I'm planning on buying new drivers for an older pair of MMT speakers I built a while back. The original drivers are pretty shotty, but the cabinet and finish I spent weeks on. So I figure they're due for a tune-up. So upon my search for a pair of 8" drivers and 1" dome tweeters, I find myself ruling out drivers that are too efficient for matching with any tweeter. I am going on the assumtion that 2 woofers in the enclosure increase sensitivity by +3 dB. (Although I have read that it's actually +6 dB). So I need clarification there too. Take for example the two speakers I have currently found: woofer spl 1W/1M 91.5, tweeter spl 92 dB. I plan on wiring the woofers in parallel for a 4 ohm load. The problem I'm seeing is now I'm looking at my woofers being 2.5 dB louder than my tweeter. So what do I do? Find a more efficient tweeter to match or less efficient woofers? And obvisously the option is open for an attenuation circuit on the tweeter, but this only works if the tweeter is more efficient than the woofer. In most cases I have seen so far, the two woofers are going to be more efficient than any tweeter. What to do?