TOPIC:

TMV wrote:

So in a Dirac enabled miniDSP unit, like the SHD, the way to go would be:
1. PEQ sub with REW
2. Time align sub with main speakers with REW. Using the alignment tool or just comparing the timing of sub vs speakers.
3. Run Dirac on sub and mains as a single unit

Is that so? 

No, sorry, you've misunderstood me there. Let me try to explain better.

I use REW to choose what crossover filters to use (type and crossover frequency) and to set time delays for arrival time and phase matching. I DO NOT use REW to calculate any PEQ filters or apply these with my SHD. Getting the crossover filters and delays right means the system then behaves like two full-range speakers. I then run Dirac Live which behaves exactly as it would if they were just two full-range speakers.

The signal I send the subwoofer is the sum of the left and right channel signals. This means there are no significant errors of the type you were asking about introduced.

altsouza wrote:

Here it is the steps I used in my system:

1. Measurement - Individual Speakers and Subs with Time reference (four individual measurements for 2 speakes and two subs)
2. Time Align the Subs using REW's Align Tool , using slider for the delay for rear sub 
3. Aplied delay on MiniDsp and measure the Both subs together
4. I did not need to Apply Eq for both subs as mine were OK regardind bumps!
5. Trace Aritimetic both  Speakers A+B (Just clicked the trace buton and Created the A+B )
6. Time Align Kef (A+B with Sub1+Sub2  using Align from XO cursor.
7. After the MiniDsp's bass management , Start Dirac Live in upmix mode for whole Dirac processing




 

OK. thanks. I have tried this. My sub is 38cm behind my mains yet I get an error with the align at cursor that the delay is too much. Not sure what I am doing wrong. My xover is at 80hz. I Can't upload measurment files so uploaded this picture.  
Thanks.

In your case you will add delay to the mains.
Did you measure it with time reference on?

You have to choose the left main speaker as the reference one.

altsouza wrote:

In your case you will add delay to the mains.
Did you measure it with time reference on?
 

Yes

altsouza wrote:

You have to choose the left main speaker as the reference one.
 

Instead of doing Trace Aritimetic both?

TMV wrote:

altsouza wrote:

You have to choose the left main speaker as the reference one.


 

Instead of doing Trace Aritimetic both?


Not in that step. I am referring in the measurement process, in this step you have to use one speaker as the reference time one, only one for all measurements. The one that you hear the chirp, must be for all measurements 


 

altsouza wrote:

TMV wrote:

altsouza wrote:

You have to choose the left main speaker as the reference one.



 

Instead of doing Trace Aritimetic both?


Not in that step. I am referring in the measurement process, in this step you have to use one speaker as the reference time one, only one for all measurements. The one that you hear the chirp, must be for all measurements 



 

That is how I do it. As the sub is very close 10-15cm to the back wall I was advised to rotate it 180deg to face that wall. Surprisingly enough it reduced the delay to 6.14ms. After applying that delay the whole thing sounded and measured better. This brings me back to the importance on automatic algorithm based sub integration. Too bad there is almost no stereo + sub solution.

Guys,

I have to say you're going about multiple sub integration the non-optimal way.

Google multi-sub optimiser (MSO) in fact minidsp have a tutorial on using it. If you want your subs seemlessly integrated with each other and the mains, use it.

It takes a lot of upfront measurement but will calculate the optimal crossovers, delays, gains and create PEQs. You can then manually copy delays and gains but output the rest as biquads for your minidsp.

I know I'm raving about this a lot at the moment but after optimising my subs positions as much as possible, I've used MSO and got my seat to seat variation from 20Hz to 250Hz down to a maximum of +/-2.5dB (with psycho-aoustic smoothing applied). Note this took a bit of trial and error with MSO.

Once you've got that you can run Dirac.

 

Hi @asx77,

I have one sub, does MSO fits the bill in my case? Also I don't have Dirac and only up to 9ms delay on my miniDSP. Will MSO work for me?

Hi @TMV, ah sorry, I didn't see you only had one sub. No I don't think you can use MSO unfortunately. It's designed to work with 2 subs minimum.