Ω)
E11 (Portable Amp)
57mW into 250Ohm (From quote from E11 Thread)
[size=10.5pt]Ibasso T3D[/size]
[size=10.5pt]120mW [/size](into 32? I'm guessing)
[size=10.5pt]Ibasso PB1[/size] (Portable Amp)
[size=10.5pt]1400mW into 32[/size][size=10.5pt]Ω[/size]
[size=10.5pt]Ibasso PB2[/size] (Portable Amp)
[size=10.5pt]Up to 2500mW into 32[/size][size=10.5pt]Ω[/size]
[size=10.5pt]Ibasso P4[/size] (portable Amp)
Output power: 600mW into 32
NFB12 (Desktop Amp/Dac)
[size=10pt]3500mW/25 ohm
1800mW/50 ohm
900mW/100 ohm
300mW/300 ohm
150mW/600 ohm[/size]
Yulong D100 (Desktop Amp/Dac)
900mW at 32Ohm
130mW at 300Ohm
E9 (Desktop Amp)
1000mW (16Ω)
80mW (600Ω)
But everyone I pm tells me their amp/source has more than enough juice! While they're probably all right, I'm trying to find some concrete grounds for comparing the output power of various amps into a 70 ohm headphone. But really, I want to know a formula that will help me do this for any impedance headphone, whether 32, 70, 80 or 300? Perhaps, there are too many variables to to this well, especially with some amps having different gains. But amp manufactures often list their mW at different ohms; some at 16, some at 32, some at 300. It's not standardized.
Is there a formula that lets me figure out how many mW each gives at a certain impedance? In my case this time, its 70ohms. But I'm just as curious at 80 ohms, 300 ohms, etc.
I don't know that this is actually valuable, for myself or anyone else. I'm not saying it sounds good. And I don't know what other variables I need to know. But I'm obsessed now, and I can't go back until I have an answer!
Here are some of those I've compiled:
UDAC and UDAC 2 (Portable Amp/Dac)
Power output: 80mW @ 16-Ohm
Fiio E5 (Portable Amp)
Output Power: 100mW (32ohms ); 18mW (300ohms )
Fiio E7 (Portable Amp/Dac)
Output Power: 150mW (16Ω); 16mW (300Ω)
[size=10.5pt]Ibasso D2 (Portable Amp/Dac)[/size]
[size=10.5pt]Output power[/size][size=10.5pt]:[/size][size=10.5pt]Up to 100mW into 32[/size][size=10.5pt] Ω[/size]
[size=10pt]Ibasso D4 (Portable Amp/Dac)[/size]
[size=10.5pt]Up to 230mW into 32[/size][size=10.5pt] Ω[/size]
[size=10.5pt]Ibasso D6 (Portable Amp/Dac)[/size]
Output power:Up to 650mW into 32Ω
[size=10.5pt]Soundmagic A10 (Portable Amp)[/size]
Maximum Output Power : 70mW (33Ω)
E11 (Portable Amp)
57mW into 250Ohm (From quote from E11 Thread)
[size=10.5pt]Ibasso T3D[/size]
[size=10.5pt]120mW [/size](into 32? I'm guessing)
[size=10.5pt]Ibasso PB1[/size] (Portable Amp)
[size=10.5pt]1400mW into 32[/size][size=10.5pt]Ω[/size]
[size=10.5pt]Ibasso PB2[/size] (Portable Amp)
[size=10.5pt]Up to 2500mW into 32[/size][size=10.5pt]Ω[/size]
[size=10.5pt]Ibasso P4[/size] (portable Amp)
Output power: 600mW into 32
NFB12 (Desktop Amp/Dac)
[size=10pt]3500mW/25 ohm
1800mW/50 ohm
900mW/100 ohm
300mW/300 ohm
150mW/600 ohm[/size]
Yulong D100 (Desktop Amp/Dac)
900mW at 32Ohm
130mW at 300Ohm
E9 (Desktop Amp)
1000mW (16Ω)
80mW (600Ω)