I made the new attenuation rings out of ovaltine lids today and so far my first impressions are VERY good. I’ve only listened to a few songs so far, but the treble and mids seem to be about the same as the first rings I made, or at least I haven’t noticed any chang yet, but the sub bass seems to be way up. I’ve been feeling the sub bass rumbles in my chest in songs like “Oh Mama” by Run the Jewels.
Here are some pictures with measurements if you want to try these for yourself.
These kinds of lids
Blue is the originals (about .4mm thick) and the brown is the ovaltine lid ( about .8mm thick)
100mm across
58mm tall
38mm wide