audiofanaticz Posted November 15, 2011 Report Share Posted November 15, 2011 This is awesome!! Quote Link to comment Share on other sites More sharing options...
Ric Thornton Posted November 15, 2011 Report Share Posted November 15, 2011 good stuff bro! its a fantastic device for sure! Quote Link to comment Share on other sites More sharing options...
DTS909 Posted November 15, 2011 Report Share Posted November 15, 2011 one more reason why I want one. Quote VM-1 Pioneer DEH-80PRS Hertz HSK 165XL Arc Audio KS 300.2 Linear Power 1002 Full Mods Fi Audio Q 10s Sundown Audio Scv 3000 Big 3 XS Power D5100 Juice Box 20AH Singer Alternator Sky High Wire <p>My Ebay feedback. http://feedback.ebay...tab=AllFeedback Link to comment Share on other sites More sharing options...
larrys95civic Posted November 15, 2011 Report Share Posted November 15, 2011 thats freakin cool man, Quote Team Superior SPL Former Installer at Driven Sound & Security http://www.drivenss.com All kinds of forsale threads http://www.stevemeadedesigns.com/board/topic/164247-amps-subs-and-misc/#entry2383262 http://www.stevemeadedesigns.com/board/topic/164430-polk-audio-sda6000-sound-bar/#entry2386634 http://www.stevemeadedesigns.com/board/topic/164279-3-michael-kors-watches/#entry2383983 http://www.stevemeadedesigns.com/board/topic/164549-more-items-from-storage/ http://www.stevemeadedesigns.com/board/topic/166967-dd-9518s-amps-kenwood-custom-explorer-dash/ If someone is feeling generous I'd love an original sig LOL Link to comment Share on other sites More sharing options...
meade916 Posted November 16, 2011 Author Report Share Posted November 16, 2011 a follow up from JL from the facebook post/thread. JL Audio OK…the long and short of how our nine-step method came to be may shed some light on the questions on how we compensate for different impedance loads. First, the “best” way to set levels would be with an oscilloscope. However, in reality we realize that most shops either don’t own one or if they do, they may not know the best way to use one. We looked for an easier method that did not involve expensive / elaborate equipment. The logic was that EVERY shop could be expected to have a digital voltmeter and have access to a CD with test tones. In order to make these very basic tools work, a number of assumptions needed to be made. And you know what they say about assumptions…. One assumption is that the source unit does not clip at 75% of full volume. This is not always the case, but it is USUALLY the case. Another assumption made has to do with how we calculate our target voltages. Using Joule’s Law, we know that power is equal to voltage squared divided by resistance. By reworking that basic formula, you can determine that voltage is equal to the square root of power multiplied by resistance. Example #1: Let’s say we have 31.6 volts and a 2-ohm load. Using the first formula, 31.6 times 31.6 give you 998.56 (voltage squared). Take that number and divide it by 2 (resistance) and you get 499.28…which we can easily call “500 watts”. Example #2: You have 750 watts and a 4-ohm load. Using the reworked formula, 750 multiplied by 4 gives you 3000 (power times resistance). Take the square root of 3000 and you get 54.77 volts. So the target voltage in this second example would be 54.8 volts. But herein lies the tricky part…that word: “resistance”. Resistance is used for DC applications, but music and audio amplifiers are AC. When you model up a speaker you can often look at the impedance graph and you will see how the impedance will have peak(s) and valley(s). Without getting TOO deep on this, by using the “nominal impedance”; such as “2-ohm” or “4-ohm”, we are taking an educated guess for our calculations. In practice, every amplifier has a maximum output voltage, determined by clipping and a maximum output current (another aspect of Joule’s Law is that power is equal to voltage times current…) which is determined by protection circuits, fuses or explosions. So, when using our method, we are seeking to set the voltage according to an admittedly compromised situation based upon assumptions (but not blindly…). The DD-1 is finding the voltage limit of the amplifier. In both cases, the speaker that is connected will “fill in the blank” with regard to the CURRENT and therefore determine the power. If you read all that carefully you will notice that your speaker is RARELY if EVER getting every single Watt you might be expecting. But what you can expect is that when your music asks for your amplifier to produce maximum power to the speaker connected, it will do so with MINIMAL clipping (as determined by the overlap; about 10dB or so in our method or the various levels that the DD-1 allows for). Speakers typically don’t die after short bursts of ‘butt-loads” of power (technical term….)….they typically die after longer lasting events of excessive power; and those events are most often a result of improperly set levels. This is why we strongly support using our nine-step method, the DD-1 or an oscilloscope (there are a couple of other cool methods too). This is a heck of a lot better than “by ear” or arbitrarily setting things at “half way” or something like that… -st Quote All SMD products + MORE available at my store here! https://wccaraudio.com/ Subscribe to My Youtube Channel! Over 1,000,000 subscribers strong! Turn on your notifications! http://www.youtube.com/meade916 Follow My Instagram! Daily live feeds from the shop, exclusive content way before it hits my Youtube channel...and little squares with photo's in them http://www.instagram.com/meade916 The Official SMD Facebook fan Page https://www.facebook.com/SteveMeadeDesigns/ Follow my Tweet (Twitter) http://www.Twitter.com/meade916 Link to comment Share on other sites More sharing options...
Q-Bert Posted November 16, 2011 Report Share Posted November 16, 2011 Maybe I can convince my boss to buy DD-1's for his other shops now that a respected manufacturer has backed the tool. He refuses to believe that the DD-1 does what it say's even after I sent him numerous YouTube videos and a demo of using it in my vehicle. He still thinks his ear is just as good even after proving him wrong. Quote 2006 Chevy Cobalt SS Headunit: Eclipse 8445 (sold) Highs Amp: Eclipse 3620 (sold) Sub Amp: Eclipse 3122 (sold) Front stage: Memphis M class6.5 components (2007) Sub: 1 Memphis M class 12" (sold) SPL TermLab 130.7 (windshield) (selling) Car Audio & Alarm installer for 16 years. Pray for my daughter Katrina please! Link to comment Share on other sites More sharing options...
meade916 Posted November 16, 2011 Author Report Share Posted November 16, 2011 Maybe I can convince my boss to buy DD-1's for his other shops now that a respected manufacturer has backed the tool. He refuses to believe that the DD-1 does what it say's even after I sent him numerous YouTube videos and a demo of using it in my vehicle. He still thinks his ear is just as good even after proving him wrong. to be honest, if your boss doesn't at least use an o-scope, he probably shouldn't be the boss. At least not an "installer" boss. Maybe he should stick to paperwork Quote All SMD products + MORE available at my store here! https://wccaraudio.com/ Subscribe to My Youtube Channel! Over 1,000,000 subscribers strong! Turn on your notifications! http://www.youtube.com/meade916 Follow My Instagram! Daily live feeds from the shop, exclusive content way before it hits my Youtube channel...and little squares with photo's in them http://www.instagram.com/meade916 The Official SMD Facebook fan Page https://www.facebook.com/SteveMeadeDesigns/ Follow my Tweet (Twitter) http://www.Twitter.com/meade916 Link to comment Share on other sites More sharing options...
JEMT8 Posted November 16, 2011 Report Share Posted November 16, 2011 I know what i am getting for Christmas Quote formerly known as Jaylor Swift Link to comment Share on other sites More sharing options...
VIPmeetSPL Posted November 16, 2011 Report Share Posted November 16, 2011 If JL saisld it was cool then am getting one lol jk. JL has nothing to do.with my decision just still saving up and.then bam I will rule the world....(don't ask) Quote Link to comment Share on other sites More sharing options...
VIPmeetSPL Posted November 16, 2011 Report Share Posted November 16, 2011 Hey Steve did you set your Tahoe with a dd1 was there any difference than when you set it.with an.o scope? Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.