can you name the sub?
actually i've just bought today the GUSTARD DAC-X16 Dual which has XLR outputs, but that doesnt help me in terms of my turntable.
can you please recommend a good RCA to XLR CABLE? guess i can use one of those with the turntable preamp
If you have completely no idea of external crossover or don't bother like I do (I personally use the 8030C without any sub) you can just go with the Genelec 7040A or 7050C, in which you go dac-> sub->8030C, I think from their own manual the 7040A have a high pass filter to cut off those frequency below 85hz and pass to your main monitor, while 7050 have more input and output where it don't have built in high pass, just low pass the dac signal into the sub, then send the same signal to the main monitor, but genelec own manual makes it quite clear how to set it up.
just to say first it seems genelec sub isn't as brilliant in absolute terms as they excel in main monitors but those are still great subwoofers, and the main benefit beside the built in high pass is that the gain switch is the same as their own main monitors, so selecting both at same setting would result in same SPL ignoring the room mode, which you will need some measurement and DSP to fully mitigate