Crossovers / Impedance Question

I'm trying to piece together a component system with some speakers I have, and I need a little advice from the experts here. I'm not using a separate amp - I just have a Kenwood head unit at 50W x 4 (22 RMS). I'm thinking of wiring two 4ohm speakers (1 tweeter, 1 mid/woofer) in parallel on each of the two front channels. I know if do this without a crossover, the 2ohm resistance will probably be too much for the head unit amp; but, the speakers I have do have crossovers (2500 cutoff for the tweeter and 3500 cutoff for the mid/woofer). That effectively gives me an overlap of response at the 2500-3500 range, and I'm assuming a 2ohm load in this range only. Would the load in this small frequency range cause any problems for the head unit amp? I'm assuming over most of the freq range, my HU will see an effective 4ohm resistance in each channel. Do I have this right? See any big problems with this 2ohm range on this head unit? Any help is appreciated. Thanks.

Yes, it can cause problems for your HU, but more importantly it will cause problems for You as your "overlap" area is exactly where you do not want it to be.  Adding the response of the two speakers together in the 2500-3500 Hz range will make the system sound too "present" with heightened midrange response.  It can sound like listening to the telephone.  You want to de-emphasize this range, not over-emphasize it, as it is also right where our ears are most sensitive.  I recommend building a new crossover with the Xover point and slopes matched.

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I think you'll be pretty safe doing that. If I had to guess, that overlap is probably right around where the impedance peaks are on both of the drivers, effectively showing a higher impedance to you head unit's amplifier. Personally, if these are NOT the crossovers that came with the speakers, I would not use them. An overlap like that is going to probably be pretty unpleasant... That is pretty much in the peak of human hearing sensitivity.

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