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In Reply to: RE: Passives posted by jrdoe on May 03, 2016 at 18:16:37
At the risk of being tagged as the village idiot, which by the way may be more appropriate than I would wish, could one of you give a fairly simple (if that's possible) explanation/definition of "passives"? I apologize for my obvious lack of knowledge with this term, and I think I have a rough idea, but sometimes my lack of understanding things gets in the way of my ignorance of most things. TIA, I think. Dave
Everyone thinks I'm strange except my friends deep inside the earth
Follow Ups:
I really AM the village idiot. Doy.
Thanks so much to Tre', airtime & E-Stat for your simple & informative explanations. My thoughts about passives were almost in the ballpark but you guys nailed it for me. And thanks for not being condescending in your replies since I paraded my ignorance about this subject in front of God & everybody. Sometimes it's easy to be intimidated by being in the company of those who are so much more knowledgeable about these things & it's a pleasure to be enlightened, so to speak, without being talked down to, especially at the tender age of 67. Thanks again, and if anyone needs to know any mechanical tips on disassembling/overhauling & reassembling power station pumps, boilers, turbines, etc., I'm here for ya, with the guarantee of no condescension, Dave.
Everyone thinks I'm strange except my friends deep inside the earth
Tre's answer is very much to the point, but I'll add the notion of why:
When vinyl reigned, cartridges required lots of additional gain (and equalization) in order to drive a power amplifier. Preamplifiers served that purpose along with providing input switching among other things. Today, many digital sources are capable of driving an amplifier directly. All that is needed is the ability to vary the output level and balance.
I used passive attenuators between my last CDP and power amp because it had not only extremely high output - 4V - but also very low output impedance so it was well suited for that purpose.
Nothing more than a volume control between the source and the amp.
charles
A passive line stage preamp (in it's simplest form) is just a pot or stepped attenuator or a transformer volume control or a autoformer volume control in a box with input and output jacks and a input selector switch and has no active electronic circuit or power supply.Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 05/04/16
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