Impedance of biwire-able speakers

Thanks guys - that's exactly the kind of feedback I needed.

Have a great holiday,
Dave

Thank you both, Sean and Gregadd. I am new to audigon and am finally delving into higher end audio for the first time. I have been a 'wanna-be' audiofile since my college days in the 80's, but have let marriage and kids take the front seat. I am asking about speaker impedance for two reasons. I do understand that speaker load is dynamic and subject to several factors. But, several years ago I fried one channel of my Phillips FA80 integrated amp by driving 2 pair of speakers simultaneously - (1) 4 ohm pair (KEF Q15) and (1) 6 ohm pair (MB Quart somethings...). So if I get the amp fixed and want to use both channels to drive the pair of bookshelf KEF Crest 2's I just bought, I want to make sure I dont burn it up again. Second, I have found a mint pair of KEF 104.2's and will be shopping for new components to drive them; but in the mean time don't want to mess my receiver up if I 'bi-amp' them with both channels (of my Onkyo TX8511 receiver). I am on a tight budget for a while, but refuse to do without my music. I want to experiment and learn, but can't afford to run out and buy a hi-end preamp and amps right away. I have just received my Canare 4S11 cable and want to have some fun! Thanks for your time.

Sorry for the poor explanation. Yes, I'm talking about using 4 channels of amplification just as Sean described, from one receiver. Each speaker post would be hooked up to a seperate output post on the receiver. Thanks again.

Thanks guys. I am using an Onkyo TX-8511 stereo receiver (no A/V or surround- it has two sets of speaker jacks (A & B) and switches to play one pair (A), the other pair (B), or both pairs of speakers (A and B). There is also a switch on the back for me to select speaker impedance - one position is for when I have 8 ohm speakers hooked up to A OR B; and the other position is for when I either have 4 ohm speakers hooked up to A OR B, or when I have 8 ohm min speakers hooked up to A AND B. This is how I got to my original question - are my new 8 ohm bi-wire speakers still acting like 8 ohm speakers when I wire the tweeters to A and the woofers to B? (When I had two pairs of speakers (1 pair 4 ohm, 1 pair 6 ohm) I never played A AND B together.)
Dave