From
[Link: communities.leviton.com]:
FT4 and FT6 are Canadian fire code standards related to the fire and smoke retardancy characteristics of communications cable.
Is this what we're talking about?
I'm just guessing, then. FT4 and FT6 seems to be specs for wire. Are you asking for brands and model numbers?
Your profile gives us no information to be able to mix with your question to make more sense of it and help you out.
Me, I use XLR and 1/4" connectors for microphones and some headphones. The wire I'd run for them varies, depending on signal levels and usage. But none of the things I know about include the names FT4 and FT6.