VirginBanger Posted October 8, 2019 Report Share Posted October 8, 2019 I’m attempting to build my first 4th order would like some input from some experienced builders.. going to be running 2 15” sound stream T5.152 at half ohm on a t1.6000 soundstream amp. Was thinking of a 4 cube net sealed chamber with an 8 Cube net ported chamber with 156 Sq inches of port tuned to 45 hz. I do not have access to a computer or modeling software, should this set up play fairly loud and low? Those are the two main goals. Attached are the T/S of the subs as well as a recommended sealed enclosure chart that includes QTC and tuning frequency Link to comment Share on other sites More sharing options...
VirginBanger Posted October 8, 2019 Author Report Share Posted October 8, 2019 Any and all design changes and suggestions would greatly be appreciated, goal would be to be around 150 db Link to comment Share on other sites More sharing options...
VirginBanger Posted October 9, 2019 Author Report Share Posted October 9, 2019 Can anyone chime in? Really want to be guided in the right direction Link to comment Share on other sites More sharing options...
AaronT Posted October 9, 2019 Report Share Posted October 9, 2019 I can help a bit. I have no experience with 4th orders. But you really may want to consider a better amp. Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted October 9, 2019 Report Share Posted October 9, 2019 As far as your box specs go, those look pretty good. The subs you have should perform well in a 4th order bandpass box. The only change I would make would be to increase your port area. I would shoot for 200 sq in of port area. Since all the output comes out the port on a bandpass box, they are very sensitive to port noise and port compression. As far as meeting your goal of getting loud and low, things get more iffy. The box will certainly get loud, however like most ported boxes, you are likely to get your max output around the tuning frequency and bandpass boxes are tuned higher. Here is a graph showing the raw output from both your intended bandpass box (in red) and a 8 cu ft ported box tuned to 32 hz (in green). Please note this graph does not include the effects of cabin gain, which will boost low frequency output significantly. Cabin gain should boost both enclosure's output roughly the same so the comparison is still valid. The ported box is probably going to have more output between 35 Hz down to around 25 Hz. The bandpass will do better above and below that range. "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...
Triticum Agricolam Posted October 9, 2019 Report Share Posted October 9, 2019 2 minutes ago, AaronT said: I can help a bit. I have no experience with 4th orders. But you really may want to consider a better amp. The subs he has don't have huge Xmax, if he runs any more power than the amp he has is likely to put out, he will probably have issues with over-excursion. "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...
VirginBanger Posted October 9, 2019 Author Report Share Posted October 9, 2019 Thanks for the input, would there be a down side to shifting the tuning down to 40hz? Getting the port area up to 200 is possible, just a bigger hole to cut in the metal. Question about the port and tuning, the internal Height measurement of the box is 14”, I was planning on using 1/2” birch slid into and attached to the outter walls of the box, making the port height 13”. would this be considered a slot port for tuning purposes? Link to comment Share on other sites More sharing options...
AaronT Posted October 9, 2019 Report Share Posted October 9, 2019 Any electrical upgrades? Link to comment Share on other sites More sharing options...
VirginBanger Posted October 9, 2019 Author Report Share Posted October 9, 2019 320A singer alternator. Looking to get a better auxiliary battery as I only have a conventional Style currently rated at 220AH. 2/0 big 4. 2000 RMS in highs and mids to be ran as well Link to comment Share on other sites More sharing options...
VirginBanger Posted October 9, 2019 Author Report Share Posted October 9, 2019 2 hours ago, AaronT said: Any electrical upgrades? alternator isn’t here yet though, so I was planning on running it at 2 ohms for a while until I receive it and install it. Should be alright to run everything like that until then right? Stock alt only puts out 80A Link to comment Share on other sites More sharing options...
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