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And the S700's can be bought for attractive prices in some places.
The M700s are part of the Stellar series so perhaps that is where the "S" originates. I am referring to these Class D's for clarifications sake:https://www.psaudio.com/products/stellar-m700-power-amplifier/
In the Stellar M700, the Gain Cell drives a 700ASC class-D power module from the Danish company ICEpower. I asked Paul McGowan, CEO of PS Audio, why they chose this module rather than, say, one from Hypex, another class-D specialist. He said that they spent a lot of time listening to modules from various manufacturers, and the 700ASC was the one whose sound quality most closely matched that of the Gain Cell...
The S300 is a great amp with good reviews as well. I had it hooked up with Dynaudio speakers. You won't be disappointed for the $$. I have since traded the S300 in for the M700 mono blocks (then upgraded speakers) and am very pleased. I also use the PSA Direct Stream DAC. Good luck!
As the M700 is a class-D design, all measurements were taken with Audio Precision's auxiliary AUX-0025 passive low-pass filter, which eliminates noise above 200kHz that might otherwise overload the SYS2722's input circuitry. Without the filter, 877mV of ultrasonic noise was present at the speaker terminals, with a center frequency of 465kHz. (This is very similar to the Peachtree Audio nova300, which Art Dudley reviewed in June 2017 and which also uses an ICEpower module.)
Because of it uses ICEpower class-D modules...
The third harmonic is the strongest in the spectrum in Figure 2, and its level is low -90 dB; you can see the next odd, but already below -100 dB. In the high level of THD + N indicator (Fig. 3), this noise is involved, which makes the characteristics fall above the level of 0.1%, but in this case it is not a cause for great distress. It's good, pulse technique and here it came out with a shield, although it triumphs elsewhere - in C388.
The S / N value of 88 dB is particularly pleasing, as it is an impulse system. The low noise level and high output power create very high dynamics - 112 dB.The C388 also coped well in the difficult (for class D amplifiers) test of transfer characteristic (Figure 1), which almost does not reveal that we are dealing with such a construction. The characteristics for both loads are perfectly convergent, they fall gently already above 20 kHz, but the points -3 dB are determined only above 70 kHz.In the distortion spectrum (Figure 2), only the second harmonic lies at the limit of -90 dB, while the next one manages to see above the low noise spectrum, but it will be completely irrelevant.
I might add that I understand none of the graphs etc. at least as it relates to sound quality. What I do understand is how the 300 and 700s sound in my system. I also know the guys that build these and the testing, listening and manufacturing that went into them. There is nothing anyone on this forum or most others is going to "catch" good or bad that has not been reviewed buy the team at PSA after 40+ years experience. My opinion anyway. Lot's of great options out there- PSA is one of them and the 700s are getting killer reviews and that's is not by accident. Best and by far the most definitive test= try one in your home.
