Quote:
Originally Posted by longjaw
Sorry but you're definitely wrong with that dB info - a 3dB increase in speaker efficiency is the equivalent of doubling the amps power in term of volume - a 50 watt amp with a 100dB speaker is as loud as 100 watt amp with a 97dB speaker.
I've got two G12-75's (which are around 97 dB) in my Marshall cab at the min and my 18 watt head doesn't cut it when gigging but when I'm using my 1 x 12" with a Celestion Sidewinder in (one of the most efficient Celestion speakers ever built I believe, at around 103dB) any louder than 6 on the volume and I get told to turn it down!  |
No I'm sorry, I'm definitley right about this.
Well, we're both correct execpt we're talking about different things; volume and power.
You are correct about +3dB approximatley equating to a doubling of the amps power, but double the amps power does equal to doubling the volume.
dBs refer to releative volume or "preceived loudness", and that is what my point and the discussion in general was about.
+10 is equivalent to twice the volume. +3dB is roughly equivalent to the volume increase by doubling the amps output power.
A 100 Watt amp is not twice as loud as a 50 Watt.