I picked up a pair of these speakers off of craigslist for 200.00. The cabs have 2 15 inch woofers and on top it has a jbl 2446h horn. The problem is on the side it has terminals for Hf and LF. When i hooked the speaker wires to the HF terminals nothing happened. So i took the plate off and there is no wires connected to it. Just wires to the LF terminals. Do i need a crossover for the HF terminals. Im really at a lost. Also i see on the web that speakers are 4670d cinema Loudspeaker System.