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TOPIC: DDRC-24 - What volume to achieve 0.8v output?

DDRC-24 - What volume to achieve 0.8v output? 1 week 2 days ago #46614

  • flaviowolff
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Hello,
I'm running a power amp with 0.85v input sensitivity, connected directly to my MiniDSP DDRC-24.
I'm really bad at all the math :silly: , so I'm here to ask you guys: when using the MiniDSP as a DAC, at what negative volume does it output 0.8v? I dont have an oscilloscope to measure it.
Thank you!
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DDRC-24 - What volume to achieve 0.8v output? 1 week 2 days ago #46618

  • john.reekie
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www.sengpielaudio.com/calculator-gainloss.htm

The nominal answer is -8 dB. That would give 0.8V output with a full scale (digital) input. However Dirac Live will of course boost at some frequencies and cut at others, so this is only a very nominal calculation.
I am not miniDSP support.

"You must ask the right questions." - Dr. Alfred Lanning's hologram.
-> Have you read the User Manual??
-> Have you drawn and posted a diagram?
-> Have you posted a screenshot?
-> Have you posted your config file?
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DDRC-24 - What volume to achieve 0.8v output? 1 week 2 days ago #46625

  • Ultrasonic
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Bear in mind that a 0.8 V signal will still very likely end up with the output from your speakers being a lot louder than you actually want,
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DDRC-24 - What volume to achieve 0.8v output? 1 week 22 hours ago #46650

  • Tony_J
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Ultrasonic wrote:
Bear in mind that a 0.8 V signal will still very likely end up with the output from your speakers being a lot louder than you actually want,
Indeed. Probably a lot louder than your speakers want, too!
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DDRC-24 - What volume to achieve 0.8v output? 1 week 21 hours ago #46655

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john.reekie wrote:
www.sengpielaudio.com/calculator-gainloss.htm

The nominal answer is -8 dB. That would give 0.8V output with a full scale (digital) input. However Dirac Live will of course boost at some frequencies and cut at others, so this is only a very nominal calculation.

Doesn't Dirac apply attenuation to keep it's entire processing with no boost?
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DDRC-24 - What volume to achieve 0.8v output? 1 week 21 hours ago #46656

  • Tony_J
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flaviowolff wrote:
john.reekie wrote:
www.sengpielaudio.com/calculator-gainloss.htm

The nominal answer is -8 dB. That would give 0.8V output with a full scale (digital) input. However Dirac Live will of course boost at some frequencies and cut at others, so this is only a very nominal calculation.

Doesn't Dirac apply attenuation to keep it's entire processing with no boost?

Unfortunately, despite much railing at the @devteam in other threads, we have no accurate way of telling what corrections Dirac has applied, and it doesn't appear to keep the overall boost to 0dB. So it is a case of trial and error.
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DDRC-24 - What volume to achieve 0.8v output? 1 week 21 hours ago #46657

  • Ultrasonic
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flaviowolff wrote:
Doesn't Dirac apply attenuation to keep it's entire processing with no boost?

Sadly it is unclear and there is a thread in I think the SHD section which suggests it doesn't.

To add to Tony's post I'll just say that I think it is possible to tell pretty accurately what boosts have been applied by taking Dirac On and Off measurements in REW and dividing one by the other.
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DDRC-24 - What volume to achieve 0.8v output? 1 week 21 hours ago #46658

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DDRC-24 - What volume to achieve 0.8v output? 1 week 21 hours ago #46659

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Ultrasonic wrote:
To add to Tony's post I'll just say that I think it is possible to tell pretty accurately what boosts have been applied by taking Dirac On and Off measurements in REW and dividing one by the other.

That's a good thought - I will give it a try.
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