Would changing to a MC solve my problem?

The H390 specifications do not give the amplifier’s input sensitivity nor does it give the line stage gain figure (most likely just attenuation with no gain).  I would email Hegel to get the amp’s input sensitivity in order to gain match the source components.  On the surface, it sound like your cartridge output plus phono stage gain is not producing the appropriate voltage to drive your amp to full power.  

I agree

I will ignore your silly riposte. I am not here to do homework. You mentioned the Cary once in one of your early posts, and I did respond to that by saying that most integrated amplifiers (like your Cary) do not add very much if any gain in their built in linestage sections and that lack of an additional boost in gain from your linestage might well be why you are dissatisfied with phono SPLs. As Noromance mentioned, you are getting a nominal 400mV output in signal voltage, with your current cartridge, from your Hegel via its MM stage, which has a robust gain quotient of 46db, when compared to other MM stages. The specs on your Cary indicate that it has a 450mV input sensitivity for full output, which is actually quite sensitive. But CDPs typically make 1V to 2V signal voltage. This accounts for why you may perceive a relative dropoff with analog. So, your alternatives are: buy another high output MM or MI cartridge that makes on the order of 4 or 5mV output (there are many good ones and that is cheaper than buying a new phono stage), or buy a new phono stage, but if you plan to keep the 2.4mV cartridge, you will need an MM stage with at least 50db gain to compete with your CDP (not easy to find), or buy an MC cartridge, or buy a linestage to feed the Cary, or any number of other things. Over and out.

As Noromance mentioned, you are getting a nominal 400mV output in signal voltage, with your current cartridge, from your Hegel via its MM stage,

The Hegel does not have a phono stage.

I think lewm was referring to the V10.

@traudioca 

Not a fan of your cartridge and I would recommend a LOMC of .5mv using 64 db gain on your V10 but don't throw in the towel just yet.  

Use the XLR out of your V10 in MM mode and you can get 50 db gain which should be perfect for your cart.  

If your amp does not accept XLR just buy a pair of Neutrik XLR to RCA adaptors,  i use them with no issue.