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DDRC-88D - DDRC-88BM - 4 ways active speakers 11 months 2 weeks ago #51601

  • romainjoachim
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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 11 months 2 weeks 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 11 months 2 weeks 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 11 months 2 weeks 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 11 months 1 week 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 11 months 1 week ago #51644

  • kmajjo
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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 11 months 1 week 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 11 months 1 week ago #51651

  • kmajjo
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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 11 months 1 week ago #51707

  • kmajjo
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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 11 months 6 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 11 months 5 days ago #51756

  • kmajjo
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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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DDRC-88D - DDRC-88BM - 4 ways active speakers 10 months 2 days ago #52532

  • kmajjo
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Hello ,
For a 4 ways active loudspeaker system , to have
SUB L & R on OUT 1 & 2
BASS L & R on OUT 3 & 4
MID L & R on OUT 5 & 6
HIGH L & R on OUT 7 & 8
you must have this DDRC setup :

ROUTING :


MIXER :




OUTPUT :




Br
JACKY
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DDRC-88D - DDRC-88BM - 4 ways active speakers 8 months 1 week ago #54029

  • lamma
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Hi, kmajjo,

This is Lamma and and also new to MiniDSP, I have a plan similar to yours and hope can get help over here.

My plan is going to build an active Crossover system for my old JBL 4344 which means to get rid of the build-in passive crossover.

I tend to use DDRC-88A for the active crossover, with my mixer as preamp and 4 pcs of stereo power amp (same brand, same model), music source would be internet streamer (Tidal), CD and LP.

My question is do you think DDRC-88A could do the right job in my case ?
Because I just started to study DSP stuff, I am curious DDRC-88A can take care some topics like Driver time alignment and Phase correction ?

Since I knew internal crossover already take care Time Delay and Phase problem while design stage, once I take away the internal crossover, I should have to face those problem by using active crossover, therefore, I want to know am I going to the right way by using MiniDSP ?

Many thx for your time
Lamma

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DDRC-88D - DDRC-88BM - 4 ways active speakers 8 months 6 days ago #54042

  • kmajjo
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Hi, Lamma,
As you can see in the post 52532 , i use a DDRC-88D + DDRC-88BM option.
Even the dirac software can make speaker box alignment and phase, you must previously make speakers alignment with REW software for exemple (hard task) to obtain the best phase/alignment between loudspeakers.
After this task , you can set the delays in the DDRC for each speaker.
MiniDSP support is not at the top to help us :( , so if you have question don't hesitate !
Br
Jacky

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DDRC-88D - DDRC-88BM - 4 ways active speakers 8 months 6 days ago #54043

  • lamma
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Thx you Jacky prompt reply.

Do you know any internet resources which I should read/study before action for speaker alignment and phasing while using REW ?

regards,
Francis

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