comparison between volume and power

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#5
You need to find out how sensitive your speaker system is.

Build it without an amplifier to start with. I'm at work at the moment so I don't have the exact figures in front of me. Most speakers are quoted at a dB level at 1m when fed with a signal of 2.83V RMS.

So, if you feed it with a signal of 2.83V RMS and get 88 dB of sound, your speaker will have a sensitivity of 88 dB/W at 1m.

Once you have this figure you can then ascertain how much power you need to obtain the volume that you looking for.
 
#7
KatieandDad said:
You need to find out how sensitive your speaker system is.

Build it without an amplifier to start with. I'm at work at the moment so I don't have the exact figures in front of me. Most speakers are quoted at a dB level at 1m when fed with a signal of 2.83V RMS.

So, if you feed it with a signal of 2.83V RMS and get 88 dB of sound, your speaker will have a sensitivity of 88 dB/W at 1m.

Once you have this figure you can then ascertain how much power you need to obtain the volume that you looking for.
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I like to add 1 thing here, this only holds true for an 8 Ohm driver. Usually sensitivity is spec'd xdB/W @1m. Important is whether this is into half space or full space. And don't forget to take power compression into consideration.
 
#8
okay now lets say i have a 18'' sub cabinet that is about 160 litres, what power do i need in this case?
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You cannot have too much power 🙂. An amp with more power has better damping factor, so it will sound better even if you don't use all power. A bigger amp will have better power supply, helping out in transients at lower power levels. Also a big amp will not clip. Clipping is very bad for you drivers.
 
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