overlapping crossovers
02-03-2010, 03:30 AM
#1
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overlapping crossovers
my basic question is what happens when you overlap two different crossovers?
i've got a jvc deck and am using the sub out to send a signal to my rockford sub amp. the x/o points on the deck are 116, 80 and 50 Hz. i'm finding the 8o is a bit high and the 50 is too low, i'd prefer something around 60. the rockford amp has an adjustable x/o, so i can pick the point i want. the problem is that the jvc deck cannot turn off the x/o, so i have to use one of the points it offers. i've thought about just using the rear pre-outs to go to the rockford amp but i really like being able to adjust the output level of the sub from the deck.
i've heard that overlapping different x/o points can cause pahsing issues and affect the slope of the x/o as well. any thoughts on this issue? i would probably choose the 80hz point on the deck and then set the sub to somewhere around 60.
i've got a jvc deck and am using the sub out to send a signal to my rockford sub amp. the x/o points on the deck are 116, 80 and 50 Hz. i'm finding the 8o is a bit high and the 50 is too low, i'd prefer something around 60. the rockford amp has an adjustable x/o, so i can pick the point i want. the problem is that the jvc deck cannot turn off the x/o, so i have to use one of the points it offers. i've thought about just using the rear pre-outs to go to the rockford amp but i really like being able to adjust the output level of the sub from the deck.
i've heard that overlapping different x/o points can cause pahsing issues and affect the slope of the x/o as well. any thoughts on this issue? i would probably choose the 80hz point on the deck and then set the sub to somewhere around 60.
02-03-2010, 08:49 AM
#4
^^do what Zoomer said and it will work well. I ran the curves on WinISD to get an idea of the final curve, and assuming that the deck and amp both have 12 dB/oct crossovers (common), the the combination results in approximately a 3rd order (18dB/oct) slope with normal phase and group delay responses.
02-03-2010, 11:56 AM
#5
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^^do what Zoomer said and it will work well. I ran the curves on WinISD to get an idea of the final curve, and assuming that the deck and amp both have 12 dB/oct crossovers (common), the the combination results in approximately a 3rd order (18dB/oct) slope with normal phase and group delay responses.
awesome, thanks guys. i was poking around on the net just before i made the post to see if i could find a program that would show me the curves i was looking for but didn't have any luck.
cheers
02-04-2010, 01:14 AM
#6
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well i tried it out, deck set at 116 and amp at around 70 - something just didn't sound right. i played with the point on the sub a bit but it didn't seem to help. anyway, for now i'm just gonna use the 80hz point on the deck and not use the x/o on the amp at all. it's pretty close to what i want anyway.
02-04-2010, 08:01 PM
#7
^^do what Zoomer said and it will work well. I ran the curves on WinISD to get an idea of the final curve, and assuming that the deck and amp both have 12 dB/oct crossovers (common), the the combination results in approximately a 3rd order (18dB/oct) slope with normal phase and group delay responses.
If you set the amp at 60hz (or where-ever you like it) and the deck at 80hz, you can still use the deck to control the sub level and you will get minimal interference between the 2 units.....
HTH
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