Need help with Kenwood KL-888D

[doomfreak182]

I have a set of four Kenwood KL-888D Quadraphonic speaker cabinets. They are in excellent condition except one which has a blown out midrange (well it doesn't work very well), I am having a very difficult time finding a replacement. I checked the internal circuitry (not very intricate) and it looks fine, capacitors fine no swelling, no corrosion, soldered joints looking healthy. The specifications of this speaker are listed below:

Manufacturer: I want to say Kenwood makes this but it says TRIO on the speaker and Kenwood just might manufacture the cabinet.
Model #: T06-0052-05
Max. 60 watts
Nom. 25 watts
resistance rating: 8 Ohms
and then it says Japan underneath it all

I am getting a Pioneer SX-3700 from my father to replace a Sansui AU-D5 that was used to drive this set. The cabinet speaker was bad when I got the set , however the rest of the set including the rest of that cabinet and the wood are in perfect condition and clean too. I am guessing these were made in 1974 or around that time? I love these things and appreciate help. I want to be the cool guy on the block again with the kickass stereo (idk the term for quadrophonic I will call it stereo anyway) haha! Thank you all in advance for any help I recieve!