Exlibris wrote: "The reason I’m interested in making a change is not because adding subs threw off the balance, it’s because I find the speakers to be a bit "sleepy."
You might try a rear-firing tweeter to add a little bit more top-end energy to the reverberant field. This could theoretically "wake up" the tonal balance a bit WITHOUT screwing up the first-arrival sound and therefore the imaging.
The tweeter could actually sit on the floor behind the Audio Notes, facing upwards. You want to be sure the path lengths from the rear tweeters to your ears are at least a foot longer than the path lengths from the main tweeters to your ears, or else they could screw up the imaging. Probably just a first order crossover (series capacitor and maybe a level-adjusting series resistor),with the calculated F3 being fairly high. To avoid dropping the impedance curve very much, I suggest starting out with a high efficiency tweeter so that you need to add some series resistance to pad it down. Fostex comes to mind.
I'm sure there would be some trial-and-error involved in sorting out the component value(s) for the highpass filter, but ten or fifteen bucks worth of basic capacitors and resistors would get you started, and then you could opt for the more expensive parts once you have the values sorted out.
Duke
