What innovative, unconventional cartridge designs can you recommend?

A couple of posts ago I estimated the heat output of a stylus as about 5 microwatts.

Electromagnetic cartridges, moving magnet MM or moving coil MC, also generate electrical power so I thought an estimate of how much would be in order.

A moving magnet (MM) cartridge produces an output voltage, typically around 5-millivolts, but is loaded by a specific impedance, which is typically about 47,000-ohms.  From Ohm's Law, voltage = current x resistance.  So current is voltage divided by resistance, or 0.005 / 47000 = 0.1 microamps roughly.

Power is current x voltage, 0.005 x 0.1 = 0.0005 microwatts which I guess would be 5-nanowatts for a typical MM cartridge playing a well modulated groove.

Low Output Moving Coil cartridges produce much less voltage but feed it into much lower impedance loads.  Without doing the estimate, I doubt that the wattage would be much different

@richardbrand 

My understanding is that the equalizer has more impact than the cartridge on the sound, hence the stupid crazy high cost of their grandmaster equalizer.  If you’re going to go the optical route, I think you should take fullest advantage of it from the get-go. Hi-fi shark has some options for the DS 003 equalizer preowned. Something to consider. 
 

The only other optical equalizer of which I'm aware is made by Meitner. Anything from him is bound to be good. And expensive. 

@tcutter 

Apparently DS Audio only allows 3rd parties with a global distribution network to list on their site.  There are some small European manufacturers that make equalizers who are disqualified for DS Audio's website.  At least one makes an equalizer without RIAA correction for plugging into a standard MM phono stage.  

The DS Audio range starts with an op-amp based unit and tops out with a two-box solution weighing 40-kgs, more than most power amplifiers!

And so the search goes on ...

The current output of a LOMC cartridge is best estimated by dividing its output V by its internal resistance assuming zero ohm load, is it not?

@lewm 

Here’s the specifications for the ART-1000X which I think qualifies as a Low Output Moving Coil type.  The recommended load impedance (the input to a head amplifier or Step Up Transformer?) is at least 8 to 9 times higher than the coil’s impedance, so I reckon the output current is about ten times less than your suggested calculation.  The voltage has to drive current through the entire circuit, after all!

Or does the voltage output specification assume the minimum output impedance is already connected?  I don't know, but wouldn't you normally measure the output voltage for the cartridge on its own?