| regal |
I have been working with the ported.xls program from diysubwoofer.com.
When I insert a 80hz 12db crossover the frequency plot shows the rolloff starting about 30hz lower (50hz.) It does do this on a sealed plot.
Is this correct does a ported box effectively lower your crossover point? This would be a real advantage if you have a reciever with too high a crossover. |
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| mwmkravchenko |
Then we could make some sort of answer. Out of the blue my best guess is that you are unfamiliar with the program or you entered some incorect data.
Mark |
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| regal |
| I double checked everything. When you put a crossover of a given frequency on a sealed box the crossover point occurs at a higher frequency than with a ported box. |
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| richie00boy |
| I think you are looking at max SPL plots instead of reference 1W or 0dB plots. |
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| simon5 |
| Maybe the ported box SPL response is peaking around 50 Hz without a crossover, so yes if you use a crossover at 80Hz it will begin to rolloff at a lower frequency because you need to kill the peak first. |
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