New version of Martin King's MathCad Worksheets is coming soon!

[lovechild]

Originally posted by GM
Greets!

I bet Tom Danley wouldn't be too pleased to see it made public.

GM

...has been public already

best, LC

[GM]

Greets!

Not the design per se, it's ancient history, but a program to accurately model it and what you can get by playing with lengths, CSA, and particularly driver and/or vent location.

GM

[GM]

Originally posted by planet10


?

Greets!

http://db.audioasylum.com/cgi/m.mpl?...ex&r=&session=

GM

[e-star]

I also believe that tapped horn is something similar. I experimented with that kind of enclosures and results are promising (at least for PA). I am looking for the smalest and loudest pa sub ( uff. problematic statement)

Cheers Bostjan Skok

[MJK]

Hi Bostjan,

Jensen Transflex is a transmision line enclosure but the driver is enclosed in a enclosure. I will start a new thread in a subwoofer forum if there is any posibility to simulate this enclosure with worsheets.

The worksheets available, original and upgraded, will not accurately simulate this type of enclosure design.

I thought about the problem yesterday and concluded that a worksheet to model this type of enclosure is possible. It would require some rearranging and extension of the math but I believe it could be done. Unfortunately, it is not on my list of priorities and can only be classified as something interesting to look at if I ever run out of things to work on (there are a few other enclosures on that list also).

So let me ask a couple of questions :

1. What is special about the performance of this design compared to a classic TL?

2. What performance advantages does it offer?

3. Where is this design used and over what frequency range?

If there is some performance advancement possible with this geometry that would be interesting, if this is just an old design cobbled together by a very creative thinking individual that sounded good compared to state of the art at that point in time then I am not sure this is worth pursuing. Is the Jensen Transflex just another Karlson or Hageman style of exotic, outside the norm, or curiousity enclosure that appeals to a small group of enthusiasts or is it truely a high performance design that has fallen through the cracks?

[bzdang]

Tom Danley posted some information about the tapped horn concept in these places -

http://srforums.prosoundweb.com/index.php/m/0/8829/32/0

http://srforums.prosoundweb.com/index.php/m/113362/0

Near as I can understand he's using 1/4 wave phenomena to compensate for the compromises introduced when deliberately making a horn 'too small'. And probably has all the math worked out to simulate and design the things. Innovation.

[soongsc]

Originally posted by bzdang
Tom Danley posted some information about the tapped horn concept in these places -

http://srforums.prosoundweb.com/index.php/m/0/8829/32/0

http://srforums.prosoundweb.com/index.php/m/113362/0

Near as I can understand he's using 1/4 wave phenomena to compensate for the compromises introduced when deliberately making a horn 'too small'. And probably has all the math worked out to simulate and design the things. Innovation.

It seems like a design that could reach very low frequencies, but will have some peaks and dips along the way down due to phase differences. It would be interesting to see if those can be flattened.

[bzdang]

Another of his posts, more explanation.

http://www.audioroundtable.com/BillF...ages/4103.html

[Elam]

Hi,

I'm already using the new worksheets and I'm very pleased. The simulation correlate *very* well with my in-room measurements.

One thing I'd like to see in future versions of the worksheets is the in-room respond above 1kHz. Maybe up to 3kHz. Then I wouldn't have to use 'The Edge' anymore for my narrow baffle speakers.

Bye, Elam

[Zoran]

Hi
Nobody answered
or comment something
about my post at page 20...
Thanks in advance