The ability to change the V-604a#39;s tuning by blocking and unblocking one port is a valuable feature. ... The Venturi tower ownera#39;s manual, though short, is filled with useful information on the spikes, hookup and cabling, power handling, listening room acoustics and construction, and listener and speaker positioning. ... The rear-firing drivers helped significantly here by adding an enveloping spaciousness to orchestral passages and hall reverberance that was not present with the Baamp;Ws.