[Moolok]

Hmm... Both PX 100-II and SR325is are 32 ohm and DT 770 pro is 250 ohm. On what position is the gain switch at the rear of the E09k? Pull it down for low impedance and high sensitivity headphones and up for high impedance and low sensivity. I keep it up for my 120 ohm K601 and 150 ohm HD330.

It's set to low already.

How about trying the up position? I keep it up with my E09k even when using low impedance cans...

 

[roguegeek]

How about trying the up position? I keep it up with my E09k even when using low impedance cans...

Tried. Didn't do anything but make it louder.

 

[Moolok]

How about trying the up position? I keep it up with my E09k even when using low impedance cans...

Tried. Didn't do anything but make it louder.

Ok, then I have nothing. Sorry I couldn't help further.

 

[roguegeek]

Ok, then I have nothing. Sorry I couldn't help further.

I appreciate all of it. 

 

[BillsonChang007]

Hello,

It is probably because of the damping factor. It is not ideal to use low impedance headphone with amp with high output impedance. Your headphone is 32Ohm at 1KHz. It is recommended to use headphone amp with output impedance lower than 4Ohm. The FiiO E07K itself have output impedance lower than 1 Ohm. I recommend you to use that for your low impedance headphone or headphone with impedance of lower than 80Ohm. Use the E09K for headphone with impedance higher than 80Ohm.

The reason why you do not find it a problem pairing your Grado with E09K mainly because the Grado have flat impedance vs frequency thus, IMO any output impedance would not affect it much.

Hope it helps,
Billson

 

[roguegeek]

This makes sense. Why would the Porta Pros sound ok, though?

 

[BillsonChang007]

http://graphs.headphone.com/graphCompare.php?graphType=7&graphID[]=1613&scale=30 
^ because it's impedance vs frequency is pretty flat except for the bump at the sub-bass
 
Billson 

 

[Moolok]

Hello,

It is probably because of the damping factor. It is not ideal to use low impedance headphone with amp with high output impedance. Your headphone is 32Ohm at 1KHz. It is recommended to use headphone amp with output impedance lower than 4Ohm. The FiiO E07K itself have output impedance lower than 1 Ohm. I recommend you to use that for your low impedance headphone or headphone with impedance of lower than 80Ohm. Use the E09K for headphone with impedance higher than 80Ohm.

The reason why you do not find it a problem pairing your Grado with E09K mainly because the Grado have flat impedance vs frequency thus, IMO any output impedance would not affect it much.

Hope it helps,
Billson

Oh, I see too. You live you learn something new

 

[BillsonChang007]

Oh, I see too. You live you learn something new

Haha that's really true! xD

Happy listening
Billson

 

[roguegeek]

This is super helpful. Thanks!

 

[BillsonChang007]

This is super helpful. Thanks!

Your welcome!

 

[p1nkFl0yd]

Hi everyone, 
 
I'm a new member. I have a concern about the E07K before buying it. The FiiO can perform as DAC and AMP at the same time, can't it?
What I mean is when I plug the E07K in to my laptop and set the E07K as the output device, then it will do the DAC job and then also amplify the sound, right?
 
Because I just heard that it can do either DAC or AMP. It cannot do both simultaneously. I think that's silly but since I a total noob, I want to confirm about this.
 
Thanks all !
 
Have a nice day!

 

[BillsonChang007]

It can do both on USB

 

[bowei006]

Like Billson said.

Plugging andes in through usb uses both DAC and amp. You have the option to only use the dac if you buy the L7 adapter. But ypu dont need to worry about that

 

[thug behram]

Gonna buy this to match with the Beyer DT770 32 ohm headphones. Source will be iPod classic and HP Laptop. Should I buy the e17 instead?