I'm trying to learn how this is all done so I'm confused on two points. First how do you know how much DB you need in a room to begin with to achieve a certain "feel"? Secondly if the long term peak of a speaker (assuming that's RMS) is 600 watts then wouldn't you need an amp that is slightly over 600 watts to run it at its full potential? I'm confused as to why one would use an underpowered amplifier to run a speaker. Like I said I'm new to learning about this, I'm sure there's lots of things I don't understand and I'm prepared to learn. Thanks.
You are right ,,,but always note:-we get +3db every time when we double the power of amp ex:- if we have a speaker with 100db sensitivity(at 1m and 1w) and 600w power Then we double the power (1w) until it matches 600w That is 2^9.23=600 Therefore ,max- spl=100+(9.23)*3=128db And if we need 123 db max spl Then ,power need =2^((123-100)/3)=200w And we can use amp slightly over 200,bcz power amp looses their volume/power with time In actual life ,using power 600w and above is recommended ,if you donot overdrive spekers ,,,and in 600w amp you can control spl/power of amp from 0 to 600w with volume knob And you can calculate spl needed by dbmeter
Crest factor = headroom. CF = 10dB is the most common for live sound for balance between $ and quaility
I'm trying to learn how this is all done so I'm confused on two points. First how do you know how much DB you need in a room to begin with to achieve a certain "feel"? Secondly if the long term peak of a speaker (assuming that's RMS) is 600 watts then wouldn't you need an amp that is slightly over 600 watts to run it at its full potential? I'm confused as to why one would use an underpowered amplifier to run a speaker. Like I said I'm new to learning about this, I'm sure there's lots of things I don't understand and I'm prepared to learn. Thanks.
You are right ,,,but always note:-we get +3db every time when we double the power of amp
ex:- if we have a speaker with 100db sensitivity(at 1m and 1w) and 600w power
Then we double the power (1w) until it matches 600w
That is 2^9.23=600
Therefore ,max- spl=100+(9.23)*3=128db
And if we need 123 db max spl
Then ,power need =2^((123-100)/3)=200w
And we can use amp slightly over 200,bcz power amp looses their volume/power with time
In actual life ,using power 600w and above is recommended ,if you donot overdrive spekers ,,,and in 600w amp you can control spl/power of amp from 0 to 600w with volume knob
And you can calculate spl needed by dbmeter
can you explain why dBW = total SPL criteria - loudspeaker sens?
What if we used 2 speakers of jbl? So we need a 400w amplifier right?
find some information about Ohms ,, you will be fine.
Does the lecturer know the purpose of rms figures?
How can I contact you ?
Next step. Measeunt with a real loudpeaker in a real space al that distance...
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