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Old 16th October 2011, 06:49 PM   #361
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Hello.
The Legato 3.1 works perfectly. Has lower distortion than IVY-III circuit and sounds better, especially bass.

But the balanced output + and - features 9 v. respect to ground. I will used it with balanced DCB1 and F5X (EUVL).

As one of the advantages of both DCB1 and FX5 will be that will be coupled in continuous, capacitors employment would spoil all advantages.

To solve the problem I can think of two circuits. It is floating mass to set XLR Pin 1 to 9 v.

I have a doubt that will work best of two. And what better 0 to15 v. or -15 to 15 Volts?

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Old 16th October 2011, 07:05 PM   #362
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Hmm, I am not sure you will need such a circuit at all. You should just be able to leave pin1 floating or simply GND only one end. In fact it might not be a good idea because if the possibility of a short.
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Old 16th October 2011, 07:18 PM   #363
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If I were going to do such a circuit I would simply put a couple of 10K(or similar value so as not to unnecessarily load the output) resistors in series across the balanced outputs and take the center(junction). Then use that for your common mode voltage (buffered). But once again you would have to be sure pin1 never made contact with common GND (say earth GND not necessarily 0V) or you would get a short.

As I said I can't think of a reason you would need to do this.
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Old 16th October 2011, 08:25 PM   #364
NicMac is offline NicMac  Italy
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Quote:
Originally Posted by oneoclock View Post
Hello.
The Legato 3.1 works perfectly. Has lower distortion than IVY-III circuit and sounds better, especially bass.
Are you sure Legato has lower distortion than IVY?
I agree that Legato works perfectly, if it sounds better is a matter of taste, but that IVY should be shy or imprecise in bass is certainly not my impression.
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Old 16th October 2011, 09:11 PM   #365
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I measured the armonic distortion is much lower in my circuit. It is important that they are perfectly united Q2-Q3 and Q5-Q6. This is what more reduces the harmonic distortion in my circuit.

And the bass of IVY was the best and most accurate that had ever heard ... Until I heard the Legato 3.1 on a friend's house.
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Old 17th October 2011, 02:53 AM   #366
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Hi Oneoclock.

Hmm this is very interesting to hear. I had an early version of Legato tested by a third party and it measured slightly worse (though only very slightly) in terms of dynamic range, but almost identical in terms of THD as IVY-III. Can you share your results?

Thanks! Russ
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Old 17th October 2011, 02:11 PM   #367
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This is the armonic distorsion 1000 Hz. tone measure with my IVY.
7 dB down since the 1000 Hz tone have +7 dBu.

Tomorrow I get the measure of Legato 3.1

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Old 17th October 2011, 02:16 PM   #368
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How are you measuring? Differential? The 3rd harmonic is much higher than I have ever seen before. But this could be because of the higher level.
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Old 17th October 2011, 02:55 PM   #369
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To give you an idea, this is the result of the testing we had done on the Buf32S which is the same output stage as IVY-III.
Attached Files
File Type: pdf Buf32S_1_0_Test_Results.pdf (111.4 KB, 131 views)
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Old 17th October 2011, 05:27 PM   #370
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1000 Hz. + 7 dBu. measure 7 dB down is correct.
The measures in balanced and unbalanced are very close.
The output level and measurement equipment configuration is identical to IVY

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Legato III 3.1

Last edited by oneoclock; 17th October 2011 at 05:35 PM.
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