Hi Steve,
it's a refurbishing with coils value simulated.... nore the filter or the drivers were measured yet.
As it is a second hand, perhaps the previous owner inverted the two cellules of the 24db treble filter ? You're feeling ?
it's a refurbishing with coils value simulated.... nore the filter or the drivers were measured yet.
As it is a second hand, perhaps the previous owner inverted the two cellules of the 24db treble filter ? You're feeling ?
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I am glad you are not the designer of this:
Looks like a fire hazard to me... burn your house down! 😱
You need a multi meter with an inductance scale.
Problem with getting the taper wrong on a 4th order is it mucks up the impedance.
The late Jeff Bagby gives some useful ideas here:
I take a bit of license with those, but they work well enough.
Looks like a fire hazard to me... burn your house down! 😱
You need a multi meter with an inductance scale.
Problem with getting the taper wrong on a 4th order is it mucks up the impedance.
The late Jeff Bagby gives some useful ideas here:
I take a bit of license with those, but they work well enough.
thanks for that.
Yes, I really have to find the last resistor part to finish my Arta Box to be able to measure the coils and the impedance curves of the raw drivers.
on voice coil I could measure the driver : 5.6 ohms for the two woofers wirered in serie or parallel, I don't know, it can not be seen. The Bessel second order seems to be ok at 125 hz with a 3db slope it gives the 103 uF of the low pass bass filter.
The medium voice coil with the multimer gives a 3.6 ohms, assuming it's what the impedance shows at 125 hz, we have the 260 uF of the caps marking. At listening test I am more happy with 268/269 uF which means the impedance curve at cut-off would be more 3.5 ohms for 125 hz ! Former caps measured at 280 uF i.e an impedance curve at 125 hz cut-off of around 3.35 ohms. 280 uf gives a too damped damped shy bass in my room.
I was not able to measure the tweeter voice coil, but it is said to be 6 ohms !
Next step indeed, now you guys have explained to me about the polarity, is indeed to measure the drivers and raw voice coils to understand more about this filter and what did the former owner.
Many thanks to all 🙂
Yes, I really have to find the last resistor part to finish my Arta Box to be able to measure the coils and the impedance curves of the raw drivers.
on voice coil I could measure the driver : 5.6 ohms for the two woofers wirered in serie or parallel, I don't know, it can not be seen. The Bessel second order seems to be ok at 125 hz with a 3db slope it gives the 103 uF of the low pass bass filter.
The medium voice coil with the multimer gives a 3.6 ohms, assuming it's what the impedance shows at 125 hz, we have the 260 uF of the caps marking. At listening test I am more happy with 268/269 uF which means the impedance curve at cut-off would be more 3.5 ohms for 125 hz ! Former caps measured at 280 uF i.e an impedance curve at 125 hz cut-off of around 3.35 ohms. 280 uf gives a too damped damped shy bass in my room.
I was not able to measure the tweeter voice coil, but it is said to be 6 ohms !
Next step indeed, now you guys have explained to me about the polarity, is indeed to measure the drivers and raw voice coils to understand more about this filter and what did the former owner.
Many thanks to all 🙂
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