I used to have grand plans for a Adire Audio Shiva, but I'm starting to get the perception that it wasnt really intended for home theater. Although I do like the price tag.
Does anyone have recommendations to some top of the line woofers? Size is no object, really. Oddly enough, bigger is better to many extents. Needs to cover 20 hz decently, provide at least a minimum amount of kick. Something to that serves to the weaknesses of two 21W8555-01's 0.5 Q box.
Oh, and what are acoustic's golden ratios again (just need the #'s)?
Applies for both sealed and ported?
Does anyone have recommendations to some top of the line woofers? Size is no object, really. Oddly enough, bigger is better to many extents. Needs to cover 20 hz decently, provide at least a minimum amount of kick. Something to that serves to the weaknesses of two 21W8555-01's 0.5 Q box.
Oh, and what are acoustic's golden ratios again (just need the #'s)?
Applies for both sealed and ported?
Just hope this helps. I made a ported sonosub using a single driver, which is linear to below 20 hz, and is about 6db down at 16hz. Also, I partnered it with the AVA-250 sub amp from Adire, and I've yet to surpass the half way mark for the output because the amount of bass can easily overpower all other channels without even being up 1/3 of the way. I also use it for music, where it integrates seamlessly with my mains. If you want abnormally high SPL's, then make sure the rest of your equipment, including especially your listening room is up to the task.
The originals I've had were; building dual Shiva, dual 15" PR subwoofers that I dubbed 'mini-Contrabass' after the ServoDrive belt-driven ContraBass subwoofer, but the specs of the current one appears to be more oriented to mobile audio, small prosound apps, though of course doesn't mean it can't perform well in an HT app depending on size/performance requirements.
Regardless, looks like the mains need at least an 80 Hz/3rd XO, so don't need the new Shiva's greater HF BW.
'Size doesn't matter' is for just the driver and/or the box?
How much, if any, room, corner gain can you conservatively estimate to help fill in down low or want it as efficient as practical and shelve it if required and is a Dr. Geddes' multiple individual sub system an option?
Lots of 'golden' ratios 😉, though the Fibonacci is the most common quoted.
Yes, plus ideally any bracing, driver offset(s).