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hornresp excursion plots |
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snowflake 
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Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3011 |
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 Topic: hornresp excursion plotsPosted: 23 July 2008 at 9:48am |
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Hi
has anyone done a hornresp model of the porn horn woofer section? any idea what voltage is needed to hit xmax of 3.5mm?
cheers
Phil
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snowflake
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Posted: 24 July 2008 at 1:08pm |
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well, if no one has done a model - what's the biggest amp anyone has used on them without them sounding crap?
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josh
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Posted: 24 July 2008 at 1:25pm |
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how could we have modeled the porn horn when we dont know the dimentions of the horn
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darkmatter
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Joined: 26 February 2005 Location: LDN Status: Offline Points: 2425 |
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Posted: 24 July 2008 at 7:32pm |
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apparently... 12" pornhorn: horn lenght 68 cm, horn mouth 50,3× 60,4 cm, round horn
throat of 32 cm diameter mounting a phase plug of 15,2 cm diameter
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adambomb
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Posted: 24 July 2008 at 8:03pm |
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I have (well Rog has actually) clipped an ep2500 into one... light pretty much on constantly.. SN12B loaded... still sounded fine (clip limiters were engaged).
I know that's nothing to go by... not exactly a serious amp (think thats about 350wrms?).
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mobiele eenheid
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Joined: 15 August 2004 Location: Netherlands Status: Offline Points: 1568 |
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Posted: 24 July 2008 at 10:59pm |
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For modeling pornhorn's it might be interesting to know the front chamber size but it's common sense to model it as small as possible. IIRC Rog noted that the rear chamber should be as small as possible and preferably even a bit smaller. Meaning it will be harder to get over-excursion as a better job on the latter is done.
Regards Johan
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snowflake
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Posted: 25 July 2008 at 8:45am |
thanks, have put a model together based on these dimensions. comes out pretty close to measurement except a big dip around180Hz. tried changing front and rear volumes and T factor but can't get rid of it. are you sure about the size of the phase plug? looking at the diagram on http://www.proaudioparts.co.uk/pornhorn.asp the throat looks well less than half the cabinet width - about 28cm diameter and the plug less than 14cm diameter...
Phil Edited by snowflake - 25 July 2008 at 8:56am |
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darkmatter
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Posted: 27 July 2008 at 11:57pm |
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no idea on it's accuracy i'm afraid mate, just copied and pasted that straight out of a post on freespeakerplans
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snowflake
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Posted: 28 July 2008 at 1:50pm |
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okay found that post, have PMed Bitzo asking him to confirm dimensions.
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bitzo
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Posted: 28 July 2008 at 2:21pm |
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Hi all,
I see your PM snowflake, you're right throat is quite larger I've corrected the value. I calculated it from the plot posted by rog, the diameter is 26 cm. However I search to model it on hornresp but it's really difficult. For 2 reason Hornresp model round horn, the throat and the compression chamber belongs to the phase plug and there isn't plot of that. Edited by bitzo - 28 July 2008 at 2:47pm |
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snowflake
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Posted: 28 July 2008 at 3:25pm |
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thanks, I will try modelling again with a throat of 400cm2. if the front chamber is very small the precise value does not matter. I will try some different rear chamber sizes and post the results up. if i can't get near the measured response I will try altering the expansion rate.
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bitzo
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Posted: 28 July 2008 at 3:36pm |
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uhmmm for mid and tops just model a cylinder on the driver dimension, (driver depth+some cm)×(external driver diameter/2)^2×3.14. A bowl have less volume so I moltiplicate the result with a factor of 0,8 - 0,7.
Edited by bitzo - 28 July 2008 at 3:47pm |
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darkmatter wrote: