Jam Havoc Posted January 15, 2015 Report Share Posted January 15, 2015 Hi, I have a question. I'm building a new ported enclosure for my subwoofer and I wanna know what the peak freq is in my car. I will try to determine by ear but just in case I'm wrong I want to check it with a decibel meter. I've downloaded an app on my iPhone that's pretty accurate but I'm wondering if the mic on an iPhone 6 can pick up frequencies between 30hz-40hz at the same amount of db's because I've seen a graph of older iPhones showing that it drops slowly below 50hz. Is there anyone who has experience with this or knows if the iPhone 6 mic can pick up 30 / 40hz at 0db? Greetings Link to comment Share on other sites More sharing options...
Marquisboys Posted January 15, 2015 Report Share Posted January 15, 2015 Pretty sure it would only pick up like 80db or so 2004 Grand MarquisAA Mayhem 18Crescendo 3500d6.5's AQ Pro AudioAQ Super TweetsImage Dynamics 6x9Soundqubed 125.4MB Quart 80.4144.2 db GONZO 2013 Chrysler 300S Granite Crystal Metallic Exterior Inferno Red Interior 5.7 HEMI AWD LMI Air Hammer Intake Corsa exhaust Custom Tune Link to comment Share on other sites More sharing options...
Jam Havoc Posted January 15, 2015 Author Report Share Posted January 15, 2015 Yes it won't meassure full db's, maybe 100 max but I will test it just to see the difference between freqs so I'll keep the volume below that point. It's just that I don't know if the mic cuts off at low freqs. It has to record at 0db between 30-40hz Link to comment Share on other sites More sharing options...
Emmet Posted January 15, 2015 Report Share Posted January 15, 2015 The microphones on mobiles have nowhere near the ability to measure pressure than spl oriented meters. Hate to burst your bubble. I've read that some iphone apps (musicsafecheck and safenoise) are accurate to +/- 2db when under 100db but above that it starts becoming pretty inaccurate, if 2db isn't inaccurate enough. i shook this one kids hand and it just folded in mine. long story short i fucked his girlfriendso.. yeah.. You want this to happen to you? Give decent handshakes people. I was gifted with an innate ability to distribute wholesale ass beatings in a timely and orderly fashion. Link to comment Share on other sites More sharing options...
jk13 Posted January 15, 2015 Report Share Posted January 15, 2015 110dB is maximum on Apple devices. We used my son's iPod for a school project on sound deadening. Put a speaker inside a box and used various insulation and other materials to see which was most effective to build a home music studio. Was within 1-2 dB of the AC RTA at home, but we played full range music, not 30-50 Hz, sorry Jam. Static drops are my bag. Link to comment Share on other sites More sharing options...
Bump4life Posted January 15, 2015 Report Share Posted January 15, 2015 I think the better question would be is the iphone accurate on what frequency is being played. even if it could only measure up to 100 db, that can still be very useful information. Buyer/Seller Feedback Thread: http://www.stevemead...5015-bump4life/ MB C220 153 Trunk Car Build Log: http://www.stevemead...d/#entry1840136 MB C280 Ipad Dash SQ Build Log: http://www.stevemeadedesigns.com/board/topic/194484-bump4lifes-new-benz-tony-c-relay-kit-pictures-ce-electric-audison-front-stage-installed/ My SPL Log: http://www.stevemead...__fromsearch__1 BMW M340 xDrive Stock, for now. Corner Load 10" maybe soon. But does 10s in the 1/4... Best Scores out of a trunk 153.0 sealed legal full tilt clamped 5524 @ 42 hz 154+ windows down, 155+ kick Link to comment Share on other sites More sharing options...
n8ball2013 Posted January 15, 2015 Report Share Posted January 15, 2015 I'm not about to blow out the mic on my 6 testing this 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...
Jessica Posted January 15, 2015 Report Share Posted January 15, 2015 it doesnt matter if its accurate or not cause even if it was it would be "A" weighted DB not "C" weighted which is more accurate for low freq. even a really good meter that only does "A" and "B" weighted measurement is not going to be accurate measuring low freq. Rest in peace, walled 87 accord build log 03' Corolla build with AA Mayhem inside. My super random youtube channel and terrible camera work. Wiring comparison by CaptainzPlanetz Wire and fuse guide by Guest SyKo13 Link to comment Share on other sites More sharing options...
never knows best Posted January 15, 2015 Report Share Posted January 15, 2015 could always measure the cabin and do a little math to get a rough estimate. then see if you get a similar result with the app- Link to comment Share on other sites More sharing options...
Jam Havoc Posted January 16, 2015 Author Report Share Posted January 16, 2015 Thank you guys for your feedback. Indeed it doesn't really matter how much db's I guess cause it's just to meassure the difference between the frequencies. I'm using the app called 'dB Volume' and it has a function where I can change the Weighting from A,B & C. I don't know what that means and if it has something to do with the software or hardware wether that works or not. But if you guys say it's still not accurate even though I play at low volume then I guess I can't really rely on it.. I used this box with a different sub in a different car (also small hatchback) in a competition and it gave the same peak at 33hz and 40hz on the Termlab meter, the sub was a 1200 rms kicker and I'm using a 1250rms Havoc now, they were both 15". I can try to test the app but I guess the numbers wont be reliable with all the changes. So you guys are saying the only real way to check the peak freq is to buy an expensive db meter that's c weighted? (whatever that may be haha) Thanks! Link to comment Share on other sites More sharing options...
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