GainConcept No.5

[planet10]

Originally posted by XELB

Bigger the Thick of the cable lower the resistor.

This is one of the reasons why thick and good conductivity gives you punchy bass.

Don't really want to start a cable discussion...

Even skinny wire's R is probably insignificant compared to the wire in the voice coil....

In most instances i'm using skinny solid core wire for improved sonics....

dave

 

[XELB]

Punchy bass alone doesn't make a good sound.
Too much is too much, too little is too little.
There's a spot for everything.

Yes, that's right. But it also deppends on the taste of each one...
(I don't like too much)

And btw, the shorter the speaker cables, the better.

That's why I told that bigger the cable more power you lose!
( microscopical Ohm law )

 

[carlosfm]

That's why I told that bigger the cable more power you lose!
( microscopical Ohm law )

But you give too much importance on the least important parameter for a speaker cable: resistance.

 

[XELB]

Normally I don't care about resistance

I test them and if I like their sound, I take them home




Resistance is for picky persons
But if you want to know scientifically how a cable affects the sound, that's a starting point!
( But I don't lose my time with these things.... )

 

[carlosfm]

I test them and if I like their sound, I take them home

You should test at home.

Resistance is for picky persons
But if you want to know scientifically how a cable affects the sound, that's a starting point!

Compared to inductance, and (specially) capacitance, resistance is what has less impact on the sound.
As long as you don't use carbon cables.
If you could have all these three parameters at very low values, you would have a unique cable.
Not possible, though...

 

[XELB]

I allways test at home

I take my amp to a friend shop, test it with the same speakers I have at home and if I like them(cables), I bring them home for the final test.
(I like to test them with the accustic of my listen room)




Inductance and capacitance in cables are very difficult to talk about... this not only deppends in the material you use but also in the construction of the cable.
The construction can also affect resistance but, resistance is allways more "connected" to the quality of the material then to construction.

 

[Stabist]

Bigger the Thick of the cable lower the resistor.
(and bigger the distance between the amp and the speakers, bigger the power you lose)

If you want to have the same output power with a thin cable, the thin cable must have better conductivity.

And altough thicknes of single UTP Wire is sooo thin - it's still very hard to measure resistance with DMM - or better said - comparing thick snake-look-a-like beast with that single UTP wire shows same result - around 0,1R ...

But you should not forget that the "snake type beast" has a potetnial big skin effect ...

Punchy bass alone doesn't make a good sound.
Too much is too much, too little is too little.
There's a spot for everything.

And btw, the shorter the speaker cables, the better.

Both statements are something I very agree with!!!

 

[Stabist]

CRC and regs

Btw - one Q - last weekend I tried another PSU layout for my GC preamp section - carlos advised me some time ago to use CRC + regs - so with using what having on hand I've done newt combination:
1000uF/25V PanFC ---- 110R ---- 1000uF/25V PanFC --- L7815
1000uF/25V PanFC ---- 110R ---- 1000uF/25V PanFC --- L7915
BUT - on one resistor the voltage drop is higher for 0,5V?!?! Is that because positive and negative regs draw different currents (OK, that would be logical then) - or is something else wrong here ...

Btw - I've made a mistake at first test - forgot to connect "gnd" from two gretz bridges to gnd pf caps and regs - so for a short time on one pair of PanFCs there were 33V - but that's like few seconds - and they seem to work OK ...

 

[Upupa Epops]

Only two parametres are interesting on speaker cable : resistance and inductance. Typical capacitance of speaker cable is for PA's output insignificat.

 

[carlosfm]

Typical capacitance of speaker cable is for PA's output insignificat.

Typical yes, but there are some weird cables out there.
Not for me, thanks.
High capacitive cables always affect the treble (they make a low-pass filter, in fact) and the bass gets untight too.

I'm talking weird things like the top of the range Wireworld cables (coaxial), which sound horrible with most amps, cheap cable is much better.
Kimber 8TC doesn't go with some amps too, while the 4TC is ok.
The 8TC and the Wireworlds are high capacitance cables.

For the diyers: crossing too much Cat5 cable is throwing away the baby with the water.

Resistance doesn't tell me much, a cable that has 2.9 ohms resistance for 1 Km (!) doesn't have to sound good. I mean: Supra Classic 6.0.

 

[carlosfm]

Re: CRC and regs

1000uF/25V PanFC ---- 110R ---- 1000uF/25V PanFC --- L7815
1000uF/25V PanFC ---- 110R ---- 1000uF/25V PanFC --- L7915
BUT - on one resistor the voltage drop is higher for 0,5V?!?! Is that because positive and negative regs draw different currents (OK, that would be logical then) - or is something else wrong here ...

The 79xx regs usually draw a little more current.
Are you worried about a 0.5v difference before the regs?

 

[Upupa Epops]

Low pass filter ? By Zout = 0.1 Ohm or less ? It must be realy " high capacitance cabel ".

 

[Stabist]

Re: Re: CRC and regs

The 79xx regs usually draw a little more current.
Are you worried about a 0.5v difference before the regs?

Not woried - but I'm learning - and this was some new fact for me ... All cleared and solved out now

 

[carlosfm]

Low pass filter ? By Zout = 0.1 Ohm or less ? It must be realy " high capacitance cabel ".

You have to count with the speaker.

 

[Stabist]

GainConcept No.3

In last months I've been quite GainBuildingMan ...

........... then experimenting by OPA541/OPA2604 combination (which shows a lot of potential but it still needs a proper chassis) ........

Quite some time ago I've started this topic - and the first post contained also the quoted part ...

Well - now I can finnaly present to you GC No.3

At that time it looked like this:

 

[Stabist]

As said - that didn't seem a proper chassis to me - because it was to open and also quite ugly ...

But since I didn't find time or motivation to realize some "heavy" Al chassis - but still wanted to finish somehow this project - I've decided to give another shot with "recycling" method

So some old Nokia switcher donated the base for the chassis ...

And then it was combined with some acryl at the back .....

 

[Stabist]

... and also at the top ... The original Nokia chassis was to "goldish" if you ask me ... OK, also this Acryl ain't something very nice - but I think it looks better that way (alltough I know I could do it much better) ...

 

[Stabist]

The front is made out of some very old (and also bent a bit ) mahagony wood ... But I must admit that I think it looks quite nice ...

 

[Stabist]

And this are the guts ...

Trannie is/will be in separate chassis (at the moment I use the trannie of my "PatekLine GC"
Then there is snubberized PSU.
And as said - a combination of OPA541 and (at the moment) OPA2604.
And attenuator is DiY made - simple 2x12 steps switch converted to attenuator ...
Nothing special ..

 

[Igla]

Stabist,
where do you got silver wire you are using for GC wiring?
From some local store?
I would like to buy a few meters.
Regards;
Matjaz