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Output impedance of Legato 3
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glt  
#1 Posted : Monday, October 10, 2011 11:56:54 AM(UTC)
glt

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Is it 1KOHM?
Can it be lowered?
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Russ White  
#2 Posted : Monday, October 10, 2011 8:53:08 PM(UTC)
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No. :) Its about 150R at the balanced output. Actually slightly less. At the SE outputs its practically zero to 100khz.

Edited by user Monday, October 10, 2011 8:54:02 PM(UTC)  | Reason: Not specified
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glt  
#3 Posted : Monday, October 10, 2011 11:38:33 PM(UTC)
glt

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Hi Russ,

Thanks. Wanted to use it with http://www.diyaudio.com/...fets-21.html#post2738299
and take advantage of the cm rejection of the balanced input. Otherwise, the IVY III would be perfect -but I already have the Legato
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Russ White  
#4 Posted : Tuesday, October 11, 2011 5:23:59 AM(UTC)
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You could probably use that amp without any issues, just adjust the feedback resistors upward a bit, I see that it has AC coupled inputs. Hopefully that is optional.

If you are after CM rejection you might try Sympatico. It has the benefit of being fully symmetrical at the inputs and the outputs and is completely DC coupled and has much higher input impedance. It also has the PS built in and local shunt regulation.

Edited by user Tuesday, October 11, 2011 8:14:23 AM(UTC)  | Reason: Not specified
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Russ White  
#5 Posted : Tuesday, October 11, 2011 6:21:40 AM(UTC)
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Honestly that amp is probably just not a great fit for Legato because of its low impedance asymmetric nature.
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glt  
#6 Posted : Tuesday, October 11, 2011 9:19:47 AM(UTC)
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I thought the same too. IVYIII is a better fit...
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Russ White  
#7 Posted : Tuesday, October 11, 2011 7:27:44 PM(UTC)
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That amp is not going to have "good" common mode rejection with any balanced source because of the asymmetrical nature if it's input impedance. If that is what you are after you should look elsewhere. Acceptable sure. Awesome, no.

Edited by user Tuesday, October 11, 2011 7:51:33 PM(UTC)  | Reason: Not specified
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