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TOPIC: DDRC-88D - DDRC-88BM - 4 ways active speakers

DDRC-88D - DDRC-88BM - 4 ways active speakers 2 weeks 5 days ago #51601

Hello,
I am new on this forum and french (sorry for my poor english) .
I bought a DDRC-88D with DDRC-88BM option to replace a 4 ways digital filter.
So , my configuration is not a 5.1 configuration but a simple stereo 4 ways active system with a Okto-Dac8pro DAC and 8 DIY valve amplifiers.
My difficulties is to understand the setup of the MiniDSP in my configuration because MiniDSP manuals and technical notes describe 5.1 system and passive speaker filters.
If somebody have the same configuration, can he help me for the setup ?
Best regards
Jacky
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DDRC-88D - DDRC-88BM - 4 ways active speakers 2 weeks 5 days ago #51602

  • mdsimon2
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Is there a particular issue that you are having difficulty with? Are you referring to issues with setting up Dirac or with the 4 way crossover?

I had considered a very similar setup but ended up going with a miniSHARC instead of a DDRC-88D as I wanted user controlled FIR filters. As such I have thought through implementing a 4 way setup with the DDRC-88D but have not done it in practice. See below for the steps I would have taken. This approach only uses 2 channels of Dirac correction.

The DDRC-88BM plugin has 5 tabs, LFE Mgt, Routing, Dirac, Mixer and Outputs.

For a 4 way setup you should NOT need to do anything with the LFE Mgt tab.

In the Routing tab you will route 2 input channels (left/right) to 2 Dirac channels as shown in the attached image.

The Dirac tab will only be populated once you run Dirac so nothing to change here.

In the Mixer tab you will route the 2 Dirac channels to your outputs as shown in the attached image.

In the output tab you will implement your crossovers and any other EQ you need. Basics are:

Sub -> LPF
Low -> HPF and LPF
Mid -> HPF and LPF
High -> HPF

Hope this helps.

Michael
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DDRC-88D - DDRC-88BM - 4 ways active speakers 2 weeks 4 days ago #51607

  • kmajjo
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Hello Michael,
Thank you very much for your clear answer , it helps me.
To go further, i have an other comprehension issue with the time alignment speakers :
Is-it needed to align time speaker with REW or Dirac software can do it itself ?
Br
Jacky
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DDRC-88D - DDRC-88BM - 4 ways active speakers 2 weeks 4 days ago #51610

  • mdsimon2
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With the method I described using 2 channel correction you need to have the crossovers / delays between drivers set prior to running Dirac. REW is a good option for evaluating these delays and making sure you have good phase integration between drivers at the crossover points prior to running Dirac.

I should mention that although 2 channel correction is probably the best place to start, with the DDRC-88D you do have the option of assigning each driver an individual Dirac channel. Again, I have not personally done this but it would seem to me that you will always want to keep your Low/Mid/High drivers on one Dirac channel but it may make sense to assign your subwoofers to individual channels and let Dirac handle the Sub / Low integration. In this case you would not set a LPF or any delay on the subwoofers. I've attached routing matrices showing how this would be done with a stereo subwoofer setup.

Have you read the application guide linked below? It gives a pretty good overview of setting up active speakers using the DDRC.

www.minidsp.com/applications/digital-cro...akers-with-ddrc-88bm

Michael
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DDRC-88D - DDRC-88BM - 4 ways active speakers 2 weeks 3 days ago #51631

  • kmajjo
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Hello Michael,
Thank you very much for this detailed answer , as you can see in the joined picture my system don't include subwoofer but low enclosers.
Br
Jacky

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DDRC-88D - DDRC-88BM - 4 ways active speakers 2 weeks 2 days ago #51644

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Hello Michael,
After reading the DDRC-88D manual the situation is not clear for me.
I don't understand very well what is the order of the steps to setup the DDRC-88D with DDRC-88BM option.
Is that it ? :

1 - Setup speakers time alignment with REW
2 - Install Dirac software on to the computer
3 - Setup Mixer and Routing Tables
4 - Setup the crossover
5 - Setup Time Delay (from REW)
6 - Dirac live (MiniDSP Dirac Live User Manual)

Is this correct ?
Br
Jacky
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DDRC-88D - DDRC-88BM - 4 ways active speakers 2 weeks 2 days ago #51648

  • mdsimon2
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Yes, the order of your steps is correct although you appear to have listed the time alignment step twice.

1 - Setup speakers time alignment with REW
2 - Install Dirac software on to the computer
3 - Setup Mixer and Routing Tables
4 - Setup the crossover
5 - Setup Time Delay (from REW)
6 - Dirac live (MiniDSP Dirac Live User Manual)

Michael
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DDRC-88D - DDRC-88BM - 4 ways active speakers 2 weeks 2 days ago #51651

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Hello Michael,
Sorry , but in step five i wanted to say that i set up time alignment into DDRC-88D software with the measurements done at step one.
Br
Jacky
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DDRC-88D - DDRC-88BM - 4 ways active speakers 1 week 6 days ago #51707

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Hello Michael,
I am trying to use my DDRC-88D with Umik-1 microphone into REW.
If the Umik-1 microphone is well recognized by REW as input device, i can’t use the DDRC-88D as the output device (see attached file).
I didn't find a driver in the Minidsp WEB site .
Do you have an idea ?
Br
Jacky

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DDRC-88D - DDRC-88BM - 4 ways active speakers 1 week 2 days ago #51746

  • mdsimon2
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The DDRC-88D does not have a USB audio input so it will not be recognized as an output by REW. Does your computer have a digital audio output that you could route to the DDRC?

Michael
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DDRC-88D - DDRC-88BM - 4 ways active speakers 1 week 2 days ago #51756

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Hello Michael,
The mistake comes from my my bad knowledge of MiniDsp products , some have a Output sound driver some not :(
Unfortunately, my laptop does not have a digital output, so I will do as on the attached plan.
Thanks.
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