[RamblinE]

I've got Q701's and K550s already that I bought after a channel on my K701 failed. I am only now just getting around to repairing them. 
 
This morning I snagged a K401 on eBay and I've been bidding on a pair of K240 Monitors. All of my headphones are post-Harman. What can I expect the pre-Harman cans to do differently? 

 

[PurpleAngel]

I have the AKG K240 600-Ohm monitor headphone and they do have a nice sound (good detail), as long as they are used with a decent headphone amplifier.
 
The foam in the headphones might be very old (rotting) and need replacing.
Foam that is used as a fish tank filter seems to be low cost and will do the job, just have to cut to size.

 

[RamblinE]

  I have the AKG K240 600-Ohm monitor headphone and they do have a nice sound (good detail), as long as they are used with a decent headphone amplifier.

 
I'm expecting my Headroom Micro Amp to have enough juice for this. The Yamaha R-S201 in our living room is a wildcard. I don't know if the headphone output is driven the old fashioned way, off of the amplifier, or if it's a separate opamp. 

 

[PurpleAngel]

  I'm expecting my Headroom Micro Amp to have enough juice for this. The Yamaha R-S201 in our living room is a wildcard. I don't know if the headphone output is driven the old fashioned way, off of the amplifier, or if it's a separate op-amp. 

 
For 600-Ohm headphones, the K240 monitors are not that had to drive.
Guess they are less power demanding then the 600-Ohm Beyers.