Replacing The Manufacture’s Jumper Bar

[egellings]

All of which is irrelevant. The impedance of the jumpers between your speaker terminals is way too low to make any audible difference to the sound. This is true if they are made from copper - or brass - gold plated unobtanium - wire woven from the hairs of a unicorns mane, or even stamped sheet steel.

We know this because material science, and engineering.

Therefore we know any difference you are hearing is not coming from the sound-waves reaching your ears, but is being generated in the wetware between them.

Agree! Any differences would be picoscopic.

 

[MAB]

I just bought the Jamo c97ii...agree to spicy on top, just turned down with Wiim Pro and all good, do you know where I can find not metal screws?
In my prior Speaker, I change the jumper with Western electric wire WE16GA, which is tinned cooper and the sounds improved like 7%, I tried with same cable to connect inside the speaker to another speaker and was not good all.
This week I will make jumper for the C97ii with western electric wire, I will let you know if sound is better.

No, that length of wire has no audible impact. You are falling for the oldest trick in the HiFI book.
Try an actual resistor. That will actually reduce the treble output. Like this:

Wharfedale Diamond 12.1 Review (Speaker)

Last weekend you could get a new pair for 175€ at Hidden Audio, I got one out of curiosity. Just out of curiosity, is your order processed yet? Mine isn’t and I’m starting to feel iffy.

www.audiosciencereview.com

@thewas demonstrating about the only known useful purpose of split binding posts.
And measure, microphones are so much more sensitive than the ear, and you don't have to deal with your brain's interference with perception.

 

[terryforsythe]

When comparing two different speakers, there is no placebo effect.

The post to which I was replying was a reply to a post pertaining to changing jumpers, not to comparing two different speakers.

 

[Zek]

I just bought the Jamo c97ii... where I can find not metal screws?

You can use the same wire from the speaker cable to connect both terminals (without cutting the wire - just thread it through the lower and upper terminals).

 

[DonH56]

Worrying about brass vs. copper is like worrying about the difference between two molecules in the germ on the flea on the back of the dog. Especially for such a short length. Brass is somewhat less conductive than copper, true, but is only a little worse than gold (which is also worse than copper), and brass is better than materials like nickel or tin that are often used to plate or connect wires in electrical systems.

IME/IMO - Don

 

[Penelinfi]

Only since under blind conditions any imagined differences would disappear.

But measurements are a much more accurate way of determining if any differences actually exist.
The human brain has a way of hearing what it sees, or thinks it sees.
And the shape of your ear is irrelavant, unless your a TV ear model. LOL

The shape of your ear definitely can affect things. If I pull the main part closer to my head like some people have, there is a slightly more diffuse and less hard sound at higher volumes.

Of course that won't help "hear" jumper bars

 

[Norcal]

I was happy when this thread died a natural death the first time, but alas, here we are...

 

[terryforsythe]

Brass is somewhat less conductive than copper,

More than somewhat less. The Conductivity of copper is 58 mS/m. For brass it is 16 mS/m, which is about 28%. But otherwise I agree with your post - generally insignificant for such a short connection considering other impedances/resistances in the circuit, including inductor DCR, inductor core losses, speaker wire, etc.

 

[ROOSKIE]

Then there's the whole subject of why these stupid dual terminals are there in the first place....

I like them as it allows me to easily measure the woofer and tweeter (or whatever config it is) seperately.

I also have no problem with people who want to bi-amp certain speakers(and apply some PEQ separately to each amp), though any gains will be in select situations and even then likely near inaudible.

But yah for most folks what a waste.

 

[DonH56]

More than somewhat less. The Conductivity of copper is 58 mS/m. For brass it is 16 mS/m, which is about 28%. But otherwise I agree with your post - generally insignificant for such a short connection considering other impedances/resistances in the circuit, including inductor DCR, inductor core losses, speaker wire, etc.

My reference says resistivity (bulk, rho) for copper is 1.68e-8 ohm-m and 3.00e-8 ohm-m for 5% Zn brass; higher zinc content will further reduce its conductivity, of course, but even then it is still better than the nickel or tin plating used for many contacts elsewhere in the system. I don't know (nor really care) the Zn content of brass jumpers but your number indicates closer to 30% (?) I recall high Zn content can lead to brass actually being slightly less conductive than pure zinc due to discontinuities in the alloy, but my materials science background is not great so I could be wrong. My point was that, relative to other conductors, let alone semiconductors or insulators, whether the jumpers are copper or brass is not worth considering to me. Should have said that, I suppose.

Copper oxide (green) is nonconductive and brass is a little more resistant to that, but brass is subject to "red rot" de-zincification, choose your poison.

You can have the last word, for me this is not a debate worth having.

 

[T&T]

So, I went ahead and replaced the radar/anttena manufacturer non Insulated jumper, for Western electric WE16GA red cable.
I have no favorite, one have more bass, and the jumper more noisy.

 

[antcollinet]

one have more bass, and the jumper more noisy.

sorry - that is nonsense.

 

[DonR]

sorry - that is nonsense.

Most probably but I won't rule out PEBKAC

 

[T&T]

Most probably but I won't rule out PEBKAC

Yeah, I thing the problem is your IBM error.

 

[DonR]

Yes... heavily leaning to PEBKAC now

 

[Mnyb]

Has the jumper bars jumped the shark yet …