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For me Mac is like a Rolex . They are beatiful , very beatiful , but sound and time measurement are an "optional " Ciao Marco

Ciao ! Marco

Welcome ! We were born to play with Phase Linear ( and more ) . Ciao Marco

Thank you again . Marco

Thank you my friends . Marco

Suddenly my father passed away this morning at 95 , due a heart failure . Marco

" Child in time " from " Deep Purple in rock " and Sultans of swing . Listened on AR 3a , Allison One and finally , after an heavy lunch at my father's home , on AR 9 at my home like a digestif . Always full power of course . Merry Christmas again Marco

Merry Christmas to all . Marco

Welcome aboard ! Marco

However in our hobby , we generally use relative levels and not absolute levels . For example we use dB to define gain and loss : this line amp has a 15 dB gain or this phono amp has a 45 dB gain @ 1khz In these case dB is only a number and not a value ! Anyway ,for me , it's correct to know...

I was sure we would talk about dBFS . :):):) Ciao Marco

Let's start from here : https://sonicscoop.com/2018/03/29/everything-need-know-audio-meteringand/1/ and : https://www.canford.co.uk/TechZone/Article/dBComparison Ciao Marco

Oh , I smell a discussion like "arm resonance ". :):):) The definition of dB can create a mess Ciao Marco

Ciao from Italy Marco

http://waynestegall.com/audio/warpfilter.htm An other approach , that I think you already know . A notch filter trimmed for 33 rpm and hipass filter I 'm becoming younger Ciao Marco

It' s not a classic approach , but now I'm beginning to understand . Thank you Marco

Jim , before going on what do you mean for elliptic filter ? For me it's a Cauer filter . https://en.wikipedia.org/wiki/Elliptic_filter If I have understood well , you mean a device that filters only L-R part ( in other words below 150 Hz the signal is mono ) Good idea ! Below 150 Hz...

Thank you , now I must study . Ciao Marco

In Carver C4000 service manual you can find the electric diagram for a subsonic filter . It's an active filter . Download it from HiFi engine . Ciao Marco

https://en.wikipedia.org/wiki/Mass_versus_weight Read carefully this article , if you want . It's not simple , but the mass is not the weight ! In the trade , however , for simplicity you can say that the mass is the weight . Ciao Marco