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Originally Posted by navin Look at Qms. Also I suspect that the BL and Mms numbers of the IDMax will be higher (than those of the IDQ) but the BL/Mms ratio of the IDmax will be lower than the IDQ.
my guess is that in a ported box the IDq will play louder than the IDmax while the IDmax will suit a sealed box more.
BTW you will not need the full 500W to push the IDQ (in ported box) to it's limit though. It is not the ammount of power you use but the highest clean/transient perfect SPL one can achieve that is important. |
Navin Ji I agree with you 100 % one does not need so much power to play music. SPL is another story. I was just comparing the two at same power level.
BL -> The magnetic strength of the motor structure. "Expressed in Tesla meters, this is a measurement of the motor strength of a speaker. Think of this as how good a weightlifter the transducer is. A measured mass is applied to the cone forcing it back while the current required for the motor to force the mass back is measured. The formula is mass in grams divided by the current in amperes. A high BL figure indicates a very strong transducer that moves the cone with authority!"
Mms ->The driver's effective mechanical mass (including air load), in kg. "This parameter is the combination of the weight of the cone assembly plus the ‘driver radiation mass load’. The weight of the cone assembly is easy: it’s just the sum of the weight of the cone assembly components. The driver radiation mass load is the confusing part. In simple terminology, it is the weight of the air (the amount calculated in Vd) that the cone will have to push." Car Audio: Thiele-Small Parameters |