Bi Wiring Speakers from Luxman L-509X

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

The low and high pass filters means the multiple drivers are not not seen in parallel by the amplifier. They are seen as separate entities.

For a better view to understand this, please see my post here:

https://speakermakersjourney.blogspot.com/2016/12/crossover-basics-impedance.html

My original statement, that using the A+B outputs to bi-wire a speaker is equivalent to using just A or B stands. The amplifier won’t know the difference and hopefully you’ll see the explanation in the post.

Using simple, DC analysis for equivalent resistances is not appropriate in this case. It would work (with a lot of slop) with parallel drivers of the same type in the same section, like having 2 woofers for instance.

@Erik_squires  +1

I hope oldhvymec had read the link @Erik_squires provides for better understanding how a parallel crossover works.