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Old 8th October 2011, 11:43 PM   #1
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Default Burning Amp BA-3b (Balanced)

EDITOR'S NOTE:
This thread has been split from the thread Burning Amp BA-3
Burning Amp BA-3


For those who were not at BAF 2011, here are the bits of my talk on the
balanced version of the BA-3.

Here is the schematic. Note that the two input Source load resistors have
been combined instead of going to ground.

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File Type: jpg 202 BBA-3 SCH.jpg (345.4 KB, 4617 views)

Last edited by Variac; 28th November 2011 at 01:33 AM.
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Old 8th October 2011, 11:50 PM   #2
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Default Try again

And here is the distortion vs equivalent output wattage for two values
of supply rails, and compared with the BA-3.

I think you can clearly see the lower distortion and higher power.

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File Type: gif 203 bba3 damp.gif (9.7 KB, 4035 views)
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Old 8th October 2011, 11:55 PM   #3
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Default And Again...

And here's the distortion vs frequency, frequency response, and input
Common Mode Rejection Ratio.

Ta daaaaa!

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File Type: gif 204 bba3 dFRQ.gif (7.9 KB, 3676 views)
File Type: gif 205 bba3 RESP.gif (9.2 KB, 3543 views)
File Type: gif 206 bba3 CMRR.gif (6.4 KB, 3459 views)
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Old 9th October 2011, 12:04 AM   #4
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How does it sound.

Last edited by buzzforb; 9th October 2011 at 12:15 AM.
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Old 9th October 2011, 12:14 AM   #5
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Nelson,
I have had some audiophiles tell me that more power helps performance at lower volume levels, helping the listener to hear deeper in to the recording without turning up the volume. Do you think this is nonsense or do you agree.
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Old 9th October 2011, 12:47 AM   #6
rsdio is offline rsdio  United States
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Quote:
Originally Posted by buzzforb View Post
I have had some audiophiles tell me that more power helps performance at lower volume levels, helping the listener to hear deeper in to the recording without turning up the volume. Do you think this is nonsense or do you agree.
It entirely depends upon the dynamics in the recording. It also depends upon whether the amplifier design can sustain power continuously, or if it can only provide short bursts of power.

In the case of popular CD "music" which has had all of the dynamics squashed out of it, you probably would not receive any benefit from excess power. There simply are no dynamics in that world, so the headroom remains unused.

In another example, a weaker amplifier may be able to handle most low volume content, but a sustained bass note "hit" may drain the power supply capacitors and temporarily reduce the gain. This is not going to sound natural or transparent. A well-designed amplifier should be able to sustain the lowest frequencies indefinitely, which happens to also allow higher volume levels for shorter bursts. It's a matter of semantics as to whether this additional power is referred to as "excess power for deeper listening" or simply admitting that the amplifier needs that power to reproduce what you expect to hear.

It's all relative. There is no magical enabling to hear deeper into a recording - all audible differences at low levels are explained in terms of instantaneous power versus sustained power. I think the key here is that consumers prefer to think of an amplifier in the simplest terms, as if a given power rating were the only valid power output possible. The reality is that every amplifier puts out a different amount of power at each volume setting, with each speaker, and at each moment of time in the content material.

If you hear an amplifier that seems to have trouble reproducing a particular passage of music at low listening levels, then that amplifier does not have enough power. If you can hear a difference, then the additional power is not excess - it's actually being used.

Brian Willoughby
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Old 9th October 2011, 12:53 AM   #7
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We shall see. BA-3 will go toe to toe with BA-3B
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Old 9th October 2011, 01:05 AM   #8
6L6 is offline 6L6  United States
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Quote:
Originally Posted by buzzforb
How does it sound?
You'll have to build one and find out! That's what I'm doing with the Aleph J - what better way to understand!
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Old 9th October 2011, 01:24 AM   #9
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It was a joke. I always ask stupid questions so i figured i might as well continue. That being said, I have most of the first set of Ba-3 boards finished and the second will get filled next week. Two sets of F4 boards stuffed. Hope to hear F4/BA output with both 240/9240 and 1058/162 in outputs with BA-3 pulling the wagon.
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Old 9th October 2011, 02:10 AM   #10
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Quote:
Originally Posted by buzzforb View Post
Nelson,
I have had some audiophiles tell me that more power helps performance at lower volume levels, helping the listener to hear deeper in to the recording without turning up the volume. Do you think this is nonsense or do you agree.
Who knows? There are lots of examples both ways.

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