Eantala - Perhaps I don't understand your question, but if I might ask: why is it that you want to maximize the power ("wattage") draw on your amp? Maximizing the power draw on your amp usually translates to more heat, more strain on electrical components, less dynamic headroom, higher distortion, higher electric bills, greater frequency of clipping, etc. In addition, many amps have difficulty driving low impedance speakers, and using a low impedance speaker with such amps will compromise performance, not improve it. If what you want is a pair of speakers that will play louder with your current amp, perhaps you should look at overall speaker sensitivity rather than speaker impedance. For instance, Martin Logan Aerius i's are 4 Ohms nominal impedance dropping below 2 Ohms in the high frequency regime, but they are not all that sensitive and don't play that loud. There are speakers with higher impedance that are more sensitive and will give higher SPL with your amp. Or if you like the sound of your existing speakers, get a bigger amp as some of the others have suggested above. Also, since everyone has different tastes and musical preferences, you should let your own ears decide which speakers are best for you and the music you usually listen to. If you specify what kinds of sound qualities you prefer (dry v. lush, aggressive v. laid back, etc.), what your budget is, and how large your listening room is, I'm sure you'll get a number of good speaker recommendations from the folks here.
