Filter brewing for the Soekris R2R

[living sounds]

Just imagine the improvement you would experience if you remove both the 5532 (shock, horror) and the transformer. When i think about it i really envy you 🙂

Most of the music you can buy and listen to went through a small mountain of 5532/5534. Nothing wrong with it, though I wouldn't recommend the Texas Instruments variant.

And most studio people love transformers... ;-)

 

[living sounds]

What sits after your DAC in the chain?

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Like I wrote, the DAC currently goes directly into the power amp, no passive attenuator.

I went through the filters via a headphone amp some time ago and didn't like the linear filters either, BTW.

 

[baten]

Some people just prefer NOS! Not sure about transformer coupled vs op-amp though. I only own one jensen transformer coupled DAC and it does sound quite nice.

 

[TNT]

Have you tried running the DAM straight out if the ladder into the power amps? No OPamps, no trafo. Just 600 ohms resistive out.

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[living sounds]

Have you tried running the DAM straight out if the ladder into the power amps? No OPamps, no trafo. Just 600 ohms resistive out.

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No, the power amp is not designed to receive unbalanced signals. I could try connecting ground output to - input, but it's not ideal. The transformer is a known quantity to me, I have designed circuits around it before and it measures the same in terms of frequency/phase response and better than the balanced output regarding distortion. I checked this yesterday and was able to null both signals pretty well. But the op amp output exhibits a high end harshness that shows up in the differential signal.

 

[TNT]

Aha - I see. Well,I I would try that!!

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[sajunky]

Ok, just curious... so after installing the transformer, you changed your preference for filters?

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I can confirm from my past experience that zero feedback amplifiers in the output stage can also change preference of DAC filters.

 

[Peterma]

Hi tnt I really liked your last filter, can I still use it after I have updated and installed the 4K firmware for dam1121 firmware and filters rev 1.21?

 

[baten]

Hi tnt I really liked your last filter, can I still use it after I have updated and installed the 4K firmware for dam1121 firmware and filters rev 1.21?

Pretty sure that, no..

 

[TNT]

I think so, it's based on the latest filter file format but the filter only utilises 2k of the 4k possible taps.

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[Peterma]

I will try and put in back because I like it better than the stock 4k one that comes with the latest vers, I mean I like the sound of the current one but to me there is a strange feeling that instruments are pushed forward overshadowing the artist at times.

 

[TNT]

You run my filter on a 4k enabled DAM?

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[baten]

I think so, it's based on the latest filter file format but the filter only utilises 2k of the 4k possible taps.

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Ah, got it.

 

[Peterma]

You run my filter on a 4k enabled DAM?

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yes im going to try it

 

[Peterma]

have to remember how to again its been a while since i did it

 

[TNT]

Well, its basically the same as upgrading.

You connect

Hit +++

Enter: Download

-> point to a filter file (instead of an firmware file...)

Check for compleation/success.

Power cycle..

Verify by doing command: Filters

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[Peterma]

thanks so much thats great help

 

[Peterma]

hey can you tell me what page number your last filter link page number is on?

 

[TNT]

#1803 with DC filter, #1833 without.

If in doubt or you don't know/understand... -> #1803.

You dont read the thread? 😉

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[Peterma]

Thanks again, my memory isnt as good as it used to be, guess thats part of getting old.