OB help!

[buzzforb]

Has anyone used ABC dipole program with any success? I would like to model some preliminary OB ideas. Looking for best software options.

[twest820]

I get the impression Edge and Linkwitz's SPL spreadsheets are probably the most popular tools. They've worked well for me.

[hitsware]

use any simulation that allows for a first order LP
(like a capacitor in series with) the driver
use sealed mode with infinite volume ......
.... I.B.
360/(baffle diameter(in feet)) ~ 3db down

[gainphile]

I've used ABC Dipole and it's one of the best investments in audio at $15.

Not only the dipole simulation, I found the notch designer very neat and useful to determine excact frequency and Q

[buzzforb]

Thanks for the replies. I have seen all the above mentioned programs. I know the MJK software is well respected and Martin spoke of the edge when he did his OB design, but seemed to stop short of recommending it. ABC dipole seems to include everything like MJK so i guess it will be between those two. Gainphile, I have read a lot of your blog with a great deal of interest. I may try to do something similar to your s12 OB. I hadoriginally been looking at the JAMO r909 which is also similar. THinking about using Emimence 12LFA, with either Wild burro Betsy or new Alpair 10.2 for midrange, and either Vifa d26nc55, Seas 27tdf, or Neo 3pdr for highs. I guess we will see

[buzzforb]

Gainphile,
Have you gone any further with naked bipole? Could the midfange be surrounded with a baffle like those seen on some of the fullrange enclosures?

[buzzforb]

Gainphile,
What do you use for reponse measurement since you seem to be tribal minded and I don't have a lot of money to invest in testing equipment. Have you given up on naked dipole concept?






Ll?

[buzzforb]

Sorry about double post. I meant frugal not tribal. Stupid phone.

[gainphile]

lol... for measurement I use something like this

Gainphile: Cheap and accurate speaker measurement

I experimented naked (somewhat) baffle but for reasons I don't understand they did not sound correct. Although they measured well.
gainphile.blogspot.com/2010/02/s13-ob-fullrange-dipole-tweeters.html

[gainphile]

Originally Posted by buzzforb

I may try to do something similar to your s12 OB. I hadoriginally been looking at the JAMO r909 which is also similar. THinking about using Emimence 12LFA, with either Wild burro Betsy or new Alpair 10.2 for midrange, and either Vifa d26nc55, Seas 27tdf, or Neo 3pdr for highs. I guess we will see

The relation between midrange diameter and baffle width is critical. There is a reason why Orion, Nao looks that way.

Jamo's 909's 5" midrange is acoustically to small for that wide baffle which caused major frequency dip and irregularities on the above spectrum. This behavior is well known and you can see it in various independent measurements of the speakers. Try to simulate that with ABCDipole and then try to change the baffle width.

The Tweeter section is always an achilles heel. Have a read on "Nao Note" to see why John had to go to all that trouble with such weird looking baffle. I simply choose to live with it