Jay Dreier Posted October 15, 2018 Report Share Posted October 15, 2018 Just hoping to get some feedback from you guys. Its been at least 10 years since I have built my last enclosure. I have been doing a lot of research lately and I think I'm close to where I want to be with this design. Measurements are as follows -- Outside measurements 31"W X 19" X 16.25"T - Net Vol 2.56, Port Size 3.125 X 13.25 x 32" long, tuned to 32hz. Going to have a 1500 watt RMS Zapco running it until I can upgrade. It going into a Saturn Vue. Any help or suggestions you can offer would be greatly appreciated. Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted October 15, 2018 Report Share Posted October 15, 2018 Overall, you design looks pretty good, here are a couple of my thoughts on things you may want to change. 1. Your port area is on the very edge of what's acceptable on 1500 watts, if you are going to run more power in the future you will want more port area. 2. Where you have the kerfed port (as indicated by "A") I would add a 45 panel covering the inside of the kerf. Kerfed panels are weaker than a regular panel. 3. The inside corner of the port (indicated by "B") should be rounded over as much as practical. 4. Making the interior port panels double thickness as you have shown probably isn't gaining you anything as long as they are properly braced. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
Joe X Posted October 15, 2018 Report Share Posted October 15, 2018 10 hours ago, Jay Dreier said: Measurements are as follows -- Outside measurements 31"W X 19" X 16.25"T - Net Vol 2.56, Port Size 3.125 X 13.25 x 32" long, tuned to 32hz. Going to have a 1500 watt RMS Zapco running it until I can upgrade. It going into a Saturn Vue. I have box specs from your dimensions of 2.5 net @ 33.6 Hz 41.4 square inches of port area, 1" wood, port area came out good with my software: Zv5 12", 2.5 net @ 32Hz, 41.4 square inches of port area, 2000W RMS : My main recommendation is to go for a 15" instead of a 12" since your vehicle is rather large, it will be more efficient and louder on the same power. Link to comment Share on other sites More sharing options...
Jay Dreier Posted October 18, 2018 Author Report Share Posted October 18, 2018 Unfortunately I already have the ZV5 12" or a 15" would have been nice. So I added the 45 on the kerfed wall and in the port. I also made the interior port a single wall as suggested. And thank you for bringing up the port area because I do intend to upgrade my amp soon and I didn't even think about it. The new measurements are as follows - 35"W x 19.75"D x 16.75"T - Net Vol 2.58, Port Size - 13.75"T x 3.75"W x 40.75"Long, tuned to 33.3 hz. If you got the time to take another look at the changes I made that would be great. I'm hoping to get started and the build on Thursday! Link to comment Share on other sites More sharing options...
mestapho Posted October 18, 2018 Report Share Posted October 18, 2018 Just curious, how do you measure the length of the port in this case? With an aero port only the non flared port counts toward length, right? So do you measure this down the center to where the kerf starts? Link to comment Share on other sites More sharing options...
Jay Dreier Posted October 18, 2018 Author Report Share Posted October 18, 2018 I have always started the measurement half way into the kerf down the center of the port. So the kerf radius on this box is 4.5", so I start measuring 2.25" into the port. Link to comment Share on other sites More sharing options...
Jay Dreier Posted October 18, 2018 Author Report Share Posted October 18, 2018 Example: Port Length would be 40.75" Link to comment Share on other sites More sharing options...
Joe X Posted October 18, 2018 Report Share Posted October 18, 2018 4 hours ago, Jay Dreier said: The new measurements are as follows - 35"W x 19.75"D x 16.75"T - Net Vol 2.58, Port Size - 13.75"T x 3.75"W x 40.75"Long, tuned to 33.3 hz. If you got the time to take another look at the changes I made that would be great. I'm hoping to get started and the build on Thursday! 35"W x 19.75"D x 16.75"T port: 13.75"T x 3.75"W x 40.75 " This time I get like 2.9 net @ 32.1 Hz with 51.6 square inches of port area, 1" wood. A little on the big side and kind of record breaking port area for a single 12" Link to comment Share on other sites More sharing options...
Jay Dreier Posted October 18, 2018 Author Report Share Posted October 18, 2018 Thanks for responding so quickly! I'm supposed to start the build tomorrow. LOL ........So the wood that I'll be using is 3/4" birch. Meaning that in the drawing where it's double walled is actually 1.5" not 1". Taking that into consideration I come up with 2.58 net @ 33.29 hz with 51.6 sqin of port area. I brought my port area up some from the 1st design to accommodate upgrading from 1500 watt amp to a 2000 watt amp in the near future. Does that change your thoughts on this design? If so what are they? Thank You! Link to comment Share on other sites More sharing options...
Joe X Posted October 18, 2018 Report Share Posted October 18, 2018 So your box will work well as it stands, is just that I have a little time to answer the question, if using 3/4" birch then your port area is 54.4 square inches, did the following to figure your box specs (some minor assumptions were made) : From the chamber base area shown in light blue you can figure gross volume, subtracting the sub and cross brace displacements you arrive to 2.8 net @ 33.2 Hz, 54.4 square inches of port area. On the port area, no much more than what Sundown suggests is needed if you keep to rated power of 2K, about the 21 m/s of peak airspeed @ 2000 W for the 41.4 sqin you gave last time, only if you were to run 3000 W you would need that much port area, and you would still be at about 23 m/s with the 54.4 square inches, so how extra port area affects you? Mainly a heavier and bigger box, only if you port were too long you would have to deal with port resonances (yours is not) . Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.