Is there anything bad about an 18dB crossover slope? What about a 6 or 12dB slope?
Also, what are some ballpark figures for cutoff points for:
Bass(subs)
Midbass(6 1/2's or 6x9's)
Midrange(also 6 1/2's)
Treble(tweeters)
Replies (3)
uochronos on 02/15/2005 16:38:44
ok every system is going to have differnt cut off points... i used to run 10" subs to 100hz... my current 12" sub i only run to 70hz... some midraneg/midbass play well all the way till 60 some are more cut off at 100hz... really there are no balpark figures for where you should crossover everysytem well be a tad differnt.
as for the slope... let me explain how it works basicaly... 1 octave is 10hz 10,20,30,40,etc so if your slope is 12db per octave... then the signal is cut by 12 deciabals per octave... a 24db per octave would cut 24db per octave... for things like SS filters a 24db per octave would be your best possible choice... for crossover points i prefer a 18db the sound doesnt drop off quite as drastic... many people are quite happy with 12db peroctave xovers... its really all in what you want and need.
Chronos
audeogod on 02/15/2005 17:13:18
I thought octaves doubled in frequency each time. Like 10, 20, 40, 80, 160, for example.
I was just wondering cause I heard that 18dB slopes were harder to use cause they might create a "hole" in the music if the drivers were not set close enough in terms of crossover points. You'd lose a few frequencies they said. Some speakers I was looking at have 18dB crossovers. Phoenix Gold that is.
As for the individual points, I just wanted to know cause it would be a starting point and I could adjust from there to suite my tastes.
cplkittle on 02/15/2005 17:51:32
octaves are a doubling of frequency.
There is nothing bad about an 18dB/octave slope. In the case of subsonic filtering, I prefer a steeper slope since there is no way to really make a speaker perform loudly in any type of enclosure below 25Hz. unless it is the size of a bus. As far as holes or overlapping or cancellation, all crossover points should be set by ear unless you only have the sound system for competition. I personally think the cancellation issue is overrated. If you have no crossover, and you have the basic 4 midrange drivers and 2 subs for example, is everything cancelled out? No.
Crossovers do make for a very nice clean balancing of sound, but again, it is all a matter of preference.
Also, what are some ballpark figures for cutoff points for:
Bass(subs)
Midbass(6 1/2's or 6x9's)
Midrange(also 6 1/2's)
Treble(tweeters)
Replies (3)
uochronos on 02/15/2005 16:38:44
ok every system is going to have differnt cut off points... i used to run 10" subs to 100hz... my current 12" sub i only run to 70hz... some midraneg/midbass play well all the way till 60 some are more cut off at 100hz... really there are no balpark figures for where you should crossover everysytem well be a tad differnt.
as for the slope... let me explain how it works basicaly... 1 octave is 10hz 10,20,30,40,etc so if your slope is 12db per octave... then the signal is cut by 12 deciabals per octave... a 24db per octave would cut 24db per octave... for things like SS filters a 24db per octave would be your best possible choice... for crossover points i prefer a 18db the sound doesnt drop off quite as drastic... many people are quite happy with 12db peroctave xovers... its really all in what you want and need.
Chronos
audeogod on 02/15/2005 17:13:18
I thought octaves doubled in frequency each time. Like 10, 20, 40, 80, 160, for example.
I was just wondering cause I heard that 18dB slopes were harder to use cause they might create a "hole" in the music if the drivers were not set close enough in terms of crossover points. You'd lose a few frequencies they said. Some speakers I was looking at have 18dB crossovers. Phoenix Gold that is.
As for the individual points, I just wanted to know cause it would be a starting point and I could adjust from there to suite my tastes.
cplkittle on 02/15/2005 17:51:32
octaves are a doubling of frequency.
There is nothing bad about an 18dB/octave slope. In the case of subsonic filtering, I prefer a steeper slope since there is no way to really make a speaker perform loudly in any type of enclosure below 25Hz. unless it is the size of a bus. As far as holes or overlapping or cancellation, all crossover points should be set by ear unless you only have the sound system for competition. I personally think the cancellation issue is overrated. If you have no crossover, and you have the basic 4 midrange drivers and 2 subs for example, is everything cancelled out? No.
Crossovers do make for a very nice clean balancing of sound, but again, it is all a matter of preference.
Copyright ClubKnowledge 2009 * All Rights Reserved
