2 way bookshelf speakers based on an Optimus Pro77 set from a thrift store. The original woofer surrounds were shot and bought replacements from Parts Express to restore them. Ended up also replacing the metal cases new plywood boxes.
Replace the woofer in a set of older speakers I picked up for $5.
After realizing the replacement drivers would not fit in the metal box fronts, building simple new wood cases was my decision. Wanted to see if I could make this set work again with little investment.
WP-5211 5-1/4″ Poly Cone Foam Surround Woofer Pair 8 Ohms 299-2238 factory buyout
Optimus Tweeter Sd-72
1/2 MDO plywood boxes.
Inner dimension 8.25″ h x 5.25″ w x 4.5″ d
No port yet, maybe in the future…
Glued and brad nailed cases with poly-fill stuffing. Drivers are flush mount and screwed. Silicon caulked the tweeter plate to the face.
Used the original Optimus Pro 77 crossover which has
4.7uf 50V bi-polar electrolytic caps in series with the coil/tweeters,with the 0.4mH coil in parallel with the tweeter
Tips & Tricks:
Use a router circle plate such as the Jasper for the driver cut-outs!
saves hours of time in the end for $30.
Total investment of $25 and 5 hours of time.
Sound is clean strong and will give years more music
About the Designer:
Architect/fabricator and music lover
Project Parts List:
|WP-5211 5-1/4″ Poly Cone Foam Surround Woofer Pair 8 Ohms|