Would I be wasting my money to get a turntable?

I am  shocked by some of the misunderstanding about class D out there. 

Jerry

@carlsbad2 Tell us more.

@glennewdick

there is no digital (I.e. code) in a class D amp, period. your confusing the differences here.

I’m sorry, but the one who is confused is you. The technique used in class D (which I agree does not stand for ’Digital’) is the same PWM (or other pulse-based modulation) used to convert an analogue signal into a digital stream for CD or other digital medium and back into an analogue format. Neither more, nor less. If there are ’digital sound quality’ issues due to quantization or filtering, they would emerge in this transformation neither more nor less than in an ADC converting an analogue signal.

The fact that potentially the only operation performed on the pulse stream so obtained in a class D amp is amplification, and it is not treating the digital stream in other ways, is neither here nor there: they are 1s and 0s whether you like it or not: the transistor is either saturated or cut-off, and in fact any use in the linear zone is not only not-favoured; it is discouraged and unwanted. The analogue signal is not recoverable unless you use the same techniques to demodulate and filter the pulse stream that are used in a DAC (obviously with much higher currents and voltages, but again that is irrelevant).

I’d suggest you get a degree in EE, then perhaps we can google together from the same basis of understanding.

What do you call the conversion of an analogue signal to a PWM/PDM or ΔΣ modulation and its subsequent filtering to recover an amplified analogue signal? Because if that’s not digital, then CD is not digital and streaming is not digital either. However, that’s exactly what happens in a class-D amp, at some point. The filtering is at the very end, but the signal conversion can happen at the amp input or just before the final (current) amplification stage.

In class D amplifier "Voltage" is converted to "Duty Cycle", both analog - meaning there is no discrete steps (unlimited resolution).  Duty cycle is back-converted to (amplified) voltage by filtering.  Streaming and CDs both have limited resolution (16 bit in CDs).

Guys we are an NAD dealer the m33,does indeed digitize an analog signal in order to use DiRAC Room Correction for all sources.

so your answer is the analog input will sound different then streaming but if you want to hear the best in analog I would trade in the m33 and go up up to the nad M66 which has a true analog Preamp as well as an improved dac.

Dave and Troy Audio intellect NJ

Nad masters  dealer

In class D amplifier "Voltage" is converted to "Duty Cycle", both analog - meaning there is no discrete steps (unlimited resolution). Duty cycle is back-converted to (amplified) voltage by filtering. Streaming and CDs both have limited resolution (16 bit in CDs).

What happens when your PWM’s oscillator signal frequency is not high enough? Who determines what frequency is "enough"? The resolution is not infinite unless the frequency is infinite (impossible). This is at least vaguely analogous to the sampling rate in digital quantization. Then you have the output filtering to smooth out artifacts from a finite frequency oscillator, and this is analogous to that phase of DA conversion.