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<blockquote data-quote="Ales Dravinec" data-source="post: 49465" data-attributes="member: 11">Re: Need subs that will do 20hz-40hzJD 21 will &#039;do&#039; 29Hz @ -3dB. Since its maximum SPL borders 140dB within the passband, it would mean at least 135dB @ 29Hz ...If special requirements dictate usable audio @ 20Hz &#039;in level&#039;, the overall SPL rating after equalization will drop to 120dB range ... probably lower, since excursion becomes a limiting factor. Considering all the facts, OP should seek subwoofer &#039;tuned&#039; @ 25Hz or lower (ported box), or some other solution ... maybe a band-pass of some sort ...JD 21 is not yet listed on ADRaudio website because some additional changes are being applied to the box (nothing major).with respectP.s.: I hate to manipulate with &#039;unofficial&#039; TF plots in order to maintain credibility ... However, Bennett&#039;s got some from the field which he may want to post.</blockquote>

[QUOTE="Ales Dravinec, post: 49465, member: 11"] Re: Need subs that will do 20hz-40hz JD 21 will 'do' 29Hz @ -3dB. Since its maximum SPL borders 140dB within the passband, it would mean at least 135dB @ 29Hz ... If special requirements dictate usable audio @ 20Hz 'in level', the overall SPL rating after equalization will drop to 120dB range ... probably lower, since excursion becomes a limiting factor. Considering all the facts, OP should seek subwoofer 'tuned' @ 25Hz or lower (ported box), or some other solution ... maybe a band-pass of some sort ... JD 21 is not yet listed on ADRaudio website because some additional changes are being applied to the box (nothing major). with respect P.s.: I hate to manipulate with 'unofficial' TF plots in order to maintain credibility ... However, Bennett's got some from the field which he may want to post. [/QUOTE]

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