Musical Fidelity A300 Integrated

Try Cardas cables in your system, get the Golden Reference, if you can swing it. Used Golden anything they make should add the mellow sound you seek and cool off your tweeters . Other than that you run into major structural changes in your system. That might mean no more Musical Fidelity SS gear which tends to be a little hot in some systems.

I have a Rega Apollo CD and PS Audio 3 Dac via a PAD digital feeding the N804's. I'm using Nordost Red Dawn IC's and SC with Atlas jumpers. I'd describe this system as very defined and boardering on a bit brite (almost as a good thing). I really don't want to warm it too much but maybe bring a bit more bass out. Not sure if that might just be a trait of the N804's??

The N804s are a bit lean in the bass, although I agree that
the Golden Reference cables should make a big difference; I
use 'em and really like them. I have never liked the sound of
Nordost cables with Musical Fidelity or B&W. Also, you may
want to try bi-wiring the N804s as that should help with the
bass issue.

Did you find the Nordost added to the brightness? I'll need to find a set of Golden Reference to audition... Are you Bi-wiring the golden reference and is that an improvement verses jumping them?

Yes, the Red Dawn did add to brightness. I am bi-wiring with
the GF and the results have been good. Look, the N804s
inherently are never going to be bass beasts, so you will have
to accept that. Nonetheless, bi-wiring them brings out a nice,
tuneful bass that is not overpowering.