I've done exactly that, changed from RCA to XLR at the rear of my turntable and replaced my tonearm cable with balanced interconnect.
I think my sound was improved slightly by the connector upgrade, but mostly it's a matter of eliminating partial connections, hum and accidental disconnects when working around the equipment.
There's a nice, secure feeling when you "click" the phono connection into place, knowing it's securely fastened and making maximum contact.
All that being said, I'll take an upgrade in cable with RCA over XLR at lower quality. If you can manage both, it's the best of all worlds.
I think my sound was improved slightly by the connector upgrade, but mostly it's a matter of eliminating partial connections, hum and accidental disconnects when working around the equipment.
There's a nice, secure feeling when you "click" the phono connection into place, knowing it's securely fastened and making maximum contact.
All that being said, I'll take an upgrade in cable with RCA over XLR at lower quality. If you can manage both, it's the best of all worlds.