Visit Monster European Store Proceed to Monster U.S. Site Visit Monster UK Store Visit Monster European Store
Get free shipping on purchases of $99 or more Shipping Schedule



A simple and inexpensive way to boost the performance of nearly any amplifier. Amps need lots of current and need it instantly. At loud volumes or on very loud passages, an amp may call for two and three times the peak current of the entire charging system. The factory didn't design battery and alternator aftermarket entertainment. The result can be dimming headlights. A Monster Stiffening Cap provides that instant power your amp needs to deliver music with wide dynamics and impact.

The Need for Speed, How Monster's No. 66 Porsche Won It All.