+1 some form of horn for optimum, but for the folks with size/whatever issues, a classic BR [Vb = Vas, Fb = Fs] tuned with a potentiometer [pot] to find the fixed resistor value for optimal in room response [assuming the amp isn't already a matching impedance or at least has variable DF tone controls] or may need a proper BSC [baffles step filter] to do it if there's no adjustable EQ to do it digitally.