The official "Theta" thread - Page 277 - AVS | Home Theater Discussions And Reviews
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post #8281 of 8292 Old 05-23-2015, 11:18 PM
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Originally Posted by rhale64L7 View Post
?..All I do really care about is the resulting sound.
Same here.

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post #8282 of 8292 Old Yesterday, 10:32 AM
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Originally Posted by rhale64L7 View Post
...... All I do really care about is the resulting sound. My Krell Chorus amp was the only amp I had that was truly balanced from input to output. So I have no predestination for such a design. ......
Great way of looking at it. Like anything else in technology, you can have a very good unbalanced design and a crappy balanced design. The mere fact of a balanced amplifier technology does not automatically equate to a superior design.

My personal preference is an unbalanced design. Less complexity for the same achievable performance.

*Note that this has nothing to do with a balanced input stage (XLR connection). That is a different issue.

Also consider that any bridged amp is a balanced amp. So most "thumpers" (car stereos) are balanced amps!

The old "Ampzilla" circa 1974 was a balanced design, and a rather good one for those days.

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post #8283 of 8292 Old Yesterday, 10:44 AM
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Balanced class D?

I doubt there are any balanced class D amps out there.

Yes it could be done, two PWM chains each acting on positive and negative portions of the input signal. But the resulting timing problems would be a challenge to resolve. Remember that a class D amp core operates in the hundreds of khz. And I can see no performance gain for all that extra cost and work.

Now if you operated two class D amps in a bridge mode, that would technically be a balanced amp. But as class D amps are capable of very high power at excellent efficiency, why would you need a bridged configuration in the first place?
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post #8284 of 8292 Old Yesterday, 11:04 AM
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Quote:
Originally Posted by Glimmie View Post
I doubt there are any balanced class D amps out there.

Yes it could be done, two PWM chains each acting on positive and negative portions of the input signal. But the resulting timing problems would be a challenge to resolve. Remember that a class D amp core operates in the hundreds of khz. And I can see no performance gain for all that extra cost and work.

Now if you operated two class D amps in a bridge mode, that would technically be a balanced amp. But as class D amps are capable of very high power at excellent efficiency, why would you need a bridged configuration in the first place?
Thank you! This is the simple yet definitive Rick-Steves type answer I was looking for.

I was just curious as Jeff/Theta's answer appears to imply as much: there is no such animal as balanced class D amp. Really was not looking to comment on sonic quality or anything like that.

FWIW, I have many various components with balanced vs single ended outputs over the years. I do use balanced connections if there is a choice, but don't tend to hear any difference either.

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post #8285 of 8292 Old Yesterday, 11:57 AM
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This is all good to know. Thanks people for easing my mind until the Dreadnaught D gets here. Then I will be able to listen for myself.
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post #8286 of 8292 Old Yesterday, 12:01 PM
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the Ncore based design does not benefit any further from being "fully balanced" in the classic sense since the ncore design inherently rejects noise. This is how I understand it... You could email Bruno and I'm sure he would fill you in.

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post #8287 of 8292 Old Today, 12:49 PM
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Just recognise that Class D inherently has very low PSRR while the inherent PSRR potential of Class A (or AB) is very high (and why they can run on unregulated supply rails and alleviate the potential problem of supply sag). So a Class D amplifier has to 'battle this inherent weakness', so to speak. The nCore do this very well due to their feedback network and high loop gain. (Remember, there's no such thing as too much feedback.) Bruno has commented that the waveform of a switch-mode power supply is easier for the nCore modules to deal with (as both are switch-mode devices).

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post #8288 of 8292 Old Today, 02:03 PM
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Quote:
Originally Posted by Glimmie View Post
I doubt there are any balanced class D amps out there.

Yes it could be done, two PWM chains each acting on positive and negative portions of the input signal. But the resulting timing problems would be a challenge to resolve. Remember that a class D amp core operates in the hundreds of khz. And I can see no performance gain for all that extra cost and work.

Now if you operated two class D amps in a bridge mode, that would technically be a balanced amp. But as class D amps are capable of very high power at excellent efficiency, why would you need a bridged configuration in the first place?
In doing some casual research, there are some reference designs that show a bridged configuration.

A dead give away is if the negative speaker terminal is grounded. If the manual states not to allow the speaker ground connection to be grounded to the system ground, then you do have a bridged amp.

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post #8289 of 8292 Old Today, 02:11 PM
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The Dreadnaught D says that in the manual. At least from what I remember
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post #8290 of 8292 Old Today, 02:34 PM
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Quote:
Originally Posted by rhale64L7 View Post
The Dreadnaught D says that in the manual. At least from what I remember
Says what? Not to ground the negative speaker connection?

If that's the case, then it is likely to be a bridged design in which case is also balanced. I stand corrected then.

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post #8291 of 8292 Unread Today, 02:36 PM
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Yes almost positive it says that in the manual. . I will reread it later and post up what it says.
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post #8292 of 8292 Unread Today, 04:18 PM
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It says warning each channel is a balance bridged amp. Thus the negative speaker terminal is not a ground.
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