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K and K attenuator question

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Posted on February 17, 2014 at 05:36:26
UK Ray
Audiophile

Posts: 212
Location: Somerset
Joined: April 26, 2004
 I've managed to confuse myself - not that difficult critics would say!

My RAKK DAC will have the passive transformer based output module and I have the KandK passive attenuator to go with it.

I'll be following the volume control with a an unbalanced buffer line stage.

Do I wire the the attenuator as a balanced unit as per the diagram here;

http://www.kandkaudio.com/linestage.html

or configure it for unbalanced operation with a 10K resistor just on the + side?

Thanks.

Ray

 

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RE: K and K attenuator question, posted on February 17, 2014 at 07:59:08
KevinC
Manufacturer

Posts: 2984
Location: NC
Joined: April 19, 2001
 Use the unbalanced input scheme with one 10K resistor.

Kevin Carter
K&K Audio
www.kandkaudio.com

 

RE: K and K attenuator question, posted on February 17, 2014 at 12:17:02
UK Ray
Audiophile

Posts: 212
Location: Somerset
Joined: April 26, 2004
 Thank you Kevin. A follow up if I may...

I need to complete my RAKK DAC changes and need to implement a buffer linestage. I have two options to hand (need to keep cost down, at least for now), one is a JFET based unbalanced line amp and the other is a balanced to single ended convertor/line stage. Both offer around 0-6db gain. I lean towards the balanced module but I don't know about Common Mode Rejection; 'out of the box' it offers 50dB common mode rejection but I have no idea if that is good or bad?

Ray

 

RE: K and K attenuator question, posted on February 20, 2014 at 12:23:43
UK Ray
Audiophile

Posts: 212
Location: Somerset
Joined: April 26, 2004
 I asked this question over on DIY Audio too; it seems that 50dB CMR isn't bad within the audio band (which isn't where opamps are measured apparently) so I'm gonna reconfigure the CATO modules as balanced/single-ended convertor line stages and see how it works out.

Ray

 

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