I havent heard the 703s but I own pair of 804s now for about two years. I find them very neutral, transparent and incisive with a slightly tip up high end that sounds very refined and detailed particularly when feed with good quality electronics and recordings. I dont find them bass shy. I suspect this perception is due to their lack of mid bass bloom and neutral character. However when partnered with a good quality (high current) amp the 804s really blossom with surprising bass extension and weight that matches the agility and natural clarity of its mids and highs.
When I first bought the 804s I owned a Rotel RB1090 power amp (380w/ch) and was impressed how the 804s expressed the full body sound of this amp. However when I recently upgraded to a pair of Jeff Rowland 201 mono blocks (250w/ch)and a Wadia 301 CD player not only did I hear how much more refined and musical these devices are but also how much more capable and deserving these speakers are of high standard partnering equipment. Like most of the B&W range they are well made and look pretty good too.
When I first bought the 804s I owned a Rotel RB1090 power amp (380w/ch) and was impressed how the 804s expressed the full body sound of this amp. However when I recently upgraded to a pair of Jeff Rowland 201 mono blocks (250w/ch)and a Wadia 301 CD player not only did I hear how much more refined and musical these devices are but also how much more capable and deserving these speakers are of high standard partnering equipment. Like most of the B&W range they are well made and look pretty good too.