Hi, I'm using foam earplugs right now, both for rehearsals and live shows. They are rated at 35 db, but sound very muffled. So I'm looking for better quality with a near flat attenuation. The custom molded ones seem to be very good, but they're only available up to 25 db and I don't know why. Has anyone seen filters with more than 30 db? Is there just no market for this or are the used filters just not capable of more attenuation? What are you guys using if you need more than 30 db? Thanks.