Small(est) sub project

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Hello, what's the smallest sub you've ever known or heard? I refer to size between 15-30 liters and 10'' drivers.
I've listened for example a Klipsch KSW10 and for its size is a little miracle: about 25 liters in classic vented downfiring configuration. It uses a 10'' driver called K-1070-K, does anyone know its T/S parameters?
klipsch ksw10.jpg
klipsch ksw10_.jpg
ksw10 specs.PNG
Klipsch K-1070-K.jpg

The only one I've ever seen is a Peerless XLS application note using a 10'' driver in 20 liters but whit a passive radiator, rather expensive system, while I'll have to contain costs.
What may be the magician of a Klipsch's-like driver? What may be the best T/S values for these small subs, even in car audio range?
Thank you very much.
 
Awfully loose subject there. I've seen a 2-3 ltr box with the W3-1876S that was impressive. I've seen 0.5ft^3 box with W6-1139 that was really nice, as well as a 7-8 ltr vented box with the W5-1138 subwoofer. The latter 2 here were really impressive.

How about the smallest, most impressive subwoofer you've experienced? I honestly say that title has been received by my 'Overdrive 10' 4th order PR-bandpass sub. Dayton UM10-22, Dayton RSS315PR, and a Yung SD500-6 plate amplifier. 26 ltrs internal volumes totaled, and enough oomph to really impress you.

Later,
Wolf
 
Hello wolf-teeth you're welcome! All projects you mentioned are joint by using all low sensitivity drivers, with particular reference to Tang Band. I've already built something using a TB W8-2022, characterized by similar formulation (medium Qts, low Fs, low Vas, low efficiency), in a small PR enclosure, but I'd want to change root, efficiency is for me an important factor.
I've built a vented enclosure for my Peerless XXLS 830846 10'' DVC driver, but to "make it sing" it was necessary 64 liters (because of the slight different measured T/S parameters respect declared ones), very very well sounding but too big for my tastes.
For this reason I was fascinated by mentioned Klipsch subwoofer, rather certainly not using a low-efficiency driver.
 
Hoffman's Iron Law = of the 3 considerations in bass, you can only pick 2: small size, high sensitivity, and low bass extension.

Here's my guess- the Klipsch is tuned higher than optimal, in a smaller box than optimal, and has enough power to overcome the sensitivity problem. Unless it is a high-Q driver, then the output is favored over low-end extension. It's likely not all that different from most other drivers out there in subwoofers; especially commercial units.

Later,
Wolf
 
Generally if one wants the most bass in the smallest space, try a high quality car audio subwoofer.

The JL audio 10w3 for example has 14mm of liner excursion and works in a sealed box of around 18 litres.

The 10w6 has 19mm of excursion and works in a 15.5 litre box, given 500 watts or so these subs will give plenty of bass and you can secret several of them about the room unobtrusively.
 
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