Hawaii 5.0

[planet10]

Originally posted by gmilitano
As mentioned, the Five-O is for the 40-1354. For interest sake, here is a link:

http://www.myhifisite.50megs.com/hawaii.html

Speaking of that site has anyone heard from Steven Brown?

dave

[planet10]

The "standard" BR for the 1197 is based on 12"x8"x6" internal dimensions with a 2" diameter port 3" long. (the Terry olsen 1197 BRs i mention in the NorthWest DIY-fest thread.

dave

[Kofi Annan]

Thanks for all the responses.

Did we talk? Kofi Annan certainly wasn't there, so who are you?

Kofi Annan was there, alright. He was disguised as an average height, mid 30-ish white male with wife in tow donning a flannel shirt with a rip in the right elbow. He hung around mostly with the person you know as "Woody", but who is really Silvio Berlusconi in an equally clever disguise.

Perhaps I've said too much.

Anyway, I've been messing with Martin King's TQWT MathCad program and its really, really interesting. Being a total amateur, all I really know is that I want to get as flat an SPL response as possible, right? [Please respond with mockery, as necessary]

So, I searched on the Full Range Driver forums and found the t/s (love using the lingo-- makes me feel like a badarse) parameters for the 40-1197s. I've been reviewing the resulting graphs and I have some questions.

Questions? Me?

Attached is a copy of the graph entitled Far Field Transmission Line System and Infinite Baffle Sound Pressure Level Responses. I'm assuming this is the SPL for the entire system, not just the driver.

Based on a comparison of this graph to the "ideal" one posted on MJK's site, it looks pretty flat above 100Hz, but I have some problems below that.

Am I reading this right? Are there other graphs that a total amateur like me should consider?

I really don't know what I'm doing, so any help would be much appreciated. I am continuing to read the information on MJK's wonderful site, but a shove in the right direction would be well received.

You have every reason to come down on me for not knowing nuthin', but if during the course of your admonishment you could offer some helpful advice for the learning challenged, then I promise that you will all be in line for cushy government positions in any new country created from the turmoil of a military coup.

Thanks,
Kofi

[planet10]

Looks like you are tuning the "restricted terminus" too low.

I've sent GM a sketch to fill in the blanks, and i'll post the drawing of his design here (and put it on my website, since it is on-topic) -- actually i could probably start a whole section of GM designs -- his helpful nature has spawned many useful designs for the community.

dave

[Kofi Annan]

[B]Looks like you are tuning the "restricted terminus" too low.[/B[

Not again! (Kidding, of course)

I would really love it if you got the design for GM's MLTL posted on the web. I enjoyed listening to those quite a bit at the Atlanta DIY event.

By the way, I got your phase plugs in the mail on Saturday. I ran up to a friend's house to install them in the FE103 backhorns (loaded with the 1197s) that I made for him a few months ago. I Have a hard time expelling the technical jargon, but they really made the 1197s sound very present and it sounds like the high-end distortion is completely gone now.

I used a hair dryer to apply heat to the dust cap and it came off pretty easily, with a bit of delicate prying. Also, I "damar-ed" the cones and added modeling clay to the frame.

Thanks for sending those plugs so quickly-- they're fantastic. Once I get my hands on the GM design, I'll make a set of them and upload some photos.

Thanks,
Kofi

[planet10]

Originally posted by GM
Folks seemed to like the folded Voigt pipes loaded with DD's tweaked 40-1197s I slapped together for something to bring to the Atlanta DIY Meet a couple of weeks ago.

1st the picture...



Note that it is upside down in this pic from http://www.patcave.com/diy2k4.html

And the drawing is attached. I'll be gathering the comments i've received & the pics together into a webpage on my site.

dave

[planet10]

Originally posted by Kofi Annan
I got your phase plugs... they really made the 1197s sound very present and it sounds like the high-end distortion is completely gone now.-- they're fantastic

:^)

can i quote you on my website?

dave

[Kofi Annan]

Thanks for posting the design! I'll get busy on these tomorrow.

can i quote you on my website?

Of course! You can either use my real name (Kofi Annan), or the name of my secret identity, as sent to you in my many E-mail inquiries on Canadian emigration.

Thanks to Dave and GM for all they do for the DIY Audio community!

Kofi