CECAA850 Posted March 28, 2020 Share Posted March 28, 2020 I'm knocking down the mids 3db on my AAs by moving a tap on the tranformer and adding a resistor across the squawker. The transformer is a 3670 and the squawker positive wire is currently on the tap marked 3. I'm assuming I move it to the tap marked 6? The taps on the back of the transformer are marked 3, 6, 9 and 12. TIA Quote Link to comment Share on other sites More sharing options...
glens Posted March 29, 2020 Share Posted March 29, 2020 I'm thinking the numbers are dB reduction levels, so bigger is higher reduction. And that the impedance seen by the crossover will become higher, so a parallel resistor would be correct. But the resistor will also consume signal, dropping the output of the driver yet more. So you'll end up at more than -3 dB output. ("upwards" of -6?) Might be better to leave the tap alone and use a combination of series and parallel resistors after the transformer such that the impedance stays nominally the same. Or use just a series resistor upstream of the crossover, but then you'll have to move the tweeter crossover stuff ahead of that unless you want to maintain the mid-to-high relationship. 1 Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted March 29, 2020 Author Share Posted March 29, 2020 Thanks Glen. Quote Link to comment Share on other sites More sharing options...
Thaddeus Smith Posted March 29, 2020 Share Posted March 29, 2020 Chop the tops and go active. 1 Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted April 1, 2020 Author Share Posted April 1, 2020 On 3/28/2020 at 10:03 PM, Thaddeus Smith said: Chop the tops and go active. My way took 15 minutes a speaker and cost less than 10 dollars. I love the results. Yours? Quote Link to comment Share on other sites More sharing options...
Thaddeus Smith Posted April 1, 2020 Share Posted April 1, 2020 2 minutes ago, CECAA850 said: My way took 15 minutes a speaker and cost less than 10 dollars. I love the results. Yours? I too love the results. So it looks like samesies. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted April 1, 2020 Author Share Posted April 1, 2020 5 minutes ago, Thaddeus Smith said: I too love the results. So it looks like samesies. Unless you consider time and money then yes. Quote Link to comment Share on other sites More sharing options...
Thaddeus Smith Posted April 1, 2020 Share Posted April 1, 2020 6 minutes ago, CECAA850 said: Unless you consider time and money I'm not. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted April 1, 2020 Author Share Posted April 1, 2020 21 minutes ago, Thaddeus Smith said: I'm not. Obviously. Quote Link to comment Share on other sites More sharing options...
Thaddeus Smith Posted April 1, 2020 Share Posted April 1, 2020 6 minutes ago, CECAA850 said: Obviously. It was minimal, but not 15 minutes and 10 American dollars minimal. Quote Link to comment Share on other sites More sharing options...
rockhound Posted April 1, 2020 Share Posted April 1, 2020 It would be useful to those that may want to do the same to see a picture of what the final mod looked like from the original a before and after if you will. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted April 1, 2020 Author Share Posted April 1, 2020 21 minutes ago, rockhound said: It would be useful to those that may want to do the same to see a picture of what the final mod looked like from the original a before and after if you will. Too late. It's back together. The only picture I have of the resistor installed can't be posted as I'm over my limit. Quote Link to comment Share on other sites More sharing options...
billybob Posted April 1, 2020 Share Posted April 1, 2020 Alright then! Make a thumbnail scketch...TIA! Quote Link to comment Share on other sites More sharing options...
Marvel Posted April 1, 2020 Share Posted April 1, 2020 On 3/28/2020 at 8:34 PM, glens said: I'm thinking the numbers are dB reduction levels, so bigger is higher reduction. And that the impedance seen by the crossover will become higher, so a parallel resistor would be correct. But the resistor will also consume signal, dropping the output of the driver yet more. So you'll end up at more than -3 dB output. ("upwards" of -6?) Might be better to leave the tap alone and use a combination of series and parallel resistors after the transformer such that the impedance stays nominally the same. Or use just a series resistor upstream of the crossover, but then you'll have to move the tweeter crossover stuff ahead of that unless you want to maintain the mid-to-high relationship. There are multiple threads on here about how much power a constant impedance network uses. The 'swamping' resistor across the the autoformer will work fine. Where's @Deang when we need him. My DH2 crossovers use this method and you just need to go Bruce Quote Link to comment Share on other sites More sharing options...
mboxler Posted April 1, 2020 Share Posted April 1, 2020 4 minutes ago, CECAA850 said: Too late. It's back together. The only picture I have of the resistor installed can't be posted as I'm over my limit. Did you end up soldering a 15 - 16 ohm resistor across the squawker and move the squawker to taps 0 - 3? Quote Link to comment Share on other sites More sharing options...
DizRotus Posted April 1, 2020 Share Posted April 1, 2020 49 minutes ago, CECAA850 said: The only picture I have of the resistor installed can't be posted as I'm over my limit. How are you adjusting to life among the unwashed? Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted April 1, 2020 Author Share Posted April 1, 2020 55 minutes ago, mboxler said: Did you end up soldering a 15 - 16 ohm resistor across the squawker and move the squawker to taps 0 - 3? Yes, add the resistor across the squawker wiring and drop one tap. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted April 1, 2020 Author Share Posted April 1, 2020 14 minutes ago, DizRotus said: How are you adjusting to life among the unwashed? Business as usual. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted April 1, 2020 Author Share Posted April 1, 2020 59 minutes ago, billybob said: Alright then! Make a thumbnail scketch...TIA! ? 1 Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted April 1, 2020 Author Share Posted April 1, 2020 3 hours ago, mboxler said: Did you end up soldering a 15 - 16 ohm resistor across the squawker and move the squawker to taps 0 - 3? The resistor had long leads so I actually mounted it to the crossover at the terminal strip. Quote Link to comment Share on other sites More sharing options...
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