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Old 19th July 2006, 06:23 PM   #11
no xo is offline no xo  United States
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Right on Bob. How much $ per hour does that work out to be?
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Old 19th July 2006, 06:52 PM   #12
john65b is offline john65b  United States
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Huh? I thought DIY was "open source", and that profiting from DIY was not the in the spirit of DIY...

I would hate to pay big bucks for a self promoted, hyped up amp/speaker design that may ultimately dissapoint... since there's no way to audition or prove the design...

If a free DIY design does not pan out to my expectaions, I only have myself to blame, but to pay for a design is another story.

Maybe this guys designs are worth every penny, but again, seems out of context for DIY...

I say stick to the free, where there no conflict of interest. If you want t buy a design, get something you can audition for yourself... or temper your expectations...

After all, it's your money...
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Old 19th July 2006, 06:55 PM   #13
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Quote:
Originally posted by Bob Brines


$25 for God's sake! You want ten years of hard work out of the man, and you begrudge him a little return on his efforts? Pay the man his dues and get the REAL answers to your problems.

Bob
Well, the biggets reason I don't want to pay for anything is 1) I'm just curious about the DBR/DCR design and 2) I don't plan on building one since I haven't even completed my normal ported sub. 3) I don't think I'd put that cost to good use since I don't have any practical reason for designing transmition lines, horn loaded systems, or any of the more exotic systems at this point in time that his worksheets model. I'm just curious about how these systems perform. I don't have the time or money to build any of these (poor highschool student speaking here).

Lastly, the problem with my parents come into play. I doubt I could convince them to pay for something online (I assume you need a credit card or something to pay online) from somebody who they don't know and doesn't have a business registered with the BBB where they could check the credibility. I know he wouldn't be out to rip us off, but convincing my parents is another issue.

I'm not trying to rip him off from his hard work. No offense was meant; my quest for a simulation of a DBR/DCR was more of a curiosity than any practical need.
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Old 19th July 2006, 07:18 PM   #14
no xo is offline no xo  United States
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Lightwavedude and john65b, my feelings are, we pay for the parts, materials and all other necessary elements that go into making or designing speakers. I believe that proven information is a necessary element, just as drivers, baltic birch and all the other stuff(ing) which help us achieve our goals,and are of value. Usually we get what we pay for. Free is almost always good, but to get the right info, parts, ect., cost is usually asssociated. I don`t think either one of you are wrong, I just post my opinion with hopes not to offend anyone. I am a greenhorn (new to horn building and DIY), and this site has helped me have more fun with audio than I`ve had with 30 yrs of playing with commercially built speakers. My expirience is limited, my opinion is not. Have fun and enjoy the process. NOXO
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Old 19th July 2006, 07:26 PM   #15
MJK is offline MJK  United States
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Stick to free.

Do it yourself.

Those are how I got started and well worth the effort in my opinion if you really want to learn speaker design.

You will learn more, understand more, enjoy the outputs of your designs, and take great satisfaction in the results of your efforts. The longer road to success, took me 20 years.

Best of luck to you both,
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Old 19th July 2006, 07:40 PM   #16
john65b is offline john65b  United States
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Halleluiah!!!

I mean no offense, sir, and glad you can agree.

There is much to be learned in DIY...otherwise we all would be watching Oprah right now......and listening to Bose speakers (ouch!)
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Old 19th July 2006, 07:49 PM   #17
no xo is offline no xo  United States
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Martin, maybe I should have worded my reply like this, I value your attitude and your research. Thank you
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Old 19th July 2006, 07:53 PM   #18
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All I will say is that Martin's worksheets are a tool, just like a decent soldering iron or router. As with all tools, what you do with them is up to you, but the right tool makes the job so much easier and more enjoyable.
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Old 19th July 2006, 08:13 PM   #19
MJK is offline MJK  United States
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Quote:
I mean no offense, sir, and glad you can agree.
No offense taken. I appreciate the support of the other people posting comments.

DIY is great and people work to different levels. If you have the engineering/math background and are willing to invest time reading, studying, rederiving equations, and then programming the results it is a real fascinating exercise and hobby. I have been working at it on a part time basis for over 20 years. I have a lot further to go.

So the DIYer has to decide to spend the time (maybe you are quicker then I am) or spend the $25 to accelerate the process. I rarely spend money on software when I can do it myself and in my own way. For me half the fun is deriving and programming the software and then correlating it against test data. You learn more this way, but it is hard work.
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Old 20th July 2006, 02:55 AM   #20
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Martin, I'm wondering if you can supply exactly what I'm looking for. Can you do something to visually represent what a DBR will do to cone excursion? Can you just give a plot of excursion of any driver in a normal bass reflex design and then give an excursion plot of the same driver in the equivalant DBR box?

I was mainly looking for modeling software not to design my own system but to understand the descriptions I was reading... the biggest confusion of mine being the excursion of a DBR box. I've read that it helps full range drivers in that it reduces cone excursion in two pass bands, but how much of a reduction?

If I ever get the money to start designing more systems, and systems that aren't the standard sealed or ported enclosures, I'll definitly look into your worksheets. The tutorial page looked like your worksheets cover just about everything, and they could be very valuable tools. Unfortunately, you won't have an invester out of me yet, but I admire the work you have put into the worksheets.

Also, I too am glad you didn't take any offense. I didn't want to come across as demanding everything come to me for free.

Thanks, Logan
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