Will this woofer be suitable for an underseat application on a BMW 540?

These 8" speakers are not subwoofers. If you send us a direct message, we have subwoofers made specifically for that application.

In the bottom left of the main image of the speakers you show some speaker wires with something attached underneath heat shrink. What is that?

James, those are high efficiency crossovers for the tweeters and woofers

what do you have to say about the item being a fake or knock off?

Woofers ect sells a lot of fake stuff, they sold me some knock off hertz Hsk XL components for $749 and when I called them with proof they where fake, they still charged me 20% to return them and made me pay for return shipping. They aren't authorized to sell hertz,audison,focal or morrell, so instead they peddle knock offs

how do these compare to the isu-200?

The ISU-200 is the newest revision of the IS series. The ISU's are tuned to play extra bass, where the original models focus more on mids and high's. Either way, they're all great speakers!

ISS-200 8" 80 Watt RMS 2-Way Component Speakers System

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