i got the thunderpants t50rp the hd650 and the denon d5000
what is the best amp under 300$ that can run them great ,
Can you please further elaborate what you mean by "avoid the E9s output impedance"? I do have the D5000 and the E7 and was thinking about the E9 on top to drive them properly....would the E9 influence the SQ in a negative way if using the D5000s?
Schiit Asgard would have to be a contender, especially since you're in the USA.
Over here it's considered to be a winner for $330AUD, even better is that you pay less.
Schiit do not publish the output impedance to the best of my knowledge.
I would pick the Fiio E7 and E9 combo over the other amps.
The gist of the deal with output impedance is that a high output impedance changes the frequency response of the headphones. Basically, makes them sound different, not necessarily in a good way. The E9 is powerful as far as headphone amps go, but it outputs at a high impedance. The E7 outputs at a much lower impedance and would match low impedance headphones better than the E9.
The E9 has an output impedance of 10 ohm... there is a rule of thumb called the 8 times rule - you don't generally want an output impedance higher than 1/8th of your headphone's... e.g. If you have 32 ohm headphones, you'd like your amp to only have a 4 ohm output impedance. If it has a 10 ohm impedance, you'd like your headphones to be over 80 ohms.
That allows for better electrical damping of the bass and more control (and better sound quality).