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Multi-Way Conventional loudspeakers with crossovers

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Old 29th December 2012, 01:28 AM   #11
DavidL is offline DavidL  United States
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Madisound or Meniscus used to sell Eclipse drivers back in the 90's I believe.
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Old 29th December 2012, 02:18 PM   #12
Dissi is offline Dissi  Switzerland
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Quote:
Originally Posted by cbb View Post
I have estimated the db's on the tweeter needed to be about 2-3 db up. Does that translate/can it be calulated somewhere to be a change from the 5 ohm resistor value? Such as 1 ohm lower = x db's or are there too many variables?
No, not too many variables, expect:

5 ohm = 0 dB
4 ohm = + 1.5 dB
3 ohm = + 3 dB
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Old 29th December 2012, 03:48 PM   #13
cbb is offline cbb
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Originally Posted by mjf View Post
hello.
the 3ohm/5ohm res-combo is a voltage divider.......is like a fixed volume control for the tweeter.
i played around with the simulator.
if you change 5ohm to 4,7ohm and 3ohm to 3,9ohm you should get +1,5db more treble (this shifts the entire frequency response of the tweeter upwards....)
Ok, now I am not sure. If it is as simple as lowering the 5 ohm resistor then should I fool with the 3 ohm unit? I played some music using Windows Media Player and my wife and I agree that 1 db is not enough but 2 db is too much so +1.5 it is. I used the graphic EQ in MP raising the 4khz, 8 khz and the 16khz all up 1 or 2 db together and also moving back to flat. The best tool I have to rough it in. I would like to get this right as I am going to buy Mills resistors. Might recap, same value, with quality while I am in there.

I am such a novice, is this a 12db 2nd order crossover? Is the crossover about 3khz?

You guys are great!!
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Old 29th December 2012, 10:32 PM   #14
mjf is offline mjf  Austria
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....yes, try it out, to find the best solution.......

those "cement wire wound resistors" have some inductance, i use mox(metal oxide)res or so for the tweeter crossover.

the woofer has only one coil in the signal path.....first order,around 6db.
the tweeter has two (frequency dependent) parts in the path......second order, but not 12db (should be 7uF + 0,9mH),it has a steeper slope.
not a textbook application ,may call it a mixed crossover,a special design for this two drivers.
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Old 30th December 2012, 02:20 AM   #15
cbb is offline cbb
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Quote:
Originally Posted by mjf View Post
....yes, try it out, to find the best solution.......

those "cement wire wound resistors" have some inductance, i use mox(metal oxide)res or so for the tweeter crossover.

the woofer has only one coil in the signal path.....first order,around 6db.
the tweeter has two (frequency dependent) parts in the path......second order, but not 12db (should be 7uF + 0,9mH),it has a steeper slope.
not a textbook application ,may call it a mixed crossover,a special design for this two drivers.
And inductance in the resistors does what to the sound?

The part about, should be 7uF + .9mH, do I need to shoot for right on 7 for the cap, I see 6.8uF are common too far off?, and the coil needs to be replaced with a .9 unit? Is the crossover off a bit?
Or are you saying that the 2 drivers were blended the best they can be. Sorry, this is a bit over my head but I am trying.

Last edited by cbb; 30th December 2012 at 02:24 AM.
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Old 30th December 2012, 04:08 AM   #16
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Those "Cement wire wound resistors" are usually wound in an inductance-cancelling pattern. Put one on an LCR meter and see.
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Old 30th December 2012, 10:44 AM   #17
mjf is offline mjf  Austria
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And inductance in the resistors does what to the sound?

.......don't worry about this,it was only a hint that i personally prefer different parts in my tweeter crossovers.
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Old 30th December 2012, 11:02 AM   #18
mjf is offline mjf  Austria
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Or are you saying that the 2 drivers were blended the best they can be.

......i guess it is........

( 7uf/0,9mh was only an example for a standard crossover......textbook......butterworth......how this works;
if you like the sound do not change the value of these parts.)
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Old 30th December 2012, 02:40 PM   #19
cbb is offline cbb
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Ok, I understand. I just wanted to be sure there were no errors before I upgraded the parts. I do not 'hear' the crossover as there seems to be good driver integration.

I was going to try the Clarity Cap PX caps but with the odd 7.2 value I would need 2 in parallel and that seems a bit pricy. Any suggestions for other quality units?

I tried to draw up the schematic, is it correct? Thank you!
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Old 30th December 2012, 03:27 PM   #20
mjf is offline mjf  Austria
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....3ohm res in wrong position i think.

often i use mkp (polypropylen) caps in my crossovers.......nothing special.

yes,if you have odd values you can paralell caps.......like 6,8uf + 0,33uf or 6,8uf + 0,47uf and so on........
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