How loud are the fans on the pro amps? I.E. Behringer, QSC, Samson. Is any one of these quieter than the others. Is the Crown K series that much better (sound quality, no fan) to justify the cost in an IB install?
There is also the option of switching out the fan for a quieter unit. I did this on a QSC (JBL) amp that uses a 24V variable speed fan, and it did reduce the fan noise significantly. www3.sympatico.ca/bonaz/JBL/Quiet-fan-upgrade/Quiet-Fan.htm I've been running it for over a year without any over heating problems.
Behringer units use 12V fans which is even easier to replace, given their compatibility with computer case fans. There is at one member here who is using a thermally controlled computer fan for even better noise reduction.
If used in the same room, fanless amps have an advantage... but the cost difference has convinced me to find space in the adjoining room to isolate my next unit. Rob
An IB is a more revealing sub than any other design. But I doubt that you'd hear a ton of difference.
Not to say that a K series amp aren't a very good choice. I'm close personal friends with one of the designers of the K series, and it pretty much defines state-of-the-art for that type of prosound amp.