would this design create cancellation?

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=136660
Printed Date: May 02, 2024 at 6:13 AM

Topic: would this design create cancellation?

Posted By: 04nata
Subject: would this design create cancellation?
Date Posted: May 18, 2014 at 5:03 PM

Would this type of setup create massive cancelation?

posted_image

-------------
2004 Hyundai Sonata
Kenwood KDC-X599 HU
2-Sundown X-18D4
2-SQ Q4500.1
2-SQ Q90.4
1-Massive DBX4
8-Niche 5.25 mids
8-Niche Tweeters
4-Skar 8" mid-bass
OhioGen 220a alt
OhioGen 350a alt
156.0

Replies:

Posted By: oldspark
Date Posted: May 18, 2014 at 7:42 PM

IMO unless constant frequency with appropriate phasing (delays), yes.

Whether "massive" cancellation depends on dimensions & frequency.

Posted By: 04nata
Date Posted: May 18, 2014 at 7:44 PM

It would be 6 - 15's, constant and equal frequncies to all 6 subs, I have no way of creating delays

-------------
2004 Hyundai Sonata
Kenwood KDC-X599 HU
2-Sundown X-18D4
2-SQ Q4500.1
2-SQ Q90.4
1-Massive DBX4
8-Niche 5.25 mids
8-Niche Tweeters
4-Skar 8" mid-bass
OhioGen 220a alt
OhioGen 350a alt
156.0

Posted By: 04nata
Date Posted: May 18, 2014 at 7:59 PM

Would this have less chance of being an issue?. all 15's, all sealed (seperate) and all at the same, brand, same frequency and power

sorry for the crude diagrahm

posted_image

Posted By: oldspark
Date Posted: May 18, 2014 at 9:16 PM

What frequency?

Posted By: 04nata
Date Posted: May 18, 2014 at 9:37 PM

=< 55HZ

-------------
2004 Hyundai Sonata
Kenwood KDC-X599 HU
2-Sundown X-18D4
2-SQ Q4500.1
2-SQ Q90.4
1-Massive DBX4
8-Niche 5.25 mids
8-Niche Tweeters
4-Skar 8" mid-bass
OhioGen 220a alt
OhioGen 350a alt
156.0

Posted By: oldspark
Date Posted: May 18, 2014 at 11:44 PM

The wavelength @ 50Hz is about 6m so if dimensions are negligible in comparison. IE - based on your first diagram, end speakers 1m apart will about ~60 degrees out of phase; or ~20 degrees if at 20Hz (if I calculated right; ie 330m/s).

Others should be able to advise - I'm not into audio & speakers etc.

Posted By: 04nata
Date Posted: May 19, 2014 at 12:56 AM

But the second diagram should be fine right?

-------------
2004 Hyundai Sonata
Kenwood KDC-X599 HU
2-Sundown X-18D4
2-SQ Q4500.1
2-SQ Q90.4
1-Massive DBX4
8-Niche 5.25 mids
8-Niche Tweeters
4-Skar 8" mid-bass
OhioGen 220a alt
OhioGen 350a alt
156.0

Posted By: oldspark
Date Posted: May 19, 2014 at 1:28 AM

You're gonna have reflections & path differences.

What are you trying to do?
Why not one or fewer speakers straight out?

Posted By: 04nata
Date Posted: May 19, 2014 at 9:33 AM

I already have 4-15's walled, all built for SQ, sealed (no ports, just my personal choice), but I want MORE, so was gonna go with 2 more and another JX1000D

I have seen tons of setups with subs facing directly at each other, doesnt this cause cancelation?

posted_image

Posted By: oldspark
Date Posted: May 19, 2014 at 11:07 AM

It depends where you are.
In the middle and other right spots it's reinforcement. Move a 1/4 wavelength either side & it's cancellation.

Posted By: futurelead
Date Posted: May 27, 2014 at 5:08 PM

I had 8 10's like your second design, sounded great, now my honda has 2 11" subs facing each other about 7" apart, no problem, so long as they are the same model, same frequency, same signal strength.

Posted By: DYohn
Date Posted: June 03, 2014 at 5:47 PM

No it won't cause cancellations of any appreciable nature unless you wire the subs out of phase. Go for it.

-------------
Support the12volt.com