Infinity crossover coil value
in [Repair]
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From: Bob Urz on 28 Jan 2007 11:33 TimPerry wrote: > TimPerry wrote: > >>>Why is it that all anybody wants to discuss is ring tests rather than >>>suitable coil replacement values? >>> >>>When i get some time, i'll have to find the equations and try to >>>solve for the inductor value and get the closest standard value. >>>That's what this thread was all about. >>> >>> >>> >>> >>> >>>Bob >> >>bob, are you sure the schematic you drew at the first post is >>correct? i ask because i have found that tweeters usully have a >>series capacitor rather then an inductor. > > > nevermind... i see it now. > > >>can you load the remaining portion of the crossover in such a way as >>to determine the crossover frequency by sweeping with a signal >>generator? > > > how come those bozos could give you the thiele small peramiters but not > include a simple schematic? > > Who knows? The caps are listed with values (on the crossover). But the coils are not. I would like to know how there advertising claims in the PDF match Bob the circuit topology of the circuit i found on the crossover. ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =----
From: TimPerry on 28 Jan 2007 23:12 >> >> how come those bozos could give you the thiele small peramiters but >> not include a simple schematic? >> >> > Who knows? The caps are listed with values (on the crossover). But the > coils are not. I would like to know how there advertising claims in > the > PDF match > > Bob > the circuit topology of the circuit i found on the crossover. well output would be low if L has become R.. but i'll bet ya the tweeters are fried or half fried too. i know it will affect the x-over somewhat but i would consider adding a small series resistor once the coil value has been determined. just to reduce the possibility of a callback.... or maybe a diac (back to back zeners) across it.
From: Bob Urz on 29 Jan 2007 01:43 TimPerry wrote: >>>how come those bozos could give you the thiele small peramiters but >>>not include a simple schematic? >>> >>> >> >>Who knows? The caps are listed with values (on the crossover). But the >>coils are not. I would like to know how there advertising claims in >>the >>PDF match >> >>Bob >>the circuit topology of the circuit i found on the crossover. > > > well output would be low if L has become R.. but i'll bet ya the tweeters > are fried or half fried too. > > > i know it will affect the x-over somewhat but i would consider adding a > small series resistor once the coil value has been determined. just to > reduce the possibility of a callback.... or maybe a diac (back to back > zeners) across it. > > > Actually, it has a network that puts 1 to 4 ohms in series with the tweeter to reduce the level. I just left that out of the diagram. Bob ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =----
From: Peter Larsen on 29 Jan 2007 07:00 Bob Urz wrote: > I would like to know how there advertising claims in the > PDF match Their claim holds for the first octave downwards as far as the tweeter is concerned, the usual expectation is that a cross-over spec holds water until 20 dB down and they clearly specify it to be about acoustic output. You give the impression of having understood the x-over spec to be about the output voltage from of the x-over rather than about acheived acoustic output? The pdf you linked to does contain a graph of x-over output voltage as well as driver output spl, so yes, you do not know the exact value of the coil, but you do have a target curve to compare to. As it probably is a stereo system you also have a non-defunct x-over, unless I missed you somewhere saying that both sides were damaged. > Bob Regards Peter Larsen
From: TimPerry on 29 Jan 2007 21:20
>> i know it will affect the x-over somewhat but i would consider >> adding a small series resistor once the coil value has been >> determined. just to reduce the possibility of a callback.... or >> maybe a diac (back to back zeners) across it. >> >> >> > Actually, it has a network that puts 1 to 4 ohms in series with the > tweeter to reduce the level. I just left that out of the diagram. > > Bob i meant one in series with the fried coil. the car owner will surely crank up the tunes to try to autodestruct it the very first thing. |