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In Reply to: RE: SET wtih passive pre? posted by adaug on February 12, 2014 at 17:43:36
I'm using a Passive Pre (an FT "Little Wonder") with my Wright Sound 3.5 (2A3) mono blocks, and it sounds great - very transparent of course, a slightly less forward sound.
I think the amps are less important than the source driving the signal (in my case, an Oppo 105, which has lots of output), low capacitance interconnects, and sensitive speakers.
Fortunately, I have all these elements in the chain.
I have the Wrightsound WPL20 Pre-amp hooked up so I can use its wonderful phono stage; but, when playing the Oppo CDs, it isn't turned on.
Follow Ups:
dvb: thanks for the post. i think that you are saying that for non-phono sources you prefer the sound with the passive in the system to the wright.
i think that you are also saying that a low capacitance intercommnects makes a bigger diff in your system than the amps. thats pretty mind-blowing to me. how can one tell if an intercnnect is low capacitance? can it be measured?
regards
-andre d
"how can one tell if an intercnnect is low capacitance? can it be measured?"
Yes. I use a Sencore LC53.
I just replaced some Monster Cable MSeries M350 (120pF) with some Senergy Cable by Senergistic Research (30pF) and in my application it made a large difference in the high frequencies.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
cool. at what point is the capacitance considered "low"?
thanks
-andre d
All coax wire has shunt capacitance.
It seems like 25-30pf per foot is the "normal" range.
The total amount of shunt capacitance plus the Miller capacitance of the input of the amplifier (or whatever the cable is feeding into) vs. the output impedance of whatever the cable is being feed from creates a low pass filter.
The -3db point of that filter needs to be high enough that you don't have a audible loss of high frequencies or an audible phase shift.
The old rule of thumb goes like this, if you want the system to be flat and phase shift free all the way to 20kHz, the -3db point of that filter needs to be 200kHz.
So, depending on the output impedance, "low" in one system might be "high" in another.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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