holley2346

I have polk audio component sets in the front and coaxials in the back doors. I don't have experience with a lot of highs, but these sound great to me and keep up with the bass.

4 btls since you have 20 fuft No, but I would undoubtably go with BTLs, much more strength. I have had experience with btl 18's, bl 12's, and bl 18's. I can say that from my perception a BTL 18 has much more intensity than 2 BL 18's, but definitely moves less air.

Use calculators to determine the port size and length for the size of a specific enclosure. I prefer using tube ports, flared aeros.

They look like 8's in the pictures. Very Nice.

That was my next question, I can't really find anywhere to purchase some 3/4 or 1 inch lexan.

I envy those perfectly round holes that you cut.

i go to Auburn now, so i moved over here mid summer, i was in Montgomery area I live close to the prattville area, ~10 miles north of montgomery. Where did you get that glass laser etched at?

Still waiting on replies from mechman and DC. I have pictures of the install, but can't seem to find a usb mini cable anywhere.

I will consider the HO alt, but I will be adding additional batts for sure on the christmas build. I took my 2 yellow tops out, and am using one 70 AH battery, and wow lights dimming is overly rediculous. What H.O. alts would you recommend, and what website can I purchase them from? I shot an email to mechman about a 220 amp alt. We will see what happens.

It's all good. I think I enjoy designing and building more than I do actually listening. I am doing my best not to order a H.O. Alt right now. I know it would help a lot, I'd just rather keep modifications that can't be removed down to a minimum. Which is why I am not doing a wall with multiple BTL 18's. I have been talking to a distributor of DC, and am considering a DC lvl5 18 if I can get the price right. If anyone has heard these, or have opinions I would appreciate it. I have never heard any form of a DC sub, and there are not even any distributors of DC in AL.

The bl18's were sold a few months ago to a member on this forum.

Temporary rebuild for a month or two. I ordered 2 BL 12's back when I ordered my BL 18's, almost a year ago. And they have only seen a few seconds of free air. So I decided I'd give my BTL a break and use them for a couple of months until I get some new equipment and do a rebuild closer to Christmas. I built the box last night, took ~5 hours. I have it done, minus the double baffle, flush mount, and textured paint. I will post pictures after it is finished tonight. I used a 4" Aero port. The box is ~3.0 ft^3 after displacement, and I was wanting to tune to ~29, which required a 7" long tube. In my sketchup plans I completely forgot about adding the length of the flares, and realized after finishing up that 7" just wouldn't fit. So I am going to pick up an elbow and some additional pipe this afternoon. The subs sound extremely deep, despite the fact they are tuned a lot higher than I wanted. To get more air space I am likely going to make the port tube external and invert the subs. Here is the sketchup model, This is the build that I will work on around Christmas; Equipment I still need for the Christmas build; 2 PowerBass asa 800.2's Q Logic Kick Panel Enclosures (ordered) Another Polk Audio component set Some additional midrange/tweeter sets for real fill (still not decided)

Do you live in Al? If so I'd like to come see this if you wouldn't mind. The box looks extremely good.

I have had 1 BTL for around 6 months now and couldn't be happier. Tuned ~29 hz, sounds amazing and will tear stuff apart.

Would it be okay to mount the yellow tops on their side? I can't really find any other way to fit them under the amp rack.

I am using the following tool to figure out how long my aeros need to be to tune the box. http://psp-inc.com/tools.html It will be a ~5 ft^3 box I want to tune it to ~29 hz I am going to use 6" aeros http://www.parts-express.com/pe/showdetl.cfm?Partnumber=268-354 I want to use 4 of them, for the look it will give the box. What I'm wondering is after I put all this in the calculator, it tells me I need 69" of length. Is this per aero or all of them combined? I would hope that it would be inches total and not per aero. Thanks

Thanks Here is what I've got now, I'm revising it but the final should be pretty close. Please ignore the hole for the sub, the outside dimensions are accurate. And the back sloping panel is accurate. Equipment is: 2 Powerbass ASA800.2's 2 Eminence APT80 Horns (between the two amps on the top) 4 SEAS Prestige 4.5" midwoofers (I still am considering a couple of other drivers) 2 SB Acoustics 4" midranges 2 4" flared ports (from partsexpress) Also; already on hand: Sundown Audio 3000D Fi Audio BTL 18 2 Optima Yellow tops KnuKonceptz 1/0 This still isn't the final, but is pretty close. Opinions are welcome. It will be shorter than my existing box, should be close to ~16 inches high.

According to the calculator it should be perfect. The design is alright... it's just hard fitting all this stuff where it can be seen. I still don't have a place for my EQ/horns/additional drivers.

That looks good... I've decided to go with 2 4" ports because its so much easier. This is what I have as of now. That is with 2 PowerBass amps (top) and SA3000D on bottom. All dimensions are accurate. Suggestions are welcome. I am having trouble finding room for the bats.

If you get an elbow joint, not so much. The reason it's a problem in slots is the sharp corners muck with the air flow, but with a smooth bend in a pipe it's not as much of an issue. As long as you don't use a joint that comes to a right angle. I guess I could heat up some pvc and just bend it... I would like to have 2 6 inch ports. I guess I would essentially make an elbow though and extend it from the end point then go up to the top level of the box. I could then plexiglass a complete cover from the back of the box (aero side) all the way to the end of the usable area I have (the square at the bottom) and have all electrical and equipment in that.... hmmmmm Any other ideas for placement?

angles would effect flow through the tubes though, wouldn't it?

I would have to make them extremely long to tune down to ~29 hz with a 5 ft^3 box though....

That's what I'm using . I wish I could do 2 big aeros . It just looks so good. I still need to arrange where I am going to put batts/SA3000D/2 powerbass asa800.2's (or 2 soundstream pcx2.700's)/2 horns/6 midbass drivers/ and a 32 band equalizer. And pretty it all up. If anyone has ANY suggestions, I am open for anything. Thanks.

Ignore all that. For box-building, as long as the company tells you how big to make the box you're set. FI says between 5 and 10, so how big do you want it? After that you can just use whatever initial driver comes up when you do the wizard. The sub in the boxdoesn't change the tuning freq, all the various parameters do is make the graph behind it if you're the advanced type and can use that. So here: 1) Open WinISD, click "new" and then just hit "next". Select 1 driver, then vented box type. Now it should look like this: 2) So go under the "box" tab, put in the volume and tuning you want: 3) Now under the "vents" tab say how many you want and what diameter, in this example two 6" diameter ports: Now since your box is 5cu, even TWO sixers is way long, so if you just wanted one it would only need to be 13.37" long. 4) Now since we're doing aeros, you can calculate your box's internal volume by doing this: ((W-1.5)*(H-1.5)*(D-1.5)-Vp-Vs))/1728 Side note: 1728 is one cubic foot in inches, which is why we divide by it there. W = Width of the box in inches (external) H = Height in inches (external) D = Depth in inches (external) Vp = Port volume in inches, which we can ballpark at pi*r^2*L (radius/Length of the port), so 3*3*3.14*14 (again, this is ballparking, it won't alter the tuning THAT much) = 395.64 Vs = Sub volume in inches, 0.26cu for the BTL 18, so 0.28*1728 = 484 So now open up your handy-dandy google or calculator, start throwing numbers in until you get an answer around 5. For example: (((33 - 1.5) * (20 - 1.5) * (18 - 1.5)) - 395.64 - 484) / 1728 = 5.0554022 Meaning, your box could be 33" wide, 20" tall, and 18" deep with a 6" wide aero 13.5" deep and an 18" BTL sub in it for a 5cu box tuned around 29-30Hz. Thank you for your help

Could you provide me with a template for a BTL 18 for winisd? After entering the parameters it tells me that they don't work out. Thanks