memphismanx88 Posted October 26, 2006 Report Share Posted October 26, 2006 does the THD really make a huge difference i dont really no to much about that Link to comment Share on other sites More sharing options...
andym85 Posted October 27, 2006 Report Share Posted October 27, 2006 i could be way off base here, and im sure somebody more knowledgable will chime in, but imo THD only makes a HUGE difference if you are heavily into sound quality. the lower the THD at a given ohm level, the cleaner the sound is gonna be...but i always look at when comparing amps... i likes me some audio stuff... Link to comment Share on other sites More sharing options...
Audio Doc Posted October 30, 2006 Report Share Posted October 30, 2006 - Total Harmonic Distortion - The measurment of distortion in the reproduction of the sine wave. Super laymen terms: The measurment of an amplifiers ability to reproduce a signal without unwanted noise or *coloration* of the input signal. The measurment is usually considered a final percentage of the output signal. Ie. 10% THD = 10% of the signal comming out of the amplifier is unwanted crap. Out of 100% of course. It comes in *many* forms and can be caused for many reasons (bad PS design, poor stage designs, clipping, etc) Without getting too far into it, I can just give you the stuff you need to consider. 1) The average human ear cannot detect below 3% THD on sub harmonics (lows) 2) The average human ear cannot detect below 1% THD on top end harmonics (mid or >) 3) Your speakers are likely to cause more audible distortion then your amplifier. 4) If it is still a major concern always shop using THD @ rated output. THD @ rated output is the THD rating at the amplifiers RMS output levels. Some companies like to do the ratings at MUCH lower levels creating a biased measurment for the sake of publishing beter specs. Do you listen to your stereo at MUCH lower levels? I don't think so.. At any rate most if not all current amplifier technology exceeds realistic needs in this area (yes, even pyramid amps). So it's not as important to observe as it once was. And as long as your ears are the only MIC's that are ever going to measure your system, I wouldn't be cashing in a savings bond on that McLintosh amp you've had your eyes on anytime soon. Hope this helps. May the force be with you.. - Matt FTW? Link to comment Share on other sites More sharing options...
memphismanx88 Posted October 31, 2006 Author Report Share Posted October 31, 2006 thanx alot matt Link to comment Share on other sites More sharing options...
Dale Posted November 5, 2006 Report Share Posted November 5, 2006 - Total Harmonic Distortion - The measurment of distortion in the reproduction of the sine wave. Super laymen terms: The measurment of an amplifiers ability to reproduce a signal without unwanted noise or *coloration* of the input signal. The measurment is usually considered a final percentage of the output signal. Ie. 10% THD = 10% of the signal comming out of the amplifier is unwanted crap. Out of 100% of course. It comes in *many* forms and can be caused for many reasons (bad PS design, poor stage designs, clipping, etc) Without getting too far into it, I can just give you the stuff you need to consider. 1) The average human ear cannot detect below 3% THD on sub harmonics (lows) 2) The average human ear cannot detect below 1% THD on top end harmonics (mid or >) 3) Your speakers are likely to cause more audible distortion then your amplifier. 4) If it is still a major concern always shop using THD @ rated output. THD @ rated output is the THD rating at the amplifiers RMS output levels. Some companies like to do the ratings at MUCH lower levels creating a biased measurment for the sake of publishing beter specs. Do you listen to your stereo at MUCH lower levels? I don't think so.. At any rate most if not all current amplifier technology exceeds realistic needs in this area (yes, even pyramid amps). So it's not as important to observe as it once was. And as long as your ears are the only MIC's that are ever going to measure your system, I wouldn't be cashing in a savings bond on that McLintosh amp you've had your eyes on anytime soon. Hope this helps. May the force be with you.. - Matt ^^^ X2 I only pay close attention to THD when getting equipment for the upper end of the frequency spectrum (mids and highs). But if you need an amp for subs then a slightly higher THD will be more forgiving since it is difficult to detect distortion in lower frequencies Link to comment Share on other sites More sharing options...
haswes1992 Posted May 10, 2008 Report Share Posted May 10, 2008 Say for my amp ( which is not in use at the moment ) im pretty sure it said it was 0.08%THD is that good? lol My Youtube Page.. Check It Out Link to comment Share on other sites More sharing options...
Team_Bad_Company Posted October 18, 2008 Report Share Posted October 18, 2008 I don't think remember correctly... But i think one of my Eclipse amps is like 0.0005% THD or something hella low like that. ~Team Bad Company Captain "It is the mark of intelligence to be able to entertain a thought without accepting it." Link to comment Share on other sites More sharing options...
Tek Posted July 15, 2010 Report Share Posted July 15, 2010 Where do u find the thd info for the amp? Link to comment Share on other sites More sharing options...
Southnash Posted February 24, 2011 Report Share Posted February 24, 2011 Thanks for the write-up But remember... This THD number is only useful WITHIN the same brand.. Different brands rate this in different ways (different watts) to make it seem better... The "Better" brands are more accurate in their reading, while MOST are not accurate under real world applications... Just use this number for the same brand..exp. Two Arc Audio amps, etc Link to comment Share on other sites More sharing options...
Xaborus Posted June 3, 2013 Report Share Posted June 3, 2013 All that matters with THD when setting gains on subs is that you can get to your RMS power without exceeding 1% THD. The DD-1 will help you find 1% THD why a DMM will help you measure output. Basically, set gains with DD-1 until you can go as high as you can without 1% distortion. Then use the DDM and fine tune to RMS wattage you need. Link to comment Share on other sites More sharing options...
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