I need guidance/help with 2.1 subwoofer time alignment

[boxerfan88]

I've been experimenting with different approaches to time align subwoofer to LR mains.

Right now, I am looking at using the step chart.

Alternative 1: time align the first peak

Alternative 2: time align at the 100% level.

Of the two alternatives above, which one might be better method to time align subwoofer-to-mains ?

( To my ears, while playing music they both sound identical. )
( However, REW sweep FR chart shows clear differences - shifting of peak & valleys )

Appreciate all guidance and sharing.

 

[boxerfan88]

Just in case anyone wants to play around with the MDAT file, I attach it here.

 

[ppataki]

I've been experimenting with different approaches to time align subwoofer to LR mains.

Right now, I am looking at using the step chart.

Alternative 1: time align the first peak

View attachment 397742


Alternative 2: time align at the 100% level.

View attachment 397743

Of the two alternatives above, which one might be better method to time align subwoofer-to-mains ?

( To my ears, while playing music they both sound identical. )
( However, REW sweep FR chart shows clear differences - shifting of peak & valleys )

Appreciate all guidance and sharing.

I use a very different method and it works perfectly:
Post in thread 'Setting subwoofer delay' https://audiosciencereview.com/forum/index.php?threads/setting-subwoofer-delay.18436/post-2055961

There was a bit of a challenge with the UMIK-1 microphone using this methodology but it got resolved by moving to a UMIK-2 mic (you can see that if you check subsequent posts in the above thread)

 

[dualazmak]

I've been experimenting with different approaches to time align subwoofer to LR mains.

Right now, I am looking at using the step chart.

Alternative 1: time align the first peak

View attachment 397742


Alternative 2: time align at the 100% level.

View attachment 397743

Of the two alternatives above, which one might be better method to time align subwoofer-to-mains ?

( To my ears, while playing music they both sound identical. )
( However, REW sweep FR chart shows clear differences - shifting of peak & valleys )

Appreciate all guidance and sharing.

Thanks a lot for sharing your approaches with me/us!

Very much interesting for me, since I too took similar approaches including "time-shifted multiple Fq rectangular-tone-burst pulse sequence" method as well as almost identical (to yours) "wave shape matching" methods; if you would be interested, please refer to my posts on my project thread;
- Precision measurement and adjustment of time alignment for speaker (SP) units: Part-1_ Precision (time-shifted) pulse wave matching method: #493
- Precision measurement and adjustment of time alignment for speaker (SP) units: Part-2_ Energy peak matching method: #494
- Precision measurement and adjustment of time alignment for speaker (SP) units: Part-3_ Precision single sine wave matching method in 0.1 msec accuracy: #504, #507
- Measurement of transient characteristics of Yamaha 30 cm woofer JA-3058 in sealed cabinet and Yamaha active sub-woofer YST-SW1000: #495, #497, #503, #507
- Identification of sound reflecting plane/wall by strong excitation of SP unit and room acoustics: #498

They worked/work perfectly, at least in my multichannel setup.
I assume my "Part-2_ Energy peak matching method: #494" would be almost identical to your "Alternative 2"!

If possible at your side, I would very much appreciate looking at 3D gain-time-Fq color spectrum (by ADOBE Audition) of your wave matching patterns like I did in my posts #503 and #507; the 3D color spectrum is very much useful for visually "observing" the sound energy distribution in 3D gain-time-Fq space and hence give us invaluable information for determination of crossover Fq (as well as filter-type, gains, slopes) between sub-woofer(s) and woofers.

In case if you would be seriously interested in using the tone-burst signal tracks I prepared and applied in the above my posts, please simply PM me; I will be more than happy to share them with you and other ASR friends.


These posts would be also of your interest, I assume;
- Perfect (0.1 msec precision) time alignment of all the SP drivers greatly contributes to amazing disappearance of SPs, tightness and cleanliness of the sound, and superior 3D sound stage: #520
- Not only the precision (0.1 msec level) time alignment over all the SP drivers but also SP facing directions and sound-deadening space behind the SPs plus behind our listening position would be critically important for effective (perfect?) disappearance of speakers: #687
- Reproduction and listening/hearing/feeling sensations to 16 Hz (organ) sound with my DSP-based multichannel multi-SP-driver multi-amplifier fully active stereo audio system having big-heavy active L&R sub-woofers: #782
- A nice smooth-jazz album for bass (low Fq) and higher Fq tonality check and tuning: #910, #63(remote thread)

You can find the details of my latest PC-DSP-based multichannel multi-SP-driver multi-amplifier fully active audio system here #931 on my project thread.