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Old 31st August 2012, 04:28 PM   #21
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@Djim : the #14 post looks interesting, my main thought is what that might mean in terms of characteristics, what will it influence ?

It takes away a minimum of volume in the system wich is appealing, also I inclined to think that it may also act as a form of diffuser, reducing unwanted resonances.

On the other hand I'm curious as to the effects on cone balance when you "use them in anger" as I believe it is called, meaning when you push the system to it's limits, will the semi-enclosed volume act with grater force then the open slanted side leading into the horn ?

In either case, very interesting, even if only having (probably) a minute positive contribution, if any, it's a rather simple thing to try if one where to build new ones.

Thanks !

I myself skipped the car audio era of my time, I was to busy trying to figure out how to get the attention of the ladies, which might have been a catch 22 now that i think about it

I was however frequently involved in designing several of my friends systems, eehhh... so that they could *facepalm* get the above mentioned attention... darn... (currently looking like the guy in post #12)

Last edited by martinsson; 31st August 2012 at 04:33 PM. Reason: spelling (my swedish is far better, but that would not help you...)
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Old 31st August 2012, 05:33 PM   #22
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ok... now this cone correction looks interesting , found a post about it earlier.
It seems Mr Danley had a cut-through section on his TH118 .. but has since taken it off the site .. DAMN!! .. would have been interesting to learn a bit more about this.
If anyone has any information please feel free to message me.
Not sure whether to continue the builds (finally started cutting today) or wait and find out more about cone correction
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Old 1st September 2012, 12:17 AM   #23
Djim is offline Djim  Netherlands
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Hi Anders,

My examples for the cone volume correction in my earlier post were just a quick brainwave and I have not worked them out yet. Was more meant to create awarenesses to the cone volume.

As you mentioned in an earlier post, your Tham is a little more difficult to simulate with HornResp. Although I agree that HornResp has limited horn parameters you still can get a relative accurate picture if you model it with the correct volumes at S2 and S4 as result of the cone volume (2) and the volume taken by the driver (S4). The importance in modelling is not to get very accurate areas at just the locations of S1, S2 S3, S4 and S5 but instead, you better strive to more or less accurate volumes per section. If you do so, it will end in a more accurate internal volume of the system.

For instance the Tham's internal dimensions are 51,4 x 64,4 x 46,4 cm which ends in a system volume of about 154 Litre. With that in mind, and the volume taken by the driver at S4, I made a new model that is very close to its measurement:

Click the image to open in full size.

The roll-off at the low end is not correct as result of the changing stiffness of the internal volume as frequency goes down. This will result in a better response compared to its measurement but can simulated by increasing the Le value by factor two for instance. It should be noted that changing the Le value can only be used to analyse the result for the roll-off.


Last edited by Djim; 1st September 2012 at 12:19 AM.
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Old 1st September 2012, 12:36 AM   #24
Djim is offline Djim  Netherlands
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Measurement from Anders Martinsson . Purple line is based on the 'old' design as used in the sim of above.

Click the image to open in full size.
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Old 5th October 2012, 01:43 AM   #25
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JohnnyPyro, have you built the test boxes yet? I too have 8 15PZB40's looking for new bass cabs and have been wondering what they sound like in these designs. They sim real nice in the THAM15 and Xoc1's TH-18.
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Old 10th October 2012, 09:43 PM   #26
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Quote:
Originally Posted by JohnnyPyro View Post

It seems Mr Danley had a cut-through section on his TH118 .. but has since taken it off the site .. DAMN!! .. would have been interesting to learn a bit more about this.
Is this what you are looking for?

TH 115

Cheers

William Cowan
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Old 11th October 2012, 09:25 PM   #27
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Quote:
Originally Posted by cowanaudio View Post
Is this what you are looking for?

TH 115

Cheers

William Cowan
William,

Is the TH-118 any different internally than the TH-115 ?

Art
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Old 11th October 2012, 09:58 PM   #28
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Quote:
Originally Posted by weltersys View Post
William,

Is the TH-118 any different internally than the TH-115 ?

Art
G'day Art

I've read that they are the same. I could imagine the driver mounting panel is quite different though.

Cheers

William Cowan
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Old 12th October 2012, 01:31 AM   #29
djk is offline djk
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They are a different length, that can be seen in the impedance curves.
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Old 12th October 2012, 05:11 PM   #30
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Quote:
Originally Posted by djk View Post
They are a different length, that can be seen in the impedance curves.
Dennis,

The TH-115 spec sheet has an impedance curve, but don't see one on the TH-118 spec sheet, do you have one you could post?

Art
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