Amplifier brand/designer with the most unique and consistent “house sound?”

What is house sound?
I mean that a amplifier can be made much more linear and do not deviate as much from a flat line as a speaker does. That has more swing up and down from any kind of line.

I thinking if we want to deviate from a horizontal line with for example more bass and more highs so we get a smiley curve.

If a manufacturer consistent make amplifier that make a in this example a smiley curve.
Is that a definition that that manufacturer has that house sound i guess.

Or is the definition of a house sound something completely different?

Thanks atmasphere for your explanation!

I am currently playing with a power amp clone of pass ACA 5w+5w (someone measured it to 4.5w before clipping on a oscilloscope)

Why? Of two reasons:
# Amir on Audio Science Review measured the real ACA and it is the WORST measuring amp he probably has measured..
In the same time there is MANY testimonials from owners that loves how it sounds.. 
(This is a power amp that has a lot of 2nd harmonics)
I got fascinated of HOW we can have a amplifier that divides one group that thinking it is do BAD that it is not even worth to power up.. and then there is another group that says it the best thing after sliced bread! 🤔
I got to try it out and listening for my self!😉

# The second reason were i have never tried a class A amplifier and wanted to hear what the fuzz was about..

It would be interesting to compare ACA against a ncore. NC400 that is on the other end of the scale and is one of the best measuring amps.

I guess that NC400 is one of those amplifier without any house sound with almost no distortion at all.

OK mikem
If i understand you correctly you are not talking about deviation from the flat line along the frequencies.

When you mentioned PASS so what i think I know is that at least in the first watt case its "sound" is coming from more or less amount of harmonics of different orders depending on amp and amount of feedback.

So some like more 2nd harmonics and says that the amp sounds great, when others will even almost not want to turn it on to listening to the same amp, when it has according to measurements not and them to high distortion (as harmonics are).

So House sound is the amount of distortion/harmonics. Or maybe it can be both deviating from flat line AND have more or less harmonics?

I didn’t choose my amp based on specs or types of supposed distortions.. but what it sounds like in my system..  

And there is someone like me that choose the worst measuring amplifier that i could find!

If we say like this: that amplifier in my dedicated 2ch symmetrical and treated room sounds actually great.

But if we for one second imagine that the worst measuring amplifier sounds actually "good".

Then maybe we can start to reflect over how much or little measurements actually says about sound quality?!

OK I will go out on a limb here and post a YouTube video of my system playing a track captured by my crappy phone (maybe some sound quality is preserved somewhere to indicate that a clone of pass ACA with <5w/ch that measure terrible)

"Enjoy":
https://youtu.be/_zHy37X192g

@mikem thanks for the insight and your kind words.
Good sound you have there! 😀🎶🎵