Hi @mylesparlee1 ,
Thanks for your inquiry. Film might be a good choice.
Click here for another great resource regarding Capacitors.
Below are some capacitor options that might be what you need, please review datasheet specifications:
Click here for 338-3441-ND | P12250-ND | 399-F43MN3500ZA01K-ND
Non-polarized/bipolar electrolytics are far more rare, and these would need to be on the pre-amp side (not at the speaker) since they have very low current rating. Click here for 493-10845-1-ND | 493-12708-1-ND | 493-12735-1-ND | 493-14986-ND