Hello, I am new to this but a am attempting to make a 2x18 subwoofer cabinet that I can use for my bass guitar. I am going to use eminence sigma pro 18a-2 speakers.
power rating: 650watts rms; 1300watts music program
resonance frequency (fs): 28Hz
usable frequency range: 41Hz-2.4kHz
mechanical Q (qms): 8.28
Electromagnetic Q (qes): .30
Total Q (qts): .29
Compliance equivalent volume(Vas): 441.2 liters
peak diaphragm displacment: 695cc
Maximum linear excursion(Xmax): 6.1mm
I play alot of music that I want deep, booming, massive, loud, clear, Bass.
I have used a few online calculators for the enclosure and and came up with...
Height: 28.5 in.
Width: 46.1 in.
Depth: 17.6 in.
This makes the total volume of the enclosure 379.8 liters or 13.4 Ft cubed. the recommended enclosure volume is 3.3-7.5cu. ft for one so im guessing 6.6-15 cu ft. for 2?
My biggest trouble is tuning the ports. I have heard that the best balance between SPL (getting loud as possible) and SQ (sound quality) is about 32Hz so here are a few calcuation a i came upon on the web and said the minimum port diameter size should be 8.73 in. which seems a little big to me.....
but if i tried two 6inch ports the vent legths would have to be 6.71 in. in length. why is it the less quantity of ports & smaller diameter ports need to be shorter?
my questions are...
what kind of porst should i use?
how should I brace the inside for stability?
Will I need high pass or low pass filters? or crossovers?
should I have a fabric on the inside?
should i make the box the maximum manufacture recomended }volume(15 cu. ft.) to increase deepness?
should i consider bandpass?
i am looking for rediculously deep, clear, loud, massive booming bass, for reggae, hip-hop, rock music. any help or recomendations would be greatly appriciated. thank you.