DT667 has a set of Electrohome bookshelf speakers that feature Japanese-made Morse alnico magnet drivers that were "borrowed" from an elderly neighbor years ago. He never asked for them back again, so DT667 began to investigate upgrading components inside the speaker.
Upon removing the drivers, DT667 discovered that the single 5uF crossover cap on the + of the tweeter , a cheap non-polar electrolytic, was not even soldered in place.
The speaker connection on the back was a female RCA jack.
The stock wires were cheap super thin AWG cheap stranded copper.
For the upgrades, 5 way binding posts were mounted on a square of lexan and secured on the back of the cabinet with wood screws.
Dayton Audio 5.1uF film + .01uF Russian K40Y oil cap in parallel were used as a 1st order high pass filter on the tweeter. The woofer runs full range. Both are paper wizzer cone types with Alnico magnets.
The internal wiring was replaced by KnuKonceptz Kord 10AWG OFC speaker wire.
Probably would have been wiser to go with 16AWG because DT667's soldering iron was not high enough wattage to heat and tin the 10AWG properly. Snipping back the ends of the wires until they matched the diameter of a 16AWG wire before tinning and soldering to the speaker tabs was required. Heat shrink tubing covered the solder joints.
DT667 created (2) speaker cables from the 10AWG wire to Fulton derived lengths - multiples of 57.125" and connected those to his updated Electrohome speakers and PASS Camp Amp clone for some subjective listening. Not too bad on various Qobuz hi-rez streams.
DT667 might add an inductor on the woofer as a 1st order low pass filter but this is not a critical mission the Morse bookshelf speakers are not primary or secondary system speakers.