Differences between high current amps and normal ones

[3db]

That's one thing I like about The Audio Critic's amp tests, they use the PowerCube system which simulates inductive, resistive, and capacitive loads when testing an amplifier, and at differing impedances. I think its results are more useful than static 1KHz-into-an-8-ohm-resistor tests that seem to rule the day today. I wish more amplifier reviews would include this type of objective measurement, as it gives a better idea of how an amplifier is going to behave into a cantankerous loudspeaker.

*ROTFLMFAO* I've heard of a cantankerous wife but never a loudspeaker.

I know what you are getting at but it just sounded so funny at the moment

 

[mtrycrafts]

Whew! I'm glad we got that settled.

That's just a temporary settlement

 

[mtrycrafts]

That's one thing I like about The Audio Critic's amp tests, they use the PowerCube system which simulates inductive, resistive, and capacitive loads when testing an amplifier, and at differing impedances. .

Yes, indeed. They drop the load down to 1 ohms to check rail voltages at these different loads.

That Behringer A500 that has been talked about is a beast under that test. did a bit better than the Bryston multi channel amp reviewed there

 

[mtrycrafts]

Now this other amp (follow the link below) is only rated 60WX2, but I am going to call it high current capable whether you agree or not. Again, it is "relative". This thing doubles down from 8 ohms to 4, 2, and all the way to 480W into 1 ohm and frequency response from D.C. to 130 kHz.

http://www.onahighernote.com/luxman/?c=4&id=35

And we are way off topic!!

They gain this huge capability from increased rail voltage, not current delivery, quadrupling the rail in fact.

While there is no increase in current, the voltage is quadrupled. With so much power on tap, the dynamic swings are amazing.

Being off topic at times adds to everyones knowledge.

 

[TLS Guy]

I don't think that would be accurate though
They gain this huge capability from increased rail voltage, not current delivery, quadrupling the rail.

While there is no increase in current, the voltage is quadrupled. With so much power on tap, the dynamic swings are amazing.

Being off topick at times adds to everyones knowledge.

No! Do the calculation. The output voltage is constant. It holds constant in the face of falling load resistance. The voltage voltage is 22 volts at 8 and 1 ohm.

 

[mtrycrafts]

No! Do the calculation. The output voltage is constant. It holds constant in the face of falling load resistance. The voltage voltage is 22 volts at 8 and 1 ohm.

That quote about voltage being quadrupled comes from them. So what does that mean then? Perhaps in mono mode they quad the voltage?

 

[TLS Guy]

That quote about voltage being quadrupled comes from them. So what does that mean then? Perhaps in mono mode they quad the voltage?

Here is the math I posted yesterday and it's correct.

Lets take a look. 60 watts into 8 ohms requires a voltage of 22 volts at 2.7 amps. Now if we maintain that voltage into a one ohm load we get 480 watts with a current delivery of 22 amps. So yes, that is high current capability as long as the load resistance is very low. That would be a really unusual speaker that could draw that amount of power from the amp.

It would be a strange amplifier indeed that increased output voltage in the face of declining load resistance, they struggle to maintain it and an awful lot fail which is another crux of the problem.

 

[TLS Guy]

*ROTFLMFAO* I've heard of a cantankerous wife but never a loudspeaker.

I know what you are getting at but it just sounded so funny at the moment

I've called them worse!

 

[fmw]

Temporary indeed. I thought we had it settled. Guess not. Let's read on.

 

[TLS Guy]

Temporary indeed. I thought we had it settled. Guess not. Let's read on.

So did I! The worst part is that in no time at all someone will start an almost identical thread without bothering to dig up this one and others before this one.

 

[mtrycrafts]

Here is the math I posted yesterday and it's correct.

Lets take a look. 60 watts into 8 ohms requires a voltage of 22 volts at 2.7 amps. Now if we maintain that voltage into a one ohm load we get 480 watts with a current delivery of 22 amps. So yes, that is high current capability as long as the load resistance is very low. That would be a really unusual speaker that could draw that amount of power from the amp.

It would be a strange amplifier indeed that increased output voltage in the face of declining load resistance, they struggle to maintain it and an awful lot fail which is another crux of the problem.

Yes, I understand all this. But, it still doesn't explain to me the quote at that page in the link talking about quadrupling the voltage and not increasing the current; this is what I am scratching my head with.

 

[TLS Guy]

Yes, I understand all this. But, it still doesn't explain to me the quote at that page in the link talking about quadrupling the voltage and not increasing the current; this is what I am scratching my head with.

Stop scratching, it's bad for your scalp.

 

[B3Nut]

Haaaaaaaaaaaaa!

 

[gus6464]

Ok I came across this hybrid integrated with a tripath class T amp.

http://www.obadimports.com/catalog/item/4377302/4639260.htm#image_1

As you can see it almost doubles it's power at 4ohm which means it has a pretty stout power supply. Now what is class T? I don't see it mentioned in any post. From what I read online this integrated actually has good quality parts inside.

 

[mtrycrafts]

Stop scratching, it's bad for your scalp.

Yes, thank you but the underlying problem is still unresolved. The itch is ongoing.

 

[mtrycrafts]

Ok I came across this hybrid integrated with a tripath class T amp.

http://www.obadimports.com/catalog/item/4377302/4639260.htm#image_1

As you can see it almost doubles it's power at 4ohm which means it has a pretty stout power supply. Now what is class T? I don't see it mentioned in any post. From what I read online this integrated actually has good quality parts inside.

http://en.wikipedia.org/wiki/Electronic_amplifier

This explains it towards the bottom under other classes. It is in essence, most likely, a modified class D amp design.

 

[TLS Guy]

http://en.wikipedia.org/wiki/Electronic_amplifier

This explains it towards the bottom under other classes. It is in essence, most likely, a modified class D amp design.

You are right. I have found out it is a switching amp. An outfit called Tri-Path technologies have introduced some amp chip sets, they are calling class T. They seem to call it that, but I can find no details that justify them calling these chip sets another class.

There is nothing special. They seem to increase power, however look at the distortion. They are quoting output powers with up to 10% THD. Who wants to listen to that?

 

[B3Nut]

There is nothing special. They seem to increase power, however look at the distortion. They are quoting output powers with up to 10% THD. Who wants to listen to that?

Marketing weasels, of course. It lets them quote a bigger number. In a perfect world, the engineers would all revolt and the entrails of weasels would be strewn about the landscape, but alas...

Just like Tripath's "Class T" moniker...pure weaselese. Just another switching amp. They're good if implemented properly, and the switching-amplifier technology is promising, but IMHO quoting output power at 10% THD is beyond pointless. I saw a Panasonic shelf stereo with output power quoted at 1KHz, 10% THD. This is progress?

 

[3db]

Marketing weasels, of course. It lets them quote a bigger number. In a perfect world, the engineers would all revolt and the entrails of weasels would be strewn about the landscape, but alas...

Just like Tripath's "Class T" moniker...pure weaselese. Just another switching amp. They're good if implemented properly, and the switching-amplifier technology is promising, but IMHO quoting output power at 10% THD is beyond pointless. I saw a Panasonic shelf stereo with output power quoted at 1KHz, 10% THD. This is progress?

Yep. Needed to keep up with the loudness wars. Who cares about fidelity anymore??

 

[mtrycrafts]

You are right. I have found out it is a switching amp. An outfit called Tri-Path technologies have introduced some amp chip sets, they are calling class T. They seem to call it that, but I can find no details that justify them calling these chip sets another class.

There is nothing special. They seem to increase power, however look at the distortion. They are quoting output powers with up to 10% THD. Who wants to listen to that?

Hey, that is a sub amp Subs are tested to 10% distortion.