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Multi-Way Conventional loudspeakers with crossovers

getting to test many speakers for FR
getting to test many speakers for FR
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Old 8th January 2009, 02:26 AM   #11
Iain McNeill is offline Iain McNeill  United Kingdom
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Quote:
Originally posted by Ron E
Le is a useless measurement other than giving an order of magnitude for advertising purposes. An impedance curve is far more valuable.
With respect to high end drivers with underhung coils yes, but many speakers have Le that varies with excursion. This is a big distortion generating mechanism and can mess with your crossover actual vs designed response. I suspect it can introduce phase errors as well (phase shift vs excursion )

edit: it can be asymmetrical as well meaning the harmonics generated are odd.

I would propose that the dynamic properties of Le for a particular design should be understood before being dismissed.
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Old 8th January 2009, 02:36 AM   #12
Ron E is offline Ron E  United States
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So Iain, where do we disagree and how does your post follow from mine? He doesn't have equipment to measure varied Le vs excursion and the existence of varied Le with excursion (and frequency - see the wikipedia link above ) merely further underlines my statement that an Le "spec" is essentially useless.
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Old 8th January 2009, 03:10 AM   #13
Iain McNeill is offline Iain McNeill  United Kingdom
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Sorry, I have a habit of reading threads backwards.
I took exception to your bold generalization without reading the context.

In the grand pareto of things to be worried about when building speakers, Le vs excursion is way down there. As you say, it's almost impossible to measure without a Klippel system and as long as you aren't running your speakers at the power limit, it won't ever be an issue.

But in the quest for the best, it should be considered. THD vs frequency vs output level captures all these 2nd order effects and suggests a maximum listening level for quality reproduction.

BTW, nice work on the T/S wikipedia entry - one of the better texts!
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Old 23rd January 2009, 07:24 AM   #14
mcmahon48 is offline mcmahon48  United States
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Default further information before getting started

I am working on getting the wiring set and learning speakerworks
will be using speakerworks
12" x 12" baffle speaker mounted in the middle and raises about 30 inches
will be starting with tweeters since I can gradually increase the cut on the baffle
will be doing 2 tests on speakers that have a Qts<.4
first test without fiberglass batting
Second test with
nest will be enclosed midranges should a midrange fit in the same cutout as a tweeter it will be tested at the same time
The results will be T/S parameters will be in excel format
You will have to ask for a file transfer by email to see what file goes with what speaker for some I have no idea who the manufacturer is or what model Why wont that capacitor fit there This will make the speaker fit Hitting this tweeter with a hammer will flatten that frequency response
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Old 29th April 2009, 03:56 AM   #15
gapmedia is offline gapmedia  Australia
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Hello mcmahon48,

I am having trouble installing Speaker Workshop on a laptop, all fine on my big grey box PC though.

As you mentioned earlier, it hangs during setup on the laptop. Just wondered if you found a solution - or whether it just decided to instal for you after a while.

regards,
Simon
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Old 29th April 2009, 04:13 AM   #16
mcmahon48 is offline mcmahon48  United States
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Default I was able to get mine up and running

one of the other members point me to a site with an updated version
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Old 30th April 2009, 02:43 AM   #17
gapmedia is offline gapmedia  Australia
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Thanks mcmahon48,

I seem to be having trouble with versions 1.06 (last version) and 1.0. Guess it must be a 'compatability' problem with the laptop.

Will keep trying though.

Thanks again for your reply.

Simon
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Old 30th April 2009, 02:01 PM   #18
gapmedia is offline gapmedia  Australia
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Problem solved.

Booted up laptop/windows XP in safe mode and Speaker Workshop installed okay.

Simon
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