Posted September 22, 201410 yr So going from my current setup to something more extravagant should spark your interest.Wanting to go with (4) SA-8 V.2's in a 4th order box with a 2:1 ratio. From what ive gathered so far on reading.. * Speakers facing sealed chamber(better cooling&so you can smell the coils if needed) * 15^3 inches of port area PER cubic feet of sealed chamber * The shorter the port the better * Ported chamber tuned to around 45-50 hz. Here is what ive come up with on Sketchup so far.Sketch is not to scale.Came up with - 2.6^3 feet in ported chamber and... - 1.3^3 feet in sealed chamber. Would love some input or constructive criticism/ advice and help since this is my first 4th order
September 22, 201410 yr Author Why a 4th? What vehicle will this go in?Im going for SPL on daily music. It will be going in an 08 Lexus ES350
September 22, 201410 yr Everything you described is a recipe for poor results. Its absolutely no different then walking down the street and asking someone "hey pick two numbers" "okay good i got my chamber volumes down, just gotta get a number for porr area and length and ill be good to go."Sorry if that comes across as being harsh, but i want it to be made clear.
September 22, 201410 yr Author Everything you described is a recipe for poor results. Its absolutely no different then walking down the street and asking someone "hey pick two numbers" "okay good i got my chamber volumes down, just gotta get a number for porr area and length and ill be good to go."Sorry if that comes across as being harsh, but i want it to be made clear.Where do you recommend i start then?im lost now :?
September 23, 201410 yr I would use a ported enclosure and I probably wouldn't use 4 8"s for the sake of cost (2 12s would have a little more cone area and cost around half as much), but perhaps the 8s fit better in the trunk? 4th order bandpass won't offer any more output over a ported enclosure (okay it might but it'll be a tiny amount more over a limited frequency range) and it'll have have a shorter bandwidth. As to the bullet points you made above: there is no relationship between port area and enclosure volume, there is no correct "ratio" for chamber volumes, and shortening the port length merely raises the tuning frequency--which could be good or bad, but without context is meaningless advice.
September 23, 201410 yr Everything about the build you've described so far is setup for failure. Listen to SSH. Seriously.
October 7, 201410 yr Author Decided to just go Ported since apparently my numbers were off. So here is what i have so far.Should get to wrapping in vinyl tomorrow which will match my interior.
October 7, 201410 yr Author Got some good wood working skills, I'm jealous. Why thank you! they have defiantly gotten better since my early days of enclosure building that's for sure.
October 11, 201410 yr Author Picture update. Ordered the other 3 SA-8's and Got the box wrapped and the subs wired up. Heres the final result. Before you mention the "Staples" comment, save it. I've already heard it.
October 11, 201410 yr Author Also made a temporary amp rack until i get my other amps and batteries.Have to say tho, those 6 SA-8's slam on that SAZ-3500D even tho it gets pretty hot since its on .7ohms.. Edited October 11, 201410 yr by Kent
October 11, 201410 yr Nobody can sit back there unless they want to laydown...I wanted some sa subs but pockets ain't deep yet...nice build
October 13, 201410 yr Why didn't you take the backseat out and lay the box on the floor ? Nobody can sit in the back.You could fire the subs through the cabin, from the trunk. How do you like it now ?
October 13, 201410 yr Author Why didn't you take the backseat out and lay the box on the floor ? Nobody can sit in the back.You could fire the subs through the cabin, from the trunk. How do you like it now ?I wanted to keep the backseat in for aesthetic purposes and to keep it looking nice. My next build will most likely be a 4th order box in the trunk with the port blowing through the cabin pass through that is in between the back seats. Overall i love the current setup i have now. I was very disappointed when i tried it out after finishing it. But then after putting the seaports, the SA-8's came alive. Then again the box was calculated to be ported to begin with.. guess i just wanted to hear them asap before the aeroports arrived in the mail.
December 12, 201410 yr Buddy if mine had 2 10 in 4th order set up the way you describe in an integra 4dr. Loud as hell and would shake am/pm windows like crazy. Seal side set to mfg seal spec. Ported side set to 2:1 @ 45hz. Plays everything.
December 13, 201410 yr Buddy if mine had 2 10 in 4th order set up the way you describe in an integra 4dr. Loud as hell and would shake am/pm windows like crazy. Seal side set to mfg seal spec. Ported side set to 2:1 @ 45hz. Plays everything.your buddies a moron that drink dipshit koolaid. Absolutely retarded way to "design" a box.
December 13, 201410 yr Buddy if mine had 2 10 in 4th order set up the way you describe in an integra 4dr. Loud as hell and would shake am/pm windows like crazy. Seal side set to mfg seal spec. Ported side set to 2:1 @ 45hz. Plays everything.your buddies a moron that drink dipshit koolaid. Absolutely retarded way to "design" a box. Yeah 2:1 ratio only works for quick trips. 3:1 is for am/pm.
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