Every Stage One is 100% BAVSOUND exclusive, and uses our proprietary, vehicle specific speakers. They’re designed for your exact model and application, and available exclusively through BAVSOUND. Making a comparison between the speakers that make up our BAVSOUND Stage One kits to off-the-shelf speaker pairs is like comparing apples to oranges. First and foremost, off-the-shelf parts just plain don't fit in most cases without modifying the vehicle or the speakers. Our speakers are always a direct fit in your BMW, with no modifications to your BMW required. Ever. Second, aftermarket speakers are designed to be used with an aftermarket amp, and have "standard" impedance profiles and efficiency. If you're planning to use them with your factory amplifier, odds are they won't sound very good. That's because BMW, in most cases, uses non-standard impedances and very high efficiency speakers. When installing aftermarket speakers with your factory amp, generally they won't present the correct impedance to the amplifier, leading to imbalanced output (some frequencies too loud, others too quiet), not to mention possible damage to your factory amplifier. BAVSOUND speakers are always correctly impedance and efficiency matched to work in perfect harmony with the rest of the factory audio system and ensuring the continued excellent performance of your factory amplifier and/or head unit. All of that said, when comparing the actual speaker design and how our speakers sound in real world use compared to many, many aftermarket brands, they are, quite simply, exceptional when compared to most aftermarket speakers offered at similar price points. The reason is simple: we're able to use better materials and speaker designs at the same price point because we don't sell through traditional retail channels with 4-5 middlemen. Instead we buy from our factory and sell to you, and that means more speaker for your money. So in the end, there really isn't a comparison.