Bumped and vented pole piece (on the back of the magnet). Can handle a true 200-300 rms power. Rubber souround. And good well made cheap sub. Sound Quality Average.

Pyramid been making these for over 10 years (well over year 1995) and never improved the product. Requires too large of a box to drop ultra low frequencies that I like.

If you’re on a budget, or don’t want to go too hi tech or power… than these will do. I’m no stranger to these. Every now and then (every since 1996) I run across some of these and surprisingly they sound ok. And can handle a little power (from a cheap quality company such as pyramid). That’s one of the reasons why I go with some of these because pyramid claims that they are made in u.s.a. And with so many new companies (mostly assembled in Korea & sold in the overhear usa ) I rather gamble with a product that’s been around for a while.

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It don't even matter... A lot of stuff has improved tremendously over the years… but I’m from the old school, and rather gamble on a product I’ve seen in action since 1995 or older. The market it too over flooded with affordable new Korea made products, with factious performance claims. But products that I can compared these too are too old and been out of production.