Output and input Capacitors value

[slowikpl]

Hi all. I have a question about the best value in uF from capacitors. I have some leftovers from recently speakers upgrade for duelund capacitors.

I have kindled Supreme S/O , Rike Scap and Audyn True Copper.

Now in my DIY DAC as wel in my DIY Amplifier are used

Mkp 1.44/2 sw value: 10 uF

2 Pcs Arcotronics 10?F 250V 5 MKP Polypropylene 1 44 2 SW Capacitor 10uF 10 Uf | eBay

In dac XLR output 4 pcs what should be the best value


And

Input XLR on my monoblocks.

I wan to have some better ones then now.
Have you any suggestion?

 

[DF96]

The appropriate value for a coupling capacitor depends on where it sits in the system as a whole, what LF rolloff you want, what resistance it feeds etc. So there is no such thing as "the best value for an input cap".

 

[slowikpl]

System:

Dac 500 Ohm impedance output -> Pass Aleph P Pre -> Amp 50k Ohm input.

Some advice?

 

[DF96]

For a coupling cap feeding a 50k input resistance the value depends, as I said, on what LF rolloff you want and whether this particular cap is the one which sets the rolloff.

If you want a 10Hz rolloff set by this cap then 0.47uF will give you 6.8Hz.

If you use a 10uF cap then the rolloff here will be so low that you can quite safely use an electrolytic. It will have very little signal voltage across it so it can't create distortion.

Crossovers are different: as filters they are intended to have signal voltage across them so better caps are necessary.

 

[slowikpl]

Hi . Thanks for the info. I'm not that good in English and let's not begin with technical aspects. I do not want the 10uF caps because of the Space I need for them. Duelunds are way bigger than the original 10uF caps.

But in other words:

If I Put in my Amp 0.47uF cap on XLR input (2 pcs capacitors) should it be enough to get 6.8Hz roll of. So thats super news. The 0.47uF like V-cap or Duelund will fit there.

And what about my DAC with 500 Ohm output?

 

[DF96]

What will the DAC feed? The output cap from a source depends mainly on the resistance of what it will feed.

 

[slowikpl]

My Aleph P Pre will be used to connect DAC and Mono Amplifiers.

Output Impedance
0 - 1000 ohms unbalanced
0 - 2000 ohms balanced

Input Impedance
10 kOhm unbalanced
20 kOhm balanced

 

[DF96]

10k input needs 5 times the cap value for a 50k input.

 

[slowikpl]

Thanks for your time.

So in my words:

For my Monoblocks i need 0,47 uF for the XLR Input Cap?

And for my DAC I need at least 2,35uF for the Output Cap ?

Correct me it I’m wrong.

 

[DF96]

One thing I forgot to say: the total capacitance (i.e. the series combination of output cap from source and input cap to load) must be enough to ensure the LF rolloff you want.

This often means that source output caps are a bit larger than amp input caps, as the source designer can't know what input resistance it will have to feed.

You are asking me to make design decisions for your DIY. I can't do this, as I don't have the complete picture of your current setup and whatever you might choose to do in the future. You need to learn about first-order CR filters (high pass in this case) and make your own decisions.

If in doubt, leave things as they are. There is no advantage in re-using passive crossover caps as coupling caps.

 

[slowikpl]

Hi.

I want to change The caps to me Duelunds DC 2.2uF i have spare on me DAC output. Can somebody please tell me it my 2.2 Duelunds will be ok for this task?
I made a 20Hz test very loud and there was no bearable difference between 2.2uF and added additional 5uF. So I'm ok ?

My setup:

DAC DIY

Preamplifier: Pass Aleph P
Impedance:

Pre input: 20 kOhm
Output. : 0-2000 Ohm


Amplifier:

Pass Labs XA 60.8
Impedance :

Input: 100kOhm