Hello,
I would please like to know if there would be a difference with two caps arengement for the high pass of a woofer-medium unit which XO is in the 100 hz/200 hz where there is a lot of energy and snap behavior in the music.
If the high pass of the woofer-mid is made of 250 uF and basic MKP caps are choosed, is there a noticeable sounding difference between these two arrengement please :
- 2 caps // : 200 + 50 uF
- 5 caps // : 50 + 50 + 50 + 50 + 50 uF
Theorically second is best because the divided inductance and better esr, but will it be hearable enough in real life, given the caps are MKP (CrossCaps from Jantzen in mind) ? Second solution is more bulky and expensive !
Should I also increase a little the serie resistors value if a former smooth foil lytic is swapped for the MKPs or the Z diference will be low enough not to be noticed during the playback ?
Many thanks.
Edit : I also assume less Z in serie is giving a lowered impedance of the driver, so a different crossover frequency number ? Or is just the spl that is changing and the driver impedance curve is not moving whatever the Z in serie before the voice coil ?
I would please like to know if there would be a difference with two caps arengement for the high pass of a woofer-medium unit which XO is in the 100 hz/200 hz where there is a lot of energy and snap behavior in the music.
If the high pass of the woofer-mid is made of 250 uF and basic MKP caps are choosed, is there a noticeable sounding difference between these two arrengement please :
- 2 caps // : 200 + 50 uF
- 5 caps // : 50 + 50 + 50 + 50 + 50 uF
Theorically second is best because the divided inductance and better esr, but will it be hearable enough in real life, given the caps are MKP (CrossCaps from Jantzen in mind) ? Second solution is more bulky and expensive !
Should I also increase a little the serie resistors value if a former smooth foil lytic is swapped for the MKPs or the Z diference will be low enough not to be noticed during the playback ?
Many thanks.
Edit : I also assume less Z in serie is giving a lowered impedance of the driver, so a different crossover frequency number ? Or is just the spl that is changing and the driver impedance curve is not moving whatever the Z in serie before the voice coil ?
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I have not the caps yet. They are Jantzen Cross-Cap serie
ESR is 0.00005 and insulation resitance at 1 k is 104 M Ohms for these capacitance values.
The fact is I never see such a huge value with standalone caps but instead the value divided in several caps as in the scenario. E.g. Troels Gravsen.
I'm asking if there is a reason as he also use often resistors and there is the serie resistance of the voice coil in the medium network? I can at least understand with lytics, even the modernest smooth foils but for MKPs why should it matter ? I thought about less inductance perhaps ?
ESR is 0.00005 and insulation resitance at 1 k is 104 M Ohms for these capacitance values.
The fact is I never see such a huge value with standalone caps but instead the value divided in several caps as in the scenario. E.g. Troels Gravsen.
I'm asking if there is a reason as he also use often resistors and there is the serie resistance of the voice coil in the medium network? I can at least understand with lytics, even the modernest smooth foils but for MKPs why should it matter ? I thought about less inductance perhaps ?
AllenB, I believe you got it !
Indeed, I have been checking at Jantzen and when T. Gravsen uses a caps bank for a big capacitance need, the limitation comes from the maximum uF avaliable in the Jantzen Superior range : 22 uF max. And the Standard blue line : 100 uF max. Finally the Cross-Caps line : 330 uF max. He doesn't use this last.
Assuming it's a new filter design, so inside a same MKP capacitor family, but the area management on the pcb, there is no special reason to divide a big value from a standalone capacitor into several smaller... ;few noticeable difference enough with MKP on the ESR vs eventually the tue resistors in serie to match the spl level. And anyway the impedance curve between two choices will not be affected. Is it correct ?
I naivly believed a mid Xoed very low in this 100/200 hz area could be more snappy, punch acurate with a mkp bank for the serie cap than a big standalone one !
Thank you AllenB, you answered to my trade off problem
. I assume also for the ones who choose film caps that low and don't want NPE because of agging behavior, MKT will do as well as "low" quality MKP : Solen, Cross-Cap, generic MKPs....
Indeed, I have been checking at Jantzen and when T. Gravsen uses a caps bank for a big capacitance need, the limitation comes from the maximum uF avaliable in the Jantzen Superior range : 22 uF max. And the Standard blue line : 100 uF max. Finally the Cross-Caps line : 330 uF max. He doesn't use this last.
Assuming it's a new filter design, so inside a same MKP capacitor family, but the area management on the pcb, there is no special reason to divide a big value from a standalone capacitor into several smaller... ;few noticeable difference enough with MKP on the ESR vs eventually the tue resistors in serie to match the spl level. And anyway the impedance curve between two choices will not be affected. Is it correct ?
I naivly believed a mid Xoed very low in this 100/200 hz area could be more snappy, punch acurate with a mkp bank for the serie cap than a big standalone one !
Thank you AllenB, you answered to my trade off problem
. I assume also for the ones who choose film caps that low and don't want NPE because of agging behavior, MKT will do as well as "low" quality MKP : Solen, Cross-Cap, generic MKPs....
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