Jsaint Posted February 24, 2012 Share Posted February 24, 2012 I have a H II stock crossover on a square cup (circuit board type) have not dissembled yet. The plan is to use a single 100w mono L-pad to adjust mid and hi together. Any one done this before? I need to do this cheaply. Needless to say bypass existing board traces. Quote Link to comment Share on other sites More sharing options...
djk Posted February 24, 2012 Share Posted February 24, 2012 No, the impedance is no where near flat. Two L-pads would work, 8 on the tweeter, 16Ω on the mid. Quote Link to comment Share on other sites More sharing options...
John Warren Posted February 24, 2012 Share Posted February 24, 2012 No, the impedance is no where near flat. Two L-pads would work, 8 on the tweeter, 16Ω on the mid. But he says he has to do it "cheaply" and your telling him to do it "intelligently". Will you ever learn? Quote Link to comment Share on other sites More sharing options...
T.H.E. Droid Posted February 24, 2012 Share Posted February 24, 2012 The pad connects into the speaker wires themselves, so you don't have to get into the circuit board. However, with one tweeter and one midrange, you'll need two L-pads as was already mentioned. If you only want to use one L pad, consider using a resitor network instead to adjust the tweeter output. L pads are pretty cheap. They do have ganged L pads , but I didn't see any with an 8 ohm and 16 ohm. Depending on how they are built, you might be able to get ganged 8 ohm and ganged 16 ohm units and reassemble them into ganged 8/16 ohm units. Parts Express: http://www.parts-express.com/wizards/searchResults.cfm?srchExt=CAT&srchCat=196 Quote Link to comment Share on other sites More sharing options...
Jsaint Posted February 24, 2012 Author Share Posted February 24, 2012 Gentlemen you never fail to please, I just cut a couple traces and kinda figured out one L-pad was not the solution. I was at a loss till I saw 16ohms, that is what I needed to know. So far. I will post a picture here in minutes of my cut traces. Ignore the jumpers now that we know a second pad is needed. Quote Link to comment Share on other sites More sharing options...
Jsaint Posted February 24, 2012 Author Share Posted February 24, 2012 OK this is how far I am, I will order a 16ohm pad but seeing I plan to just pad the hi & mid can I use smaller than 100w pads safely? (this was a attempt to combine both horns) Quote Link to comment Share on other sites More sharing options...
Jsaint Posted February 24, 2012 Author Share Posted February 24, 2012 The mess so far. Quote Link to comment Share on other sites More sharing options...
djk Posted February 25, 2012 Share Posted February 25, 2012 Done properly (L-pad between the network and the drivers), a 15W rated L-pad is all that you will need. The autotransformer on the Heresy raises the impedance on the input side to over 70Ω, so you can't use an L-pad there. Buy two of each of these: http://www.parts-express.com/pe/showdetl.cfm?Partnumber=260-274 http://www.parts-express.com/pe/showdetl.cfm?Partnumber=260-248 http://www.parts-express.com/pe/showdetl.cfm?Partnumber=260-254 Quote Link to comment Share on other sites More sharing options...
Jsaint Posted February 25, 2012 Author Share Posted February 25, 2012 Done properly (L-pad between the network and the drivers), a 15W rated L-pad is all that you will need. The autotransformer on the Heresy raises the impedance on the input side to over 70O, so you can't use an L-pad there. Buy two of each of these: http://www.parts-express.com/pe/showdetl.cfm?Partnumber=260-274 http://www.parts-express.com/pe/showdetl.cfm?Partnumber=260-248 http://www.parts-express.com/pe/showdetl.cfm?Partnumber=260-254 OK so, L-pads on the output leads, Hi 8ohm 15w / Mid 16ohm 50w, fix my trace cuts, pads are generous enough due to existing filtering. Thank you for advice. Jason Quote Link to comment Share on other sites More sharing options...
djk Posted February 26, 2012 Share Posted February 26, 2012 "Will you ever learn?" Probably not. I have that problem at work too. The 'production specialists' want the stuff shipped on time, I want it to work properly before it's shipped. I'm trapped in the Dilbert comic strip !!! 1 Quote Link to comment Share on other sites More sharing options...
Jsaint Posted February 26, 2012 Author Share Posted February 26, 2012 This forum needs a "Like" button. Quote Link to comment Share on other sites More sharing options...
Guest " " Posted February 26, 2012 Share Posted February 26, 2012 AL sells these which in one of his replies he indicated were transformers and not autoformers. Quote Link to comment Share on other sites More sharing options...
Guest " " Posted February 26, 2012 Share Posted February 26, 2012 These work pretty good too. Quote Link to comment Share on other sites More sharing options...
John Warren Posted February 26, 2012 Share Posted February 26, 2012 There is an alternative. The autoformer used in the net can be removed altogther and the 1.5uF place in parallel with a 22uF(?). The addition of L-pad will then provide attenuation from 0dB to the limit of the pad. By placing the pad between the autoformer and the driver, as is currently being proposed, the system is attenuated at -10db with the pad set at 0dB. This is acceptable if the goal is to reduce further the attenuation currently provided by the autoformer, Should the desire of the "enthusiast" be to increase the output, say to -8dB, then removal of the autoformer is the option and the destruction of the net and PWK's vision complete! (some tweaks to the net design are here: http://www.northreadingeng.com/Forums/index.php/topic,18.0.html ) Quote Link to comment Share on other sites More sharing options...
John Warren Posted February 26, 2012 Share Posted February 26, 2012 These also work but they will not fit on the pc board. Quote Link to comment Share on other sites More sharing options...
Groomlakearea51 Posted February 26, 2012 Share Posted February 26, 2012 The mess so far. Looks pretty normal to me!!! LOL!!! Quote Link to comment Share on other sites More sharing options...
Jsaint Posted February 26, 2012 Author Share Posted February 26, 2012 Out of the box moment. What about just building a bass crossover sharing the same input and padding the H2 crossover at input ignoring the existing low section. how hard should that be? Kind of a bi-wire setup. Quote Link to comment Share on other sites More sharing options...
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