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Which digital input to use? Technics SU-R1000 or Technics SL-G700

First of all let me start by saying I've been an avid reader of the forums for quite some time but this is my first thread...

I have both the Technics SU-R1000 (Integrated) and the Technics SL-G700 (CD / SACD & Streamer).

I am using a Raspberry Pi running Roopieee with audio going out through a HiFiBerry Digi+ hat (optical).

I use this for Tidal / Qobuz and also my own digitised CD library.

I know that the  SL-G700 uses a dual mono DAC circuit (AK4497 from Asahi Kasei) but I am unsure of what the SU-R1000 uses.

Question is, which input should I be utilizing?

Digital in to the streamer with analogue out to the amp
Digital in to the amp 

Any opinions appreciated!

Thank you. 
stephencowslip
ricevs
1,543 posts
 
There is no DAC in the Technics machines.  It is a PCM to PWM converter......done in software.....same as the original TACT Millennium and all the current Lyngdorf amps.  The A to D converter is an AKM as shown in their literature......not a Burr-Brown.....unless they had to switch to Burr-Brown because the the fire at AKM factory.
nonoise's avatar
nonoise
10,823 posts
 
As a tribute to the Technics engineers, there’s a lot going on inside this box. It is a credit to their talent that this is no mere chip amp, or basic A/B amplifier, especially for this price. This amplifier is built like a ten-thousand dollar amplifier, albeit a little different than what a lot of you might be used to. The SU-G700 is a digital amplifier. Digital sources stay in the digital domain all the way through, while analog sources are converted to 24-bit/192kHz digital by a Burr-Brown 1804 A/D converter. Keep in mind that anything connected to one of the two analog inputs (including phono) is also converted to digital.
That is from a Tone Audio review and
Analogue input is converted with high precision to a digital signal by the high quality 192-kHz/24-bit A/D converter [Burr-Brown PCM1804 (Texas Instruments)], so the high-purity sound reproduction capability of the full-digital system can be maximised in playing back analogue sources. High-definition switching relays are used for signal switching
.
This is from Technics own website. It's always been the BB 1804. The AKM DAC is used in their SACD/streamer player.

All the best,
Nonoise

ricevs
1,543 posts
 
The Technics website says the 1000 has an AKM A/D and shows a picture of the AKM chip......see the link George provides.  Tone Audio review and the other thing you quoted is about the 700.......I am talking about the latest and greatest 1000......so the older 700 is using Burr Brown and 1000 is using AKM.  Not very important.....as every single thing inside something makes the sound.  The Technics 1000 seem to sound very good.....but I don't see any "this is state of the art raves".  Too bad, I was hoping the 1000 would kill everything.  Thank you Technics.....next....he he.   
georgehifi's avatar
georgehifi
10,312 posts
 



The Technics SU-R1000 has 6 x digital source inputs 2 x rca coax and 2 x Toslink optical. And from the looks 2 x mini usb type B? as well https://ibb.co/V20b4D2

And uses the Delta Sigma AKM AK5572 D/A converter dac chip.
https://www.akm.com/content/dam/documents/products/audio/audio-adc/ak5572en/ak5572en-en-datasheet.pd...

It can be used as a stand alone poweramp (MAIN IN)
Or a standalone preamp (PRE OUT).

Even the converted digital can be accessed as analog from the "rec out rca’s"
So it can be used as a stand alone dac also.

Cheers George
ricevs
1,543 posts
 
Get it right George......the AD 5572 is a A/D converter.....not a D/A converter. There is no D/A converter (DAC) in any Technics...they are pure digital amps.....pcm to pwm conversion done directly by software.

The A/D converter is used to turn the analog signals into PCM signals......then the software turns it into PWM....unless the input is digital......the it is pure PCM to PWM.....and no A/D is needed.
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