DiyMobileAudio.com Car Stereo Forum banner
41 - 60 of 187 Posts

·
Registered
2004 Rav4 (2)JL900/5 MiniDsp 8x12(Dirac) LPG26NA GS25 Epique180-44 (2)Um12
Joined
·
2,145 Posts
When the sub is in the cargo area I have a null. I thought it was just the mid woofers because I had taken near field measurements and they were bottomed out at 180. Now I'm taking near field and they're fine.

With the sub right behind me the null is gone. Fun thing, though: it might be related to the timing. I have to test it more to be sure, but with a few minutes of playing it seemed like the null returned when I moved the timing input by a few inches.

I'll take some measurements after my class tonight or tomorrow morning.
If the subwoofer alone has a null one place and not another it’s not a time issue, unless I’m misunderstanding something.
 

·
Registered
1999 Jeep Wrangler TJ
Joined
·
715 Posts
Discussion Starter · #44 ·
Sounds like we’re making some progress my guy👍
Trying! I don't want anyone to feel like they're wasting their time helping me. I appreciate yours and everyone else's input into this. It's how my system sounds as good as it does, even if it could use improvement 😁

if you think it may be a timing issue have you tried just sitting there and moving the sub timing
I played with it for a few minutes with the sub directly behind me, but not with it back in the cargo area (ran out of time on my break and had to run to a class right after work). I'll try moving it back to the cargo area tomorrow and testing.

Thing is... I really like the way it sounds there. It's ridiculous propped all cockeyed and firing half into my seat and half into my console, but holy heck I didn't realize the sub hit so hard. My eyes bobbled, literally distorted my vision a bit. I love it. I'm not just a bass chaser, the overall SQ is so much better there.

The vibration in the arm rest pulls the sound stage down, which I thought was interesting. If I had my arm up I felt the bass more up front, but when it was resting my mind was start interpreting it coming from the rear. But, still, wow.

If the subwoofer alone has a null one place and not another it’s not a time issue, unless I’m misunderstanding something.
I'm unsure. I didn't get enough time to really draw any conclusions. I was actually setting the delay by ear (I'm going to tape it tomorrow) and running the RTA, which I how I noticed the null increasing as I adjusted (I would restart the RTA every few seconds so it wouldn't just be a wonky average). I'm going to test it more, this is just a strange observation.

Tomorrow:

Set the delay correctly and test.
Move the delay around and test.
Move the sub to various locations in the cab and test.
Move the sub to the cargo area, test while adjusting the time delay.

Should I be measuring with the mids and sub playing, just solo sub, both?

Also, is there a way to tell REW to do a rolling average? Like five averages and then roll off the oldest as you go? I think it would be helpful when I'm just sliding the delay around.

Gah, if I could make the bass sound this good when the sub is in the cargo area I would be happy.
 

·
Registered
Joined
·
4,028 Posts
Trying! I don't want anyone to feel like they're wasting their time helping me. I appreciate yours and everyone else's input into this. It's how my system sounds as good as it does, even if it could use improvement



I played with it for a few minutes with the sub directly behind me, but not with it back in the cargo area (ran out of time on my break and had to run to a class right after work). I'll try moving it back to the cargo area tomorrow and testing.

Thing is... I really like the way it sounds there. It's ridiculous propped all cockeyed and firing half into my seat and half into my console, but holy heck I didn't realize the sub hit so hard. My eyes bobbled, literally distorted my vision a bit. I love it. I'm not just a bass chaser, the overall SQ is so much better there.

The vibration in the arm rest pulls the sound stage down, which I thought was interesting. If I had my arm up I felt the bass more up front, but when it was resting my mind was start interpreting it coming from the rear. But, still, wow.



I'm unsure. I didn't get enough time to really draw any conclusions. I was actually setting the delay by ear (I'm going to tape it tomorrow) and running the RTA, which I how I noticed the null increasing as I adjusted (I would restart the RTA every few seconds so it wouldn't just be a wonky average). I'm going to test it more, this is just a strange observation.

Tomorrow:

Set the delay correctly and test.
Move the delay around and test.
Move the sub to various locations in the cab and test.
Move the sub to the cargo area, test while adjusting the time delay.

Should I be measuring with the mids and sub playing, just solo sub, both?

Also, is there a way to tell REW to do a rolling average? Like five averages and then roll off the oldest as you go? I think it would be helpful when I'm just sliding the delay around.

Gah, if I could make the bass sound this good when the sub is in the cargo area I would be happy.
I haven't completely read this thread, so forgive me if I'm off base.
If you have a 180 hz null with midbass and sub playing, wouldn't it be logical to try an all pass filter at 180 hz on one of those 3 speakers?
 
  • Like
Reactions: Jheitt142

·
Registered
1999 Jeep Wrangler TJ
Joined
·
715 Posts
Discussion Starter · #46 ·
I haven't completely read this thread, so forgive me if I'm off base.
If you have a 180 hz null with midbass and sub playing, wouldn't it be logical to try an all pass filter at 180 hz on one of those 3 speakers?
Welcome!

I don't think the TuN software is capable of doing an all pass filter. I don't recall seeing it, and some googling didn't get any positive results. Is not that fancy 😕.
 

·
Registered
Joined
·
4,028 Posts
Welcome!

I don't think the TuN software is capable of doing an all pass filter. I don't recall seeing it, and some googling didn't get any positive results. Is not that fancy .
Ok, sorry, I just kind of skimmed through the thread.
Maybe try some additional delay somewhere, 5.555 ms is the wavelength at 180 hz, so maybe add 0 - 1.388 - 2.777 ms somewhere to see if it helps.
 
  • Like
Reactions: MercuryFlint

·
Registered
1999 Jeep Wrangler TJ
Joined
·
715 Posts
Discussion Starter · #48 ·
Ok, sorry, I just kind of skimmed through the thread.
Maybe try some additional delay somewhere, 5.555 ms is the wavelength at 180 hz, so maybe add 0 - 1.388 - 2.777 ms somewhere to see if it helps.
No worries! I'll certainly give it a try. Thanks for giving me numbers to work with.
 

·
Registered
1999 Jeep Wrangler TJ
Joined
·
715 Posts
Discussion Starter · #49 ·
Light Black Screenshot Line Slope


So the null is less pronounced. With smoothing it's far less noticeable:

Light Black Screenshot Font Line


With the LPF on the sub at 230 Hz

Light Black Screenshot Font Line


No change.
 

·
Registered
1999 Jeep Wrangler TJ
Joined
·
715 Posts
Discussion Starter · #50 ·
With the PEQ disabled on the woofers:

Light Black Slope Screenshot Font
 

·
Registered
1999 Jeep Wrangler TJ
Joined
·
715 Posts
Discussion Starter · #51 ·
After some tinkering with a fresh PEQ:

Light Black Font Screenshot Audio equipment
 

·
Registered
1999 Jeep Wrangler TJ
Joined
·
715 Posts
Discussion Starter · #52 ·
This time I went with not trying to flatten the areas around the null so much as making the left and right sync. I'll try an overall cut in the 340 Hz region to try flattening it just a little and see how that sounds in the morning.
 

·
Registered
1999 Jeep Wrangler TJ
Joined
·
715 Posts
Discussion Starter · #53 ·
Font Screenshot Biome Line Software
 

·
Registered
1999 Jeep Wrangler TJ
Joined
·
715 Posts
Discussion Starter · #54 ·
Sub in the passenger floorwell, LPF at 280.

Light Black Font Screenshot Slope
 

·
Registered
1999 Jeep Wrangler TJ
Joined
·
715 Posts
Discussion Starter · #55 ·
Null is better, but still present.
 

·
Registered
1999 Jeep Wrangler TJ
Joined
·
715 Posts
Discussion Starter · #56 ·
Sub in the passenger seat facing me.

Light Black Screenshot Font Line
 

·
Registered
1999 Jeep Wrangler TJ
Joined
·
715 Posts
Discussion Starter · #57 ·
Sub in the passenger seat facing up (orange).

Light Screenshot Font Slope Line
 

·
Registered
1999 Jeep Wrangler TJ
Joined
·
715 Posts
Discussion Starter · #59 ·
So weird, is there any big panel that might be vibrating at 180?
Hmm, hadn't thought of that. I'll test when I get home in a few.

Question: I know you aren't supposed to hold a tone on a subwoofer for extended periods, something about it not allowing the sub to move enough to cool. Does that apply to regular woofers?
 

·
Registered
2004 Rav4 (2)JL900/5 MiniDsp 8x12(Dirac) LPG26NA GS25 Epique180-44 (2)Um12
Joined
·
2,145 Posts
Hmm, hadn't thought of that. I'll test when I get home in a few.

Question: I know you aren't supposed to hold a tone on a subwoofer for extended periods, something about it not allowing the sub to move enough to cool. Does that apply to regular woofers?
I don’t know anything about that bud. If you’re talking about testing for a few minutes at reasonable levels I can’t see any problem. But maybe someone is gonna be like hell na, don’t do that yo🤷🏼‍♂️
 
41 - 60 of 187 Posts
Top