Read my update about the grilles above
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My reply to you was based on Conors (and my own) findings, that the fabric is the culprit, mentioned by Conor himself 
Chill mate.
I replied what I did reacting to a notification that I had been replied to. I had not read the posts that happened in the last 6 hours or so and had just woken up and am on my phone.
So, my bad. If it’s really just the fabric I’ll take that stuff off later, but I’m waiting for a fitted foam disc to arrive.
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Cool.
I’ve received loads of 5mm of acoustic foam, cut the ring to go underneath the metal grill - I feel that 5mm is too much (the foam is called (APAfilpren90/5). I felt that 3mm would be better so today I’ve spent 10 minutes on each ring with razor and halved it 
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Yeah, a lot apparently changed since I was last up. I read his post now so disregard what I said. I’m chill now, bro.
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I’m going to try to put an end to any worries about the magnetic properties of the grills by injecting some physics in here, which I’m sure everyone will love
The force on the membrane in the driver is ideally given by:
F = (current through membrane) * (length of wire) * (magnetic field from driver)
The magnetic field is permanent and designed to be parallel (strongest) where the wire in the membrane is. This dipole field from these magnets dies off as the distance cubed, that is to say, very quickly.
The grills being steel means that a magnetic field can be induced in them from the driver magnets. This magnetization field contributes to the overall field and hence, the field the membrane sees, but it also dies off as ~ the distance cubed from the grills.
You can then approximate a new force equation as:
F ~ (current through membrane) * (length of wire) * (magnetic field from driver + magnetized ‘grill’ field)
This is a passive change, so it will only increase the force on the membrane. Because it’s not changing in time there can’t be any frequency dependent effects.
Moreover, the magnitude of the field at the membrane from the permanent magnets is much much greater than the contribution of the magnetized ‘grill’ field would be. So the effect will be essentially zero.
If you look at the force equation, you can see that a change in magnetic field has the same effect as an increase in current, so putting a paramagnetic material next to the driver (as long as it’s not moving) is akin to turning the volume up on your amp. Although, you probably wouldn’t even be able to adjust the volume to that fine of a level….
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This is what I bought for the foam:
I figured the M1060 would have similar fitting foam. It’s taking forever for them to get here though so I figure that customs is spending a lot of time trying to find contraband in those small round foam discs.
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You are the hero we have been waiting for! Not even the Manufacturer nor the vendor gave enough shit to make one.
I’m referencing the Frequency Graph.
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Cheers for the response graph. I’m interested in that 4k spike. It seems like quite a whooper. Is this something that anyone has noticed causing harsh or piercing sounds? I’m looking to upgrade from my 400is and I’m looking forward to getting away from the 8k spike that those have and cause me some discomfort sometimes (only sometimes). I would be a little upset to still have a similar issue
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Sort of the same boat with my 4XX… too shrill in the highs for my ears.
Who can say the grills on the headphones - Sundara, Audeze - are magnetized?
Keep in mind that it’s 5dB scale
Trying this tonight 5mm foam…
Edit well that’s a quick not for me lol…the bass has no slam but probably as deep, mids are muddied and the soundstage diminished.
I think 5mm is too thick and stifles the driver, may be 2mm or 1mm is worth a try as they look boss when the grills are back on over the foam 
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Ah ha! That is some funny shit!
I wonder why the metal has to be removed, was it the magnetism or the airflow?
same over here. Because it would take few weeks to get 3mm foam delivered from China (no less than 5mm are available locally) I decided to use razor and cut it in half. Much better results, sound is not as muddy and congested (closed?) as with the 5mm sponge
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it was the airflow problem caused by the fabric glued to the grille, as observed by ConnorG and few others.
Metal grill cover is not an issue here.
So if you remove the stock foam and clean and fit something else it’s better? Try really light felt, worked wonders on my Takstar.
I think felt would be even worse, you really need something thin and breathable as much as possible.
The stock foam comes with 2 small rings, we are trying to fit one that covers whole “open” part and looks nice.
As for pads, I had some Brainwavz hybrid that I have left from Massdrop T-0x, but they were to shallow. I stuffed them with some wool, and OH MAN - this is it.
