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<blockquote data-quote="brandon_s0854" data-source="post: 6931550" data-attributes="member: 623673"><p>I'm not a box guru, but have a basic idea of how these work. The volume doesn't sound bad, but with tuning at 46hz, you're going to have almost no ouput @ 55hz and above. Bandpass boxes filter output above the tuning point in the same way a traditionally-ported box filters output below the the tuning point; someone more experienced here can tell you why. It's not AS noticeable in a regular ported box because there's a lot of cabin gain below the tuning point of most boxes in most vehicles. However, there's very little cabin gain above 50hz in almost all vehicles. So with this box you're going to have almost no output above 55hz and a ton of output from probably 50 hz down. Again, I'm not an expert; just telling you how I understand the design. If I've given any bad information, I hope someone will point that out.</p><p></p><p>I'm also thinking about putting a 4th order in my vehicle with two HDC310's, but I've heard they're very difficult to get right. Hope everything works out for ya.</p></blockquote><p></p>
[QUOTE="brandon_s0854, post: 6931550, member: 623673"] I'm not a box guru, but have a basic idea of how these work. The volume doesn't sound bad, but with tuning at 46hz, you're going to have almost no ouput @ 55hz and above. Bandpass boxes filter output above the tuning point in the same way a traditionally-ported box filters output below the the tuning point; someone more experienced here can tell you why. It's not AS noticeable in a regular ported box because there's a lot of cabin gain below the tuning point of most boxes in most vehicles. However, there's very little cabin gain above 50hz in almost all vehicles. So with this box you're going to have almost no output above 55hz and a ton of output from probably 50 hz down. Again, I'm not an expert; just telling you how I understand the design. If I've given any bad information, I hope someone will point that out. I'm also thinking about putting a 4th order in my vehicle with two HDC310's, but I've heard they're very difficult to get right. Hope everything works out for ya. [/QUOTE]
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