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Old 2 Weeks Ago   #1
 
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Default sub eq help

Hey guys, so here is my set up. I have AF 690's in the doors and AF gs42 in the dash.My sub is a jl 10w6d4 They are being powered by jl hd900.5. I also have a helix in the chain. noob as far as tuning with a dsp goes. I have the 690's xover at 70 and 220. The gs42's are also at 220. The sub is at 50. I have tried other configurations but as you can see there is something going on down at the low end. I have tried putting a shelf filter at 100 +3db which helps some. I can get the Midbass to pound but lower frequencies are dead. What am I doing wrong or better yet am I doing anything right? REW is for sure a learning curve. What its telling me to do on the low end 30-50 is drastic cuts. seems like that's where I would need boost. Like I said, total noob so any help would be appreciated.
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Old 2 Weeks Ago   #2
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Default Re: sub eq help

try cutting all but subs and aiming for a similar curve to this
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Do you have that crossed at 50?
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This sounds much better. Slowly getting there.
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Old 1 Week Ago   #5
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Default Re: sub eq help

Bump up your lpf to about 80hz, and match your mid hpf to the same. Your suns can play well beyond 50hz, so let them. They are better suited for the job of 50-80hz than your mids are.
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Default Re: sub eq help

The 70 to 200 might still be too high I think, but this is a personal choice.

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To be honest, I based my settings on what Andy suggested to me. I’ve played around with them but nothing has sounded as good as the points he suggested. My only issue has been the sub but I think I’m getting there.
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The 70 to 200 might still be too high I think, but this is a personal choice.
What would you suggest. I’m definitely willing to try something out.
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Bump up your lpf to about 80hz, and match your mid hpf to the same. Your suns can play well beyond 50hz, so let them. They are better suited for the job of 50-80hz than your mids are.
I’ve tried running the sub up to 70 - 80 range but could never get the staging right. Everything seems to fall in place at 50. I just had to work the eq. It’s also extremely likely that I wasn’t skilled enough to fix the staging with the sub that high.
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Default Re: sub eq help

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Originally Posted by adrian s View Post
Iíve tried running the sub up to 70 - 80 range but could never get the staging right. Everything seems to fall in place at 50. I just had to work the eq. Itís also extremely likely that I wasnít skilled enough to fix the staging with the sub that high.
That's kinda tough. You have to play around with delay or phase to get the "on the dash" bass effect. I added 12.5 ms delay to everything, then subtracted delay from the subs until I got that effect.
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Default Re: sub eq help

12.5 ms is the wavelength of an 80 hz sine wave, subtract a quarter (3.125 ms) to change phase 90 degrees, an eighth (1.5625 ms) for 45 degrees, half (6.25 ms) for 180 degrees, etc.
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Default Re: sub eq help

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Originally Posted by adrian s View Post
What would you suggest. Iím definitely willing to try something out.
The one I have actually looks like the graph from tyroneshoes above (but my 25 to 30 is a little higher).

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12.5 ms is the wavelength of an 80 hz sine wave, subtract a quarter (3.125 ms) to change phase 90 degrees, an eighth (1.5625 ms) for 45 degrees, half (6.25 ms) for 180 degrees, etc.
Do you initially add the sub distance or just everything else?
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Default Re: sub eq help

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Originally Posted by adrian s View Post
Iíve tried running the sub up to 70 - 80 range but could never get the staging right. Everything seems to fall in place at 50. I just had to work the eq. Itís also extremely likely that I wasnít skilled enough to fix the staging with the sub that high.
You should be able to play up to around 120hz before the bass has any affect on staging. Frequencies that low are not localizable, so you can't hear where they're coming from, thus they wouldn't hurt staging. Rattles, buzzes, and other noises that are excited by the sub could hurt staging, however. When the sub hits it excites all of the panels, if they aren't deadened then the higher frequencies that they produce in time with the sub could draw your attention rearward, but that should be fixed with deadening, not lowering your LPF.

You've got plenty of tools to fix the problem, I'm sure you'll find what works.
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Default Re: sub eq help

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Originally Posted by gijoe View Post
Bump up your lpf to about 80hz, and match your mid hpf to the same. Your suns can play well beyond 50hz, so let them. They are better suited for the job of 50-80hz than your mids are.
I dont suggest this. since most want their sub at a higher level then their midbass, you want a slight gap in between them to keep the phase in tact at the crossover.

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Default Re: sub eq help

what car is it? where are you getting signal from? stock radio? aftermarket? etc etc.

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what car is it? where are you getting signal from? stock radio? aftermarket? etc etc.
2015 Jeep Cherokee trailhawk. I’m using the stock 8.4 Uconnect
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what car is it? where are you getting signal from? stock radio? aftermarket? etc etc.
man I spent hours today trying to dial in the sub. I had to walk away Eventually. I have it set at 50hz because that feels the closest. I just can’t find the sweet spot.
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Default Re: sub eq help

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Do you initially add the sub distance or just everything else?
Just do standard T/A first, then add an identical amount of delay to everything, then you can subtract delay from the sub only to change the phase. Most of the time, the sub has no delay because it is the farthest speaker, so adding the same amount of delay to everything should maintain your staging while giving you something to work with on the sub.
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This is the method that I’ve been trying to use. I’m having trouble figuring out exactly how much delay to add to everything.
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Default Re: sub eq help

A very simple example.
before. after
Left front delay. 5 ms. +12.5 ms. 17.5 ms
Right front delay. 3 ms. +12.5 ms. 15.5 ms
Sub delay. 0 ms. +12.5 ms. 12.5 ms

Now you have enough delay on the sub to change the phase 360 degrees at 80 hz. You don't necessarily need that much delay 6.25 ms would probably be plenty (180 degrees of phase).
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Quote:
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Quote:
Originally Posted by adrian s View Post
Do you initially add the sub distance or just everything else?
Just do standard T/A first, then add an identical amount of delay to everything, then you can subtract delay from the sub only to change the phase. Most of the time, the sub has no delay because it is the farthest speaker, so adding the same amount of delay to everything should maintain your staging while giving you something to work with on the sub.
OK so Ive only been adding delay to everything except the sub. What you’re saying is include the sub as well and then subtract the sub to find the sweet spot? I will try this
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Do you also time align the sub? In the Initial distance?
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Default Re: sub eq help

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This is the method that Iíve been trying to use. Iím having trouble figuring out exactly how much delay to add to everything.
Do you have a mic? Have you tried inverting the polarity on the sub, then playing a tone that falls in the xover between sub and mids, and adjust for lowest volume, then change the sub polarity back to normal? Or don't change polarity on the sub and adjust for maximum volume. I find it easier to do using a mic and REW's spl meter.
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Default Re: sub eq help

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Do you also time align the sub? In the Initial distance?
Yes.
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