Xiao Kuang Posted March 13, 2015 Report Share Posted March 13, 2015 Here's a video of my transmission line build for a Soundqubed 8" subwoofer. It SLAMS!! https://www.youtube.com/watch?v=csuEtZBGLWg Link to comment Share on other sites More sharing options...
Trey Inglett Posted March 31, 2015 Report Share Posted March 31, 2015 I have a planet audio 1500 watt ac10d and I need T-line box size free air 39 hz Qes 0.976 Qms 4.47 Vas 0.988 cu ft Xmas one way 10 mm sensitivity 86db mounting death 4.75 inches plz help Link to comment Share on other sites More sharing options...
ChatraN Posted April 1, 2015 Report Share Posted April 1, 2015 for T-line boxes we would prefer subs with Low ish QTS. cause we have a large piston of air trapped inside de box and it's going to Load the cone movement no mather what. if the Qts is too high the sub may not perform very well under huge loads. the FS will be lowered a bit cause the added mass on the cone too Low Qts means a stronger motor force and vice-versa stay at the 0.40 to 0.50 range if possible. Link to comment Share on other sites More sharing options...
jroo Posted April 4, 2015 Report Share Posted April 4, 2015 I am still leaning towards doing a reduced line area t line tuned in the lower to mid 20s. If I reduce the area by 35 or 40 percent I can make it work. Do you think I would be ok with this much reduction in area? It's still almost 230 inches.... You can reduce the area of the line, but it will come at a cost of reduced efficiency. You need to keep the mouth area the same to avoid vent noise. If you reduce the taper the line will probably have to lengthen to keep tuning the same. Its all a big balancing act and everything you change will have an effect. As far as how to mount the subs on the line, you want the middle of each sub to be equal distance from the ideal mounting point (38.5" from the closed end in this case). So if you can't mount them side by side, you could mount one 6" or whatever in front of the ideal spot and the other 6" or whatever behind the ideal spot. As long the they are both equal. I didn't really explain that well, but hopefully you get what I'm trying to say. Is there a rule on how much you can reduce line area? I see a few designers say they do this but trying to figure out what the rule is, ex. is up to 20% acceptable? Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted April 6, 2015 Report Share Posted April 6, 2015 I am still leaning towards doing a reduced line area t line tuned in the lower to mid 20s. If I reduce the area by 35 or 40 percent I can make it work. Do you think I would be ok with this much reduction in area? It's still almost 230 inches.... You can reduce the area of the line, but it will come at a cost of reduced efficiency. You need to keep the mouth area the same to avoid vent noise. If you reduce the taper the line will probably have to lengthen to keep tuning the same. Its all a big balancing act and everything you change will have an effect. As far as how to mount the subs on the line, you want the middle of each sub to be equal distance from the ideal mounting point (38.5" from the closed end in this case). So if you can't mount them side by side, you could mount one 6" or whatever in front of the ideal spot and the other 6" or whatever behind the ideal spot. As long the they are both equal. I didn't really explain that well, but hopefully you get what I'm trying to say. Is there a rule on how much you can reduce line area? I see a few designers say they do this but trying to figure out what the rule is, ex. is up to 20% acceptable? There is no rule like "20% is OK, but 21% will ruin output". Reducing line area costs you output, the more you reduce it the more it hurts output. Its up to you to decide how much you want to give up to save space. The good news is you don't have to guess. You can simulate your box in Hornresp and it from that you can tell exactly how much you are giving up by reducing the area of the line. "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...
dbmode2 Posted April 11, 2015 Report Share Posted April 11, 2015 90 days on my very first build 1/4 wave box tune at 31hz sounding like 12's with 2 8 inch sub zero problems no port noise life is great Link to comment Share on other sites More sharing options...
Andrew Storlie Posted April 19, 2015 Report Share Posted April 19, 2015 ok ive heard alot of good info on TL boxes and i want to know what they are used for? i assume they are used for SQL but im sure thats not the only thing, ive built alot of boxes, but never a TL, i would really like some help designing a TL box for a 12" sub... if anyone can help let me know. im going for SQL not SPL. i only plan to run about 500-600rms for the sub. basicly im tring to figure out if i should do ported, sealed, 4th order, 6th or TL for SQL. i will give more info on the sub stage upon request. Link to comment Share on other sites More sharing options...
Da-Hoe Posted April 22, 2015 Report Share Posted April 22, 2015 Can anyone help me with a quarter wave box design for (2) 15 inch vvxv2 dual 4 ohm subs. with a skar rp1500.1d running at1 ohm for my tahoe. i have 48 wide x 38 deep x 21 high to work with. My previous setup was a horn enclosure and hit very hard for 2 12s but the new setup is lacking in sound with the box skar designed. I like hard deep bass and just need help getting it back please Link to comment Share on other sites More sharing options...
Andrew Storlie Posted April 22, 2015 Report Share Posted April 22, 2015 Can anyone help me with a quarter wave box design for (2) 15 inch vvxv2 dual 4 ohm subs. with a skar rp1500.1d running at1 ohm for my tahoe. i have 48 wide x 38 deep x 21 high to work with. My previous setup was a horn enclosure and hit very hard for 2 12s but the new setup is lacking in sound with the box skar designed. I like hard deep bass and just need help getting it back please i dont think 2-15" in a 1/4 line are going to fit, that gonna need like 18 cubic feet of space, if not more Link to comment Share on other sites More sharing options...
Da-Hoe Posted April 22, 2015 Report Share Posted April 22, 2015 Can anyone help me with a quarter wave box design for (2) 15 inch vvxv2 dual 4 ohm subs. with a skar rp1500.1d running at1 ohm for my tahoe. i have 48 wide x 38 deep x 21 high to work with. My previous setup was a horn enclosure and hit very hard for 2 12s but the new setup is lacking in sound with the box skar designed. I like hard deep bass and just need help getting it back please i dont think 2-15" in a 1/4 line are going to fit, that gonna need like 18 cubic feet of space, if not more i have about 20 cubic feet. Link to comment Share on other sites More sharing options...
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