Mike Whitenton Posted February 7, 2013 Report Share Posted February 7, 2013 The DD-1 is a well engineered piece of test equipment. If used the way Tony and Steve have described in their tutorial videos, you are not going to damage your amp. However, you cannot take the instructions from a single example video and use that procedure for every possible install. For example: A head unit line output of 2V running into an amp with a max line input of 5V will work and is idiot proof. However if you have an active EQ or line driver that can output 8 or 10V, the amp inputs can't handle that high of a line level voltage, so you need to set the line output differently. In this case, you need to set the EQ/line driver using the "through the amp method". Steve has shown this in a couple of videos. This will set the output of the EQ/line driver to the maximum safe input to the amp. Then once this is done you adjust the amp gains. If you don't do this you can feed to much line signal voltage into your amp. This could damage the amp inputs as well as make it impossible to obtain an undistorted signal at the amp outputs no matter what the gains are set at. The DD-1 is not at fault for someone not understanding their equipment and how to use the tools correctly for their install. 1 Quote Link to comment Share on other sites More sharing options...
bigmescan Posted February 7, 2013 Report Share Posted February 7, 2013 Yeah I know it's not accurate. Haha. That's just my own little "ballpark area" way of doing it. oh "ballpark" is probably ok with one amp....but imagine a DVC sub with an amp on each coil. I will take "exact" in that case. Even if they are in the same chamber....hell, even if they are not in the same chamber. Same thing for door speakers. If you have a 4 channel, its pretty important. I wouldn't want one door at 90 and the other at 225. Its easy to be THAT far off. now this i didnt know.... i reaaly need to just buy a dd1 Quote SONY XAV-701HDRF power 400.4 RF power 1000bd 3 Sundown x8's d22004 f150 single cab2 sets of components MB quart 6.5 onx (2 tweets 2 6.5 perdoor)stock batt up fronBIG 3http://www.stevemead...-vid-pg-11-922/http://www.youtube.c.../TheBigmescan74 Link to comment Share on other sites More sharing options...
TonyD'Amore Posted February 7, 2013 Report Share Posted February 7, 2013 (edited) I agree with Steve, if you have more than one amplifier in your system the CC-1 is a must. On the surface it seems like if your crossovers weren't adjusted properly it wouldn't make that much of a difference in output, only in sound quality. FALSE. Example: A DVC or 2 subwoofers on two amplifiers. Amplifiers are legit 3000 Watts per channel. Crossovers on these amps were set "by eyeball" Amplifiers have 24dB/Oct crossovers, actual crossover point set at 65Hz the other at 95Hz. (very easy to do if you are aiming for 80Hz and your knob has 30Hz at one end and 300Hz at the other) Let us also say for this example that we are trying to play a 60Hz signal to our subwoofer(s). Amplifier A - 3000 Watts, crossover set at 65Hz. When playing 60Hz the output signal is going to be 164.3 degress out of phase with the input signal Amplifier B - 3000 Watts, crossover set at 95Hz. When playing 60Hz the output signal is going to be 101.7 degrees out of phase with the input signal So the two amplifiers are 62.6 degrees out of phase with each other at 60Hz! Okay, so what does this mean? This means that your TWO 3000 Watt amplifiers ARE NOT putting out 6000 Watts TOGETHER. They are only putting out (6000 W * SIN(62.6deg)) = 5341 Watts. Want 659 Watts FOR FREE? Get a CC-1 and set your crossovers properly - Tony D Edited February 7, 2013 by TonyD'Amore 5 Quote Link to comment Share on other sites More sharing options...
Kyblack76 Posted February 7, 2013 Report Share Posted February 7, 2013 TD - epic. 4 Quote SMD SUPER SELLER The Burban Build Blazer Build sold Acura trunk build sold Link to comment Share on other sites More sharing options...
TonyD'Amore Posted February 7, 2013 Report Share Posted February 7, 2013 I should also add -- In that example both amplifers were gain matched @ 60Hz! So that is actually a best case senario. Quote Link to comment Share on other sites More sharing options...
SnowDrifter Posted February 7, 2013 Report Share Posted February 7, 2013 This is why we love you, Tony! 1 Quote ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444 Link to comment Share on other sites More sharing options...
alaskanzx5 Posted February 7, 2013 Report Share Posted February 7, 2013 (edited) great, now i need to find someone with a cc-1 to. "sigh" it just never ends with the what needed list when tony d and steve are talking. you guys do some great work, i just need to hurry up and move to the lower 48 so i can find someone i can pay to dd-1 and cc-1 my setup. Edited February 7, 2013 by alaskanzx5 1 Quote t1500bdcp 2 t2d4 15" 1 t600.4 1 t400.2 1 set p1 tweets singer alt, tons of wiring, smd vm-1, 80prs, back seat delete, still in the works, aiming for a 145-147 with the ability to play 25hz up to 50hz. Link to comment Share on other sites More sharing options...
Jay L. Posted February 7, 2013 Report Share Posted February 7, 2013 Did this particular amp buzz internally when the dd-1 detected distortion? Quote Link to comment Share on other sites More sharing options...
meade916 Posted February 7, 2013 Author Report Share Posted February 7, 2013 Did this particular amp buzz internally when the dd-1 detected distortion? nope. 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...
TonyD'Amore Posted February 7, 2013 Report Share Posted February 7, 2013 Many class D amplifiers make some buzzing type noise when the output signal is clipping, or close to clipping. I believe it is mostly the giant output inductors they all have. 2 Quote Link to comment Share on other sites More sharing options...
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