Thank you. The application is a sub woofer as small as possible and a good replacement part for repair or upgrade of present sub woofer devices. If there was a Lab10 like Lab12 (Eminence) - go to
https://www.eminence.com/pdf/LAB_12.pdf
that would be perfect.
The FaitalPro 8pr155 is good for a clean and tight bass but not under approximately 50Hz. But for some user of interest, where the prioritization is not on the max low f3 (e. g. sub for electrostatic).
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Cool, next choice is between "the sensitivity" or low extension. You could approach it like this: choose the low frequency point you'd like to achieve, then see how big box you need to get the SPL you need.
Most often the small woofers are chosen to play low and be low sensitivity. Then pour in xxx Watts of amplifier power to get the SPL needed. The sensitivity is not so important since power is cheap. Size is the most important thing to you, and the low extension would be the next most important since it is a sub = you've gotta relax on the sensitivity. Have fun!
ps. determine your absolute maximum box size, that is the most important thing if you want the sensitivity. 12" subwoofer can be made into less than 50l enclosure, not sure whats the bees knees today but for example BMS 12N630 seems to be able to take some power, ~110dB ~40Hz in ~40l box with ~300W (*). If the box is made 20litres only, it can still do ~106db at 40Hz with the same power. I think widows rattle already under 100db, not sure what is your requirement. (*) quick check on WinISD
Most often the small woofers are chosen to play low and be low sensitivity. Then pour in xxx Watts of amplifier power to get the SPL needed. The sensitivity is not so important since power is cheap. Size is the most important thing to you, and the low extension would be the next most important since it is a sub = you've gotta relax on the sensitivity. Have fun!
ps. determine your absolute maximum box size, that is the most important thing if you want the sensitivity. 12" subwoofer can be made into less than 50l enclosure, not sure whats the bees knees today but for example BMS 12N630 seems to be able to take some power, ~110dB ~40Hz in ~40l box with ~300W (*). If the box is made 20litres only, it can still do ~106db at 40Hz with the same power. I think widows rattle already under 100db, not sure what is your requirement. (*) quick check on WinISD
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supplement to post #10: the main speakers from second image are the model Keilidh from Linn, but equipped with the Focal tweeter T120K and PHL-Audio B171 and working as sat-speakers with passive high pass (f3 approximately 70Hz, images I will upload next time). In this attachment the images of crossover network in an enclosure for the new apartment, in the old apartment (images post #11) both crossover network units were on a large MDF board (mounted on the wall) behind the backrest of the couch.
Attachments
according the webpage under
https://hificompass.com/en/speakers/measurements?field_brand_tid=All&field_type_woofew_tid=All&field_material_tid=All&field_dimm_value[min]=0.5&field_dimm_value[max]=18&field_spl_value[min]=78&field_spl_value[max]=115&field_impedance_zn_value[min]=0&field_impedance_zn_value[max]=32&field_fs_value[min]=0&field_fs_value[max]=3000&field_qts_value[min]=0&field_qts_value[max]=3&field_vas_value[min]=0&field_vas_value[max]=600&order=field_vas&sort=asc&page=2
this drivers could be a replacement - but the main difference remains on the parameter Qms - go to the attachments here and compare with the datasheet in last attachment from driver in post #18.
A low loss driver like this one under
https://hificompass.com/en/speakers/measurements/sb-audience/sb-audience-rosso-12mw300
haven't the right value for fs