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Midbase help

Old Jan 23, 2009 | 11:28 PM
  #11  
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^Just put in something like 10 cubes for the box size. Don't agree?

Well I tryed to follow some advice. My last post was all over the map, hard to follow I am sure.

I think one big problem was sub integration as the guys above hinted to (or spelled out) hehe, so I lowered it considerably and that helped get rid of some mudiness on some songs. I also raised the MR level overall which also helped.

I ended up also not using "symetric" xover points, so sub LP @ 63hz and MB HP 70. Different slopes seemed to help out as well.

Would it be fair to say that some songs just aren't mastered to have a lot of impact?

I suppose I am on the right track.

What would one call this problem: when I turn my head lets say listening to a test tone (I also notice it with music) and depending on where my head is it can be loud or quite. It also feels in my head like the phase is wrong, but it's just at a few frequencies. Is that reflections? Is it phase? How does one go about fixing it (hopefully not aiming my drivers differently) hehe. I can't get rid of it messing with T\A or by flipping phase.

I appreciate the help.
Old Jan 23, 2009 | 11:43 PM
  #12  
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Originally Posted by AAAAAAA
^Just put in something like 10 cubes for the box size. Don't agree?

Well I tryed to follow some advice. My last post was all over the map, hard to follow I am sure.

I think one big problem was sub integration as the guys above hinted to (or spelled out) hehe, so I lowered it considerably and that helped get rid of some mudiness on some songs. I also raised the MR level overall which also helped.

I ended up also not using "symetric" xover points, so sub LP @ 63hz and MB HP 70. Different slopes seemed to help out as well.

Would it be fair to say that some songs just aren't mastered to have a lot of impact?

I suppose I am on the right track.

What would one call this problem: when I turn my head lets say listening to a test tone (I also notice it with music) and depending on where my head is it can be loud or quite. It also feels in my head like the phase is wrong, but it's just at a few frequencies. Is that reflections? Is it phase? How does one go about fixing it (hopefully not aiming my drivers differently) hehe. I can't get rid of it messing with T\A or by flipping phase.

I appreciate the help.
the sweet spot in stereo is very small, doesn't take much of a move for it totally change things for the worse.
you could be having some cancellation or resonance issues as well

you said you have an RTA?....do up some graphs of just the midbass playing, the do just the left, then just the right, you should see where your problems are, if the other stuff you've been trying is helping, then we're getting there.

move the mic around and see whats going on, figure out where your sweet spot is. then try to make it bigger without giving up anything.

another thing I do with door mounted MB, because of the different axis, with the H701 take off all time alignment on the MB, lower all eq settings on the right one (yes I said right one) by 2 or 3 db's then re time align and adjust phase if necessary. (worth a shot)

what do you use for phase? your ears and a specific track?...or just music in general?
Old Jan 26, 2009 | 07:40 AM
  #14  
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defro.

U have mail
Old Jan 26, 2009 | 08:50 AM
  #15  
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Originally Posted by defro13
lemme ask you this.....plot that same speaker in 3 cubic ft and 10 cubic feet and show what the difference in response is................
I will give it a try but I think I know where you are going with this. So let me ask you this: knowing that a door is not a true sealed box, and also not true IB, what do you think is the best technique to model in?

Or am I not understanding what you are trying to get at?
Old Jan 26, 2009 | 09:19 AM
  #16  
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Originally Posted by MTT
lower all eq settings on the right one (yes I said right one) by 2 or 3 db's then re time align and adjust phase if necessary. (worth a shot)

what do you use for phase? your ears and a specific track?...or just music in general?
Interesting, what is the purpouse of lowering all EQ bands by 3db on one side?

For phase, just any music. But sometimes using test tones I can pinpoint what I think is a phase issue but happens at just specific frequencies... really odd not sure if it is phase,cancelation or reflection or other. Not sure what to make of it or how to fix it. This is troubling me more then the midbase as midbase is pretty good right now after messing around with overall levels.
Old Jan 26, 2009 | 01:17 PM
  #17  
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No car environment is true IB, unless you have a woofer mounted in the floor and it truly is vented to the outside. Doors and trunks are like big leaky (but you can control that) sealed boxes. A door has somewhere around 2-3 cu. ft. in it. A trunk can have 10 cubes or more. I found a spec for my 02 Cavalier 2 door I just bought that says it has 13.4 cu. ft. of storage space. I take that number to be the trunk space. Take a rough dimension of your door, width and height. Open the door and look at the depth of it and make a guesstimate on average depth, deduct around 20% for the stuff in it like window mechanisms and you have an idea on how much airspace there is in your door.
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