Amp to compressor coated or uncoated cable?

I've never seen an uncoated cable for musical aplications. But no, an "uncoated" cable (by which I am assuming you mean without an outer shield) between the amp and the cabinet would be dangerous. The signal going from the amp to the cab is enough to give you a good shock, and there's the danger of it shorting to something and then there goes your amp.

What I think the person or persons who incorrectly gave you this advice meant was:

- Use INSTRUMENT cable (the same as you would between the bass and amp) between the amp's effects loop and the rack compressor.

- Use SPEAKER cable (NOT, and I repeat NOT the same as instrument cable. This has a thicker gauge than instrument cable and is rated to withstand the higher power that flows through it to the cab.) between the amp and cab.

 

I think we just have a little bit of language barrier here. I think the advice the OP got is correct. Substitute the word "shielded" for "coated." Use shielded cables for bass to amp and in the effects loop (instrument cable) and use unshielded cable to connect from power to speakers (speaker cable).

Different words. Same meaning.

 

Yeah, unshielded cable is the choice for connecting speaker cabinets to amps. If your local guitar shop sells 1/4" cables that are specifically labeled as "speaker cable," then they're unshielded. The ends are usually much larger, and the cable is often a bit thicker than a regular instrument cable.

As for Speakon cables (the other kind of speaker cable), they're unshielded, and there's no way you can mix those up with 1/4" speaker cables - the plugs are completely different! Personally, I prefer using Speakon whenever possible, but if your Hartke cabs don't have Speakon jacks, then you'll have to stick to 1/4" speaker cables.