IMF CM3

[doktor bob]

A gift, (thank you Lucien) .one mid unit is nog working .The plan is to get them in perfect working condition

 

[doktor bob]

The broken mid unit is the ELAC 4/200 .the coil measurs infinety.

 

[doktor bob]

The tweeter

 

[doktor bob]

The woofer

 

[doktor bob]

Filter

 

[doktor bob]

The filter schematic (measurd value condensators incidentally)

 

[doktor bob]

Clean and oil the cabinets

 

[planet10]

K040 looks in sad shape, few have survived.

dave

 

[doktor bob]

 

[doktor bob]

The upgraded fiter , R2 is added to bring the new monagor MSH-115 5,5db @1kc down (reletive to 100hz meauserd on the woofer).
R2, R3 ,R5 en the chance of R4 from 3R3 to 5R6 bring the tweeter 8db down @6kc (again relative to 100hz at the woofer)

 

[doktor bob]

 

[doktor bob]

The end result