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OK guys... My 125i cans are now modified...
1) opened with hair dryer
2) cleaned off all remaining glue
3) punched 4 holes on each can
4) added 3/4 inch diameter felt furniture pad on metal center of each driver
5) added a strip of electrical tape around smaller half to hold the two halves together. Just makes them tights so I can easily reopen them... no glue yet.
6) using a pair pf Grado L-Cusions
The base is greater. Maybe a tad too boomy...a little more open with better soundstage... still evaluating.
Next step is some more work of the inside and replacement of the outside plastic screen and button. Questions...
1) Are we dampening the chamber or trying to absorb hi frequency reflections? Is seems that something like Dynamat would do the former. I have some that I had bought to dampen a turntable. It is a 12" square with removable paper on one side that exposes the sticky side. The other side has a heavy foil. Is that what some of you have used? If so, that would leave the foil facing the inside of the can. Now I've seen some of you line the inside with stick-on felt strips. It seems that would not dampen, but more likely absorb high frequencies. I'm not a sound engineer... just thinking out loud.
2) How do you remove the existing plastic screen on the outside of the cans? It is glued on the inside of the larger half. (the mesh that contains the button with the model number)
OK... the further adventures... This morning's work on the SR125i cans
1) opened them up again. (easy right now, no glue. I just have some electrical tape around the outside of the driver half for a friction fit of the two halves)
2) removed the (previously installed) felt furniture foot pad from the back of the driver's center.
3) replaced that felt pad with a round 3/4 inch diameter piece of Dynamat.
4) cut 3/8 inch wide strips of Dynamat and put those around the inside of both halves of the cans.
5) when assembled now the entire inside walls are covered with Dynamat.
6) removed the plastic outer screen and "model number" button.
7) cleaned up the inside where that screen was glued, using Dremel and sand paper.
8) replaced the screen with pieces of a wire mesh cut from a Hershey's Kiss can. Not sure of the material but it's a shiny metal.
9) actually the screen was replaced before sticking the Daynamat to the inside of the outer cups. The Dynamat is all that is holding the new screens in for now.
10) from all of my work to date, the paint was coming off the lettering on the outside of the cup.
11) so I simply buffed off the remaining paint with 400 grit sand paper and cleaned it up. the lettering is now simply black.
12) Still using the Grado L-Cusion ear pads.
All of the Dynamat seems to have tightened up the low end a little. I will stop all mods for now and spend several days evaluating what I have done. It's a shame that I do not have a stock pair of SR125i cans for comparison. There is still a chance that I will go back in and cover 2 of the 4 holes that I opened.