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TOPIC: Dual DDRC88bm with multi subs

Dual DDRC88bm with multi subs 4 months 3 weeks ago #36282

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I am at my wits end. The issue before I explain the setup is that I have no subwoofer output. I also posted on AVSforum but do so here also.

I followed Markus767’s solution from AVSforum for cascading dual DDRC88bm with multi sub in order that all BM is done internally by the dual 88’s in a 7.4.4 system.

Setup
All input and output channels are wired using balanced cable. Unit 1 is setup for all ground level speakers as per kbarnes701’s dual DDRC88 guide except that Ch 3 output is wired to the Ch 3 input on Unit 2 per Markus767’s solution in Jerry’s “a guide to base management using Minidsp DDRC88A BM Plug in”. I also ran the MSO procedure and implemented a 3 sub configuration.
Unit 2 is used for the 4 atmos speakers and all subs. The output channels are setup as follows. I used ch 3 for the iBeams, 6-8 for the subs which is placed per Dr Floyd Toole 3 sub configuration. Channel 1,2,4 and 5 was set for the overhead Atmos speakers. Please see the attachments for a clear layout.

Procedure followed
I entered the MSO gains, delays and the likes into Unit 2 and set the BM per the guide and ran DL on Unit 2 using a custom 5 channel configuration. All subs energized so I assume my mixer setup is correct on Unit 2. Then I set BM on Unit 1 and attempted to run DL. Channel 3 showed an error due to no output and DL would not continue. Tried anything I could think of but without success. So eventually I ran a 7 channel custom setup so I could at least get some decent sound as I was over eager with my new projector arriving. I ignored channel 3 so that the DL measurements would continue. I am thinking that this must be the point where I went wrong but cannot figure out what is wrong with channel 3 not registering white noise for the -12db signal set in DL. Btw I made sure to set channel 3 to LFE not Dirac 3 (on both units) under LFE Management

Then I tested the SSP level before I wanted to align the 2 units per the KBARNES guide (I also inserted a dedicate pre amp between the SSP and Unit 1 thinking that the delay introduced will be resolved by the SSP per the dual integration procedure final step)

This ends up where I started, NO low end. The subs are not getting signal. I originally thought that I wired the sub channel incorrectly but this was not the case.

I managed to run REW for the MSO procedure testing individual and combined subs using an analogue input on channel 1 of Unit 1 and channel 3 on Unit 2. BTW is that correct as I pre wired both units. Should I have rather run REW on one unit which makes sense to me now as the timing reference would be impacted by latency between the units? This is a side issue but I am thinking that my solution at the time was incorrect.

I am lost with no idea what I have done wrong. I tested the wiring again and also ran an analogue signal into channel 3 of unit 1 to check if the BM plug in register signal which it did.

Your insights would be greatly appreciated.
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Dual DDRC88bm with multi subs 4 months 2 weeks ago #36371

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@ MGHT

THanks for the long email explanation. It sounds like an issue of routing but could be very wrong..
Looking at 3 screenshot when there are 100 of settings is a bit hard to guess.. :-)
Please post your XML file (UNIT 1 and UNIT2) along with a little diagram of which source/speaker is wired to what on these 2 units.

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Dual DDRC88bm with multi subs 4 months 4 days ago #36495

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Hi, apologies, I was away on leave .

Please find attached the required files.

Thanks
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Dual DDRC88bm with multi subs 4 months 2 days ago #36588

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Hi

Here is the connections map which was not previously posted.
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Dual DDRC88bm with multi subs 3 months 3 weeks ago #36629

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Is this resolved?
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Dual DDRC88bm with multi subs 3 months 3 weeks ago #36648

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@MGHT

Maybe the problem might be simpler than you think... :-)
Did you check the EQ curve that you put inside the UB1 SUB out PEQ section? It looks like this.



Obviously, you're doing circa -30dB (if not more) of attenuation with that very odd eQ... So in the end, you have zero signal with so much attenuation...

I think that your MSO/REW EQ process is the issue here. Bypass the EQ in the DDRC-88BM. Should get your SUB back..

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Dual DDRC88bm with multi subs 3 months 3 weeks ago #36651

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That must be it. I am puzzled why that would be as I cannot recall setting as per your screen shot but did do the imports from MSO but to unit 2. Must have done something wrong somewhere. :blush: None the less just very happy that you could assist.

Thank you!

Will give feedback.
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