hi all thanks for viewing and helping in advance!
my speaker is 2-way JBL S26 (http://www.jbl.com/resources/Brands...atedDocuments/en-US/TechnicalSheet/S26 ts.pdf), inductor L1 is actuall 2.0mH !!!
so i have thses to put into 2nd oder calculator (Speaker Crossover Calculators by V-Cap) but i didnt come up with similar LC values as specified in the schematic
LF impedance = 4.8 Ohm
HF impedance = 6.7 Ohm (L-padded)
XO frequency = 2000 Hz
Q1: what am i missed or what formula to get the LC values (low freq 2mH 12uF, high freq 200uH 6uF)?
Q2: what to do with inductor DCR or what impact if change L3 with different (lower) DCR?
water
my speaker is 2-way JBL S26 (http://www.jbl.com/resources/Brands...atedDocuments/en-US/TechnicalSheet/S26 ts.pdf), inductor L1 is actuall 2.0mH !!!
so i have thses to put into 2nd oder calculator (Speaker Crossover Calculators by V-Cap) but i didnt come up with similar LC values as specified in the schematic
LF impedance = 4.8 Ohm
HF impedance = 6.7 Ohm (L-padded)
XO frequency = 2000 Hz
Q1: what am i missed or what formula to get the LC values (low freq 2mH 12uF, high freq 200uH 6uF)?
Q2: what to do with inductor DCR or what impact if change L3 with different (lower) DCR?
water
No calculator works in real life. You should use simulations based on real thiele/small parameters and cabinet dimensions as well.
The impedance you have specified is DC resistance. Impedance is more in the area of 6 ohm and 8 ohm (but these a frequency dependendant and not fixed). The bigger inudctor in the LF unit is probably some Baffle step compensation. The value depends on baffle with and placement near wall or far from wall. Normally you would make a 3 dB Baffle step correction if the speaker is used near wall.
The impedance you have specified is DC resistance. Impedance is more in the area of 6 ohm and 8 ohm (but these a frequency dependendant and not fixed). The bigger inudctor in the LF unit is probably some Baffle step compensation. The value depends on baffle with and placement near wall or far from wall. Normally you would make a 3 dB Baffle step correction if the speaker is used near wall.
@kinsei
Original crossover values are real life values and there
since to be nothing wrong with them, except for the L1
marking. Instead of micro should be mH.
Many believe that substituting parts for higher quality types
is justified. That includes inductors with lower dcr. Your call.
If you are looking to improve the sonics, maybe there could
be done something about padding/unpadding the tweeter
output.
Original crossover values are real life values and there
since to be nothing wrong with them, except for the L1
marking. Instead of micro should be mH.
Many believe that substituting parts for higher quality types
is justified. That includes inductors with lower dcr. Your call.
If you are looking to improve the sonics, maybe there could
be done something about padding/unpadding the tweeter
output.
Hi,
The crossover calculator is simply wrong for real speakers.
If L3 is undesized and high resistance a bigger rating lower
resistance inductor will improve matters. Properly sized
with lowish dcr, a lower dcr inductors effect will be minimal.
rgds, sreten.
2mH is a ballpark value for baffle step correction.
The crossover calculator is simply wrong for real speakers.
If L3 is undesized and high resistance a bigger rating lower
resistance inductor will improve matters. Properly sized
with lowish dcr, a lower dcr inductors effect will be minimal.
rgds, sreten.
2mH is a ballpark value for baffle step correction.
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