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Benz SLR Gullwing, not sensitive to loading?

Hi there,

Does anyone else here has a Benz Gullwing (or LPS = same generator) wich does not react to input impendance?
I's on a Clearaudio Ovation with TT5 arm. My phono stage is a Graham Slee Reflex C in wich I just soldered 47kOhms resistors when I got the cart, before was 1kOhms.

Now I ripped some tracks to my computer to see if 100, 1k, 22k or 47k sounds better using a Y-connector with resistor. And there is not the tiniest difference in sound at all. Plus the three tracks even have the same volume level. I'm not used to that because all the MC cartridges I heard before sounded (more or less) brighter and the level dropped a little bit when I raised the loading.

Is there something wrong here?

tealow

Showing 1 response by mulveling

mulveling's avatar
mulveling
2,135 posts
 

You should definitely hear a difference from 100 ohms to 47k. Sounds like something's off in the loading setup, though I can't guess what that might be. The signal loss from 100 ohms loading, on the 38 ohm SLR or LPS coils, is almost 3 dB (versus 47k) - which alone should be extremely audible, and will surely come with frequency response aberrations on top of that.

Signal Loss at 100 ohms:

20 * log(100 ohms / (100 ohms + 38 ohms)) = -2.8 dB

Signal Loss at 47k:

20 * log(47000 / (47000 + 38)) = -0.007 dB

Personally, I felt my LPS to be lackluster with 10x SUTs loading it around 470. It did much better, and came alive with an active JFET stage loading at 1000 ohms.

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