The horns from the 3677's are going into the 7 Pi's which leaves me with the 8.5 cu. ft. snack table and the pair of lightweight 15" woofers. Build a pair of subs? Team them with Motorola piezos for HT surrounds or a center channel? Put them back into the 3677's and find a tweeter to go where the 2618's were? All suggestions appreciated.