The metal grills interfering with the driver’s magnetism seems like a flaw or oversight and the discussion has gone that way. Connor G makes it sound like they took his finding seriously. If they do change them in future units it means the manufacturer acknowledges the grills as an issue.
I didn’t call for the units to be replaced, I was suggesting sending out replacement grills upon request if that is indeed an issue that they will have fixed for the next batch.
I also didn’t say anything knocking the stock sound quality. I have praised them multiple times in this thread and I myself haven’t taken off the grills yet, since I have nothing to replace them with as of yet.
What I suggested is just a good PR move they could do as a fledgeling company. I don’t expect them to do it. Calling this an issue or saying it seems like one is not calling them trash, they can be excellent and still have an issue.
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.
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
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….
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.
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
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
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
