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Multi-Way Conventional loudspeakers with crossovers

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Old 30th October 2012, 10:30 PM   #631
Pano is offline Pano  United States
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Here it is, Altec Technical Letter #237
http://alteclansingunofficial.nlenet...ers/TL_237.pdf
Note what is said in the second paragraph
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Old 30th October 2012, 10:36 PM   #632
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Originally Posted by Charles Darwin View Post
Watching movies is fine but the ads in the breaks are very heavily compressed so that the rms level is much higher than the movie soundtrack
Now (or soon) against the law to do that in Canada.

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Old 30th October 2012, 10:46 PM   #633
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When I watched Eureka sci-fi soup opera I had to lower down sometimes -3 db from season to season. They were obviously changing compression ratio.
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Old 30th October 2012, 11:19 PM   #634
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Thanks Pano!

Great informations, i think i understand difference between dispersion pattern and off axis response now.
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Old 30th October 2012, 11:45 PM   #635
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Now (or soon) against the law to do that in Canada.

dave
CRTC tells broadcasting industry to turn down the volume on loud television commercials
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Old 31st October 2012, 02:48 AM   #636
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Default ANALOG ACTIVE CROSSOVER UPDATE

I tried designing active crossovers with LTSpice this weekend, by simulating the circuit together with the potential amplifier circuits. While I can achieve good performance in AC analysis, FFT was horrible.

We usually work very hard to get a good performing amplifier. Now with the active crossover front end, the task is even harder!

Using analog active crossover is like running a good speaker with bad amplifier
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Old 31st October 2012, 03:01 AM   #637
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^^ Show the results as well as the schematics you used. Also indicate what you thought about them was 'horrible'.
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Old 31st October 2012, 03:52 AM   #638
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Pano ... that paper is pretty handy info. Thanks for posting it.
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Old 31st October 2012, 06:09 AM   #639
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^^ Show the results as well as the schematics you used. Also indicate what you thought about them was 'horrible'.
"Horrible" means the low THD.

I tried 2 types of crossovers (Actually 3 but I quickly gave up using gyrator due to phase issues). Discrete and opamp based. For discrete I made a circuit based on Kaneda, but of course I used my own JFETs and BJTs. For opamp based I used 4 opamps per driver: 3 for Bainter Notch filter and 1 for LP/HP (It is perfect for outdoor system where THD is not critical).

For LP I aimed to use OPA111, for HP I used faster opamps where the faster the opamps the better the performance.

It is no secret. Just build an amplifier with opamp input and you will find in either simulation, measurement or listening test that the performance is a function of the opamp quality, and in my experience is far from top quality. And here we have to deal with more than one opamps...
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Old 31st October 2012, 06:28 AM   #640
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"Horrible" means the low THD.
Low distortion is bad? Bizarre.
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