Eminence APT-50 super tweeter [message #50695] |
Tue, 13 February 2007 19:39 ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
Ken.R
Messages: 8 Registered: May 2009
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Esquire |
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Hi Wayne, awhile back you told me how to add the JBL 077 slot tweeters to my Seven 18's that you designed for me. These are your Sevens that are on Martinellis site. The drivers used are the 2245h, 2123h, 2426h. I added the 077's with the cap and the resister like you told me to with great results. At this time I use the JBL LE85 in place of the 2426h with good results also. I just purchased a pair of custum mini smith wood horns that are hooked up with the Eminence APT-50 super tweeters. Could you please tell me what capaciter and resister I need to use to run this from my Le85 tweeters. APT-50 SUPER TWEETER SPECS 8 OHM Power rating 45 WRMS @ 3.5 KHZ 18 DB/OCTIVE 85 WRMS @5.0 KHZ USABLE FREQ RANGE 3.5 HZ-20 KHZ RECOMEND CROSS 3.5 KHZ SENSITIVITY (1 W @ 1 M MOUNTED TO TEST HORN 105 db Thanks KEN
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Passive crossover breadboarding [message #50711 is a reply to message #50710] |
Sat, 17 February 2007 11:51 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
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Wayne Parham
Messages: 18758 Registered: January 2001
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Illuminati (33rd Degree) |
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Looks like an interesting way to switch passive components around to make different crossover configurations, similar to breadboarding. What components are in this box and how many configurations does it support? Does it use patch cords for connection or switching? It looks like yours uses switches. If so, are the configrations fixed, (say, second order) and the switches control what passive components are used? Can you switch in different values of dampers, with diferent fixed resisitance values and different capacitor and what not?I like your test box. It looks like a handy way to swap values. I might suggest using a large breadboard with various size inductors, capacitors and resistors with bannana plugs on each one. With a whole bunch of patch cords, you can build up any crossover configuration you want. Some would say "go active" and there is merit in that. But if you want to include a passive crossover, you have to design it with the characteristics of the drivers in mind. The reactance, resistance and non-linear properties of the driver interact with the crossover components, so the driver is an integral part of the crossover filter function. This can be simulated with Spice, or you can do it this way, with a physical model and measure the response.
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