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800 Hz Low Pass 8 Ohm Crossover
Can this be added onto an existing 2 way crossover?
I took apart my old Optimus 650 3 way speakers and noticed there is only a 2 way crossover. The woofer gets full signal. The tweeter is connected to a high pass and the mid range band pass. I was thinking about tossing this in line with the woofer. Would this effect the ohms? All 3 speakers are 8 ohms.Or would I be better off getting a 3 way crosssover?
Ideally, they would have designed the speaker using the natural cutoff of the woofer. So adding the crossover might reduce the tonal quality. Or they were just saving cost, in which case adding the crossover would help. But you would have to first figure out the crossover frequency of the mid-range. If you think the speakers have to much mid-range, you can give it a try. Adding the low pass filter will increase the impedance slightly because of the resistance of the inductor wire in the filter.
Date published: 2013-11-19
does the x over show which side is in and what is out to the woofer
Yes the board is labeled to show which is which.
Date published: 2013-06-18
This would be 1600Hz LowPass for a 4 Ohm driver, right?
In essence, yes you will have a crossover starting its roll off at 1600Hz.If this were a First Order Crossover (-6dB or inductor), then hooking an ideal 4ohm load to a rated 800Hz @ 8ohm would push the crossover frequency down to 400Hz. Since this is a second order crossover(-12dB or series inductor and shunt capacitor), you cannot make assumption. The crossover point diverges with a ideal 4 ohm load because each of the passive's crossover point is determined by the load. I'll show some maths to show the point.First Order LP ButterworthL=R/(6.28*f)If R=8, f=800; then L=0.00159H or 1.59mHNow if we place a 4ohm Load, the frequency of crossover will be:Solving for ff=R/(6.28*L)If R=4, L=0.00159; then f=400The second order LP Linkwitz-Riley(See NOTE) Equations:L=R/(3.142*f) and C=1/(12.563*R*f)If R=8, f=800; then L=3.18mH and C=12.44uFNow we are going to place a 4 ohm load on this circuit.Solve for f (fl crossover frequency of inductor, fc crossover frequency of the capacitor)fl=R/(3.142*L) and fc=1/(12.563*R*C)If R=4, L=3.18e-3; then fl=400If R=4, C=12.44e-6; then fc=1600So halving the load on the series inductor lowers the crossover point(like in the first order xover), but doubles the shunt capacitor's crossover point.Using this crossover ,as is, on an ideal 4ohm load you will get 6db roll off at 1600Hz then at 400Hz your roll off will be 12db.**NOTE** There many Second order Equations(Linkwitz-Riley, Butterworth, Bessel, & Chebychev). I choose Linkwitz-Riley because I had it on hand and any choice will illustrate the idea. It in no way implies that is the alignment of crossover in question. (If the photo is of the actual crossover; based on the capacitor value of 17uf, I would guess this is a 2nd order LP Butterworth crossover.)
Date published: 2013-11-19
I want to 3D-print a Speaker Wire Terminal Plate and incorporate a mount for this x-over. Does anyone know the PCB dimentions of this x-over ?
I have ordered one but I would like to start on the build before it arrives.
The PCB measures 4-3/4" L x1-7/8" W.
Date published: 2013-10-17
mounting inside cabinet
I don't see any screw holes so how do you recommend mounting it? If glue what kind?
You can drill through the board. I would put two holes somewhere around the large inductor. As long are you are mounting into wood or something none conductive, you should not have a problem with shorts from your mounting screws. If you are worried, make the hole have generous clearance from your screw and pick up some plastic washers. Then again, start with a bit larger than your screw head to remove the metal clad, then finish the hole with something a little larger than your thread diameter.I have mounted crossovers with hot glue (only on flat horizontal surfaces) and epoxy (mix it up) type glue on sides or the top.I have also fabricated a board to hold the crossover with scrap, cable ties, and hot glue, and then mounted the board to my box.I hope this helps and best of luck with your install.
Date published: 2013-05-10
I have a goldwood GW-s525/8. It is an 8 ohm speaker but when using this low pass filter I can still reach over 4khz. How can I stop this? Or am I doing something wrong?
At 800Hz crossover, a 12 db. per octave roll off you will get minus 12 db at 1600 hz [about a notch below half volume]. At 3200 Hz you will get minus you get minus 24 db [about one quarter volume] At 6400 Hz you get minus 36 db [about one eighth volume]. So, a roll off filter does not eliminate the signal, it reduces it at it's the specified rate. This is to give you a smooth transition from bass to mid/tweet.You can still hear the 4khz at that rate. Now this is assuming that your inputs and outputs are correct. I have been known to reverse them. OOPS!
Date published: 2013-11-07