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<blockquote data-quote="Ales Dravinec" data-source="post: 27646" data-attributes="member: 11">Re: 2011 LAB / SFN EXPO / SMAART 2-day May 16-19 in MAAll drivers are &#039;real&#039; drivers, each separatelly powered by dedicated 3.3HP power amplifier (almost 10HP total).There is nothing &#039;bandpass&#039; about it. It&#039;s almost a textbook isobaric design.To simplify even further : From listeners and system designer&#039;s perspective it is plane ol&#039; front loaded, ported sub.Magic is, that this particular configuration DRAMATICALY reduces t.h.d. @ higher SPL, especially @ very low frequencies.JD21 &#039;corners&#039; well below 30Hz (-3dB) and reaches the neighborhood of 140dB SPL, so lower t.h.d. is a must (if you ask me)....Main reason for the design is me being an old fart now and I refuse to drag heavy stuff around. I needed a &#039;power dense&#039; SUB.I emphasized &#039;sub&#039; since I firmly believe that flat response down to 30Hz is a must. All ADRaudio subwoofer designs meet this criteria.</blockquote>

[QUOTE="Ales Dravinec, post: 27646, member: 11"] Re: 2011 LAB / SFN EXPO / SMAART 2-day May 16-19 in MA All drivers are 'real' drivers, each separatelly powered by dedicated 3.3HP power amplifier (almost 10HP total). There is nothing 'bandpass' about it. It's almost a textbook isobaric design. To simplify even further : From listeners and system designer's perspective it is plane ol' front loaded, ported sub. Magic is, that this particular configuration DRAMATICALY reduces t.h.d. @ higher SPL, especially @ very low frequencies. JD21 'corners' well below 30Hz (-3dB) and reaches the neighborhood of 140dB SPL, so lower t.h.d. is a must (if you ask me). . . . Main reason for the design is me being an old fart now and I refuse to drag heavy stuff around. I needed a 'power dense' SUB. I emphasized 'sub' since I firmly believe that flat response down to 30Hz is a must. All ADRaudio subwoofer designs meet this criteria. [/QUOTE]

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