Bi Wiring Speakers from Luxman L-509X

The high pass crossover has high impedance at low frequencies and the low pass crossover has high impedance at high frequencies.
So " - to -, and + to +" basically still = 8 ohms.

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imhififan, Erik is correct you are NOT

Measure a static load at the speaker terminal, not the driver. The amp sees that. The crossover may well have all kind of thing to add resistance to circuit, you still add the combine resistance in THAT circuit..

If you have two separate circuits ( lows and mid/high), no matter in a series or parallel crossover design, the law of 1/2 the total or the combined total still stands.

(If the lows are wired at 8 ohms and the mid/highs are wired at 8 ohms)

No, it's 4 ohms just like I said in parallel.  In series it's 16 ohms. (16 won't work, it is an example) The crossover can't work in series because of the way the signal would be passed from low to mid/high or vice versa. The load would still be 16 ohm load, the speaker wouldn't work correctly..

- to -, + to + (parallel) = 1/2 the combined total

- to + to - to + (series) = add the two together

Split the load between two different amps the amps sees 8 ohms ea.

If the highs are @ 8 ohm and the lows are at 8 ohm.

At least the 2-220 crossovers that I've repaired or built.. Maybe you got a different DMM LOL, people still amaze me..

Regards

you have convinced yourself; am I overthinking it? stand out to me.

https://www.audioadvice.com/videos-reviews/speaker-bi-wiring-bi-amping-explained/

what speakers?

note: these units, 2 pairs of speakers is not for bi-wiring, rather different spaces. the amp's power for each pair must be effected, there may be microseconds of timing delay, ...?

note: your Luxman unit specifically: the speaker's impedance restriction 8-16 ohm load if two pairs; 4-16 ohms if only one pair shown on the back of the amp. that indicates it cannot safely (within warranty) provide full power when both pairs driven. 

Lots of great input which I expected.

To answer one comment above, the primary reason for this question at all is cost. Two full pairs of cables is more expensive than one. At this expense I don’t want to get down the road and find it was not a good fit.

The plan is to get two sets with locking banana connectors. If I need to run them off of one set of speaker outputs on the amp then I would have to consider one set with bananas and one set with spades to allow both sets to connect to the same binding posts.

The speakers are rated at 4ohms. This presumes the woofer runs at 8 ohms and the mid/tweets run at 8 ohms to provide a combined 4 ohm load. Is this correct math?

So if the four 8 ohm driver circuits are connected to the two pairs of speaker outputs am I within the 8-16ohm limits when all four speaker terminals are connected?This, and Elliot’s comment above, is what I’m trying to sort out.

I believe I’m OK. Is this right?

this amp, existing 4 ohm nominal speakers, you are best with using one set of speaker outputs. single cable, or as you say, two pairs of cables that can fit together on the same terminals.

two pairs of speakers: neither can be below 8 ohm 'nominal'. little dips, ok, lot's of near 4 ohm, no.

OP your math is correct..

IF you have dual binding post at the speaker, bi wiring is a second pair of cables from the same common output post on your power amp..

If you have a single set of binding post at the speaker, your doubling the run, but not bi wiring. Does it make a difference, ONLY if the single  run cannot carry the load correctly.. Double the run or go to a larger size construct..

I've ran two different types of cables to the same binding post. Silver ribbon and OCC copper weave.. Nice combo.. Different story..:-)

Regards