for a 10k pot, the series resistors should be 10k, and then calculate the other resistor for

the attenuation you need

Sorry, I feel a bit stupid, but I don't know how to calculate. For the online calculators you need to know the output impedance.For a -10dB what value will suit?

http://www.uneeda-audio.com/pads/

Edited January 18, 201511 yr by Laowei

Thanks Laowei, I will give it a try, but first I have to study it.

Just use digital domain attenuation on the DAC.

Just use digital domain attenuation on the DAC.

Don't know how to do this with the Gungnir .

 

 

I am not sure about the calculations.

With the 10k series risistors I calculated for -10dB 9.25k for the parallel resistor. Are these a reasonable values?

Just use digital domain attenuation on the DAC.

 

Exactly my thought.

 

HS

Digital attenuation leaves artifacts, even at 32bit depth and 64bit computation. I too was a sceptic before I heard with SR-009.

http://www.parts-express.com/in-line-xlr-attenuator-pad-10db--240-412

Thanks Laowei,now I understand what Kevin meant with the Neutrik connector. The problem is I don't have enough space behind my amp.I already use angled connectors. Besides I think it is a bit overkill.I only need 6 resistors to attenuate the signal. I have done some new calculations: line input 10k, attenuation 10dB, R1 & R2 2700 ohms, R3 3300 ohms.

The DAC is a Schiit Gungnir.According the specs it is maximum output XLR 4.0V RMS

 

This has been an interesting exchange.  I checked my Beresford Caiman MkII and it puts out 2.0Vrms so I think I'll be in a better place with my KGST.

 

HS

I'm using a Gungnir in 4V balanced output too. It's truely a balanced circuit directly from the differential DACs, not an afterthought.

With a Gungnir, one could always easily go to SE output at 2V and get a -6dB attenuation.

The 50K Alpha pot in my KGST is at about 8:30-9:00 for a realistic volume level. I just bought a 4 gang Alps RK50 from Justin to try out on my next build. I may try some attenuation before it with some Vishay TX2575 resistors to give a more useful range of adjustment.

Edited January 19, 201511 yr by Laowei

After work I have done some soldering. This site gives lot of information http://www.sengpielaudio.com/calculator-voltagedivider.htm. I made an attenuator with resistors I had by hand.I used circuit B .With two 10k seriesrisistors and 5.6 parallel. The attenuation should be 11.5dB. I think it can even a bit more. 12.00 o'clock is now OK with classical music, but much too loud with modern pop music.Older pop music is not so loud.

This is DIY. The other stuff is just kit building

I tell people if you aren't constantly using ohms law when doing a DIY project, it's not DIY. Ok, I don't tell people that, but just told you guys here and now

Circuit B should show 1/2R2=R2*0.5 for each of the "R2" to ground, if it is to give the same attenuation as Circuit A. 

The drawing is from DIY. There was a discussion which circuit is better.(B they say).I used the online calculator in the link.

I prefer A.

B requires more parts=more part matching. 

I prefer A too.

Balanced input (opposite polarity signals) are referenced to each other, and ground is not referenced.

http://www.diyaudio.com/forums/analog-line-level/266052-passive-balanced-attenuator-between-pre-power.html

that depends on whether the output is true balanced or ground referenced.

 

true balanced may cause interesting dc level issues releated to common mode.

Greetings to the entire collective of Head-Case.org, this is my first post and I want to take this opportunity to introduce myself.

 

I write to you from Spain. Long time ago I use headphones, but just three years I have serious devices, the same time that I am a member of the best forum headphones in my country. In fact I see some familiar faces here .

I have academic background in electronics and electricity and have interest in DIY projects developed in this community, especially the electrostatic headphones amplifiers, in fact want to start building a KGST.

I ask you to forgive my English, is very bad and I'm sure many will say stupid things, I hope not to bother too much with them.

 

Also take this opportunity to thank Remolon for discover me this project, Jose for encouraging me to build and especially to Headinclouds for providing me purchase of the material. To all of them thank you very much friends.

 

Nice to be here with you.

Fernando

Welcome Fernando

Hi there

Hola, Fernando

Wellcome Fernando!

Lux Aeterna.

Hello Fernando!