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800-5 kHz Band Pass 8 Ohm Crossover
Hooking this up in conjunction with another passive crossover?
I have a 2-way passive setup that I would like to convert to a 3-way passive setup using this bandpass crossover. My 2-way is 4ohm (drivers and crossover) and have a 4 channel amp. I would like 2 channels to drive this crossover to a Dayton 8ohm dome mid and my HP 4ohm crossover at 5k+ to the SAME amp channel. Is this possible? Or by having this bandpass crossover and a 4ohm HP crossover screw things up on the same amp channels? The other 2 amp channels would go to some woofers below 500hz crossed over actively. So, in sum, I'm trying to run 4 amp channels to do a 3-way setup with a mix of 4ohm and the mids at 8ohm with this crossover. Must I do 6 channels of amp to do what i want to do?
The primary issue, as far as the amp is concerned is impedence. This is a 1st order bandpass filter.A standard paralell crossover is equivalent, if not identical, to multiple LP, BP and HP filters. As long as the total impedance at all frequencies is acceptable then the amplifier is happy. Now the frequency response of each crossover section, in parallel crossovers, is dependent only on the load, ie the speaker. So as long as each section is loaded by its rated load then it should behave reasonably. The science involved here is circuit analysis which tells you how to subdivide circuits until it becomes obvious what it does.
Date published: 2012-07-03
I have (2) five and a quarter speakers (cheap kind) that pop when there's too much bass. Can these cross overs help with that?
A band pass filter such as you reference here is designed more for a midrange speaker. This would block the low frequencies as well as high frequencies from your speakers. To simply block the lower frequencies from your 5-1/4" speakers, I might suggest the item linked below, a nice 100Hz high pass. This will block the lower frequencies, and still allow your speakers to play the higher frequencies if you do not have separate component tweeters.
Date published: 2013-04-04
Why does this filter have a 6db roll off and not a 12db roll?
If my woofer filter has a 12db roll off, my midrange has a 6 db roll off, and my tweeter filter has a 12db roll off, all drivers are 8 ohms. How would this affect the sound of my set up? Wont this make my woofer and tweeter 2nd order and my mid range would be 1st order? I would just buy two 3 way 12db slope xovers but for my application I'm putting them in it would not work with the amps I'm using.
There are two issues here. What impedance will the amplifier see? This depends on the sum total of all the impedances of all the crossover sections and all of the drivers for the full frequency range. If that is acceptable, then go to step two.This filter has a 6 db roll-off because it is a first order filter. There is nothing more to it than that. It also means that it will have a specific phase alignment that, combined with driver placement issues and driver characteristics, may be either good or bad for the sound of your speaker. I can't say for sure which without actually engineering the thing for you.
Date published: 2013-01-29
Converting this 6db octave bandpass filter to a 12db octave bandpass filter?
I know I need another capacitor and coil but in what order would I solder these in? Also are the capacitors and coils going to be of the same values or different values? I have to make this a 12db bandpass, it's cutting my mid range by 25% being a 6db octave bandpass and it doesn't sound right to my ears. All my other filters (highpass and lowpass) are 12db and are only cutting the volume by 1/16 which to me is a big difference, my mid range is lacking the correct volume and it's a very efficient speaker.
The slope of the crossover will not help the difference in volume between the drivers. You need an L-pad to bring the overall volume down. I would recommend the one below assuming its an 8 ohm driver.
Date published: 2013-04-27
What value is capacitor would I need to have a 3k upper cutoff?
Is the 22mF cap for the low freq end of the crossover. Is there a second capacitor and if so what is the value of it that produces the 5k upper cutoff with an 8 ohm load? I plan to get the closest value capacitor to give me a 3K upper cut off frequency. Thanks
The cap cuts off the lows and the inductor cuts off the highs. There is just the one cap.If you want to change the range to 800-3k, this requires an inductor change (actually both figuring a narrow bandpass).An 800-3k crossover can be made with a 18uf cap and .58mh inductor (narrow calculator).PE sells these parts. 255-040 and 027-346 will get you close for around the same price. All you need to do is wire them in series on the positive lead (terminal cup + to cap, out of cap to inductor, out of inductor to + terminal on driver).
Date published: 2013-09-22