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bee wrote: the dip at 125hz is a massive dip in terms of a kick cab, this area is were you need the kick to perform. regardless of what the rta says, this cab wont be able to play over 150hz. I would rather a peak at 125hz and eq out than have to add eq. The other down side is it only plays down to 60hz, making it not usable as a part of a small system. The other down side is this design is not very loud spl wise, making it very hard for this design to keep up with an 18" scoop..... play around with it in horn resp lev, at this point I would not even take this design to proto type stage build..... I no 4db down at 125hz don't seem to bad but its 8db down at 200hz on the rta also when simming in horn resp sim at 4pi in stacks of 4, this will give a better idea of how it will perform in a mono stack with scoops....
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tony.a.s.s. wrote: Now that x\o points have been mentioned, I would like to add the following.
I see a lot of people asking how high certain bass or upper bass cabs will go. I always assume that it's because they don't think the mid will go down low enough. My view has always been that you should try and keep the voice out of the Bass Bins. Bearing in mind that the human voice goes down to 100hz, it's hard anyway. Firstly, try to keep the fundamentals coming from one source instead of splitting them between two cabs, and secondly try to keep the x/o point as low as possible when using a folded horn for upper bass.
So basically, when making your mid cabs, make sure they respond low enough. In my own upper bass cabs, I go out at 120hz.
One other thing to remember, with a cab that is used for "kick", just try to imagine what the speaker is trying to do when attempting to jump out of the box, and at the same time reproduce the delicate mid frequencies. Mid signals aren't helped by the velocity that occurs when hitting it hard. Just a thought.
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