28 m/s would be above any of the max air speeds I've seen suggested for any build.Hi,
I'm planning on building two LLT subs with 2 dayton titanic mk3 drivers I got for a great price.
I want to stick to Mr Steve Callas' specifications as much as possible but have run into an issue:
With a 6" port I have a peak airspeed of 28m/s and a port resonance of close to 250Hz. This air speed seems a bit high according to Collo's flare-it program. Will it be unacceptably noisy at max power?
With an 8" port I get a peak airspeed of 17m/s which should be noise free. The downside is the port resonance is close to 140Hz which is not a good thing according to the LLT spec.
Any advice on which of these 2 options I should go for would be appreciated.
140hz is well above the 80hz crossover point most folks use. I don't think you'd hear the resonance if you use the standard subwoofer crossover point. However 8" pipe can be tough to handle. You might try a square port instead.