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Old 25th April 2010, 03:27 PM   #1
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Default some doubts about technical terms used with speakers.

plz clarify my doubts abou following:
1) what is mean by THD
2) what is mean by signal to noise ratio
3)Alteclansing(fx5051) have a Signal to Noise Ratio of @ 1 kHz input: > 75 dB and Edifier have >85DBA which one is good?
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Old 25th April 2010, 04:07 PM   #2
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Total Harmonic Distortion is a measure of how much inaccuracy an amplifier introduces into a signal. Smaller number is better.

All electronic circuits suffer from internally generated noise. This is audible as hiss in an audio amplifier in some cases, particularly if the volume is turned up and there is no signal. Signal to noise ratio tells you how much hiss to music there is regardless of volume setting, so it's a measure of amplifier quality usually expressed in dBs, the bigger the number the better.

You cannot compare dBs and dBAs

w

These are very basic explanations, you could probably have worked it all out for yourself with a bit of googling.
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Old 25th April 2010, 05:05 PM   #3
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Quote:
Originally Posted by knairkuttan View Post
1) what is mean by THD
To expand what wakibaki says.

THD is a "sum" that collapes the spectrum of harmonic distortion into a single number.

The only scientific studies extant (Geddes) indicate that this single number has little correlation to sonics unless it gets quite large.

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Old 25th April 2010, 07:00 PM   #4
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Quote:
Originally Posted by knairkuttan View Post
plz clarify my doubts abou following:
1) what is mean by THD
2) what is mean by signal to noise ratio
3)Alteclansing(fx5051) have a Signal to Noise Ratio of @ 1 kHz input: > 75 dB and Edifier have >85DBA which one is good?
SNR is one of those specs that's often used to attract consumers, as a "more is better" thing regardless of whether or not it'll actually be noticeable. I wouldn't use it solely to make a decision, unless one of them is broken
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Old 5th May 2010, 12:29 PM   #5
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thanks
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Old 5th May 2010, 07:39 PM   #6
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Be ware of numbers with weighting. Like dBA. Well especially with A weighting as it hides even huge amounts of 50Hz noise, 30dB in fact relative to 1kHz.
See Ponderaciones A, B y C / A, B and C weightings < Referencias de Audio Profesional / Pro Audio Reference
Google seems to report it as malicious content for me at the moment though.
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