Attn: Speaker DIY expert

A resistor-tip: to make a good free-flowing resistor you can use lets say 4x32ohm in paralell to gert 8ohm aso. This reduces filter-resistance, the main reason for dynamic loss in passiove filters. Allmost any cheap resistor will do. Components in paralell are the worst dynanic-killers, but this trick lifts the filters power-capasity a lot.

You can do the same with caps in the lower section; only that here the values are added. Like 3x33uF makes a faster 100uf.

For top-caps I`ve used Intertechnic SCR tinfoil. Needs a few months to open up but then they dissapear totally. Not too overpriced ;)

Metallized PolyPropylene(MKP)caps are good. Solen for one and many others are MKP and you pay for their name. You can get cheaper (noname) MKPs at various places. RS might have them.

" For top-caps I`ve used Intertechnic SCR tinfoil. Needs a few months to open up but then they dissapear totally. Not too overpriced ;)"

Sleepy head, here I`m doing a tragic mixup. My long time favorit top-end cap is the Intertechnic KP-SN tinnfoil.Just invisible, perfect and just a little pricy.

But a warning; the worst polypropylene caps I`ve ever heard are called SCR; black w. orange ends. Even if someone give them to you, don't use them.

http://www.elfa.se/elfa-bin/setpage.pl?http://www.elfa.se/elfa-bin/dyndok.pl?dok=2012665.htm

For lower freqences I`ve used the 600V version of Solen MKP. To improve the flow-capasity I run three of them in paralell, like 3x33uf to get 100uf. Combined with thick solid-core wiring this gives a horsekicking free sound.

Ceramic wirewound resistors (non-inductive type) and polypropelene caps (double layer film) and air core inductors (mounted with brass of course) - appropriately rated - these get my vote. Practical and relatively inexpensive (generally a few dollars each).

Elctroid is right on. I would not replace the inductors, unless you can account for DCR change, and can measure both old and new inductors yourself. If the Rat Shack inductoirs are really bad, I suppose if you stick to the same wire gauge and just upgrade the inductor to solen you would be OK.Maybe you could ask the original designer.

I would avoid foil inductors also as they are a bear to solder, unless you know how to do this. I think Sonicap will make the cap values you need, and Mills are 1 percent tolerance. Make sure you have enough room for the new parts.