Why do you guys pursue a flat frequency response when you buy a subwoofer?

" Imo the first issue can be addressed by designing the subwoofer to have a native frequency response which slopes gently downwards by the approximate inverse of "typical" room gain, or 3 about dB per octave. I'm not saying this is the only way of addressing this issue, but imo it results in a reasonably good starting point.

The second issue (rollercoaster in-room response) presents an interesting challenge. Opinions vary on how to address it."

Duke, 
Can you name the popular opinions among sub manufacturers on how they think it should be addressed? Of course, more subs a.k.a an array of 4, 8 or 16 is great for business. But, are there other opinions out there?

I currently have Rythmiks (room1) and HSUs (room2) at home and a BIC PL 200 II in my shop. The BIC is not flat and i saw some clowns arguing in a forum that the BIC is very very bad because of the peak in its spec! However, this budget BIC actually sounds pretty freaking good to me and i use it largely for music in my shop. As far as the manufacturers coming up with a flat response (Rythmiks, HSUs, SVS, etc), Is it just a "statement" that they are competent enough to come up with a flat response? (though it means jack sht after it goes in the room) 

A careful look at the dimensions of your various rooms may tell you quite a bit about why the shop sounds so good.

obviously Danny at Rhythmic , Duke at AudioKenisis, and others know what they are doing relative to room nodes, room gain, and designing for flat response, some w adjustable phase. My favorite designer is Vandersteen’s with 11 bands of EQ below 120 HZ, variable count our, EQ centers on common room nodes. Contrary to Miller’s myth, many sub designers are very aware of Earl Geddes seminal work on multiple subs to cancel out constructive and destructive interference ( Duke you really should look at the wave photo I emailed you long ago ), I will post it in my virtual system page... perfect example of constructive/destructive interference), Many ( but thankful not all ) customers don’t want a forest of subwoofers in the room. RV power factor corrects his supplied amp which also has feed forward control - others use servos, etc. point is there are some fantastic subs out there.
one way to quickly judge sub integration with mains and response and pitch definition is by listening to well recorded scaling acoustic bass - Ray Brown Soular energy is fantastic for this :-)
enjoy your BIC and other subs OP, enjoy the music !!!!

I think most people use multiple subwoofers when possible and PEQ regardless of the number of subwoofers used, in order to flatten out the actual in-room frequency response. Sometimes with a slight curve providing bass emphasis as a personal preference.

Contrary to Miller’s myth many sub designers are very aware of Earl Geddes seminal work on multiple subs

What myth? Hello! Tomic601! What myth??? Where did I ever say many sub designers are not aware? There’s a function, cut and paste. Please use it to substantiate your insult or withdraw it. Thank you!

OP you have three subs. Thus this thing is a whole lot easier for you than most. Simply put all three in one room and find out for yourself what happens.

tomic601 not letting you off the hook. I know perfectly well the last thing I ever do is promulgate a myth. Serious insult buddy. Prove it, or apologize, or be forever branded a liar. I think we all know which one it is, but I’m giving you the opportunity to pretend you read me wrong.