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Message: <blockquote data-quote="audioinformer" data-source="post: 6702424" data-attributes="member: 577879">Well, I understand what Kippel is saying in his test but, I don't fully agree. Here is why I say that, I have taken a subwoofer and tested the T/S parameters in an infinite baffle firing horizontal with an LMS with 1 watt of power with the mic 1 meter from the subwoofer. This was in an enclosed room with climate control, no noise and no air moving and got a Bl of 24.94086 Tm (the Vas was configured with a sealed enclosure for the Bl). Taking everything the same and firing the sub upward the Bl droped to 17.8562 Tm (the Vas was configured with a sealed enclosure for the Bl). The Bl dropped just short of 30% of the total value the subwoofer had firing a different direction.So Bl does not adjust is what you say but, just changing the direction the sub is firing during the T/S parameter test changes the Bl 30%. This by itself would mean the the sub was at full X-max firing up since it was 70% of the Bl it had as firing sideways both in a infinite baffle for the small parameters and a sealed enclosure for the Vas reading.My only point was you could not compare the RD Alpha with its X-coil parameter to the Sundown Nightshade with its X-max parameter for total displacement of the drivers to say that one 15" sundown nightshade is louder than a pair of 12" rd alphas.For the record, I really don't like either driver that much and think he could do better with something else but, that was not the question and I was only trying to help make your statement accurate. My opinion is if these are his choices, since they should be pretty close, I would go with which every sub company could and will help you more in the future. Customer service is more important than the sub itself because you should be able to build an enclosure that will take most of the advantage away or for a different setup.</blockquote>

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