Hi guys....
Many people say the port can be kept anywhere it does the same job.
But does the sound waves coming from the port and the sound waves coming from driver interact with each other differently based on where the port is ??
Let's say for a 2 way Bookshelf, a port on the front, or rear, or side, or at the bottom gives exact same result ??
Or does it depend on which frequency range the speaker is playing ?? In subs the wavelengths are too huge. In two way BS, we have smaller and larger wavelengths as well.
Any inputs will be greatly appreciated.
Thanks - Audfrknaveen
Many people say the port can be kept anywhere it does the same job.
But does the sound waves coming from the port and the sound waves coming from driver interact with each other differently based on where the port is ??
Let's say for a 2 way Bookshelf, a port on the front, or rear, or side, or at the bottom gives exact same result ??
Or does it depend on which frequency range the speaker is playing ?? In subs the wavelengths are too huge. In two way BS, we have smaller and larger wavelengths as well.
Any inputs will be greatly appreciated.
Thanks - Audfrknaveen
So we don't have to bother about all frequencies. Only port tuning frequencies matter and those wavelengths are huge. So port can be anywhere.
Will there be any issue of in phase Vs out of phase ..
Will there be any issue of in phase Vs out of phase ..
Dear Naveen,
Placing the ports closer to the driver increases the excursion of the woofer. Similarly, when you place them closer to the floor (or equivalent), the LF seems to be better. Any curves / bends in the port tubes also do not matter either.
Regards.
Placing the ports closer to the driver increases the excursion of the woofer. Similarly, when you place them closer to the floor (or equivalent), the LF seems to be better. Any curves / bends in the port tubes also do not matter either.
Regards.
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Avoid putting the port near tweeter, or high mid driver, less diffraction. If possible put the port on the back, midrange leakage from the port can be an issue and is somewhat less when the port is on the back. Standing waves in the port and inside the enclosure tend to want out throght the port and there is many ways you can try to lessen the leakage if it is a problem.
If possible make a prototype box and measure if there is problem with the port noise and you'll have a chance to do something about it. You can test other stuff with the same protobox as well, construction techniques if nothing else 🙂
If possible make a prototype box and measure if there is problem with the port noise and you'll have a chance to do something about it. You can test other stuff with the same protobox as well, construction techniques if nothing else 🙂
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Yes, where you put the port matters, of you move the port then the response will change, this has been shown many times
Yeah, but most often the Helmholtz resonance itself one is trying to produce with the port is pretty much the same no matter where the port. Tuning might change if the port entry is near a boundary making the port effectively longer but it is the noise like the leaking mids and shuffing that might be a problem and affected by position.
When placed on the front baffle, ports change the baffle radiation quite a bit, specially when close to the woofer. They also have resonances depending on their specific dimensions, and for a two-way system the effect can be a factor in the overall crossover design (which will need to account for these effects). There's another thread where the TL-like effect of placing the port very far away (top of a tall floorstander) is discussed.
If you're measuring the speakers before design all these effects will be included in the measurements.
If you're measuring the speakers before design all these effects will be included in the measurements.
Dear All...
Thank you so much for all the valuable inputs !!!
Once I finish the build I will try to post here .... Thanks a lot again !!! It was very helpful !!!
Thank you so much for all the valuable inputs !!!
Once I finish the build I will try to post here .... Thanks a lot again !!! It was very helpful !!!