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<blockquote data-quote="helotaxi" data-source="post: 2668141" data-attributes="member: 550915">What tuning works depends entirely on the sub.&nbsp; No generic answer such as &quot;tune to 28hz for SQ&quot; has any sort of merit.&nbsp; What constitutes &quot;high&quot; or &quot;low&quot; tuning is relative to the sub.For each driver there is an &quot;optimal&quot; tuning that will result in the flatest response outside the car.&nbsp; Figure in the car interaction (which can be measured if you really care) and you typically have an emphasized lower end compared to a sealed box.&nbsp; This isnt necessarily bad as the ear is less sensitive to lower freqs anyway.&nbsp; If you don&#039;t listen to music that makes use of the lower freqs then the extra bottom end isn&#039;t needed.&nbsp; Now take the same sub and same volume box and tune it higher (even 4 Hz) and you will get less low end extension and will get a hump in the response right round the tuning freq.&nbsp; Add in the car interaction and you get that range of frequencies very much exagerated.&nbsp; That hump is what defines what many people call an SQL enclosure.&nbsp; Make the box bigger from there and that hump becomes more exagerated.&nbsp; The extreme result is a really narrow really loud peak and an SPL enclosure.&nbsp; The sub is usually nowhere near under control at other than at that freq and does nothing but play that one note really loud.To suit your needs, a sealed box with a Q between .8 and .9 will yield very good in-car results.&nbsp; The natural roll off of the box below resonance couples very well with the cabin gain from the car and makes for a smooth response.&nbsp; There will be a small, broad hump right around resonance which usually falls right in line with the freq of the fundamental of a kick drum and is not overbearing.&nbsp; The sound is better than that of a mistuned ported box and in the upper bass range, you will actually gain some output over a ported box.</blockquote>

[QUOTE="helotaxi, post: 2668141, member: 550915"] What tuning works depends entirely on the sub. No generic answer such as "tune to 28hz for SQ" has any sort of merit. What constitutes "high" or "low" tuning is relative to the sub. For each driver there is an "optimal" tuning that will result in the flatest response outside the car. Figure in the car interaction (which can be measured if you really care) and you typically have an emphasized lower end compared to a sealed box. This isnt necessarily bad as the ear is less sensitive to lower freqs anyway. If you don't listen to music that makes use of the lower freqs then the extra bottom end isn't needed. Now take the same sub and same volume box and tune it higher (even 4 Hz) and you will get less low end extension and will get a hump in the response right round the tuning freq. Add in the car interaction and you get that range of frequencies very much exagerated. That hump is what defines what many people call an SQL enclosure. Make the box bigger from there and that hump becomes more exagerated. The extreme result is a really narrow really loud peak and an SPL enclosure. The sub is usually nowhere near under control at other than at that freq and does nothing but play that one note really loud. To suit your needs, a sealed box with a Q between .8 and .9 will yield very good in-car results. The natural roll off of the box below resonance couples very well with the cabin gain from the car and makes for a smooth response. There will be a small, broad hump right around resonance which usually falls right in line with the freq of the fundamental of a kick drum and is not overbearing. The sound is better than that of a mistuned ported box and in the upper bass range, you will actually gain some output over a ported box. [/QUOTE]

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