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Originally Posted by ludoo /img/forum/go_quote.gif
dbel your latest SFIs are gorgeous. Care to tell us how you damped them?
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Thanks. I thought I had better post this before it slips my mind
Today was a little busy, making halloween costumes as well as casing up the bijou and making octal - noval adapters ( ps if someone is interested , I figured out a real simple method to do this )
The Pickerings were an inspiration from Yogi, he discovered them originally and bought the 2 different models. The 03A is the only one I would seriously consider as a fosterfone. The cups form a little like a deeper yamaha - vented by slots in the bottom and screw down front plate. Unfortunately the whole thing falls apart when you open it and the gold ring is in fact a separate part.
The first thing I did was do the standard primary damping on the SFI - remove the mesh, glue the thin dense felt to the magnet and then place reflex strips top and bottom followed by a thicker felt pad glued around the edges. I no longer have the ludo felt so I used thick wadding that is used to ship toxic chemicals - it is tightly woven very dense and very similar in nature to the felt ludo had sourced.
I placed a small disc of felt behind that again. The space around the SFI was filled with a porous foam in a ring , I used the green thinner felt to cover the entire back of the cup and then used a round pad of egg foam the size of the cup to hold it all together, nice 'n snug.
All parts of the cup were sealed together with bitumen "tape" used in speaker building. The SFI was also sealed to the front plate before it was all compressed together and screwed back together. ( bitumen tape is not unlike play doh - messy as hell but seals airtight.
As to sound - I really liked them. They were the least forward sounding SFI's I have made to date and have a bass that is strong and well articulated. The pads reduce the bass more than when I tried the flat pads but they are more comfortable and the improvement in soundstage was worth the loss of a little bass.
I would recommend them to anyone to try as a fosterfone.
This thread has been real busy today, I am no longer incredulous of smeggy's discoveries - voyage forth and lets hope this is like diarrhoea and it trickles down to the rest of us in time.
good find PDOT, let us know all the details and finally MPI , I wouldn't try the DT770's unless you wanted the harness. I have just sold a pair and those cups are just too huge to consider taming. There are many cheaper options out there. In fact I saw a pair of throw away cans in ROSS this weekend - called "ear damage" or something along those lines = $6 ; they looked like they would make a fine SFI transfer.
..dB
