Hi I have just had the bk and I tried the planks for 10 h frankly he made an exeptional, very good quality and above all really 'linfrabass in more than 18. "Rendering is really very physical (the do vibrate jaws really). regarding the speaker is obviously huge and I pensse it is their manufacturing because it is above this acoustic Write Orpheus etan it is really very very good and I say it in Compared to my other boxes equipped with fades (colossus xb 18 ") and other teams in b & c (18tbx100) that are already good box!
I advise to make the investment the wood is very dense (which poses a problem any time the weight 130kg, not 117 as it struts Write)

it will in the medium against acute I have three really powerful cube jbl equipped with RCF (15mb401) and heads das Biflex 20 which is not bad but it's almost limit and pavillonaire
Finally voila it will also need a very large amplifier as we tried with a crest twice 1300w (under 4ohms) bridged by the bk and well I'm sure he was very close to its limits, I pensse that a two pound five would be perfect!
need I say more so you need a crossover (I have a ecler in 30-250Hz) filter because it is not what is normal in my opinion
basically very good value for money pensse I buy another soon
if you want more info on such inside contact me hello