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TOPIC: DDRC-88A: 8 channel analogue input/output Dirac

DDRC-88A: 8 channel analogue input/output Dirac 4 years 5 months ago #17430

  • keith2014
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Can someone please give me a definitive and straightforward answer to this:

I am using as Denon X5200W AVR and Emotiva amplifiers.

How do I set the jumpers on the 88A and how do I set the dipswitches?

The analog rated output for the Denon is 1.2V and the rated input for the Emo amps is 1.1V.

Thanks.
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DDRC-88A: 8 channel analogue input/output Dirac 4 years 5 months ago #17446

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stephenting99 wrote:

devteam,

Help me understand your reply on the mixed input scenario that been described above.

So for each input channel (say channel 1), it can have either balanced or unbalanced input? This is okay.
What is not okay is having both balanced and unbalanced inputs connected to the same channel 1.

What about the outputs? Are both the balanced and unbalanced outputs active at the same time? In this case output of channel 1.

Hello,

Somehow we completely missed that post! Sorry for that.. :-)
The input/output is quite simple and you indeed have it right.
- You can "NOT" input a signal to both the Unbalanced and Balanced input of the DDRC-88A. The reason is a loading issue and that really you'd be "mixing" 2 signals. OK?
- You can output a signal from BOTH the balanced and unbalanced signal of the DDRC-88A. The reason is because the signal from the DSP is fed to the DAC and then split to 2 sets of buffers for unbalanced and balanced section.
- On either the input or output, you can mix and match (i.e. unbalanced IN1 to balanced OUT1, balanced IN2 to unbalanced OUT2). That is no problem at all. The "ONLY" problem is that you can "not" mix 2 signals at the input section.

Does this make more sense and clarifies the setup?

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DDRC-88A: 8 channel analogue input/output Dirac 4 years 5 months ago #17447

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keith2014 wrote:
Can someone please give me a definitive and straightforward answer to this:

I am using as Denon X5200W AVR and Emotiva amplifiers.

How do I set the jumpers on the 88A and how do I set the dipswitches?

The analog rated output for the Denon is 1.2V and the rated input for the Emo amps is 1.1V.

Thanks.

Sure, we can help. Based on your ratings, using an unbalanced setup (RCA in/out) that is configured for 2Vrms would be the best setup.
Both your source (Denon) and your amplifier are within that rating.

When trying to match a piece of analog audio gear inside a setup, you just want to make sure that:
- Max output level of your device upstream (i.e. Denon) is close enough to the max input capability of the device (i.e. DDRC-88A @ 2Vrms max in on RCA)
- Max input level of your device downstream (Emo amp) is not going to get overloaded easily.

Because you have almost a unity gain setup here (1.2V in = 1.1V rated power), you'll be good with default unit with default jumpers.
If you feel you need higher outputs, you can easily modify the internal jumpers. Just talk to us when this happens and what the symptoms are.

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DDRC-88A: 8 channel analogue input/output Dirac 4 years 5 months ago #17452

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^^^^^

Many thanks for your prompt and helpful reply.
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DDRC-88A: 8 channel analogue input/output Dirac 4 years 4 months ago #17587

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The DDRC-22A is designed for stereo music while the 88A is designed for use in home theater environment.
Looking at the specs, the DDRC-22A has 96 kHz sampling rates while the 88A works internally only with 48khz.
So I have one question to ask DevTeam or anybody who have tested both devices DDRC-88A and DDR-22A.

Is the stereo sound of DDRC-88A noticeable worse than the sound of DDR-22A?

Thank you!

best regards
Son
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DDRC-88A: 8 channel analogue input/output Dirac 4 years 4 months ago #17589

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nhs wrote:
...Looking at the specs, the DDRC-22A has 96 kHz sampling rates while the 88A works internally only with 48khz.
So I have one question to ask DevTeam or anybody who have tested both devices DDRC-88A and DDR-22A.

Is the stereo sound of DDRC-88A noticeable worse than the sound of DDR-22A?

That depends on who you're asking, of course... :o/

-- Jim (I wish I was joking)

P.S. For my own part, I'm guessing the short answer is "no."
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DDRC-88A: 8 channel analogue input/output Dirac 4 years 4 months ago #17592

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The human hearing only goes up to 20kHz and with sampling frequency of 2x this upper limit based on Nyquist rate, the full bandwidth can be reproduced by the DDRC-88A. The vast majority of the differences one hear is based on the distortions due to the speaker and room inter-acting during full bandwidth reproduction. The up-stream source such as the DDRC-88A has an inaudible impact. I.e. you wont hear any difference between the DDRC-88A and DDRC-22A.

There is a web app called the golden ears (by Philips) that will train you to detect differences between various types of recordings. Try it out yourself and test how good your hearing is.
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DDRC-88A: 8 channel analogue input/output Dirac 4 years 4 months ago #17675

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Any news regarding the new software for the known bugs?

"All this goodness will arrive hopefully by Monday/Tuesday as a beta we're just waiting for Dirac to ship us the packaged file"
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DDRC-88A: 8 channel analogue input/output Dirac 4 years 4 months ago #17727

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Dear All,

Sorry for the delay in getting back to you. We were waiting for the compiled software release from Dirac since they had a busy week. Thanks for your patience!
We did get the software end of the day today and a bit short for our team to double QC it and make sure it's all working as it should compared to the beta.
We did get feedback from the beta testers who were trying out the rev and all was good so far with the beta (i.e. all bugs fixed).

I think that it's best that we double confirm that final release first before posting it online on Monday. Thanks again for your patience and sorry for this little delay.

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DDRC-88A: 8 channel analogue input/output Dirac 4 years 4 months ago #17876

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Clarification request re:

"@ John Ashman
Very good answer already from John Reekie. I guess that the idea of adding a pause in the sweep could be done but right now, this product is indeed only meant to be used in "one" space. i.e. can't have multiple rooms on one unit."

Tony e-mailed me to say that it IS possible to use the 88A as a 4 zone stereo correction system for multi-room systems. Sounds like just a little bit more work to do the measurements and download them into the unit is all. But I just wanted to clarify for myself and everyone here, that by using this technique (measuring and room by room, and then dowloading the files one pair at a time) that it would indeed function with with 4 zones playing different thing simultaneously, for instance, with 4 Sonos units attached and then headed out to an 8-channel amplifier.
Last Edit: 4 years 4 months ago by John Ashman.
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DDRC-88A: 8 channel analogue input/output Dirac 4 years 3 months ago #18227

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Could I please ask if anyone found the correct 3.81mm pitch phoenix to XLR connectors that can ship internationally yet? Would prefer to use these than cut up my current cables. They seem a neater solution in my opinion and would make it easier to remove the 88A from the system should the need arise.

Thanks
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DDRC-88A: 8 channel analogue input/output Dirac 4 years 3 months ago #18276

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@ truscottb,

Unfortunately based on the fact that the unit is 8x8 and the way these 3.81mm are made, you won't be able to fit 4 x of these single 3.81mm connectors side by side (extra plastic on each side of the connector). You'd need to find a single 4x3 (12pin total) 3.81 connector to XLR if you see what I mean?

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DDRC-88A: 8 channel analogue input/output Dirac 4 years 3 months ago #18394

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stephenting99 wrote:
(3) Digital volume control. Assuming the source signal is has 24bit of data, there would be no loss of that data if the volume is at 100%. I.e. input = output. As the volume is turned down from maximum, it will start to truncate from 32bits until eventually reaching 24bits. Question is how far down the volume can one go down from 32bits to 24bits? Is it 10%? Or 20%?

I have the same question.Will some information be lost when I turn down the volume by DDRCA-88A?

I am thinking of using DDRC-88A to control the volume of my system. No preamp as following:
OPPO 103D(analogue output) --- DDRC-88A --- poweramp

Is anyone doing this? Does it sound ok without an AV preamp?
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Re:DDRC-88A: 8 channel analogue input/output Dirac 4 years 3 months ago #18419

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The new multisub app note is a very pithy piece of work. Nice job miniDSP!
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Re:DDRC-88A: 8 channel analogue input/output Dirac 4 years 2 months ago #18507

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DS21 wrote:
The new multisub app note is a very pithy piece of work. Nice job miniDSP!

Glad you like it! Feel free to send any comments for future apps. :-)
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