mrazandrewm Posted December 14, 2014 Report Share Posted December 14, 2014 What is the maximum air velocity for a vented enclosure that wouldn't cause port noise? I have a 6" by 2.25" slot port so a 2.67:1 port ratio. Would that cause port noise with a Fi Q 10 on 1500w RMS? Vehicle: 2013 Ford F-150 STX SuperCab 5.0L V8 4x4 BIG 3: Knukonceptz Kolossus Fleks 0 Gauge OFC Power Amp Kit Headunit: Stock (Leaving factory look) Speakers: Stock Subwoofer: Incriminator Audio Lethal Injection 10" D2 wired down to 1 ohm Enclosure: ~1.5 cubic feet tuned to ~34 Hz (Port Area ~24 inches) Amplifier(s): Sundown Audio SAE1000.1D Amp Power Kit: Knukonceptz Complete 4 Gauge OFC Amplifier Installation Kit Link to comment Share on other sites More sharing options...
SQL50 Posted December 14, 2014 Report Share Posted December 14, 2014 I've heard a lot of different responses & opinions on air velocity, I just took a bunch of opinions, added up all the different air velocities & divided them by the number of opinions I read.. Jk lol, but for real, for the most part I've seen to keep it under 30 m/s.. If you go to input wattage I think it's called on Winisd, and put in 1500, then go to vents and put in the port information, then go to transfer function magnitude (at the top of the graph) and click that little dialogue box and go down to rear port air velocity and it should give you an idea.. Hopefully some more guys will chime in on the air velocity, I just made a new vented enclosure today, with 16.25 sq in of port per ft and it's under 30 m/s, haven't listened to it yet because the glue etc is curing, but If I don't have any port noise then I guess under 30 m/s works. Link to comment Share on other sites More sharing options...
Krakin Posted December 14, 2014 Report Share Posted December 14, 2014 Port per cube needs to die. Port area can be determined by using Richard Small's formula. you can use these formula's: http://www.carstereo...icles.cfm?id=21 http://www.diysubwoo...isc/portcal.htm Or this calculator for quick references. http://www.carstereo...icles.cfm?id=31 Krakin's Home Dipole Project http://www.stevemeadedesigns.com/board/topic/186153-krakins-dipole-project-new-reciever-in-rockford-science/#entry2772370 Krakin, are you some sort of mad scientist? I would have replied earlier, but I was measuring the output of my amp with a yardstick . . . What you hear is not the air pressure variation in itself but what has drawn your attention in the two streams of superimposed air pressure variations at your eardrums An acoustic event has dimensions of Time, Tone, Loudness and Space Everyone learns to render the 3-dimensional localization of sound based on the individual shape of their ears, thus no formula can achieve a definite effect for every listener. Link to comment Share on other sites More sharing options...
la negra Posted December 14, 2014 Report Share Posted December 14, 2014 im confused even more lol would some one care to help me model my next setup? i can't use my laptop to download load winisd Link to comment Share on other sites More sharing options...
SQL50 Posted December 14, 2014 Report Share Posted December 14, 2014 Guess I'm good to go, my minimum is 15.02. But anyways OP, have you tried that and checked your port area off of Krakin's links? Link to comment Share on other sites More sharing options...
mrazandrewm Posted December 14, 2014 Author Report Share Posted December 14, 2014 I'm not looking for port area. I know how much port area I need. I just want to know the velocity that it needs to stay under. Vehicle: 2013 Ford F-150 STX SuperCab 5.0L V8 4x4 BIG 3: Knukonceptz Kolossus Fleks 0 Gauge OFC Power Amp Kit Headunit: Stock (Leaving factory look) Speakers: Stock Subwoofer: Incriminator Audio Lethal Injection 10" D2 wired down to 1 ohm Enclosure: ~1.5 cubic feet tuned to ~34 Hz (Port Area ~24 inches) Amplifier(s): Sundown Audio SAE1000.1D Amp Power Kit: Knukonceptz Complete 4 Gauge OFC Amplifier Installation Kit Link to comment Share on other sites More sharing options...
SQL50 Posted December 14, 2014 Report Share Posted December 14, 2014 I'll post back tomorrow and let you know, I'm going by 30 m/s as of now. Link to comment Share on other sites More sharing options...
mrazandrewm Posted December 14, 2014 Author Report Share Posted December 14, 2014 Thanks SQL50. Vehicle: 2013 Ford F-150 STX SuperCab 5.0L V8 4x4 BIG 3: Knukonceptz Kolossus Fleks 0 Gauge OFC Power Amp Kit Headunit: Stock (Leaving factory look) Speakers: Stock Subwoofer: Incriminator Audio Lethal Injection 10" D2 wired down to 1 ohm Enclosure: ~1.5 cubic feet tuned to ~34 Hz (Port Area ~24 inches) Amplifier(s): Sundown Audio SAE1000.1D Amp Power Kit: Knukonceptz Complete 4 Gauge OFC Amplifier Installation Kit Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted December 14, 2014 Report Share Posted December 14, 2014 30 m/sec is my hard limit, though if I can get closer to 20 m/sec that's always nice though rarely happens. "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...
mrazandrewm Posted December 14, 2014 Author Report Share Posted December 14, 2014 I can't seem to get my enclosure port velocity below 30 m/s. I'll most likely be getting (90% sure of it) that I'll order a Fi BL 10" subwoofer. Do you think you can help me Triticum? Vehicle: 2013 Ford F-150 STX SuperCab 5.0L V8 4x4 BIG 3: Knukonceptz Kolossus Fleks 0 Gauge OFC Power Amp Kit Headunit: Stock (Leaving factory look) Speakers: Stock Subwoofer: Incriminator Audio Lethal Injection 10" D2 wired down to 1 ohm Enclosure: ~1.5 cubic feet tuned to ~34 Hz (Port Area ~24 inches) Amplifier(s): Sundown Audio SAE1000.1D Amp Power Kit: Knukonceptz Complete 4 Gauge OFC Amplifier Installation Kit Link to comment Share on other sites More sharing options...
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