Intact Audio

Dave , please , you know what I am talking about , the minimum input sensibility as write in the Firstwatt document

these words are not from me , but from Nelson Pass


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Hello Dave , My range of attenuation is my range of tension , I have not need to attenuate voltage that I dont have , and I have no need to attenuate below my amplifier minimum sensibility for the step the more the better , I suppose fact is that I dont know what is possible or not , I just know wha...

Hello Dave,

I normaly listen at less than 5 w , but it happens that I listen with the dac full scale , so 2.0 v rms into the amp

as said before my range is 0.5 v to 2.0 v rms

my speakers are 6.0 ohm

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Hello Dave , my amp is an F6 from Nelson Pass , when I say sensibility is 0.5 v rms it means it is the minimum , it has 14 Db gain , it's maximum input sensibility is 2.83 v rms and then it start to clip , so with my 2.0 v rms dac output i wont make it clipping anyhow here are the data for this amp ...

Hello Dave,

I thought it was possible to wire an autoformer for my setup ( cost was not an issue ) , like having 24 steps ( or more ) to go from 2.0 v rms in to 0.5 v rms out , I was wrong

Thank you for your answers



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Hello Dave,

ok , what do you suggest as a custom autoformer , knowing what is it for , and knowing what are the various impedance involved

i wont ( ever ) have more than 2.0 v rms in , and my amp sensibility is 0.5 v rms

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Hello Dave, the dac has no volume control I have it through the pc ( personal computer ) when I listen music with youtube or online radio my concern is when I use my cd transport ( micromega cd 3.1 ) it output full digital level to the dac what I want is having an autoformer attenuation after the da...

Hello Dave ,

what would you suggest to make the situation more "practical" ?

when I use the same system using the digital volume attenuation of my pc it works pretty well , it is still 12 dB


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Hello Dave ,

I want to control de volume of the all system made by :

cd drive to Dac to amplifier

I thought the autoformer could be custom made in order to have 14 steps of nearly 1 dB , or 28 steps of less than 0.5 dB

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Hello Dave ,


You are right , I lost myself in calculation !!!

I need to attenuate my dac output from 2.0 v rms to say 0.5 v rms in the more step as possible

so I need 2 autoformers to do that job


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Hello Dave,

what I mean is , my dac output is 6dBv ( 2.0 v rms ), so I dont need more attenuation than 6 dBv

what would you suggests in my situation


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Hi all, I am planning to ask Dave for a pair of custom made AVC , it will be use just after my DAC , witch output 2.0 V rms , 112 ohm Z out , to drive my F6 amplifier with 10 k ohm Z in am I wrong thinking that - 6 dB is my max reduction ? I could have 14 step of 0.5 dB what do you guys think ? .