CECAA850 Posted March 9, 2019 Share Posted March 9, 2019 You can see them here on the back of the cup. They just run the highs and mids parallel. Quote Link to comment Share on other sites More sharing options...
Dave A Posted March 9, 2019 Author Share Posted March 9, 2019 The crossover I have is much more complicated than yours. Quote Link to comment Share on other sites More sharing options...
glens Posted March 9, 2019 Share Posted March 9, 2019 Apart from individual component values that may or may not differ from those in the schematic above, it looks like you've additionally got a 1st-order low-pass (which would phase the squawker signal back 45° for a total of +45° from input) as well as overload protection on the squawker. Can you sketch out a diagram? Quote Link to comment Share on other sites More sharing options...
Dave A Posted March 9, 2019 Author Share Posted March 9, 2019 10 minutes ago, glens said: Apart from individual component values that may or may not differ from those in the schematic above, it looks like you've additionally got a 1st-order low-pass (which would phase the squawker signal back 45° for a total of +45° from input) as well as overload protection on the squawker. Can you sketch out a diagram? Here you go. KP 301.pdf Quote Link to comment Share on other sites More sharing options...
glens Posted March 9, 2019 Share Posted March 9, 2019 Near as I can tell from this angle it looks like a match to the diagram. So it's a 2nd-order low-pass on the squawker. From what I can see it appears as though the order of red / black on the right (long barrier strip) is reversed on the two-position strip. I'd leave it alone so long as everything's routed correctly, unless you wanted to jumper that two-position strip to the long-strip input pair and run only one set of wires in to the crossover, maybe (don't think I would, though). Quote Link to comment Share on other sites More sharing options...
Dave A Posted March 9, 2019 Author Share Posted March 9, 2019 1 minute ago, glens said: Near as I can tell from this angle it looks like a match to the diagram. So it's a 2nd-order low-pass on the squawker. From what I can see it appears as though the order of red / black on the right (long barrier strip) is reversed on the two-position strip. I'd leave it alone so long as everything's routed correctly, unless you wanted to jumper that two-position strip to the long-strip input pair and run only one set of wires in to the crossover, maybe (don't think I would, though). I have left it alone since it does work and sounds good. I was just wondering about the complexity of it all and thinking the more stuff you add in would that possibly degrade the sound? Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted March 9, 2019 Share Posted March 9, 2019 2 hours ago, Dave A said: The crossover I have is much more complicated than yours. Different crossovers. I was just showing the jumper wire. Quote Link to comment Share on other sites More sharing options...
Deang Posted March 10, 2019 Share Posted March 10, 2019 Pretty simple filter really. 12dB/12dB/18dB - more power handling and slightly better imaging at moderate power levels. Quote Link to comment Share on other sites More sharing options...
Dave A Posted March 10, 2019 Author Share Posted March 10, 2019 1 minute ago, Deang said: Pretty simple filter really. 12dB/12dB/18dB - more power handling and slightly better imaging at moderate power levels. They do sound better. Quote Link to comment Share on other sites More sharing options...
glens Posted March 10, 2019 Share Posted March 10, 2019 1 hour ago, Dave A said: I have left it alone since it does work and sounds good. I was just wondering about the complexity of it all and thinking the more stuff you add in would that possibly degrade the sound? For what it's worth I agree with Dean, pretty simple, really. Except maybe for using both a resistor and an autoformer on the mid. 12dB/12dB/18dB is a little ambiguous. I don't know what the convention is but I'd say 12dB/12dB 12dB/18dB. Quote Link to comment Share on other sites More sharing options...
windashine Posted March 10, 2019 Share Posted March 10, 2019 1 hour ago, glens said: Near as I can tell from this angle it looks like... … o O (there's a rotator button right next to the - & + in that pdf glens... on your screen) lol Quote Link to comment Share on other sites More sharing options...
glens Posted March 10, 2019 Share Posted March 10, 2019 Just now, windashine said: … o O (there's a rotator button right next to the - & + in that pdf glens... on your screen) lol Haha! I was referring to his photos 1 Quote Link to comment Share on other sites More sharing options...
Deang Posted March 10, 2019 Share Posted March 10, 2019 Didn’t even notice the .pdf. Looks like a 24dB/octave midrange. The autoformer has too much inductance to actually be doing anything (other than introducing phase shift). The series resistor behind the autoformer is attenuating and manipulating the impedance before it gets to the input tap. The resistor in parallel with the polyswitch is the tweeter protection. These are all uneducated guesses. Quote Link to comment Share on other sites More sharing options...
glens Posted March 10, 2019 Share Posted March 10, 2019 I'm sticking with 12 up and 12 down on the mid looking at that PDF, Dean. Assuming the tap numbers actually mean anything on the auto, coming off at 4 out of 5 ain't going to be much voltage drop. Obviously they had something in mind and they do this for a living, but seems a lower tap would do the same thing as a series resistor with a higher tap (or a different value resistor allowing elimination of the autoformer). That's if there are actually multiple taps available for use on that unit, don't know... The only autoformers I've had much experience with changed pretty-high voltages to mediumly-high voltages for use in manufacturing. Quote Link to comment Share on other sites More sharing options...
Deang Posted March 10, 2019 Share Posted March 10, 2019 Tap 4 is 3dB down. Yeah, I thought it was cap coil cap coil, but it’s not. Could be very much as you say. Hey, I just build this stuff. Interesting. Quote Link to comment Share on other sites More sharing options...
ClaudeJ1 Posted March 12, 2019 Share Posted March 12, 2019 On 3/8/2019 at 11:49 AM, Deang said: It’s a stupid feature that customers want, so the company caves and adds it - because if they don’t, then it’s something the competition has that they don’t. It’s marketing, not engineering. Famous words, uttered to me by PWK himself in 1985. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.