AudioCircle

Industry Circles => GR Research => Topic started by: Danny Richie on 3 Sep 2019, 01:39 pm

Title: Check out the tools of loudspeaker design.
Post by: Danny Richie on 3 Sep 2019, 01:39 pm: Have you guys been following along?

I started with the measurements we most hear about in the market place.

https://www.youtube.com/watch?v=4hW9Q2Wv6WE&list=PLUFNGRKZZWXzCt2Syx4yjR4Oy7V-uiePB&index=10&t=1s

Last week were the measurements that really matter.

https://www.youtube.com/watch?v=XK38MZXn4mA&list=PLUFNGRKZZWXzCt2Syx4yjR4Oy7V-uiePB&index=11&t=557s

This week, we looked at the most important tool used in the design stages. Check it out.

https://www.youtube.com/watch?v=G7jEAhp5Fk8&list=PLUFNGRKZZWXzCt2Syx4yjR4Oy7V-uiePB&index=12&t=0s
Title: Re: Check out the tools of loudspeaker design.
Post by: AKLegal on 3 Sep 2019, 02:55 pm: The second video is my favorite yet. I thought I had an idea how to read impedance and spectral decay plots but it turns out that I was an idiot.
Title: Re: Check out the tools of loudspeaker design.
Post by: maty on 3 Sep 2019, 06:30 pm: I just watched the second video and it is fantastic.
Many thanks from Spain.
Title: Re: Check out the tools of loudspeaker design.
Post by: revg1952 on 3 Sep 2019, 06:31 pm: Danny
all of these are very interesting
But i have to agree video #2 was exceptional.
being a former VMPS dealer it was totally eye opening.
keep it up Professor.

thanks
Gary
Title: Re: Check out the tools of loudspeaker design.
Post by: mlundy57 on 3 Sep 2019, 06:35 pm: I agree and have a question: How do you read the spectral decay when a segment appears to dog-leg to the right crossing a number of frequencies?

I would also add the room room issue completely.

Mike
Title: Re: Check out the tools of loudspeaker design.
Post by: maty on 3 Sep 2019, 06:56 pm: I just opened a thread in ASR forums / Speakers, Headphones and Room Acoustics. With four screenshots for now.

[Video] Speaker measurements by Danny Richie

https://www.audiosciencereview.com/forum/index.php?threads/video-speaker-measurements-by-danny-richie.8840/
Title: Re: Check out the tools of loudspeaker design.
Post by: Jmitchell3 on 4 Sep 2019, 12:13 pm: Loved all of these. Thanks Danny!
Title: Re: Check out the tools of loudspeaker design.
Post by: maty on 28 Oct 2019, 09:22 am: I suggest a subject for an upcoming video:

Box speakers with very wide and very even dispersion?

https://www.audiosciencereview.com/forum/index.php?threads/box-speakers-with-very-wide-and-very-even-dispersion.9582/

Its advantages and the problems associated with the room.

Oh, you have a video, The Most Important Audiophile Tool | The Room

https://www.youtube.com/watch?v=G7jEAhp5Fk8&list=PLUFNGRKZZWXzCt2Syx4yjR4Oy7V-uiePB

but it is very generic.
Title: Re: Check out the tools of loudspeaker design.
Post by: maty on 30 Oct 2019, 05:01 pm: Thank you very much for the video!

Acoustic Center Spacing and Why it Matters!
https://www.youtube.com/watch?time_continue=1&v=HByEmfg7kis

(https://www.audiosciencereview.com/forum/index.php?attachments/danny-richie-acoustic-center-spacing-and-why-it-matters-youtube-jpg.37373/) (https://www.audiosciencereview.com/forum/index.php?attachments/danny-richie-acoustic-center-spacing-and-why-it-matters-youtube-jpg.37373/)

(https://www.audiosciencereview.com/forum/index.php?attachments/danny-richie-acoustic-center-spacing-and-why-it-matters-youtube-vertical-axis-png.37375/) (https://www.audiosciencereview.com/forum/index.php?attachments/danny-richie-acoustic-center-spacing-and-why-it-matters-youtube-vertical-axis-png.37375/)

The speaker is the GR Research N2X kit: http://gr-research.com/n2x.aspx
Title: Re: Check out the tools of loudspeaker design.
Post by: revg1952 on 30 Oct 2019, 07:57 pm: Danny
the video's continue to be more helpful and interesting; plus you continue to seem more natural in your on camera presence
keep it up
Gary
Title: Re: Check out the tools of loudspeaker design.
Post by: Danny Richie on 30 Oct 2019, 08:08 pm: Quote from: maty on 30 Oct 2019, 05:01 pm
Thank you very much for the video!

Acoustic Center Spacing and Why it Matters!
https://www.youtube.com/watch?time_continue=1&v=HByEmfg7kis

(https://www.audiosciencereview.com/forum/index.php?attachments/danny-richie-acoustic-center-spacing-and-why-it-matters-youtube-jpg.37373/) (https://www.audiosciencereview.com/forum/index.php?attachments/danny-richie-acoustic-center-spacing-and-why-it-matters-youtube-jpg.37373/)

(https://www.audiosciencereview.com/forum/index.php?attachments/danny-richie-acoustic-center-spacing-and-why-it-matters-youtube-vertical-axis-png.37375/) (https://www.audiosciencereview.com/forum/index.php?attachments/danny-richie-acoustic-center-spacing-and-why-it-matters-youtube-vertical-axis-png.37375/)

The speaker is the GR Research N2X kit: http://gr-research.com/n2x.aspx

Actually the speaker that I used in the example was the N1.

http://gr-research.com/n1.aspx
Title: Re: Check out the tools of loudspeaker design.
Post by: Danny Richie on 30 Oct 2019, 08:08 pm: Quote from: revg1952 on 30 Oct 2019, 07:57 pm
Danny
the video's continue to be more helpful and interesting; plus you continue to seem more natural in your on camera presence
keep it up
Gary

Thanks. I appreciate that.
Title: Re: Check out the tools of loudspeaker design.
Post by: Tyson on 30 Oct 2019, 09:42 pm: Quote from: revg1952 on 30 Oct 2019, 07:57 pm
Danny
the video's continue to be more helpful and interesting; plus you continue to seem more natural in your on camera presence
keep it up
Gary

Agreed!!
Title: Re: Check out the tools of loudspeaker design.
Post by: Jaytor on 30 Oct 2019, 10:06 pm: Another great Tech Talk. Thanks Danny.
Title: Re: Check out the tools of loudspeaker design.
Post by: maty on 31 Oct 2019, 08:25 am: About the usual dip in vertical axis in many speakers, new model from Focal, Chora 806 with this problem:

https://www.audiosciencereview.com/forum/index.php?threads/new-focal-chora-806-on-and-off-axis-measurements.9613/

Vertical above and below tweeter 0/5/10/30 degrees:

(https://www.audiosciencereview.com/forum/index.php?attachments/chora-vertical-png.37242/) (https://www.audiosciencereview.com/forum/index.php?attachments/chora-vertical-png.37242/)

Quote
Here things get quite a bit messier, with notable dips forming around the 3Khz crossover merely a few degrees off-axis. You'll want to get the vertical height just right for the best sound; you'll probably want a stand with adjustable height or angling.

(Note that the '0' graph looks a bit different here because my vertical measurement technique involves putting the speaker on its side. This has an effect on the measured on-axis curve, but my intention here is to show off vertical dispersion.)
Title: Re: Check out the tools of loudspeaker design.
Post by: maty on 31 Oct 2019, 08:30 am: BTW, Danny, what do you think about: "Tilted stand for Time Alignment" of the 826 towers.

(https://lh5.googleusercontent.com/J3vQnYmk6MzoQis09s8LnWpEmAYfrECLT-xeMvtjBrqCz-e95kLsMKTigZXi47UPevcIjNQIxOqiQB1zjqFm2V8zP0Z4Vg4_PQQjh4hkoY5KX8asd63L3KVLFxYiNOrdPJlCBWna) (https://lh5.googleusercontent.com/J3vQnYmk6MzoQis09s8LnWpEmAYfrECLT-xeMvtjBrqCz-e95kLsMKTigZXi47UPevcIjNQIxOqiQB1zjqFm2V8zP0Z4Vg4_PQQjh4hkoY5KX8asd63L3KVLFxYiNOrdPJlCBWna)

Good, very good or cheap solution?
Title: Re: Check out the tools of loudspeaker design.
Post by: Danny Richie on 31 Oct 2019, 03:16 pm: Tilting a speaker back to more physically align the drivers doesn't always make an improvement. It can, but it depends on a number of factors.

Having the drivers physically aligned verses having an offset from a typical baffle mounting requires a different type of crossover. The crossover will shift phase to bring the alignment back in time acoustically. So then tilting it might make it off. You'd have to measure them to see where the center axis is for being in absolute acoustic phase.