@st7677
image dynamics idq12v2-website says 90.2,calculations shows87.4db
image dynamics idq15v2-website says94.2,calculations shows91.2
in my opinion both the readings are correct.sensitivity is simply a spec that tells us how loud a speaker will play given a standard amount of amplifier power.the industry standard is to present an 8 ohm speaker with a 1 watt(2.83) input signal and measure it output in an ANECHOIC CHAMBER with a microphone at a distance of 1 meter.these chambers are specially designed room which completely absorbs sound.BUT some companies gives us IN ROOM measurements.if we measure the same speaker in a room,then the boundaries(walls,floors,cieling) increases the output by 3db thus a lodspeaker which measured 89db in anechoic chamber will measure 92 db in room.this is what i think is ROOM GAIN.
ofcource what b&t bhai said is absolutely true.we will have to subtract 3 db if the impedance increases from 8 to 4 ohms.
i personally think that 90.2 db is the in room measurement and 87.4 is what it produces in chamber.it may be possible that HERTZ 93db rating is what it does in practical aplications though in any a ways is not the correct figure to disclose.
just my opinion.please correct me if i am wrong bcoz i am here only to LEARN. |