Need a crossover for a center channel I want to build this summer.
See attached for a pic of the front baffle. Volume is likely to be 1-1.25 ft^3, sealed. Front baffle dimension is 8"x20" WxL.
Drivers are:
Vifa DQ25SC16-04
Fountek FR88EX
2x Silver Flute W17RC38-08
The unit will be below ear level but can be tilted up to have its forward axis meet the ears.
Not looking to spend too much, as you can see from the driver selection. I am OK with steel-core inductors but would prefer poly caps. I expect the crossover points should be somewhere around 2 kHz and 400 Hz. Slopes are up to you.
See attached for a pic of the front baffle. Volume is likely to be 1-1.25 ft^3, sealed. Front baffle dimension is 8"x20" WxL.
Drivers are:
Vifa DQ25SC16-04
Fountek FR88EX
2x Silver Flute W17RC38-08
The unit will be below ear level but can be tilted up to have its forward axis meet the ears.
Not looking to spend too much, as you can see from the driver selection. I am OK with steel-core inductors but would prefer poly caps. I expect the crossover points should be somewhere around 2 kHz and 400 Hz. Slopes are up to you.
If anyone is wondering why I don't build the ZD3C design by Zaph, it's because it's more expensive. I already have the tweeter and the W17RC38 is cheaper than the RS180.
Would like to be able to get everything from solen.ca but it's not a must.
Would like to be able to get everything from solen.ca but it's not a must.
I'll do what I can to smooth things out, it's diffraction related though. Xover is going to be where everything lines up smoothly. Your ctc spacing is good to just over 4.1 khz.
No, but the Z axis is only a best guess based on looking at the driver blue print.
I will need a fairly significant amount of BSC. Where it's going, it will almost be like a L-R main.
Pic attached. I will mount it right underneath the PS3, above the receiver.
Pic attached. I will mount it right underneath the PS3, above the receiver.
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Also, I hope it's not too late to say this now, but the ears will be about 18" above the tweeter. The required spread is +/- 22 degrees.
Vertical will be fine still, but you could always tilt the speaker a few degrees up if needed. Horizontal is extremely good out to 30 degrees, and still very good past that.
I didn't see your image before, but yes you should tilt the speaker up at least 5 degrees. The mid needs 4 liters sealed, the woofers each need 10 liters with a 2" x 6.5" port for each woofer.
I like how this thread has a 1 star rating. Sorry for simulating a design for this guy 🙄
(I didnt see any iron core inductors on Solen, but you if you find an 18ga iron core I would use that on the woofer for a much cheaper solution)
I like how this thread has a 1 star rating. Sorry for simulating a design for this guy 🙄
(I didnt see any iron core inductors on Solen, but you if you find an 18ga iron core I would use that on the woofer for a much cheaper solution)
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As the only other person that posted anything in it, I feel compelled to let you know it wasn't me 😀. I never even remember ratings exist.
Wasn't me that posted the rating either... Thank you very much for your assistance.
What happens if I leave the box sealed instead of porting it?
Can you describe the slopes or any details you feel are particularly important?
What happens if I leave the box sealed instead of porting it?
Can you describe the slopes or any details you feel are particularly important?
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Acoustic slopes are: Woofer 2nd order LR, The mid HP is also 2nd order LR. The mid LP is 4th order LR, and the tweeter's also 4th order LR. Crossover points are 470 hz and 3700 hz. The Fountek is going to be the shining star, covering everything important.
You can try sealed, but I wouldnt advise it. There will be an impedance peak from the woofers right where the inductor is also causing a peak, which might lead to a boomy sound. You would only need 2" clearance behind the speaker for the 2" port to function properly. You could also drop down to four 1" x 7" ports for each woofer, then you would only need 1" clearance behind the speaker.
You can try sealed, but I wouldnt advise it. There will be an impedance peak from the woofers right where the inductor is also causing a peak, which might lead to a boomy sound. You would only need 2" clearance behind the speaker for the 2" port to function properly. You could also drop down to four 1" x 7" ports for each woofer, then you would only need 1" clearance behind the speaker.
How did you get the frequency and impedance plots for these drivers? From Zaph or the manufacturer? Or does PCD have a database of such things already?
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