Originally Posted by aboroth00
My problem is adding a subwoofer and adding a high-pass. I'm sure many purists battle with the same thing.
Depends whether you are an rational purist or an irrational purist.
I chose the arbitrary 80hz number because of the SMS-1's inability to change its HP XO. My bookshelves are -3db @ 45hz so crossing anywhere from there up would be satisfactory of course avoiding localization. Placement and the actual XO point (if I can change it) will be of a concern when I actually place them in my room. But it's probably going to be where my previous sub was (which gave the flattest response) at the previous XO point I used (80hz) verified by in-room measurements. Of course some eq here and there doesn't hurt.
It is easy enough to eq either the input or the outputs of the crossover.
Another option entirely is to not put the XO in the chain and allow the bookshelves to play to their lowest point (they're sealed), and they will gradually roll off.
This scarifies one of the big advantages of a sub, which is keeping the LP out of the mains so that they are cleaner.
Adding the subwoofer at this point is easier accomplished due to the lack of the need of a HP.
I would say it is harder because the crossover gives you more control when it controls the signal that is sent to both speakers.
However, will this be advantageous?
I guess one issue comes to mind is the fact that a sub can play lower frequencies at the cutoff of the bookshelf with lower distortion as the bookshelves' woofers are experiencing higher excursion.