Optimization of 2.2 system with REW measurements

[Marcin]

Hi,

Recently I bought a second subwoofer for my stereo setup and I want to ask you about proper measurement process to get things optimized.

The setup consists of KEF R3 speakers and two Arendal 1961 1S subs crossed at 80 Hz. Amp is Lyngdorf TDAI-3400 with DSP room correction built in.

The way I have aligned before with only one subwoofer is this:
1. measure the distance to the sub and to the speakers and put the values in the amp together with standard amplifier delay for Arendal (8 ms)
2. in REW measure L + R speaker with L timing reference, sub disabled
3. in REW measure sub with L timing reference and signal sent to R speaker (but R speaker cable disconnected at the amp)
After this I used Alignment tool in REW to find the delay at crossover frequency and adjusted the value in the amplifier delay field in the amp.

Now the question is how to proceed with two subwoofers to set up the proper time alignment? Should I also measure L+R speaker or separately or... I would really appreciate some instructions on how to do it as I can't get my head around it

 

[dualazmak]

Although quite belated, I just came across with this non-answered/non-responded thread.
I assume my recent post here would be of your interest and reference.

Edit to add;
By the way, as for very general discussion/guidance on sub-woofer to woofer crossover, I recently wrote this post #3 responding to @Smoey22's inquiry on his thread.

 

[Keith_W]

Thanks dualazmak for bumping this thread. To the OP (if you are still around), you have a couple of options:

1. If your dual subs are next to your L, R speakers, you can try aligning the L sub to the L speaker, and vice-versa.
2. Forget about time alignment and use MSO.

There is evidence from psychoacoustic studies that the group delay threshold for subs exceeds 10ms. So I would tolerate quite a lot of time mis-alignment. It is more important to align the phase. Read what Bob McCarthy has to say about it.

To learn how to time align subs with REW, you can watch @OCA video:

 

[dualazmak]

By the way, I assume that ADOBE Audition's gain-time-Fq 3D color spectrum can objectively semi-quantitatively and visually represent the "tightness" and "cleanliness" of the sound given by subwoofer (and other SP drivers). If you would be interested, please visit my posts #495, #497, #503 and #507 on my project thread.

Spoiler