When cranked to the max, the system literally rocks the house. The neighbors have complained. The kids clamp their hands over their ears. Wifey thinks it’s juvenile to listen to music at such volumes.

But I’m in headbanger heaven. The system puts out 115 decibels, according to the specs. OSHA recommends ear protection if exposed to such noise levels for more than 15 minutes.

In fact, the Z-5500 goes to 11. No kidding. When you reach the top of the volume dial, keep turning. The system goes into a boost mode, numbered 1 to 11.

It’s an undocumented feature; a little Easter egg for juvenile fans of loud music — like me.

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For a music nut like me, the Z-5500 is a delightful product: a source of genuine teenage kicks. It rivals, maybe even trumps, the joy of the iPod. After all, what can beat sharing some thumping, late-night techno with a few of your closest neighbors?