user44455555
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- Jan 16, 2021
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Hi
Here i write the step response time the system need from 20% to 100% and back to 20% Level that can see in the measure pictures. to simulate crossover filters of speakers for the bass/mid I use the LP before the headphone and measure headphone at distance 1.5 cm and speaker at distance 1.5 cm. speakers have much larger time between the arrows. the jbl 104 is a coax system so i can not only measure the woofer/mid. but you see when the mid range step begin.
280 µsec the 1.5 khz -6 db Lowpass before headphone(headphone have much more Low bass as the Kali)
366 µsec the 1.5 khz -12 db Lowpass before headphone
303 µsec the 2 khz -12 db Lowpass before headphone
1448 µsec Kali LP6
900 µsec the JBL with EQ that boost bass by 12 db have more bass as Kali and some other frequency bands around 3-6 db for FR correction
800 µsec the JBL without EQ have lower bass as the Kali
you see the step response of the Kali is 1448/366 = 390% slower as the Headphone with LP Filter.
when want compare the diffrence between much EQ on the JBL(have 12 db bassboost on EQ) and no EQ it is 900/800= 12% . diffrent FR settings have very few influence show this compare of FR
and the diffrence from the LP filter from 1.5 khz 6 db to LP 2 khz 12 db is only 86 µsec
but it is clear which LP is use. when measure the woofer at distance 1.5 cm then can see the FR fit to a 12 db crossover LP filter in the Kali LP6
So what do you think cause this large diffrence of 390% ?. I try with Eq i never get much longer step response as 300 µsec
Here i write the step response time the system need from 20% to 100% and back to 20% Level that can see in the measure pictures. to simulate crossover filters of speakers for the bass/mid I use the LP before the headphone and measure headphone at distance 1.5 cm and speaker at distance 1.5 cm. speakers have much larger time between the arrows. the jbl 104 is a coax system so i can not only measure the woofer/mid. but you see when the mid range step begin.
280 µsec the 1.5 khz -6 db Lowpass before headphone(headphone have much more Low bass as the Kali)
366 µsec the 1.5 khz -12 db Lowpass before headphone
303 µsec the 2 khz -12 db Lowpass before headphone
1448 µsec Kali LP6
900 µsec the JBL with EQ that boost bass by 12 db have more bass as Kali and some other frequency bands around 3-6 db for FR correction
800 µsec the JBL without EQ have lower bass as the Kali
you see the step response of the Kali is 1448/366 = 390% slower as the Headphone with LP Filter.
when want compare the diffrence between much EQ on the JBL(have 12 db bassboost on EQ) and no EQ it is 900/800= 12% . diffrent FR settings have very few influence show this compare of FR
and the diffrence from the LP filter from 1.5 khz 6 db to LP 2 khz 12 db is only 86 µsec
but it is clear which LP is use. when measure the woofer at distance 1.5 cm then can see the FR fit to a 12 db crossover LP filter in the Kali LP6
So what do you think cause this large diffrence of 390% ?. I try with Eq i never get much longer step response as 300 µsec
