There is no reason for you to be able to “hear” the Word of God. The readings are in the Daily Missal and you can follow along in the Missal or in your Bible.
Much of the rest of the mass is responses and prayers, and we Catholics know these responses by heart. We don’t need a sound system to pray them. And for those who don’t know them, they’re also in the missal.
As for the homily, yes, it’s a shame to not be able to hear it. Sit closer. Or talk to the priest afterwards and ask if he can summarize his homily.
Please keep in mind that the mass is not a “teaching time.” It is one long prayer. It is worship of God.
Also remember that a good sound system is extremely expensive, and in many older churches, it costs even more because of the extensive re-wiring needed. I think many churches often have to spend their money on other more urgent priorities.
I’m sure they would welcome a financial gift to pay for a new sound system. But as I said above, it’s not necessary, since the mass readings are in the missal and people are supposed to be studying them before they even come to mass.
Don’t try to compare Catholic mass with Protestant worship service. They are NOT the same. It would be more accurate to compare Protestant worship service with Catholic Bible study.