TheBetterMethod Posted December 12, 2010 Report Share Posted December 12, 2010 Hey guys, I'm wondering, how does the Fs of a sub change after break-in? I've deduced that the break in process which results in lower, louder playing is due to a lowering of the Fs of the woofer. Can someone confirm this (or correct me if I'm wrong)? It makes sense to me because the suspension will have less tension/stiffness after break in and this would cause the cone to return to rest more slowly, at a lower Hz than it did before break-in (which is what the Fs is all about right). My subsequent question is, If the above thought is true, how much can I expect the Fs to change after break-in? Would it be 1-2Hz, or more/less? Please someone with knowledge help me out with this, I want to learn. Thanks, -TheBetterMethod Quote 2005 Subaru Outback Wagon Pioneer 9400BH Fi Q 15, SAZ1500dV3 The first build>>> http://www.stevemead...-outback-build/ 140.9 @ 36hz Sealed on dash! REBUILT!!! 2 Fi Q 15s, 2 SAZ1500dv3 146.9 @ 39hz dBDRA certified Link to comment Share on other sites More sharing options...
Playa Named Joe Posted December 12, 2010 Report Share Posted December 12, 2010 I'm tuned into this too. I wonder the same thing. I want to make a t-line but not sure how accurate the measurements are after break in. I.e. DD and AQ, they only break in for one hour, which i wouldn't consider broken in all the way. Quote 1994 Pontiac Grand Prix build Link to comment Share on other sites More sharing options...
TheBetterMethod Posted December 12, 2010 Author Report Share Posted December 12, 2010 Yeah, that's the thing. The manufacturers give us the numbers based on basically fresh woofers. So if anybody has the answers, I'm sure there are more than just a couple of us that want to know. Quote 2005 Subaru Outback Wagon Pioneer 9400BH Fi Q 15, SAZ1500dV3 The first build>>> http://www.stevemead...-outback-build/ 140.9 @ 36hz Sealed on dash! REBUILT!!! 2 Fi Q 15s, 2 SAZ1500dv3 146.9 @ 39hz dBDRA certified Link to comment Share on other sites More sharing options...
bassl0va Posted December 12, 2010 Report Share Posted December 12, 2010 I'm guessing that it will go down, but not much, just a few hertz. But I'm positive that the change would be different for every woofer. Some companys may measure it with a broken in woofer, I guess you'd just have to ask the said company. Quote My RE MT 18" wall build Former build, farewell beloved wall.In progress, Toyota Starlet build This forum has a massive boner for ridiculous electrical upgrades. Link to comment Share on other sites More sharing options...
STEvil Posted December 12, 2010 Report Share Posted December 12, 2010 T-lines are tuned to what you want them to be, not to the Fs. Many people tune to the Fs because its easy. Its not correct, its easy. Break-in will depend on your usage habits. If you run a lot of excursion it will happen faster and you will lose latent (spider mainly) dampening capabilities. If you dont have excursion happening then break-in will take longer. Realistically break-in is mostly a myth and a non-issue, so dont worry about it. Quote MickyMcD - "Capable of making some serious trouser flapping volumes at where's-my-testicles frequencies, the Servo-Drives used to be fairly jaw dropping..." Any time you have have a power wire next to your frame put some rubber hosing (or cut up an innertube) around it. The wire is bound to wiggle (due to driving or flex) and the casing will eventually wear through. Hammerdown... 1% no links to outside websites, business related FB/YT pages allowed. Link to comment Share on other sites More sharing options...
TheBetterMethod Posted December 12, 2010 Author Report Share Posted December 12, 2010 Thanks for the input guys. Anyone want to add? Quote 2005 Subaru Outback Wagon Pioneer 9400BH Fi Q 15, SAZ1500dV3 The first build>>> http://www.stevemead...-outback-build/ 140.9 @ 36hz Sealed on dash! REBUILT!!! 2 Fi Q 15s, 2 SAZ1500dv3 146.9 @ 39hz dBDRA certified Link to comment Share on other sites More sharing options...
FiNaLaLmAsY Posted December 12, 2010 Report Share Posted December 12, 2010 My Soundstream SPLX124 has a FS(Hz)of 29hz. I know what it means but can someone give a good detailed explanation on it because i'm still kind of confused? Thanks! Quote 02 Nissan Sentra 4 DD 3500g 10's Crescendo Audio 3500 @ .5ohms Soundstream EGA4220 Fronts German Mestreo 6.5 Component Set 110Rms Rears RE XXX 6.5 Component Set 2ohms 220RMS 1 Dyralast Gold 1000Amp Battery 1 Vmax 2000amp Battery DC Power Inc 270XP Amp Alternator BIG 3 Upgraded All 1/0AWG Setup 8 1/0 Awg Runs Link to comment Share on other sites More sharing options...
kirill007 Posted December 12, 2010 Report Share Posted December 12, 2010 The amount of hz that the Fs will drop depends on the woofer itself, every woofer has different changes in T/S parameters. And there isn't really a true break in period, the spider will keep getting looser and looser, so Fs will keep dropping till the spider rips. And how long you need to 'break in" depends on the user + the driver itself so giving a estimate is impossible. Fs is just the resonant freqeuncy of the driver, like a sheet of metal has a resonant freqeuncy, the 'ting' you hear when you hit a sheet of metal. Quote Thinking is the root of all problems... You ALWAYS get what you pay for. Link to comment Share on other sites More sharing options...
n8ball2013 Posted December 12, 2010 Report Share Posted December 12, 2010 I'm guessing that it will go down, but not much, just a few hertz. But I'm positive that the change would be different for every woofer. Some companys may measure it with a broken in woofer, I guess you'd just have to ask the said company. I agree . Quote THERE IS NO BUILD LOG! 1998 Chevy Silverado ext cab Alpine CDA-9887 4 Team Fi 15s 2 Ampere Audio TFE 8.0 2 Ampere Audio 150.4 3 Digital Designs CS6.5 component sets Dual Mechman 370XP Elite alternators inbound! 8 XS Power d3400 6 XS power d680 Second Skin Stinger Tsunami Wiring Sky High A Real Voltmeter not a piece of shit stinger. Link to comment Share on other sites More sharing options...
OBI Posted December 12, 2010 Report Share Posted December 12, 2010 I know with the Lvl 5's and XL's, the FS of the subs are about 70hz out the box, and go down to 32-35hz after the spider has fully loosened up. Quote Link to comment Share on other sites More sharing options...
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