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Hornresp head fuggery |
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yTho 
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Joined: 27 September 2018 Status: Offline Points: 21 |
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 Topic: Hornresp head fuggeryPosted: 27 September 2018 at 7:13pm |
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I've recently started using hornresp and my first project on it is design a sub for movies with a P audio E12-300s.
By what I've read, Pmax is peak power handling? I dont understand why begins to form as low as 4/5W. My only thoughts are if this driver hates being in a sealed enclosure?   Cheers.
Edited by yTho - 27 September 2018 at 8:02pm |
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MarjanM
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Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7816 |
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Posted: 27 September 2018 at 7:19pm |
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SD is not a volume figure but radiating surface in cm2.
531cm2 in your case Edited by MarjanM - 27 September 2018 at 7:19pm |
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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yTho
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Posted: 27 September 2018 at 7:28pm |
I've never face-palmed so hard in my life. After correcting that.. hornresp's calcs are pretty close but not spot on, what would you trust?  |
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odc04r
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Posted: 27 September 2018 at 8:27pm |
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What are you comparing its results with?
You must bear in mind that Hornresp is working from a relatively simple model of driver and enclosure and it assumes a small signal such that the driver is moving in a way that all of its modeled parameters stay constant. As soon as you give it a large signal then things change. So only take a T/S model as an indicator of low frequency performance. |
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mobiele eenheid
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Posted: 27 September 2018 at 8:47pm |
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The E12-300 is designed for a cabinet of 25 - 40 L, yours is 160 L. Your Sd is still incorrect ;)
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yTho
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Posted: 27 September 2018 at 8:53pm |
Well that could explain a lot... ffs, thank you  EDIT: I've made the enclosure size 30L, I can now put the Pmax to 10W before I get the red line. I'm guessing im heading in the right direction but does this really mean it will only take 10W before it begins the process of disintegrating itself?
Edited by yTho - 27 September 2018 at 8:57pm |
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mobiele eenheid
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Posted: 27 September 2018 at 10:41pm |
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Drivers usually don't disintegrate themselves beyond Xmax but it's a good boundary to respect. In your case, it tells you that you don't want to use this specific driver/ cabinet combination below 100 Hz (or thereabouts). So either change the cabinet or your driver.
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odc04r
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Posted: 28 September 2018 at 9:43am |
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You're probably barking up the wrong tree using this driver for a sub. It's Fs is 60Hz which means you aren't going much lower than that whilst keeping reasonable driver damping which is what tends to cause the over excursion. What is your design specification?
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yTho
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Posted: 28 September 2018 at 10:05am |
I've started to realise this. I've got a e12-300s spare atm that my brother wanted to use to reinforce the bass for his Neat towers to use for movies. I spoke with him about what i've found and he said he isnt too bothered about sub-bass at this stage, so having a bandpass from 50-380 is what he's hoping for. This is a project for both of us in more ways than one.
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odc04r
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Posted: 28 September 2018 at 11:38am |
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I haven't run the numbers but your best bet is probably a vented enclosure tuned to near Fs. Just be aware that under this excursion will rapidly rise as the enclosure cannot damp driver motion anymore - a steep-ish high pass filter would be advised. A 4th order bandpass may be possible, you'd have to see. Harder enclosures to tune though. It's not a great driver tbh. Weak motor. Probably aimed at 2 way midtop type enclosures or double 12 + top disco bin designs. It's on a par with Eminence delta12LF 380Hz is also rather oddly high for a sub. Did you mean 80Hz?
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yTho
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Posted: 28 September 2018 at 4:58pm |
It is quite high, I think he's trying to boost what his towers lack in. Will start looking into how to do bandpass on hornresp and see the outcome, if its poor ill have to just say he needs to get a new driver more suitable. All good learning curves!
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MarjanM wrote: