Well i've been listening to my new Anniversary Edition for nearly all day without any complaints. Something was majorly going wrong and everything sounded all harsh and fatiguing. Seriously if you heard it the way I did you won't like it. Not a dramatic difference, but enough for me to think something was off. No harshness at all now.
It makes complete sense now why removing the outer grill foam would make it even worse. I won't go there...but let's just say the Q701 with 65th pads is fine with no foam. Unless you have a slight issue with your setup like me. And no my ears were not tired or clogged up last night.
I still can't believe you guys can't hear any difference between removing the outer grills and foam.
Honestly for me it's easier than telling apart the ODAC and Modi. Now THAT was tough. The only difference is in the soundstaging/imaging with that. I will say that Chicolom is right and that the difference between no foam and with is very subtle (greater than 1%!), but the difference is much greater when you remove the grill etc. I guess it all has to do with how much air the Q701 and Anniversary gets. You can mess with the foam near the driver itself and get similar results!
I listened to the Anniversary (Q701 with Anniversary pads) all day with a ton of minor changes and all of it makes total sense really if you've done any modding.
Here are some things i've noted:
(feel free to skip it if you think it's placebo. I don't care)
DISCLAIMER: These probably don't apply to the q701 with stock pads.
no outer grill (completely open):
more low-bass and treble. Smoother (less forward) mids. Reduced mid-bass. Strangely with all that treble it doesn't sound that clear.
outer grill installed, no foam:
slightly less treble than before, more forward mids, more mid-bass and warmth. Definitely fuller sounding! Pretty smooth and clear.
closed off outer grill:
Mids crystal clear sounding (you'll notice this immediately and before anything else), but upper mids are harsh. Very good bass and like a closed headphone! This has the best (and most) bass.
I wish I could make it sounds exactly like this but remove the nasty upper mid harshness.
Outer grill with foam:
Nearly as good as the above, but smoother upper mids a little less mid-bass. Nice and full sounding, but not as clear.
Best configuration:
Outer grill, no foam (doesn't apply to stock Q701!).
Results
More air:
More low-bass and treble. Less warmth and mid-bass. Duh. Less forward upper mids (this part is totally opposite of what I expected).
Less Air:
More mid-bass and warmth, reduced treble, but harsher and more forward upper mids.
BTW what I love is how the completely closed off Anniversary sounds like it has the bass of my DJ100! I want to mod it in this configuration to make the mids much smoother. Then it'd would just be amazing sounding to me. I mean even more so.
I'll make sure to go back and edit some older comments if needed. Again, not a major change, but a LOT smoother. Still think it's about a 5% increase in bass (I measured this with a ruler). I wouldn't be surprised if some couldn't hear a difference. To my ears it's a smaller difference than the Q701 vs K702. It's really not that much warmer or fuller sounding to me. Barely audible.
If I upgraded my Q701 that I loved to a $400 Anniversary and couldn't return it i'd be pi**ed! I might say it's worth a $73 upgrade, but barely. Now I know nobody would agree.
EDIT:
The more I listen to the Q701 with anniversary pads, the more it reminds me of my TBSE/DJ100 (very well amped). This is PERFECT! As you know I'm one of those nuts who thinks the $55 TBSE sounds better than the HD-650/Q701. If you close off the Annie's grill it has about 3% (I used a calculator for that) less mid-bass than the TBSE. TBSE has way more low-bass since well..it's closed.
I'm glad this Anniversary is now sounding like you're all hearing it and not like a shouty piece of crap with no treble.
EDIT 500:
I think i've gotten the bass is be 100% as good as my favorite closed headphone except for it's low bass.
Try my Placebo Mod[size=125%]™:[/size]
Cover up the top half of the outer (inner) grill with something. Use tape and make it less sticky with your fingers if needed. Don't think about it and just do it. Listen to it for at least an hour, especially in bassy songs and tell me what you think. I doubt anyone will do it.
No this isn't a joke.