Eminent LFT-8b Diaphragm Replacement

TWEETER DIAPHRAGM REPLACEMENT FOR THE LFT-8b

Revised 10/26/2007

Remove the tweeter driver completely from the speaker frame.  Disconnect the 

black tweeter wire spade lug from the barrier terminal block and detach the white tweeter 

wire from the mid-range terminal board using a soldering iron.  Remove the eight 

machine screws, nuts and spacers.  Keep track of each spacer location so that it can be 

returned to that same position upon re-assembly.  Place the tweeter driver on a smooth, 

clean surface with its front assembly, facing down.  Remove four 10-32 machine screws 

from one end of the tweeter driver assembly.  Pull apart the back magnet assembly from 

the front (approx. 1”) at this end.  Continue pulling apart the channels while removing the 

next three pairs of screws, taking care not to allow the front and back channels to slap 

together.  Loosen the remaining screw at the end and pivot the top channel clear of the 

bottom channel at right angles from each other.  Remove the screw and separate the two 

halves.

Replacing The Tweeter Diaphragm

Remove the old diaphragm along with the underlying double-sided tape on both 

rows of magnets from “front” channel making sure the rubber insulator squares stay 

intact.  Please note placement and location of the diaphragm before removal, as to 

reference the location for the replacement diaphragm.  Check for and remove any 

magnet fragments from the front and back channels.  Place the new tweeter diaphragm on 

a hard top table with the terminal board facing down and aluminum conductor facing up. 

Tape the non-terminal end of the diaphragm to the table using ½” wide invisible (office) 

tape.  Tension and tape the other end of the diaphragm just above the terminal board 

using a 3” piece of invisible tape.  Make sure the diaphragm is flush with the table with 

no wrinkles or creases above the terminal board.  Place an 18 ¾” piece of ½” wide 

double-sided tape on the outer three conductor ribbons of the diaphragm, starting at the 

non-terminal end and ending around 4 ½” from the terminal board.  Cover the final 3” of 

conductor ribbons, including the terminated leads, with invisible tape.  Carefully remove 

the diaphragm for the table and place the diaphragm by first attaching the non-terminal 

end flush with either end of the front channel assembly.  Next, tension the diaphragm and 

align the conductors with the channel while pushing the diaphragm onto the magnets 

making sure the diaphragm is flat between the magnet channels as you go.  The 

diaphragm should resemble Diagram (A).  Fold and tape the over-hanging terminal end 

of the diaphragm as illustrated in Diagram (B).