thecat666

im running earthquake 6.5 mid bass and 1 inch soft tweeters up front, coax rear door speakers.genesis 4 channel amp running front and rear. diamond audio D3 12D4 x 2,currently being run by earthquake pa 4030 4 channel bridged 2 channel mode 2ohm. celestion ap 15 run by earthquake pa 2150 mono.also using pg line driver, and old school rockford 0eq1. what would the good people of this forum, recommend for a d-class mono amp for the D3 12D4 subs.all makes considered.please remember im in london england.i have been recommended,MASSIVE AUDIO - PRO P1000.1, i dont know much about this can any one shed some light? i would like to go 1ohm if possible.willing to look at all makes.thank you in advance.

this is my working out for 2 usd audio 1260's, 1130 / 41 = 27.56 / 4 = 6.89 ft (1/4 wave) throat length. 5.75 (1/2 of enclosure height) x 5.75 x 3.14 (pi) = 103.81 sq in. 103.81 x 2 (number of speakers) = 207.62 sq in 6.89/3 (number of folds) = 2.29 ft. 2.29 x 12 ( converting into inches ) =27.55 inches long. port length = 27.55 inches long, port area =23.06 sq in. is this correct its just something i want to try out

i would like some idea's please i have about 3.352 cft internal external 40.5"width 10.5"height 18 depth,i wish to use 2 or 3 old usd 1260 subs. speaker paremeter RE 5.24 QTS 0.39 QMS 15.60 FS 12.29 QES 0.40 XMAS 3.708 LE 1.01 Z 8 OMH PE 200 i would like to try and build a transmissione line box. i found this info for building the above box.please can any one help me all help will be gratefuly recieved. below is an example of how to make a transmission line 43.46 / 4 = 10.86 10.86 is the throat length of the enclosure. Designing a transmission line enclosure ________________________________________ sample specs. -- radiating area of subwoofer - 60 in^2 free-air resonant frequency of subwoofer - 26hz formula. -- speed of sound (1130) / resonant frequency / 4 = throat length throat width. -- radiating area of subwoofer / internal hight of enclosure = throat width ============================== using the sample specs i listed above we come up with 1130 / 26 = 43.46 =================================== now lets say the enclosure will be 14 inches tall. using one layer of 3/4 inch material, will yield a 12.5 inch internal height. now we figure the throat width. 60 inch radiating area / 12.5 internal height = 4.8 inch wide throat. ============================== lets figure 3 bends for example. 10.86 feet / 3 bends = 3.62 feet wide 3.62 x 12 = 43.4 inches wide. ============================== is this correct?. thanks for any help given

im trying to find out if this is the correct method for transmission line box, below is an example can some one please tell me if this is the correct way to work it out. 43.46 / 4 = 10.86 10.86 is the throat length of the enclosure. Designing a transmission line enclosure ________________________________________ sample specs. -- radiating area of subwoofer - 60 in^2 free-air resonant frequency of subwoofer - 26hz formula. -- speed of sound (1130) / resonant frequency / 4 = throat length throat width. -- radiating area of subwoofer / internal hight of enclosure = throat width ============================== using the sample specs i listed above we come up with 1130 / 26 = 43.46 =================================== now lets say the enclosure will be 14 inches tall. using one layer of 3/4 inch material, will yield a 12.5 inch internal height. now we figure the throat width. 60 inch radiating area / 12.5 internal height = 4.8 inch wide throat. ============================== lets figure 3 bends for example. 10.86 feet / 3 bends = 3.62 feet wide 3.62 x 12 = 43.4 inches wide.

the above figures are what came with the example,the others at the top are the actual speaker parameters for 1, usd 1260 sub .i have not posted my own workings out for that type of enclosure yet

just a few words to say hi to all just trying to upgrade my brain