[maty]

Class AB with very good SNR, the new Marantz PM8006.

[Polish review] https://audio.com.pl/testy/stereo/wzmacniacze-stereo/2911-marantz-pm8006

to English with Google

https://translate.google.com/translate?sl=pl&tl=en&js=y&prev=_t&hl=en&ie=UTF-8&u=https%3A%2F%2Faudio.com.pl%2Ftesty%2Fstereo%2Fwzmacniacze-stereo%2F2911-marantz-pm8006&edit-text=

    Rated power (1% THD + N, 1 kHz) [W] 8 Ω, 2x 80
    Rated power (1% THD + N, 1 kHz) [W] 4 Ω, 2x 119
    Sensitivity (for maximum power) [V] 1x 0.23
    Signal / noise ratio (A-weighted filter, with reference to 1W) [dB] 90
    Dynamics [dB] 109
    Damping factor (relative to 4 Ω) 87

On the other hand, the record falls in a distance-to-noise discipline; here PM8006 outclassed the rivals, achieving one of the best results among all integrated amplifiers - 90 dB.

A good and much expensive class D poweramp must be better than the Marantz (SNR and harmonics profile). Why not?

[maty]

http://www.audiocircle.com/index.php?topic=58526.msg1675334#msg1675334

Cherry amplifier

SNR calculation. Easy and fast.

400 watts/4 Ohms -> SNR: 120dB. V=40v


with 1 watts/4 Ohms V=2v

 -> 120dB - 20log(40v/2v) = 120dB - 26dB = 94 dB


to compare

1 watts/8 Ohms -> 91 dB


With class AB, 91 dB is very good. With class D is only good, I think.

[maty]

An example to make me understand.

You buy the engine of a Porsche and create a beautiful chassis body for it but the tires are narrow, of those used in mid-end cars.

What good is that great engine if the wheels severely limit the performance of the vehicle?


* engine = very good class D module

* tires = buffer with bad? design and poor quality control

[AJinFLA]

[maty]

Stereo Magazine issue #14  pages 38, 39 and 40

https://stereo-magazine.com/flipview/epaper/stereo-magazine-2018-14/

Marantz PM-10 with 2+2 Hypex NC500OEM. Only € 8000.

The SNR at 1 watt is about 80 dB   

Marantz, like PS Audio, also spoils the performance of an excellent class D module.

[OzarkTom]

Have you listened to these Maty?

[maty]

I wrote about specs.

Hypex NC500 OEM v2

At max power:

* SNR 135 dB -> 137 dB "A weighted"


At 2.83 Vrms aka 1 watt 8 Ohms

* SNR 110 dB -> 112 dB "A weighted"


At least Marantz does not add nasty H3 harmonics like PS Audio.

[OzarkTom]

And what does specs sound like?

Any speakers with less than 5% distortion on the market? 10%? 20%?

[maty]

SNR != distorsion

[fredgarvin]

The SNR at 1 watt is about 80 dB   

Marantz, like PS Audio, also spoils the performance of an excellent class D module.

I wonder if this is not intentional by Marantz to achieve a certain voicing. Something akin to their traditional laid back sound.

[maty]

The own buffer and the PSU must be the Marantz problems.

32 dB less are much dB. There must be several causes.

Usually the voicing is mainly via harmonic profile.

[rollo]

  AJ I'm still laughing BRILLIANT !!!

charles

[fredgarvin]

The own buffer and the PSU must be the Marantz problems.

32 dB less are much dB. There must be several causes.

Usually the voicing is mainly via harmonic profile.

True, I suspect the buffer as well. I had a recent Marantz integrated and the sound was very disappointing.

[rollo]

  Back in the day when the Japenese Receivers were all that the specs were great. However sounded like crap. Go figure.


charles

[fredgarvin]

  Back in the day when the Japenese Receivers were all that the specs were great. However sounded like crap. Go figure.


charles

I always contributed that to too much global feedback used in chasing low distortion numbers.

[Elizabeth]

I own the Marantz SA-10. The pictures in the 'photos with specs' of PM -1- and SA-10 above  are reversed.

I only bought the Marantz SA-10 after my dealer let me audition one at home for five days.
There is no way anyone could have told me I would buy a $7000 SACD player just a month ago.
The main thing I like is the SA-10 has digital inputs.
So I can use it with my CD changers and CDs also sound much better through the SA-10
The better CD sound is the primary thing that sold my on the Marantz.
I own like ten SACD by accident. And 2500 CDs.

[OzarkTom]

  Back in the day when the Japenese Receivers were all that the specs were great. However sounded like crap. Go figure.


charles

+1

Some here must have missed the spec wars of the 70's. Any tube amp sounded much better than any low spec receiver. I even fell for that one.

[maty]

Class A or class AB != class D. The technology is very very very different. And there are very different class D technology too.

Class D likes very much "tons" of feedback.

Before commenting publicly, it is better to inform yourself before.

https://en.wikipedia.org/wiki/Class-D_amplifier

[Canada Rob]

For years I have been into tubes and still love them, but my current financial situation precludes me owning a tube amp.  I have Omega Compact Alnico Monitors and the only amp I have is a TPA3116 that I had put in a nice chassis, so being it was all I had, I set up my system with it and love the sound.  Great low level dynamics, texture, speed, and imaging...and enough power if I want to listen louder. 

Back around 1990 a salesman in Sound Hounds in Victoria, B.C. said regarding audio gear "if it sounds good, it is good".  Regardless of price, if it sounds good, it is good.  NAD proved that with their 3020 decades ago, and are doing it now with their Class D replacement, the 3020D & D2.  Bob Brines of Brines Acoustics who is highly respected on AC uses a TPA3116 based amp among others.

Back around 2013 I tried a small Class D amp and hated it so much I returned it for a refund, and never took Class D seriously until Wind Chaser had me in his home to hear his excellent sounding Class D based system.  On top of that, he gave me a brand new TPA3116 board to play with, which is the amp I currently have in my system.  Thank you John.