@traudio you have some great equipment. The Hegel is a great integrated. I agree that it is likely silly to put a tube pre in front of it but if you are already planning on going the separates route, you might by the pre first, try it, might surprise you. Hegel makes great amps and the amp in your integrated can drive most speakers without issue. Now, preference on the sound signature difference between the amps is a different animal, for sure you might prefer the sound signature / pairing with your Maggie’s if you swap amps / pre’s. I have compared Tube amps / pre’s to SS. I’ve landed on liking a tube pre with SS. As others have mentioned, can give you the best of both worlds. Pass, Krell, Coda would all be great pairings with your Maggie’s, known to drive difficult speakers loads across a wide range, handle dips into the 2 ohm range. A couple of less expensive options would be Parasound and Music Fidelity, both design SS amps that are great at driving difficult loads and punch well above their weight class. A Parasound A21 was my fist serous 2 channel price of equipment, added into my HT set up, starting me down the 2 channel rabbit hole, great amp. Adding Subs would be my first move, before changing up your pre / amp. Those would be a game changer. Might find that with the subs, you love the Hegel handling the mids and highs. Good Luck!