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Hornresp & WinISD, xmax difference

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Jay Lawless View Drop Down
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Joined: 22 August 2005
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jay Lawless Quote  Post ReplyReply Direct Link To This Post Posted: 25 July 2006 at 11:57pm
Originally posted by Calitri Calitri wrote:

NevewWinter: The design is based on RCF L18G400/P300 drivers, so the Fs are 28 Hz for the G400 and 33 Hz for P300. I know there has to be a highpass, that's natural of course but that 35 Hz highpass wouldn't do the trick, 'cause then the lowest EQ point would be around 50-60 Hz. What's the point of making 18" horn, if it can't go lower than 60 Hz?

 
ahh see now i don't know much about many of the RCF drivers so...
 
but also, don't go by what winISD says for Xmax modeling, it's ok to a point, but Hornresp will give you a more accurate model.
 
but at the same time, this is why i mention the crossover comment. whats the point of worrieing about those low ends when you'll be crossing them out anyway...? unless you're trying to design one REALLY long horn to get some subsonics going on in an install system, then theres no need to worry about the Xmax smikes that Hornresp is giving you at such low points...
 
this is just my own personal opinion. i know that you still want to find out about this, but it just seems pointless to me...
 
 
Previously known as NeverWinter

Background: Automotive, Live and Home Custom Design. mid/high level based design and feild experience. Bass specialist
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Calitri View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Calitri Quote  Post ReplyReply Direct Link To This Post Posted: 26 July 2006 at 3:45am
JD01: My bad, a bit of a wrong word for the point. I mean, that F1 recommends for the EQ points to be in the region of 30-40, depending on the size of the stack. Of course you can have what ever EQ points in your system but that's the reasonable point, below which there's no point of EQing.

I'm trying to get the system to reach 40 Hz maybe around -3 to -5 dB range in a stack of 4 w/o EQ and with EQ 0 to -3 dB. But I can't do that if the tweaking causes the voice coil to hit the back plate at full power. Of course there would be a highpass of 4th order BW around 35-40 Hz.

Neverwinter: Thanks for the information I've been trying to get. So the Hornresp IS quite accurate. I have experience of RCF drivers and they are awesome. We have in our universitys rig, which we built some time ago. They are reliable drivers which can take a helluva beating. I recommend them. I can post my "Great" plans, if somebody's interested and has enough money/time to build them.
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JD01 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JD01 Quote  Post ReplyReply Direct Link To This Post Posted: 26 July 2006 at 12:20pm
WinISD pro doesn't take all the dampening effects of the enclosure in account. So the excursion displayed by WinISD pro will be a bit higher than in real world. Close enough to get the point, but not fully accurate.
 
Hornresp uses physical modelling of the 'mechanics' going on, so the result will be as good as the physical model used. As far as I know it's pretty accurate with HornResp or AJhorn.
 
What F1 does is rely on the technician to keep an eye on everything. If the highpass is set for 24Hz and someone plays a very loud 30Hz signal, it WILL bottom out. They rely on the fact, that usual music won't have such content on high intensity....
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Jay Lawless View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jay Lawless Quote  Post ReplyReply Direct Link To This Post Posted: 26 July 2006 at 5:33pm
Originally posted by Calitri Calitri wrote:

JD01: My bad, a bit of a wrong word for the point. I mean, that F1 recommends for the EQ points to be in the region of 30-40, depending on the size of the stack. Of course you can have what ever EQ points in your system but that's the reasonable point, below which there's no point of EQing.

I'm trying to get the system to reach 40 Hz maybe around -3 to -5 dB range in a stack of 4 w/o EQ and with EQ 0 to -3 dB. But I can't do that if the tweaking causes the voice coil to hit the back plate at full power. Of course there would be a highpass of 4th order BW around 35-40 Hz.

Neverwinter: Thanks for the information I've been trying to get. So the Hornresp IS quite accurate. I have experience of RCF drivers and they are awesome. We have in our universitys rig, which we built some time ago. They are reliable drivers which can take a helluva beating. I recommend them. I can post my "Great" plans, if somebody's interested and has enough money/time to build them.
 
i would recommend PMing the plans to whom may be interested, just incase it does actualy work very well, you can still have some ability of copyrights before some Rep of some company gets the idea to copy it and call it their own.
 
i my self would like to see this cab you'r designing, PM it this way!


Edited by NeverWinter - 26 July 2006 at 5:34pm
Previously known as NeverWinter

Background: Automotive, Live and Home Custom Design. mid/high level based design and feild experience. Bass specialist
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