Optimus 1b

[Anders]

I had KLH 6's and sold them because I didn't like them much.
Highs rolled off above 10k.
I like my KLH 20's better.

[Mongojustpawn]

Here's a pic of the crossover. Capacitor is 15mf, 50v.

[Dicky]

Looks easy enough, just follow 8w's advice.

[Sir Thrift-a-Lot]

1.  Electrolytics are meant for use in DC circuits in which they work fine
2.  They have very high electrical leakage and poor transient response when compared to film caps
             (translation=they sound bad)
3.  If you look at the waveform through one on a scope you'll see how bad they perform for AC.
4.  Electrolytics don't last as long as films and is why tube amps need to be re-capped after a number of years.
5.  Tolerance for electrolytics is horrible, in the 20-40% range
6. A non polarized electrolytic is nothing more than two polarized electrolytics wired back to back in a single package.

Only reasons to use them is that they are cheap and when sound quality is not important.

I appreciate all of that info.   The one thing you didn't answer is "Weren't the original caps in most of the old Pioneers and Sansuis NPEs?"

[Sir Thrift-a-Lot]

Is that an NPE in Mongo's pic above?

[rgpit]

I appreciate all of that info.   The one thing you didn't answer is "Weren't the original caps in most of the old Pioneers and Sansuis NPEs?"

Didn't answer cuz I don't know. It wouldn't surprise me if they were NPEs in the old Japanese speakers.

Also, yes that is an NPE in the picture.

[Sir Thrift-a-Lot]

Thanks.

One more newbie question.   I assume that the film caps aren't listed as "polar" or "non-polar" because all film caps are non-polar.   Is this correct?   I don't want to order the wrong thing.

[SunnyDaze]

Film and foil caps and metalized film caps are both non-polar.

[Sir Thrift-a-Lot]

Is a "metallized polypropylene" a film or foil cap?   tubesandmore.com has some great prices on some Solens.

[SunnyDaze]

Is a "metallized polypropylene" a film or foil cap?   tubesandmore.com has some great prices on some Solens.

http://vintagehifipgh.com/forum/index.php?topic=3091.msg29969#msg29969

[Mongojustpawn]

http://www.parts-express.com/15uf-100v-electrolytic-non-polarized-crossover-capacitor--027-344

Ordered these cheapie caps.

[SunnyDaze]

You should at least go with these, man: http://www.parts-express.com/dayton-audio-dmpc-15-15uf-250v-polypropylene-capacitor--027-432

[Mongojustpawn]

Didn't see those, I'll check again.

[Sir Thrift-a-Lot]

I recap give away speakers with the NPEs.   I've been convinced to use the better caps in my "keepers".

[Sir Thrift-a-Lot]

At that value, the Audyn's are even a few cents cheaper than the house brand...

http://www.parts-express.com/audyn-cap-q4-15uf-400v-mkp-metalized-polypropylene-foil-crossover-capacitor--027-119