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Message: <blockquote data-quote="PV Audio" data-source="post: 3733009" data-attributes="member: 554493">I may be wrong in this assumption, but it makes sense to me. I believe the word bandpass is derived or is directly related to passband, which is an area of the audio spectrum. In a filter circuit, you have a low pass and a high pass circuit. For 3-way designs, you add a bandpass filter which comprises the middle of the spectrum. This is called the passband, or area between your upper and lower limiting frequencies. It looks roughly like a plateau which rolls off very quickly at either end i.e.<img src="http://www.rjbaudio.com/AlpheusMkII/Alpheus%20MkII%20crossover%20response.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />The red is your highpass rolloff, green is the lowpass rolloff, and the blue hump is the bandpass rolloff, or passband for this particular filter.What a bandpass enclosure does is that it essentially chooses two frequencies to be tuned to (literally for a 6th order bandpass, but we'll keep it to 4th order), and the area, or passband, between those two frequencies is greatly enhanced or boosted, much like a ported enclosure. However, much UNLIKE a ported enclosure, the bandpass enclosure's frequency response is very narrow in comparison, which is why you generally only use the design on low frequency drivers where they only have a small bandwidth to cover. As such, they are very easy to design, but extremely difficult to design correctly. I know not of a single commercial bandpass box that is designed correctly, and they consequently get loud, but sound absolutely awful (akin to farting, as some put it). Hope that helped, but if not, just let me know or someone else correct me so you can get a better explanation. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif-Dave</blockquote>

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