Are passive preamps better?


Does a passive preamp with transformers so that its impedence can be matched with an amplifier have the potential to provide better sonics than a line preamp? I have a Simaudio Celeste preamp and a Harman Kardon Citation 7.1 amplifier. Lynne
arnettpartners
Gregm, ok. Yes, the amps spec is given as 1.1V@22K ohm input impedence. On the CDP, if you meant,"did I read it wrong", apparently not. The HD7600ll's output impedence is given as LINE- 2.0V@10k ohms. I thought the other player was the same, but now I see that a spec is not given. It's an H/K FL8400, one model newer--same DAC, probably the analogue section. So I conclude that it won't work. I am mildly interrested in a City Pulse DAC but I think it has the same spec. But another DAC might be a way to get around it. Otherwise, I assume the Placette active would work. Maybe autoformers? Thanks for the clear, simple explanation of impedence vs resistance.
Atmasphere, I finally got something right. Thanks. I've found a lower cost cable that I like but I probably have $1k in cable easily. For $1k, it probably could have been made balanced. Lynne
Hi All,
I am FOR the passives and not against.
There is a simple principle here - the less is more.
An additional circuit is not a benefit to the whole.
The thing is that the output of many of the sources is not
designed to drive the power amplifier directly.
Then there is the problem of impedance matching and that is why some passives use transformers.
A good tube phono pre-map having a cathode follower stage at the output will drive.
So a selector and ladder volume control (Elna, Goldpoint) at the output will be sufficient for a power amplifier with relatively high input impedance and low input sensitivity (0.5V - 1V).
Why add another circuitry in between?
Let's say that the output tube of the phono is 12AX7 and the input tube of the power amp is 12AX7 as well.
Then these circuits probably match very well.
Some do not.
'Everything should be made as simple as possible, but not simpler' - Albert Einstein.
I hear you Aleko. What is interesting about the theory is that so many folks who have tried passives at some point go back to actives, mostly tubed. I like them both passive (rsistor and tranformer based)and tube actives, but as Guy Hummel of Placette once said to me, and I'm paraphrasing, a thousand theories as to what should sound good aren't worth one good listen.