Hi, in my hypothetical configuration I have: - a couple of amplified stereo monitor - a energy encore 8 subwoofer (it also amplified) On the imac i've only 1 audio out. On pc instead i've a SB pc card thats have many connectors 4all channel and via software it's possible CUT frequency between speakers and sub. How to do same things with the IMAC? The most cheap solution i've found it's buying a crossover like this one: http://www.behringer.com/EN/Products/CX2310.aspx There are other solution that can make it more simple? or it's the only way? tnx a lot!