
Steve81
Audioholics Five-0
No worries, assuming that it's a 2nd order filter, that'll do the trick of protecting the driver at least, and 350W will push the driver to xmax. Even adding the lowpass at 80Hz, the system doesn't go to hell on group delay. As Dr. Mark implies, the port velocity around 20Hz at max power will be excessive with a 3" port, though with most content, it won't be a major issue. You'd need to drive the sub pretty hard at 20Hz to reach 20m/s air velocity from the port. Given the lack of more sophisticated filters, not to mention the lack of real world content that's going to drive the sub that hard at 20Hz, it should be an acceptable tradeoff. If not, seal the sumbitch.I will try a longer port. It’s the cheapest shot to try to save the design. If I don’t like the result, I’ll try the sealed or buy I comercial sub anyway.
The HPF is not adjustable and I don’t know what kind it is. Is just a standard filter that digital amps has on input.
I just thought that since I’m not liking my sub, I adjusted the receiver LPF crossover to 40 Hz (before judging me, I don’t reach my system limit!), the group delay of my sub is probably above the roof!!!!
@TLS Guy that model of driver is discontinued, so he'd have to buy something else.