Greetings!

We recently purchased more than 12 pre-owned Toyota cars from a dealer-only auction. Though the engine quality is good but now, we are looking for its audio up-gradation. To attract our buyers, we are willing to update the audio system of the cars like we are going to add stereo systems both Apple and Android ones, good subwoofers and speakers etc. Especially, we are willing to attract clients who love powered subwoofers. In this regard, our team is depending upon these powered subs https://99carstereo.com/powered-car-subwoofers/ and shortlisted Rockville RWS12CA and Pioneer TS-WX1210A. Because these are good options if we would buy in bulk. What are your suggestions in this regard? What other subs we can consider?

Secondly, I am here to get more suggestions from you about the audio equipment. First of all, we are thinking to place used car audio gadgets. Do you think it would be a good idea? Secondly, do you think we would able to recover all the profits if we go with new audio equipment?

It would also great if you suggest reliable car audio brands.