Fallingsnowfy - The AV1's use the GR-T3 1" dome silk tweeter which has a very open, transparent sound quality. Both the AV1's and the XL-S Encores are excellent sounding speakers. Compared to the AV1's, the X-LS Encores have stronger bass and cleaner bass due to its larger woofer size ( 6-1/2" vs 5-1/4"), greater power handling, and smoother overall sound.
Jay - I agree that shipping cost is a problem and is frequently a deal breaker. Even if the speakers are being sold at a low price, a lot of potential buyers just don't want to pay the shipping cost which can sometimes be high due to the distance.
Ron