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HI everybody! greetings from mexico; first, thank you a lot for your useful posts, i was able to learn a lot reading here...
well im posting for first time, asking help with my first ever speaker cabinet for guitar, specifically about porting... i need to know the better intonation, or even if is dangerous to my speakers the porting, based on their specs...
during my research ive found so far:
1-that in guitar is needed to tune ports at the resonant peak of speakers to avoid the cabinet become "weak" (mines peak is 90hrz)...
2-that need to be tunned at the lower usable freq to reinforce lows (my speakers min. usable freq. is 70hrz)
3-that ports can be tunned under the lower speaker frecuencies, to allow reproduce lower tones, example 60 hrz...but later read too, that if i do this, response become weak and lifeless for guitar...
4-and even that guitar speakers can damage with porting!!!
so im really concerned, want to bring the better posibble juice from my speakers but didnt want to destroy them or accelerate wear...
my baffle thickness is 0.708" (18mm), i currently had four 3" round cuts without port tube, that if my calculations are correct, tune my box to 74 hrz... (unfortunately i didnt ask before actually cut those!!!), but i wanna know specifically wich diameter and port length is better to my speakers? do i need to cancel holes? cut larger?, or even do frontal bafle again?? actual holes are okay?? please any help regarding this topic are really aprecciated!
i calculated this way (inches):
vol of bracings:
-4 “A” parts: 33.07 x 1.574 x 0.787 = 40.965 x 4 = 163.86
-4 “B” parts: 17.244 x 1.574 x 0.787 = 21.36 x 4 = 85.44
-4 “C” parts: 11.496 x 0.984 x 0.984 = 11.13 x 4 = 44.52
-1 central reinf: 13.07 x 20.39 x 0.708 = 188.68
sum: 163.86 + 85.44 + 44.52 + 188.68 = 482.50
________________________________________________
cab internal size: 13.07 x 20.39 x 33.07 = 8813.065
________________________________________________
________________________________________________
real internal vol, (vol minus bracing): 8813.065 - 482.50 = 8330.565
________________________________________________
total: 8330.565 pg3 = 136.5135 liters = 4.82 ft3
P.D. unfortunately im not that good with english to translate everything, but i did a step by step construction thread here in spanish: "2x12 plywood emminence lil'texas" ...hope this be useful, any explanation please ask...
and thanks i advice!
well im posting for first time, asking help with my first ever speaker cabinet for guitar, specifically about porting... i need to know the better intonation, or even if is dangerous to my speakers the porting, based on their specs...
during my research ive found so far:
1-that in guitar is needed to tune ports at the resonant peak of speakers to avoid the cabinet become "weak" (mines peak is 90hrz)...
2-that need to be tunned at the lower usable freq to reinforce lows (my speakers min. usable freq. is 70hrz)
3-that ports can be tunned under the lower speaker frecuencies, to allow reproduce lower tones, example 60 hrz...but later read too, that if i do this, response become weak and lifeless for guitar...
4-and even that guitar speakers can damage with porting!!!
so im really concerned, want to bring the better posibble juice from my speakers but didnt want to destroy them or accelerate wear...
my baffle thickness is 0.708" (18mm), i currently had four 3" round cuts without port tube, that if my calculations are correct, tune my box to 74 hrz... (unfortunately i didnt ask before actually cut those!!!), but i wanna know specifically wich diameter and port length is better to my speakers? do i need to cancel holes? cut larger?, or even do frontal bafle again?? actual holes are okay?? please any help regarding this topic are really aprecciated!
i calculated this way (inches):
vol of bracings:
-4 “A” parts: 33.07 x 1.574 x 0.787 = 40.965 x 4 = 163.86
-4 “B” parts: 17.244 x 1.574 x 0.787 = 21.36 x 4 = 85.44
-4 “C” parts: 11.496 x 0.984 x 0.984 = 11.13 x 4 = 44.52
-1 central reinf: 13.07 x 20.39 x 0.708 = 188.68
sum: 163.86 + 85.44 + 44.52 + 188.68 = 482.50
________________________________________________
cab internal size: 13.07 x 20.39 x 33.07 = 8813.065
________________________________________________
________________________________________________
real internal vol, (vol minus bracing): 8813.065 - 482.50 = 8330.565
________________________________________________
total: 8330.565 pg3 = 136.5135 liters = 4.82 ft3
P.D. unfortunately im not that good with english to translate everything, but i did a step by step construction thread here in spanish: "2x12 plywood emminence lil'texas" ...hope this be useful, any explanation please ask...
and thanks i advice!
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