Class D amps that are superior to all or most?

For the 9,999th time:

• Class D frequency response is determined by the load
• A particular amp can sound quite fine with one speaker
• The same amp can sound quite poor with a different speaker

ALL specific recommendations are worthless.

Its also impervious to weird speaker loads causing it to oscillate because its already oscillating!

However, the driven device forms part of the output filter and thus effects the frequency response. Tube amplifier frequency response also suffers driving widely variant loads. Depending on the interaction, the results can be chalk or cheese.

In all things audio, the whole system and the room affect sound quality.

I think you might have a misconception here! Its true that the output filter is affected by the load. But it won't change the FR significantly because of two factors. First, the load affects the Q of the filter. What this means is with lower impedances the filter broadens a bit and is less effective- so you might see bit more of the residual (sine wave at the switching frequency). The second is that in a self oscillating amplifier there is so much feedback that phase shift and the audio passband FR are unaffected. Quite literally there's enough feedback to correct for issues that might arise if the filter is operating at a lower Q.

Methinks not.

Class D Output filters are load dependent.
From TI:

The LC filter response also varies with speaker load impedance. The load impedance determines the damping ratio of the output LC filter and is classified as overdamped, critically damped, or underdamped. It is also important to understand the speaker load impedance variations for the application and select the L and C values that suit the expected load variations. Ideally, the LC filter value is selected for a critically damped, flat passband, and phase response. Two considerations when selecting components for the second-order low-pass filter is the cutoff frequency and Q factor or damping ratio.

The variations can be small, but they will vary with every load presented. Hence, the perceived sound of the amplifier can vary with each speaker.

This Stereophile image of PS Audio's Stellar M-1200 shows it well damped and relatively immune to load variations. https://www.stereophile.com/images/1220PS1200fig01.jpg

Ditto this Schiit Aegir https://www.stereophile.com/images/919SchAegirfig01.jpg

Not so much this new Mytek Brooklyn AMP+ https://www.stereophile.com/images/421Mytekfig01.jpg

Making a purchasing decision based on the written word is folly. Doubly so for fan-boy recommendations.

I'm not knocking Class D. I have one driving the woofers in my tri-amp system.

frequency response does not vary with load...

Define load.

Non inductive load resistor, speaker simulator or something like this Elac Debut B6 https://www.stereophile.com/images/416Elacfig1.jpg. or Klipsch Forte III https://www.stereophile.com/images/719KF3-fig1.jpg

@atmasphere 
Your post began stating I have a misconception. I have no misconception of Class D, filters or Q.

There is little change for some products as I showed. For others there is a lot.

Designers debate the value of under, critical [for design load impedance ONLY] and over damping. Hence the wide FR variation among competing Class D products. Class D products VARY MORE into varying load impedances than do typical transformerless solid state amplifiers.

Hence my caveat that fan-boy recommendations are just so much twaddle.

Feel free to post unfiltered frequency response graphs of a Class D amplifier that maintains identical flat output amplitude into several 'rollercoaster real world impedances'. I've yet to see one.

NOTE: I only mention FR as it is relatively obvious and most comprehend it. Not so much for IM, THD and dynamic distortion spectra.

We've measured no change in bandwidth of our prototypes and Beta units from 20Hz to 20KHz

I don't think I ever mentioned bandwidth. BW is not FR. BW is how far. FR is variation over BW. Some amplifiers drive test loads ruler flat and reactive loads not so well.

fan-boy: "I have a GigantaRama driving BrontoSpheres and it's great."
Frequently, not.

^^^ from?
Monitors used to eval?

There was less bullsh!t in the 50's & 60's 

But you will need a warm/musical/tube preamp to tame the high (easily bright on many tracks) and lossen the low (can be too tight and fast).

Sticking something in front will not solve the issue which is between the amp filter, the cable and the speakers.

Bass can never be too fast.

If the amp does not mate well with the speakers, change one.

In addition, capacitor life expectancy is affected also by electrolyte consumption due to leakage current during voltage application.

IOW, listening 2hr/ eats the electrolyte 12x

they are the used cars salesmen of audio

Worse.

With a UCS, at least you got a car, condition somewhat indeterminate.

Some here are peddling pure ephemera.

As Ric says,  the caps will still last 15 years or so! No worries. The caps are cheap to replace folks.

And all the while the sound degrades as you boil away the electrolyte.

IMO, as a design engineer, replacing caps is not a mod. While it may alter and in some systems improve the sonics, it is at best transitory.

Electrolytic capacitors begin degrading from the moment they are made. In today's marketplace, the cap you buy today may or may not be identical to the one you bought last year, even if it is from the same manufacturer and the same µF & V.

I have a NuPrime ST-10 Class D. It drives the woofers only. I tweaked it a bit by venting the case, adding a tiny fan and removing the balanced input. Before the venting, the amp became a bit nasty once the case hit 40°C. Not no more.

I redesigned my Tubes4HiFi M-125s [mid-range only]. In the PSU, I replaced the underrated [suspect] Nichicon 75µF with a bank of 6  genuine UCC 330µF and a soft start. On the driver, under voltage 400V with 550V.

The first is a mod, the second a correction.

I've been actually modding HiFi gear since the 60's. Replacing caps ain't it.

AND there is no SONIC difference between leaving SS equipment on all the time and powering it on and letting it warm for ≈20 minutes EXCEPT THE 'LYTIC CAPS LAST A WHOLE LOT LONGER! And thus the sonics persist.

Other than Class A, SS gear is always sonically vacillating as the thermal operation point changes with the program.

I should mention that new gear got powered for a full week before listening. Amps got a 24hr 10% power burn-in on a load.

I travelled overseas a lot, sometimes for several weeks. ALL gear off and unplugged. 24 hour toast up upon return, then back to 20 minute warmups