[LukaTCE]

Hi what amp would be cheapest to drive DT 770 250 Ohm ? I prefer portable as for TV and phone but mostly used on PC. On some topic I seen it need 260mW to drive it properly ? I don't need much volume. HD 598 are good at 25 volume but they are 32 Ohm and open. I would also need DAC probably for phone
Or any other headphones if you got any suggestions I like DT 770 because of good noise isolation (30-35dB ?) HD 598 is too open and I hear everything from outside as it don't block any sound from outside.
TOPPING NX1a is 30€ but it says it's only 100mW
Biggermouth A2 $30 860mW but says load impedance is 2K Ohm so how do this impact on headphones and battery ?
I see SMSL m2/mini are $50 with 130+130mW what this means ?
Fiio A3 is 60€ 200mW
SMSL sApII Pro 1000mW at 32Ohm seems powerful but it's not portable. I will use it mostly at PC,TV so portable is a plus.
 
I am wondering about response. It have any impact on headphones as this cheap amps have only 20-20Khz-30Khz response and DT 770 have 5-35Khz

Used DT 770 250 Ohms are 80€ (owner says it's used only for 3 "radio interviews" While new DT 770 80Ohm and 250Ohm is 135€ So probably used is best deal as headphones are durable. I am not sure about warranty Is there a lot of chance speaker die ? as they are quality headphones. I would pick 80Ohm but ppl on forum are saying it have heavier bass.
 
Or is better to put more money for headphones like Beyerdynamic Custom Studio they are 180€ 80 Ohm ("DT 770 speakers and bass control")
 
I guess used DT 770 250 is worth 80€ then and $30 for amp

I don't see anyone on this forum have tried Biggermouth A2/A4 it seems cheap quality I guess
http://www.ebay.com/itm/Biggermouth-A2-Class-A-Portable-Headphone-HiFi-Amplifier-9V-950mA-USB-Charge-/400963863740?hash=item5d5b4f04bc:gqUAAOSwgZ1XrDiv
 
Thanks,
Luka

 

[kimvictor]

Honestly, don't worry too much about the power rating unless it's uselessly low(below 200mw). That being said, I haven't tried the amps you've listed, so I can't comment on the specifics, but few general tips.
 
I think by load impedance, you mean input impedance. Input impedance can be high(and should be). Unless you want to get really technical, having high input impedance won't affect how a budget amp will sound.
 
The 130+130mw should mean 130mw per channel, unless otherwise specified. That means 260mw total output.
 
Simply ignore the response range, unless it's super weird. Firstly, you won't hear anything about 20k, and secondly, even regular lossless files don't output anything above 20k. Same goes for super low frequencies. Most amps do have a roll off, but manufacturers rarely post accurate information about response range(like SE535, which claims 19k). 20-20k is a very fair range.