1 (edited by cake2pai 2018-01-04 06:55:43)

Topic: question about eq.

hello

I heard that digital eq has a phase change problem.

But if it works before the dac & in the linear phase

I heard it was okay.

So I'm curious.

1. eq work in a linear phase?
(need to set sharp filter?)

2. eq work before dac?


And other questions.

usb-b -> adi-2 pro ->  poweramp

Does it work as a preamp?

Or does it work as a dac?


Thank you for your reply.

2 (edited by ramses 2018-01-04 07:35:32)

Re: question about eq.

to 1) Can you pls give references (URL) or explain this a little bit more ?
Whats the exact impact for your work ?
According to schematics in handbook chapter 34.3 the EQ is before the DAC.

to 2) the ADI-2 Pro has symmetric and asymmetric outputs, your poweramp should have equivalent inputs.
Which poweramp is this ?

BR
Ramses
Win7 Prof, CubPro9.5, UFX+, XTC, ADI-2 Pro FS/DAC, RayDAT, ARC USB, Sonnet USB3-PRO-4PM-E

3

Re: question about eq.

cake2pai wrote:

I heard that digital eq has a phase change problem.

The phase change is the same as with analog EQs and in 99% of the applications no problem at all.

cake2pai wrote:

But if it works before the dac & in the linear phase I heard it was okay.
1. eq work in a linear phase?

No. If you research the topic (just needs a little bit Googling) you will learn that Linear phase requires a lot of latency to work precise and in good quality, and is therefore only used in specific moments where such a feature is required - and mostly found as software solution.

cake2pai wrote:

2. eq work before dac?

How can a digital EQ work AFTER a DAC? Where the signal is analog? (I'm really missing the facepalm smiley...)

cake2pai wrote:

And other questions.

usb-b -> adi-2 pro ->  poweramp

Does it work as a preamp? Or does it work as a dac?

It works as both. It might be helpful to read the product description and manual, available on our website.

Regards
Matthias Carstens
RME

4 (edited by cake2pai 2018-01-05 00:32:24)

Re: question about eq.

Thank you for answer ramses and mc.
I'm sorry I do not know well about the audio processor and english.
I was bothered with bass boosting(+20db).
The bass trap failed.
The only remaining method was eq.
But I heard many negative opinions about eq from hifi.
Then I found this.
http://www.audioforum.co.kr/bbs/board.p … mp;page=29
It was written if Linear Phase eq works before the dac, there is no problem.

So I found adi-2 pro and bought it.
But manual was not translated.
So I tried to translate the manual into Google Translator.
But it failed.
And Of course I saw the dsp/dac in the picture.
But I could not be sure of this picture.
So I needed an expert answer.

And I am using this now.
shieldtv  -usb-b-  adi-2  -spdif(optical)-  8300cd(preamp)  -xlr-  8300mb(poweramp)

There is a small problem.
A window about the connection was posted every 3 to 5 minutes.
So I set it manually and decided to remove 8300cd(preamp).
(Of course I saw the picture of the manual(preamp: analog-analog).)

And I asked a question in my country.

q. 'If the input is usb, does adi-2 work preamp?'
a. 'yes'

So I remove 8300cd(preamp).
But adi-2 does not work in preamp mode.
It only works with usb mode or dac mode.

So I was confused and asked a question here.

5

Re: question about eq.

Your english seems decent enough to read and understand the english manual. If not we will indeed get a communication problem, as details are needed to give clear answers. For example: what is your definition of 'preamp'? When connected to USB you can still manually set the ADI-2 Pro into Basic Mode Preamp (AD to DA pass through). From your words I don't know why you either overlooked this mode or why it doesn't work for you.

What 'window' was 'posted'? Did you set the clock source to SPDIF input when you want to hear SPDIF? DAC mode does that automatically, other modes not.

Regards
Matthias Carstens
RME

Re: question about eq.

Thank you for the reply. And sorry.
I am using Google Translator.
This is not perfect.
Some words are omitted, and meanings change.
I know.
So I tried to translate the manual and gave up.
I will look for the answer myself.

Re: question about eq.

cake2pai wrote:

Thank you for the reply. And sorry.
I am using Google Translator.
This is not perfect.
Some words are omitted, and meanings change.

Hi cake2pai.

I'm guessing you are translating from japanese, but i think i can help you!

The word "preamp" has a different meaning in the Pro-Audio vs. Hifi world. The "Preamp" mode is an easy way to use the analog inputs on the ADI-2 Pro, but you should use DAC mode. The volume control on the ADI2P will perform the same function as a (hifi) preamp. This is also the only way to get the true sound of the ADI2P by using its DA converters instead of your old preamp. Start by setting the output reference level to +4 to use the full range of the unit, or use the "Auto Ref" mode if you don't feel +4 gives enough volume on your system.

In general linear phase eq is only a good choice when you have to mix different audio sources, and phase-coherency is important - an example could be a crossover filter. But - linear phase has other problems which would be very obvious if you were to make a 20db adjustment. Please use google "linear phase pre ringing" for more information on why linear phase is a bad choice for your problem.

Enjoy your ADI2 Pro! (^^ )

*i assume the "window posted" thing means an audio interruption.

8 (edited by cake2pai 2018-01-09 06:45:11)

Re: question about eq.

Thank you for answer Basken.
That was the answer I wanted. Thank you very much.
And I do not speak Japanese, but the sentence structure is similar to Japanese.
And "window posted" is
https://imgur.com/a/hurC4
This window pops up every 3 to 5 minutes.
Maybe it seems to be related to the shieldtv's signal.
Thanks to you, my worries are over.

Re: question about eq.

You are very welcome; happy to help smile

Just to make sure i understand: if you set the Adi2-Pro to DAC mode, does it switch automatically to PreAmp mode every 3-5 minutes?

10 (edited by cake2pai 2018-01-09 23:18:35)

Re: question about eq.

ust to make sure i understand: if you set the Adi2-Pro to DAC mode, does it switch automatically to PreAmp mode every 3-5 minutes?

no. It appears when set to auto mode.
So I set it to usb or dac mode.
Then this pop-up will not appear.
Again, thank you very much.