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12.48.16.2
Hi,
My McCormack TLC-1 passive pre has input impedance specified as 13K. Looks like the Eros wants at least 15K. Is this a problem? What exactly happens when input impedence is too low? I would like to try an Eros but not sure about all this impedance matching stuff.
Link below for more test data and specs on the TLC-1. Thanks in advance.
Follow Ups:
Looks like the input impedance of your preamp is quite stable (based on the review posted), so the Eros will likely work well in spite of the heavy load. The Eros output circuit is basically identical to Seduction except that it has a capacitor twice as large. We have used Seduction into the Sweetest Whispers wired as a 15K "passive preamp" and found it quite satisfactory as long as the power amp has sufficient gain. For that application we usually recommend a larger output capacitor in Seduction, to preserve the deepest bass. The larger 1.0uF Eros capacitor is probably quite good, though you could experiment with a larger cap, up to maybe 3.3uF.
The effects of a lower than optimal load impedance are a reduction of gain (around 3dB with a 13K load) and an increase in distortion. The circuit can output 15-20 volts, so in normal operation with 20dB headroom the distortion will be quite small even into a 10K load.
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I'm sure that if you use short, low capacitance cables you will not hear any difference between your preamp's load and 30k ohms.
Remember, YOU are the only one who needs to be happy with the sound of your system
Grainger Morrison
There Is Only One (Grainger Morrison, it seems)
Thanks for the quick reply Grainger. This is probably a dumb question but my cables are DIY VH Audio Pulsar which, according to Chris VH, are rated at 19pf/ft. My cables are 2ft. I have no idea what a typical RCA connector on each end adds to the total but it seems like I am in the ball park of "low capacitance"?
I asked PJ just what was low capacitance cables the other day in a post.
Yours are good.
Remember, YOU are the only one who needs to be happy with the sound of your system
Grainger Morrison
There Is Only One (Grainger Morrison, it seems)
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