Originally Posted by zheka
If I understand it correctly, it may be difficult to tune the box this low with reasonable port velocity and high enough port resonant frequency.Scott's LLT
is 25cu.ft ( 24"wide, 45" tall", 50.5" deep) is tuned to 11hz.
That's probably as low as it is reasonable to go with 8 inch port if
you cross the mains at 80Hz or lower. With higher crossover points the port resonant frequency may be an issue, you'd have to shorten the port and bump up the tuning even higher.
I am thinking a multitune box may be an option to consider. something along the lines this guy was doing with mach5 15 IXLs
that sub never seen the light of day. got an objection from the missus.
these, however, was built:
multiple tuning is indeed a viable option, just that not widely adopted. i built the slot ported to test if i could hear any port noise at 35m/s airspeed at maximum level that i could tolerate.
turned out i can't. so the next builds are designed with a max of 35m/s at max excursion.
ditched the slot port because they're a pain to construct. with a smaller port you're able to get longer length. thus higher port resonance. just set a maximum acceptable port airspeed to you and work so that the airspeed doesn't go over that while keeping with a smaller port.