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Kick horn – Phase 2 |
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Timber_MG 
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Joined: 27 March 2004 Location: South Africa Status: Offline Points: 1454 |
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 Posted: 08 November 2004 at 9:42am |
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Ok here are some basic sims
I used the Challenger 12-500MB from P.Audio. I modeled two option, one bigger 57x77 front tailored for use in smaller stacks and one smaller 60x40 front horn made for use in stacks of 4 on a groundplane. On the below graphs blue indicates larger horn and grey the smaller horn. The interresting bit is the SPL @ 500W input per unit comparing a stack of two big vs four small horns. I'll let the graphs speak for hemselves. Please note that these don't represent optimal cases and only serve to show a general trend. http://homepages.paradise.net.nz/sbk1/speakerplans/martin/4s mal_vc_2big.png http://homepages.paradise.net.nz/sbk1/speakerplans/martin/4s mal_vs_2big_same_power.png http://homepages.paradise.net.nz/sbk1/speakerplans/martin/fo ur%20groundstack.png http://homepages.paradise.net.nz/sbk1/speakerplans/martin/tw o%20groundstack.png http://homepages.paradise.net.nz/sbk1/speakerplans/martin/si ngle%20groundstack.png Martin |
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Timber_MG
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Joined: 27 March 2004 Location: South Africa Status: Offline Points: 1454 |
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Posted: 08 November 2004 at 9:47am |
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This time with clickable links
4 small vs 2 big 4 small vs. 2 big same power single ground stack two ground stack four ground stack Martin |
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whitehousejamie
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Joined: 08 March 2004 Location: United Kingdom Status: Offline Points: 1485 |
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Posted: 08 November 2004 at 1:09pm |
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Mmmm, the 4 small horns in a stack appear to make a bit of noise.
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Timber_MG
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Posted: 08 November 2004 at 1:52pm |
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Add roughly 3dB becasue McBean models power response and you gain an extra 3dB by virtue of the floor. Power comperession doesn't figure into this, but giving them a kW each and if we can get the driver reverse mounted a la Bark a stack of 4+ should do a fair bit of damage if the program material isn't overly compressed. It might also be a nice playmate for the X1, which would make such a thing portable.
Martin |
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norty303
Old Croc 
Joined: 18 August 2004 Location: Eastbourne Status: Offline Points: 8800 |
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Posted: 08 November 2004 at 1:58pm |
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@Timber_MG Not sure if IE supports .png but can you not put the url's in [img][/img ] tags to display the pics on forum rather than the links.
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My laser stuff: Frikkin Lasers
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Timber_MG
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Posted: 08 November 2004 at 2:02pm |
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That way I could bankrupt poor old Mike who is kindly providing bandwidth atm. Unfortunately (this is a religious issue) I can only say switch to a standards compliant browser. IE 6 supports PNG, dunno about earlier versions. Both Opera and Firefox are nice alternatives.
Martin |
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RayVaughn
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Joined: 20 August 2004 Status: Offline Points: 62 |
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Posted: 08 November 2004 at 2:09pm |
The server will only include a reference to the image which will be downloaded form it's original location by the browser so there's no problem with server bandwidth using [IMG] tags. |
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---------------
Ray Vaughn and on www.innerfield.co.uk www.rocketfestival.com |
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roborg
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Joined: 05 July 2004 Location: United Kingdom Status: Offline Points: 1026 |
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Posted: 08 November 2004 at 2:16pm |
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The bandwidth is just about right for me! To throw a spanner in the works, i really think a straight horn is in order, by itself its probably too long to be practical...
So how about a two piece cab  ? IE a driver end, with the first 40-50cm of a straight horn & a bolt on horn expo to take it to 1M or whatever
If we design it cunnily we would end up with a really flexible speaker. Leave the horn extension off & u get a mid-range cabinet, IE a narrow dispersion MT102! Add the horn extension & u have a good kick cab. So you could wang it into the back of the car with an X1 & mt102 for a small party. Or take four along with 4 labhorns or X1's or 1850's etc.. for the big event. |
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What I cannot create, I do not understand
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loophole
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Joined: 02 March 2004 Status: Offline Points: 469 |
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Posted: 08 November 2004 at 2:29pm |
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2 points:
a ground plane extension should be a bonus for those looking to stretch the limitations of the kick cab. they should do their job fully and as planned when stacked on top of several lab horns a straight horn seems the obvious way to go, even made in one part. we'd be talking about a total cabinet length of about 135cm and with its small width and height that would be easily managable. folded horns are by their very nature a compromise, and given an opportunity like this, where a straight horn is not a ridiculous idea, i think we should go for it. and people interested could experiment with adding phase plugs/waveguides and extending the response as far as 1khz |
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Timber_MG
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Posted: 08 November 2004 at 2:45pm |
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Response out to 1kHz would mean a differrent design, as one makes a trade-off between bandwidth and efficiency. Also a kick cab would be pushed hard and I wouldn't want it running that high out of fear of making a mess of the midrange. I don't think that the folding is a problem in the bandwidth we're looking at (200-250 hz max) as the Bark folding allows a long smooth bend fairly reliably done with WH Geiger's spreadsheet one is told.
I recon one could come up with two versions, as it is fairly easy to draw up a straight cab. 2-3 conical sections should be more than sufficient. Martin |
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whitehousejamie
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Joined: 08 March 2004 Location: United Kingdom Status: Offline Points: 1485 |
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Posted: 08 November 2004 at 2:49pm |
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Would using a straight horn mean less output around 70-80hz?
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loophole
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Posted: 08 November 2004 at 3:02pm |
sorry this was just an idle suggestion, my point was not really that we would want to actually do this, but that a straight horn leaves more options open for experimentation afterwards (the type we all know roborg for ;) ) what i don't understand is quite how you're going to fit a 1.2m horn path into a folded cabinet that is 60x40. maybe im just being stupid, and it is much easier than i think, but it does all seem very cramped jamie: a straight horn when compared to a folded with the same parameters will always outperform the folded, except in size! don't be fooled by the fact straight horns are just used in midrange, they potentially can pump out devastating bass as well. folds are compromises, it just matters less in bass than higher frequencies |
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Timber_MG wrote: