I was intrigued by the bucket subs as suggested by Transcendent Sound. Here is the link: Bucket Sub
Below a photo of the subs on my workbench.
The woofers are being driven by a Behringer iNuke 3000 DSP. The amp is cheap and has a lot of power and is capable to push the drivers to their maximum mechanical excursion. The Behringer’s ventilator is noisy and can be heard at lower volume levels. In some forums there are suggestions for silent replacement options.
The first listening impressions were positive.