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Speaker/Power amp question

So Im thinking of building an extension cab for my MarkBass combo and I kind of have a two part question for anyone that can help. First, when it comes to wattage ratings on speakers would two drivers rated to 150w RMS be a total of 300w RMS if wired in the same cab? Or would it just be 150w total? As for the power amp question, what does "bridged" mean on a power amp with two sides. And why on some power amps can you not "Bridge" them at 4ohms? Sorry these questions may seem elementary but im diving into something I dont have much knowledge in yet. Thanks