Liz, I have done somework in theaters. Some older ones replaced nice altec or jbl systems for modern. The bass horns where removed now you have standard sytle pro subwoofers in most. These are run so hard most are in a constant state of damage. So your mostly listening to 1/2 blown woofers in many theaters. A few I know of have time frames for bass driver replacement in the 2 month range. Look for a THX or other claiming higher quality you will find better loudspeaker systems in these. Funny the old bass horns I pulled from theaters have drivers near 20-30-40 years old work fine the new stuff well...you find cooked voice coils or cones shreaded. After months.