IS THE WEISS 204 A SUBSTANIAL UPGRADE FRON THE CHORD QUTEST

Looks like you’re in NY so this 501 may be a local pick up for you. 

Resolution is defined by the sample rate and bit depth. Both of those in turn are defined by your source. Any DAC that changes even a single bit in the bitstream is by definition, defective. So, no. The Weiss will not have, cannot have, better resolution. Nor is it likely to be meaningfully quieter, since the noise floor to peak output on both is far greater than dynamic range of your room noise floor to peak system SPL, which in most domestic systems is lucky if it hits 60dB.

That said, does it have noticeably better reconstruction filters or a better analog output? Those are things you may possibly determine through listening.

@panzrwagn you’re mostly correct. Weiss cannot have better resolution than the Chord Qutest. If we’re talking about the bitrate. Now…better power supply, better clock, isolated USB, better analog stage, etc. that’s what matters. You get lower noise floor that results in better resolution of detail, not better resolution in bitrate terms.

Can you make a recommendation or do all DACs sound the same?

All DACS must be 100% accurate in decoding the bitstream or else they are defective. So yes, all DACS have to sound the same. Where they may vary is in reconstruction filters and analog output stage.

Power supply differences are again largely mythical unless you are seeing power supply spuriae in the audio bandwidth and at levels within the dynamic range of the system. If your system has a peak SPL of, say, 113 dB, that requires a 90dB sensitive speaker and 200W of amp. If the noise level in your home is 50dB, that gives you a system dynamic range of 113-50 = 63dB. If the noise from your DAC is -100dB, improving to -110 dB is "measurable, not meaningful" because that noise is already so far below the noise floor of your system. Just like if wearing a certain type of shoe sole reduces your chances of being struck by lightning by 50%, no rational person is going to throw out all their other shoes. The improvement is measurable, not meaningful. 

So, you may find very minor improvements from reconstruction filters or analog line driver circuitry, That's for your ears to decide.

Far more likely, any improvements in your (very nice, BTW) system can be achieved through improved room acoustics. Far and away the weakest point in most systems. 

I have the Weiss 204 with a sbooster LPSU upgrade. I believe sound wise it was a substantial upgrade over the qutest (I have it for test with a upgraded power supply too) and the Weiss 204 with the LPSU is just a tad bit behind the Holo May KTE in resolution and a bit of nuance in the lower registers. Overall very happy with the Weiss and can recommend it without reservations.