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  1. #1

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    Default What to Buy to measure Freq Response, Decibels & response curve ?

    Hello,

    What should I buy to measure Frequency of my Subwoofer in my car and also I'd like to know the decibels output.

    Do I need two devices or are there ones that will do both in one unit?

    I think this unit just measure decibels?

    http://www.amazon.com/Extech-407730-...HZNFM3NJJ2EP7A

    Somebody on the Nissan Leaf forum asked me this:

    "To start with - analytically - how flat is your response curve and to what Hz at the low end ? If you haven't checked, get hold of a stereophile cd & a simple dsl meter from ratshack and try it out. You will be surprised."

    http://www.mynissanleaf.com/viewtopi...art=20#p362156

    I'm not sure how to measure these items,

    Thanks,

    Sal
    Polk Audio SDA SRS 1.2TL's
    With new Exotic wood, Sonicaps, Mills & RDO198's - Born on 4-24-1989 and Signed by Matthew Polk!!!!


    My Polk SDA SRS 1.2TL's http://www.LASAREATH.com/


    It All Started here: http://tinyurl.com/lasareath2

    Part Deux: http://tinyurl.com/lasareath3

    Car Stereo---->http://www.salsleaf.com/leaf_stereo/index.htm<---- NEW for 2013

  2. #2

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    I believe you can get these as Apps for an i device if you have one.
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  3. #3

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    Isn't the problem with SPL meters that they won't give you a specific reading at a specific frequency? In other words it will tell you how many Dbs the sub puts out but not how much at 30hz or 20hz, etc. As you know dbs fall off very fast below 30-40hz or so and you need FANTASTIC amounts of POWER to get over 100 db at 20hz or below.

    There probably are some apps as z77 suggests. I'm not an iphone guy so I don't do Apps. lol

    cnh
    Last edited by cnh; 04-13-2014 at 04:00 PM.
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  4. #4

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    You can also get an app that sends out a specific frequency, seems like there are apps for everything.
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    Radio Shack has a SPL meter that works pretty well. You can buy test tone CD's of filtered pink noise at 1/3 octave frequencies as well. As for response curves, the ones you can get for your phone aren't that good because the microphone in your phone isn't meant to be super accurate 20-20 KHz so you're not gonna get a really spot on measurement. If you buy an actual measuring mic from like Parts Express and use a program on your laptop, you can get a pretty accurate measurement. Or you could go all out and buy a $1500 Audiocontrol RTA and have a dead on balls plot.

    There is a mic you can get from Parts Express that fits in the headphone jack of your phone that has a calibration file you can use with Audio Tool but I'm not convinced it's that accurate either. So basically it's around $100 for a real mic, $30 for TrueRTA and a laptop.
    polkaudio sound quality competitor since 2005
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    Thanks. I don't the trust the iPhone apps because I've tried recording music with extreme bass (I have extreme bass in my car) and it sounds like crap. mainly because the iphone mic is crap.

    I can assure you that the bass and sound did not sound so crappy like this sounds in this video.




    So, If it can't record it correctly then how can it measure it correctly?
    Polk Audio SDA SRS 1.2TL's
    With new Exotic wood, Sonicaps, Mills & RDO198's - Born on 4-24-1989 and Signed by Matthew Polk!!!!


    My Polk SDA SRS 1.2TL's http://www.LASAREATH.com/


    It All Started here: http://tinyurl.com/lasareath2

    Part Deux: http://tinyurl.com/lasareath3

    Car Stereo---->http://www.salsleaf.com/leaf_stereo/index.htm<---- NEW for 2013

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    http://www.audiocontrol.com/t37/1012...-analyzer.html

    Not cheap but eh...it's deadly accurate.
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  8. #8

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    Thanks, looking around I see them for $400 to $500


    Quote Originally Posted by nbrowser View Post
    http://www.audiocontrol.com/t37/1012...-analyzer.html

    Not cheap but eh...it's deadly accurate.
    Polk Audio SDA SRS 1.2TL's
    With new Exotic wood, Sonicaps, Mills & RDO198's - Born on 4-24-1989 and Signed by Matthew Polk!!!!


    My Polk SDA SRS 1.2TL's http://www.LASAREATH.com/


    It All Started here: http://tinyurl.com/lasareath2

    Part Deux: http://tinyurl.com/lasareath3

    Car Stereo---->http://www.salsleaf.com/leaf_stereo/index.htm<---- NEW for 2013

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    That SA-3052 (it's actually one of the better ones out there) will do everything you ask, Sal but, like what was said, it's not cheap.

    Similar meters are used in actual competition too.

    If you are looking to get a general idea of how your stuff is performing, the mentioned apps will be fine.

    If you're going to try your hand at competing, find out what measuring devices are used by the sanctioning body you are going to be competing under. Then either find one you can borrow or buy one of your own. Have it calibrated to the same standards and use that to tune your set up.
    You're just jealous 'cause the voices don't talk to you!

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    Default

    Quote Originally Posted by Lasareath View Post
    Thanks, looking around I see them for $400 to $500
    That's not too bad, especially if the mic comes with it. I remember my old IASCA competition days...miss my basic system whup more expensive systems...
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  11. #11

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    Default

    Thanks John for that info!


    Quote Originally Posted by Jstas View Post
    That SA-3052 (it's actually one of the better ones out there) will do everything you ask, Sal but, like what was said, it's not cheap.

    Similar meters are used in actual competition too.

    If you are looking to get a general idea of how your stuff is performing, the mentioned apps will be fine.

    If you're going to try your hand at competing, find out what measuring devices are used by the sanctioning body you are going to be competing under. Then either find one you can borrow or buy one of your own. Have it calibrated to the same standards and use that to tune your set up.
    Polk Audio SDA SRS 1.2TL's
    With new Exotic wood, Sonicaps, Mills & RDO198's - Born on 4-24-1989 and Signed by Matthew Polk!!!!


    My Polk SDA SRS 1.2TL's http://www.LASAREATH.com/


    It All Started here: http://tinyurl.com/lasareath2

    Part Deux: http://tinyurl.com/lasareath3

    Car Stereo---->http://www.salsleaf.com/leaf_stereo/index.htm<---- NEW for 2013

  12. #12

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    This one looks pretty good for my current needs: http://www.audiocontrol.com/t37/6229...icrophone.html

    It replaces the cheap internal iPhone mic
    Polk Audio SDA SRS 1.2TL's
    With new Exotic wood, Sonicaps, Mills & RDO198's - Born on 4-24-1989 and Signed by Matthew Polk!!!!


    My Polk SDA SRS 1.2TL's http://www.LASAREATH.com/


    It All Started here: http://tinyurl.com/lasareath2

    Part Deux: http://tinyurl.com/lasareath3

    Car Stereo---->http://www.salsleaf.com/leaf_stereo/index.htm<---- NEW for 2013

  13. #13

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    Wish they made cool stuff like that for Android. Don't get why they dont.
    polkaudio sound quality competitor since 2005
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    08 Car Audio Nationals 1st ~ 07 N Georgia Nationals 1st ~ 06 Carl Casper Nationals 1st ~ USACi 05 Southeast AutumnFest 1st

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  14. #14

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    John, I just bought this unit:

    Name:  AC_RTA_3050A.jpg
Views: 77
Size:  74.6 KB

    I just need to figure out how to generate the Pink noise through my system. Either by playing a CD, MP3 or Hooking up a Pink Noise Generator.

    What would you use?






    Quote Originally Posted by Jstas View Post
    That SA-3052 (it's actually one of the better ones out there) will do everything you ask, Sal but, like what was said, it's not cheap.

    Similar meters are used in actual competition too.

    If you are looking to get a general idea of how your stuff is performing, the mentioned apps will be fine.

    If you're going to try your hand at competing, find out what measuring devices are used by the sanctioning body you are going to be competing under. Then either find one you can borrow or buy one of your own. Have it calibrated to the same standards and use that to tune your set up.
    Polk Audio SDA SRS 1.2TL's
    With new Exotic wood, Sonicaps, Mills & RDO198's - Born on 4-24-1989 and Signed by Matthew Polk!!!!


    My Polk SDA SRS 1.2TL's http://www.LASAREATH.com/


    It All Started here: http://tinyurl.com/lasareath2

    Part Deux: http://tinyurl.com/lasareath3

    Car Stereo---->http://www.salsleaf.com/leaf_stereo/index.htm<---- NEW for 2013

  15. #15
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    Hello,
    That unit should have a built-in pink noise generator on the right side of the front panel. You'll need a 1/4" phone plug on one end of a cable and an RCA to go into your preamp. You'll need some microphone cable to be able to locate the microphone where you want.
    Ken
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  16. #16

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    Oh, Ok Cool. Thanks Ken.

    I thought I would be able to finally use my 3 completely sealed Stereophile Test CDs that I bought years ago?


    Quote Originally Posted by Kenneth Swauger View Post
    Hello,
    That unit should have a built-in pink noise generator on the right side of the front panel. You'll need a 1/4" phone plug on one end of a cable and an RCA to go into your preamp. You'll need some microphone cable to be able to locate the microphone where you want.
    Ken
    Polk Audio SDA SRS 1.2TL's
    With new Exotic wood, Sonicaps, Mills & RDO198's - Born on 4-24-1989 and Signed by Matthew Polk!!!!


    My Polk SDA SRS 1.2TL's http://www.LASAREATH.com/


    It All Started here: http://tinyurl.com/lasareath2

    Part Deux: http://tinyurl.com/lasareath3

    Car Stereo---->http://www.salsleaf.com/leaf_stereo/index.htm<---- NEW for 2013

  17. #17

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    I have a couple of problems, my "pre-amp" has only line level inputs and they are used up and the amps only have one input each.

    http://www.crutchfield.com/p_161LC2I...1175065&awdv=c

    I have a stock HU BUT I do have an 1/8" stereo input!!! Maybe I can hookup the 1/4" Pink Noise output to that 1/8" Stereo input?

    My Home Stereo has many inputs so no issues there.
    Polk Audio SDA SRS 1.2TL's
    With new Exotic wood, Sonicaps, Mills & RDO198's - Born on 4-24-1989 and Signed by Matthew Polk!!!!


    My Polk SDA SRS 1.2TL's http://www.LASAREATH.com/


    It All Started here: http://tinyurl.com/lasareath2

    Part Deux: http://tinyurl.com/lasareath3

    Car Stereo---->http://www.salsleaf.com/leaf_stereo/index.htm<---- NEW for 2013

  18. #18
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    That shouldn't be a problem converting a 1/4" output to an 1/8" input, any audio shop should have that. You'll also need some kind of "Y" connector to get the signal to both channels. That could be the tricky part, converting a single channel 1/4" connection to a dual channel 1/8" input, but a well stocked cable shop should have something.
    The CD with pink noise is also a possibility and might be easier in a car.
    Recent bumpersticker: "Before you criticize someone walk a mile in his shoes. That way if he gets angry he'll be a mile behind you - and shoeless!"

  19. #19

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    Sal, what Ken said is probably your best way to go. But if you get stymied, the Stereophile test CDs should have pink noise and test tones on them.

    If not, you can download and burn your own copy of pink noice:

    http://www.audiocheck.net/testtones_pinknoise.php

    https://archive.org/details/TenMinut...dBrownianNoise

    http://realtraps.com/test-cd.htm

    All of those have test tones on them as well. just download the package and burn to a CD.

    If you want a generator for your phone, here:

    Android:
    https://play.google.com/store/apps/d...t.net.noisegen

    Mac:
    https://itunes.apple.com/us/app/tone...396062821?mt=8
    You're just jealous 'cause the voices don't talk to you!

  20. #20

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  21. #21

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    Quote Originally Posted by Face View Post

    I don't see how that setup is going to outperform what he just got. Especially if he got it for $205. I mean, to get a spectrum analyzer new, a cheap one starts out at like $500-$700. But the average Audio Control analyzer will run you a grand to $1500.

    Like this one:
    http://www.fullcompass.com/product/2...GGAlnJsDvD_BwE

    More info: http://www.audiocontrol.com/t34/5252...-Analyzer.html

    So if he pulled off a used one for $205 that's in good shape, even if it needs to be calibrated, he won't spend half of what it was new.

    Also, the SA-3050a has like "Hall of Fame" status in virtually every sanctioning body that does the auto sound competitions. I've seen more of them around at various shows and competitions than any other brand. Mainly because for a meter with an o-scope like that that isn't purpose designed, you're looking at at least $2K and it's not going to have the audio specific features and integration the Audio Control has.

    That analyzer will be able to use damn near any mic on the market, too, and can generate it's own programming to run as a source for not just calibrating audio equipment of any kind but for testing it as well. I don't see the laptop/fancy mic job covering all of that without some fancy sound card and a whole bunch of adapters. I also don't see it being quite as accurate/sensitive.
    You're just jealous 'cause the voices don't talk to you!

  22. #22

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    No fancy sound card or adapters needed. He can play the test tone CD in his CD player or rip the tracks off the CD to his phone or whatever he's using as a source.

    As far as it's accuracy, it's been used to design some pretty well known(and expensive) speakers.

    Unless Sal is competing in SPL competitions and needs the extra headroom, this unit is more than fine.
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche

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    I'm not convinced.
    You're just jealous 'cause the voices don't talk to you!

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    Thanks Face but I already own this one and I got it at such a great price. The seller was pretty pissed that it sold for so cheap. All the other auctions were for $350 to $500

    Just the microphone new goes for $145
    Polk Audio SDA SRS 1.2TL's
    With new Exotic wood, Sonicaps, Mills & RDO198's - Born on 4-24-1989 and Signed by Matthew Polk!!!!


    My Polk SDA SRS 1.2TL's http://www.LASAREATH.com/


    It All Started here: http://tinyurl.com/lasareath2

    Part Deux: http://tinyurl.com/lasareath3

    Car Stereo---->http://www.salsleaf.com/leaf_stereo/index.htm<---- NEW for 2013

  25. #25

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    Thanks John!



    Quote Originally Posted by Jstas View Post
    Sal, what Ken said is probably your best way to go. But if you get stymied, the Stereophile test CDs should have pink noise and test tones on them.

    If not, you can download and burn your own copy of pink noice:

    http://www.audiocheck.net/testtones_pinknoise.php

    https://archive.org/details/TenMinut...dBrownianNoise

    http://realtraps.com/test-cd.htm

    All of those have test tones on them as well. just download the package and burn to a CD.

    If you want a generator for your phone, here:

    Android:
    https://play.google.com/store/apps/d...t.net.noisegen

    Mac:
    https://itunes.apple.com/us/app/tone...396062821?mt=8
    Polk Audio SDA SRS 1.2TL's
    With new Exotic wood, Sonicaps, Mills & RDO198's - Born on 4-24-1989 and Signed by Matthew Polk!!!!


    My Polk SDA SRS 1.2TL's http://www.LASAREATH.com/


    It All Started here: http://tinyurl.com/lasareath2

    Part Deux: http://tinyurl.com/lasareath3

    Car Stereo---->http://www.salsleaf.com/leaf_stereo/index.htm<---- NEW for 2013

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    let us know how this goes!
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