(dons Helmet, kevlar vest and cup.) Biwiring Cornwall IVs any benefit?

As the title states, is there a benefit to this? I have a Luxman L-507z integrated amp.

Thanks in advance ( no hits to the face please)


No benefits. Bi-wiring is just a ploy to get you to buy more wire. Bi-amping using an electronic crossover and another amp to drive the woofer separately from the mid/tweeter is beneficial as it offers better control/damping of the woofer.

Bi-amping removes the inductor and capacitor from the woofer and connects it directly to a separate amp connected to an electronic crossover.

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@jasonbourne71 1++

 If you were using 32 gauge wire bi wiring might be a benefit, but with Cornwalls if you are using anything larger than 18 gauge bi wiring will do absolutely nothing except waste your money. Bi amping with an electronic crossover is another story. With Cornwalls the best tweak you can run , by a country mile, is two subwoofers with a 2 way crossover set to 100 Hz. The Cornwall's woofer is responsible for a large part of the midrange and very low frequencies will cause Doppler Distortion. Adding subwoofers and removing those frequencies from the Cornwalls will clean up your midrange substantially and increase your headroom by about 10 dB.  

My advice is: Make sure your Cornwalls are wired correctly internally. One of my new Fortes was wired out-of-phase. 

Thanks for the ideas guys! Ill try it .. i have one sub atm a Kef KC62, should i set it to 100hz?

Dwelter: you do know tha'ts a common practice with speaker design and may actually be intentional.  

Some designs this is normal you should check to make sure its not intentionally wired that way. 


I've never heard that wiring ONE speaker OUT-OF-PHASE is a good thing. Regards

Ya, Ive watched some videos with conflicting information. Supposedly the Cornwalls can reach to 34hz of course thats including volume roll off. I ran a SINE test from 100hz to 5 hz and I lost the cornwalls at around 55hz...might be my hearing or i needed to have the volume higher. The Kef KC62 has an adjustment for crossover and a volume control. I have it connected via pre-out on the Luxman L-507z. Anyone have a sure fire way to figure out where i should set the KC62 crossover at and what volume? Thanks very much

He’s wrong at 13:50 and the high frequencies goes though the upper wire and the low frequencies go through the lower wire.

When he says the "signal" he is referring to the "potential" to take the signal from there, but as he shows, only the current for each driver travels through it’s respective wire. If only the current for that driver is traveling through the wire, then only that portion of the signal is traveling through the wire that point in time.


But at 17:16, he shows that the full signal is still in each wire. WRONG. He is only showing that the potential to take the signal from that place is full range. HE NEVER PUTS THE SCOPE IN SERIES WITH EACH WIRE TO SHOW WHAT IS ACTUALLY GOING THROUGH IT! Sure the potential is there at the terminals, but unless you use that potential, it is not manifested.

Another flaw is that he brings the wires back together before they reach the amp giving them a "bridge" before they can "dump" into the amp’s ground. For best results, he should be using the amp’s terminals.

Then when he actually examines what is going down each wire, like he did for the current used, rather that what is just "available" from the pair, I’ll reconsider.


Not a good idea with only one sub. At 100 Hz you will definitely be able to localize the sub and with the slopes most of these subs use they will creep into the midrange.  You need stereo subs to do this along with a two way crossover. The low pass filter that comes with most subs is a half baked method of trying to integrate a subwoofer. One of the benefits of subwoofers is being able to remove those frequencies from your main speakers which has serious benefits, but you need a real crossover to take advantage of this. 

Ok, my question from that video is, I have A nd B outputs available on the Luxman amp. If you were to bi-wire, why wouldnt you run the A side to the HF posts and the B side to the LF posts and select A&B on the speaker select switch?

Run with two separate subs and you’ll never look back. I have the III’s with two subs still happy 5 years later. No bi-wire and No plans for upgrades. Sound stage is amazing at all volume levels. 

Ok, can you tell me where you cross the subs over? 50hz 60? Where and did you connect them via pre-out?  I was considering another KC62 and connecting them .

Im a newb tho and not sure how they all fit.

I have two SVS self powered subs that I connect via RCA to the preouts on my preamplifier. I wouldn’t get caught up in pinpointing a specific frequency but you could use 50-60 as a starting point. The main point for me was making sure the subs blended with my speakers. You don’t want to hear the subs, you will find a sweet spot. Play some music at different volume levels and mess with the level and frequency knobs until you’re happy with the sound. If I recall you can adjust phase also. I’m not familiar with your subs but just play around with them. I don’t think there’s a set rule you have to abide by as far as frequency goes. Just set it where you think it sounds good for you. I do have both subs set the same once I get it to my liking. This is what works for me in my room with my setup. Good luck! 

....remember to take a good long stare at the existing Xover circuit if you don’t know what design it is....the simpler it is or isn’t, the more complicated your life can get...;)  or not....

But this does give you an excuse to ’play about’.....perhaps, a lot more than you’d expect (points, slopes, overlaps....all that...)

Have fun, and Happy New Year.....

Bi-wire is a maybe at best, but getting jumpers and getting that piece of cheap steal out of the circuit can make a huge difference! I have tried bi-wiring my KEF’s a couple of times and the best I can say is maybe I heard a difference. I bought a decent pair of jumpers and they made an immediate difference in the brightness and Dynamic presentation.


   My experience applies only to my set up, so grain of salt, etc.. My Paradigms absolutely benefited from bi-wiring. Maybe it's the connector the speakers come with between the binding posts, but bi-wiring makes a positive and very audible improvement on my speakers. Decent quality jumpers also improved my sound, but not as much as bi-wiring.

 Anyone who says "never" is speaking outside their experience and/or would likely be content with coat hangers for speaker wire. They're usually the ones who think if two wires deliver the requisite voltage, they must be identical.

I have good jumpers in now and they helped. I have another set of speaker cables I can try too..it's free so why not. Did you use the A and B speaker channels?