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Full Range Driver Research Project
Full Range Driver Research Project
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Old 12th September 2009, 08:55 PM   #1
lpgfullrange is offline lpgfullrange  Brazil
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Default Full Range Driver Research Project

Is anyone in the community interested in doing some lab tests with different drivers and different cabinet designs?
Iíve built Fostex MLTQW speakers in the past, and I generally enjoy researching different speaker drivers. Iíd like to build some new speakers comparing different drivers, though I donít like the research thatís out there because each speaker designer does their tests in different environments.
What I want is a catalogue of real world frequency response charts and waterfall plots, to compare to the manufacturerís T/S parameters and computer simulations.
Ideally, I would like do some independent lab measurements with several drivers and cabinets, all done in the same room environment and equipment.
We could make it a group buy, and collectively pay for the lab/measurements perhaps even loan our drivers and cabinets temporarily to get it done.
Has this been done before? If not, who wants to do it with me?
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Old 18th September 2009, 01:56 AM   #2
lpgfullrange is offline lpgfullrange  Brazil
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No takers? Any suggestions where else I should post? Thanks!
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Old 18th September 2009, 05:27 AM   #3
chuyler1 is offline chuyler1  United States
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Since I'm a software engineer and work with rich internet technologies like adobe flex and flash, I keep tossing around in my head this idea of an internet app that contains a repository of all the current open-source box designs, actual T/S parameters for popular drivers, and calculators for common box designs. With Flex and Flash, you could even render box plans for people to print out.

Frequency plots and comparison reviews would be a great part of such an application, but in order to get accurate information, all speakers would have to be analyzed in the same room as you said...and it would always beg the question, what will it sound like in a larger/smaller room?

THe application could also be user-based, so a user could login and submit photos of speakers they have built and the database could keep track of how many people build each design.

Do you think such an application would be useful to the community? Or would people just continue to post over and over again the same questions on forums looking for a different answer.
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Old 19th September 2009, 01:13 PM   #4
Colin is offline Colin  United Kingdom
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Have a look at http://www.zaphaudio.com
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Old 20th September 2009, 05:01 AM   #5
ChrisA is offline ChrisA  United States
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Look what Eminence has done with some of their drivers. Of course you'd want to do it differently but this kind of gets the idea, you can actually listen (with a pair of good studio headphones) to each driver used three different ways. I don't know how you'd work this with HiFi speakers. But this actually provides sound sample in MP3 format.

Perhaps you could make a web site where people post raw recording made with a measurement mic and describe the room and amp used. Maybe even provide a "standard" audi track in FLAC format. Say a solo piano, jazz, vocals and so on.

Here is the link

(I bought the Legend GB128)

Last edited by ChrisA; 20th September 2009 at 05:05 AM.
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Old 11th April 2012, 08:34 PM   #6
fakeout is offline fakeout  Canada
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I kind of like this idea although I wouldn't mind seeing tests on Wavecor and Beyma.
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Old 11th April 2012, 08:42 PM   #7
tuxedocivic is offline tuxedocivic  Canada
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Originally Posted by fakeout View Post
I wouldn't mind seeing tests on Wavecor.

After March 31, 2011 and before Feb 20, 2011. Not a full ranger though.
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Old 11th April 2012, 10:40 PM   #8
planet10 is offline planet10  Canada
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Full Range Driver Research Project
to compare to the manufacturerís T/S parameters
actual T/S parameters for popular drivers
What does actual T/S parameters mean? I have never seen any truly representative parameter sets published. I have seen lots of points taken off the curves (which leads to the misunderstanding that T/S are scalars).

From experience the points taken using LMS or LEAP tend to give the most reliable starting point when you actually build a box.

A set of actual T/S parameters would be a multi-dimensional chart for every parameter.

For an accurate representation of a speaker in the frequency domain an anechoic chamber is really needed, and the ability to take the complete set of curves specified by Toole.

community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
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