I've never used a capacitor before but I will definitely use them from now on. I bought it to try to fix my light dimming problem, which it did help a lot but not totally, but the difference in sound quality is amazing! It's powering my 4 channel and sub amp, 660 watts rms, and it's like a new system. Mids and highs are crisper and fuller and subs hit low and HARD now. A lot better then I ever thought 10w0v3's could. My buddy thought I got new subs and couldn't believe it was just bc of the capacitor. Highly recommended this product.