I built a center channel speaker using a couple of factory buyouts and have a peak between 100 and 250Hz. I there anyway to get rid of it in the crossover? I'm using 2, 5 1/4" with a 1" tweet. My box is ported and tuned to around 75Hz. If I plug the port I get a smoother rolloff but no change above 100Hz. Really messes up the voices. Drivers are HP-5210 from parts express. Thanks
I just tried disconnecting one of the woofers, checked it with REW and still up 7db in that range. I recalculated my box volume, its .44 cu. Ft. After subtracting about 30 percent for drivers, crossover and port I am probably to small. Also, my slot port is in the middle so I wonder if that messes up the volume. I tried stuffing the hell out of it thinking I had resonance but that only smoothed the bottom end rolloff like when o stuffed a sock in the port. Probably just need to use these drivers for something other than center channel that's not all voices.
Try changing the height and tilt it up/down and see if you can put the floor diffraction null in this band. If you`re open to modifications - close the port and convert it to an a-periodic - you will loose some dynamics but this will equalize the peak, just vary the amount of resistive material in the hole until you get it right. Packaging foam ( the charcoal one ) works great.
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You must short the disconnected woofer, put some wire across + and - woofer terminals.
Be careful with this.
If the two drivers are connected in parallel your amplifier probably wont like a short circuit across its terminals. 😱
This problem is easy to solve using EQ. Acoustic countermeasures are much harder to do. Does your receiver have a built-in equalizer?
Another thing that could work is to add a series capacitor to the woofers. You might need to seal the port. A simulation program will tell, for example Boxsim. The capacitor will NOT just work as a high pass filter, as the impedance of the woofers is far from flat around the lower end of the pass band.
Another thing that could work is to add a series capacitor to the woofers. You might need to seal the port. A simulation program will tell, for example Boxsim. The capacitor will NOT just work as a high pass filter, as the impedance of the woofers is far from flat around the lower end of the pass band.
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Of course disconnected woofer is out of circuit! Than it should be shorted, because if not shorted it will behave like a passive radiator.
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