cts 4.5 Info anyone?

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I found some bose 901 DIY clones while on vacation. Not worth keeping as a speaker but there are 18 4.5" drivers inside.

Once I got over the strangeness of all that sound being sprayed in every direction the drivers started to sound pretty good. When I lifted the
over-stapled grill cloth from infront of one driver it looked to be in pristine condition.

Can anyone tell me about them. If I sell them, can someone suggest a price/driver?

Here's the info on the back:

CTS 4.5 sr10-b
135 7431

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