How to select cartridge output to match phono amp


I have a Musical Fidelity XLPS phono stage that has sensitivity specified as 350micrvolts and input impedance specified as 100 ohms.

From this I am not sure what level of output I need from an MC cartridge in order to work well with this pre-amp.

Would the Sumiko Blackbird with 2.5mV be sufficient? What about the recommended 47k Ohm loading for the blackbird? What will happen when connected to the XLPS with lower impedance?

Thanks for your help
John T. Riordan
riordan

Showing 2 responses by dougdeacon

I'm not familiar with the XLPS, but those specs are consistent with a phono stage intended for a medium-lowish output moving coil.

You have enough gain for cartridges down to about .5mv output. I'd look for something between .5 and 1.5mv.

If your input impedance is fixed at 100 ohms then you should consider cartridges designed for that. Plugging a cartridge that wants to see 47K into a 100 ohm load will overdamp the generator. The result will be a stifled, muffled, lifeless sound with a serious HF rolloff.

It's not hard to find excellent MC's with 0.5mv output. There are dozens to choose from in that range, and the majority actually prefer a 100 ohm load. I expect that's why MF designed the XLPS with those specs.

Note: www.kabusa.com has an online gain/sensitivity calculator. Very useful.
Good work Herman. If John's unit also has a 3mv/47K input then of course a Blackbird should be fine.

I hate these trick questions!