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Old 18th July 2012, 10:10 AM   #1581
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Join Date: Dec 2010
Location: Coffs Harbour NSW 2450
heres what im using at the moment. and quite clearly, as per the massive spike at around 45hz, is why it has that booming deep rumble property and nothing else... lol

Black= Fusion EN-SW12HD (its a 12inch DVC car sub.) vs Grey= Kappa Pro

Click the image to open in full size.
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Old 18th July 2012, 12:43 PM   #1582
Phil B is offline Phil B  Australia
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So Mr r23d has finished the final pair of SS15`s and all the Unity horns...Here they are on their first outdoor outing.

Click the image to open in full size.


Click the image to open in full size.

We`re running the SS15`s up to 200hz at the moment which is not ideal and we`ll be working on either a third tap on the Unities or a low mid horn....

More to come!

Phil
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Old 20th July 2012, 03:05 AM   #1583
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Join Date: Dec 2010
Location: Coffs Harbour NSW 2450
i have a question regarding just my first built cab.

i built it as an SS15, but knowing i was only using a 12inch driver. this particular cab is active, so has the amp on the back, what im wondering, is that the amp has potential to drive this one cab differently to two others even with the same driver in it. so, if i do decide to keep it as a one off for smaller gigs, im thinking about leaving the 12inch hole as is, but putting a spacer ring on it so i can still fit the 15inch driver and not have the suspension slap the baffle board.

will having a 12inch hole act like a compression chamber? how would i be best to simulate this on HR??
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Old 20th July 2012, 03:10 AM   #1584
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Do it the other way around. 15" hole and use a 12" adapter plate.
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Old 20th July 2012, 03:12 AM   #1585
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i currently have a 12inch driver in it. so it has a 12inch hole.

i want to use a 15inch driver in it but dont think i can get a jigsaw in there to make it 15inch.

so its either leave it as 12inch, or make a standoff ring 15inch diameter
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Old 26th July 2012, 01:51 AM   #1586
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Quote:
Originally Posted by jbell View Post
Ok, so my friend DJIM gently got me to act on this.... I haven't touched the ss15 design in months -- it just works so well.

The only downside for me, is that it is not a 'flat to 40' box. And I'm big on flat to 40.

So, a bit of 'S2 cone correction' instead of a compression plate.
1" taller and 1" narrower...
and the SS15 can now hit with authority an honest to goodness 40hz.

This is still on paper and hornresp only, and it'll be a week or so before I can build/test... But I do have assembled 'original' SS15 cabinets, and I can do an A-->B comparison.

It "should" eliminate the one glaring weakness I see in the ss15. And it still does it from a single sheet, but this time you really do have nothing but sawdust left over... You even have to use the driver disk cut out from the baffle board as bracing.

Any more on this?
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Old 26th July 2012, 02:12 PM   #1587
epa is offline epa  Netherlands
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i was looking at this
Click the image to open in full size.
this cone corection is only 2 dimensional
a cone has 3 dimensions.
i think creating a chamber would help to save the cone(at the expence of a dip above 100 hz)

Click the image to open in full size.
mij new project is a conical rectangular th with chamber with the 18 sound 21nlw9000.
chamber size depending on the 8 or 4 ohm version>depending on wich amp.
probaply powersoft 3000pfc or pwr dsp1
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Last edited by epa; 26th July 2012 at 02:25 PM.
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Old 26th July 2012, 03:05 PM   #1588
fhperez is offline fhperez  United States
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EPA or anyone else... how would I take that design and plug it into HornResp??

For example if I wanted to tweak the SS15 on paper, how do I translate the s1, s2, s3 numbers to get an estimated response?

Reason I am posting here and not in another thread is because I also want to help out with calculations while learning more about hornresp and TH Design...
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Old 26th July 2012, 09:11 PM   #1589
tb46 is offline tb46  United States
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Hi fhperez,

Take a look here: Simple Tapped Horn Tutorial using Hornresp

Regards,
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Old 27th July 2012, 07:56 PM   #1590
Djim is offline Djim  Netherlands
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Quote:
Originally Posted by epa View Post
this cone corection is only 2 dimensional
a cone has 3 dimensions. i think creating a chamber would help to save the cone(at the expence of a dip above 100 hz)
Hi Epa,

Cone correction doesn’t need to be three dimensional. Acoustic-air only reacts to volume in relation to its position on the horn-path. If that wasn’t the case we couldn’t use braces at all.

Quote:
Originally Posted by epa View Post
mij new project is a conical rectangular th with chamber with the 18 sound 21nlw9000.
If you really want to use a chamber make sure you optimise the throat by a 'trumpet' shape rather than 'sharp' angled corners and if possible position the throat on the opposite side of the centre of the driver.
Never worked with that driver but it looks like a 'heftig dingetje' ;
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