Preamplifier woes

[Beat_Dominator 5,000+ posts]

I wub j00 B&W_EE //content.invisioncic.com/y282845/emoticons/inlove.gif.6846f78f06b405429ef3a00129788a2a.gif

 

[thylantyr 10+ year member]

It's a different gain structure... Simple... You DON'T NEED HIGH VOLTAGE PRE-OUTS!!!

Correct, you don't need unless you have a problem that needs solving.

I can argue both sides of this argument. The way I look at this is. If I was given

the choice to choose 1V unbalanced preouts vs. 8V balanced preouts and the

other variables remain the same including cost, then take the higher voltage

balanced design because you have insurance. You have to analyze all the gear

in the chain to make sure it supports it.

I use proamps in the home so it makes more sense to choose XLR balanced

high voltage preout preamps. Using low voltage and unbalanced is not optimal.

Like I said, I don't know what the OP has for his system, but I would look into

high voltage balanced preouts if his gear can support it.

What is so hard to understand about Low-Drive = Efficiency = Clarity!!!

Makes no sense, explain.

Less voltage = less distortion

That is a design issue. You can make a 300v preout with low distortion. Many

quality opamps can do high voltage preouts as a standard feature with inaudible

distortion. It's the design engineers who dummy down the circuit so it only offers

1V to maintain that ancient home audio standard. lol ... ie, IIRC, the ancient 5532

opamp can do 9v rms output, a $1 opamp. If I was building a custom preamp

and amplifier, there is no reason I'm dumb down that opamp to 1v, I'd take

full advantage of it's abilities.

less voltage = less crosstalk

This is a design issue. Crosstalk is determined by many variables. You can design

a low crosstalk circuit with high voltage.

smaller components = faster components, faster components = more accurate ones.

I don't understand what you are saying here, explain.

Pro-audio uses XLR and Higher Voltages for a simple reason distance.

There are too more variables as to why do they this.

There is more to gain with balanced, high voltage preouts than low voltage

unbalanced. It's basic electronics. This doesn't imply that unbalanced, low

voltage will have problems, but there is less change of gremlins

manifesting with the other. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

FYI, I'm not picking on Rotel or Parasound, nor do I really pay attention to what you folks have

in possession. I just randomly chose those two products to illustrate my preference...

so.. don't take it personal... //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[Beat_Dominator 5,000+ posts]

thylantyr is wrong //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif

 

[JimJ 5,000+ posts]

I use proamps in the home so it makes more sense to choose XLR balancedhigh voltage preout preamps. Using low voltage and unbalanced is not optimal.

Like I said, I don't know what the OP has for his system, but I would look into

high voltage balanced preouts if his gear can support it.

It doesn't //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

My stuff is based on designs that came about decades before stereo came into existence, you think I'm running balanced inputs? //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[Beat_Dominator 5,000+ posts]

Jim, you are too hardc0re for me.

 

[JimJ 5,000+ posts]

What's an opamp?

//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif//content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

I think mine fell out somewhere...

//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[Beat_Dominator 5,000+ posts]

Oh noes! you need dem! //content.invisioncic.com/y282845/emoticons/eek.gif.771b7a90cf45cabdc554ff1121c21c4a.gif

 

[Beat_Dominator 5,000+ posts]

So Jim, you're sure this:

: is too ugly for you? I'm going to put it on the 'Bay tomorrow if you for sure have zero interest.

 

[JimJ 5,000+ posts]

Yeah, go ahead and sell it...

 

[ballstothewall 10+ year member]

*Psssst* donate it to me....

Ok, now what is the difference between balanced and unbalanced inputs, please explain it to me, I'm a little hazy on that issue.

 

[Beat_Dominator 5,000+ posts]

Will do Jim.

ballstothewall: balanced uses 3 conductors instead of 2. 2 pass the + signal but in opposite in phase to eachother, then the 3rd is the - . Balanced lines tend to be a bith higher in voltage as well.

 

[ballstothewall 10+ year member]

The advantage of balanced is what, no crosstalk?

 

[GordonW 10+ year member]

Balanced lines have the advantage of rejecting RF noise better than single-ended interconnects (ie, RCA). RF in the signal, CAN have the effect of making hiss/noise/grit/grain worse. Having the amp deal with abnormally high frequency content/RF might cause it to go unstable, in some cases... many amp designs are NOT meant for that kind of bandwidth!

Of course, RF-stoppers (ie, the ferrite beads that snap onto interconnects and power cables) can help in a case like this, with RCA interconnects. But, there's only so much you can do, when the cable itself WANTS to act like an antenna (unlike a balanced cable, where RF basically CANCELS ITSELF OUT, inherently)...

Regards,

Gordon.

 

[joetama 5,000+ posts]

What's an opamp?
//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif//content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

I think mine fell out somewhere...

//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Oh nooooossssss.....

So Jim, you're sure this: http://bilder.minhembio.com/bild/index.php?pic_id=82942.jpg : is too ugly for you? I'm going to put it on the 'Bay tomorrow if you for sure have zero interest.

How much are you looking to pawn it off for?

And Thy, I'm busy right now, but as soon as I get unbusy I'll answer those questions for you //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[Beat_Dominator 5,000+ posts]

I offered $475 shipped to Jimbo but he no likes it //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif