Efficiency of a Fatboy Speaker

I put a speaker like this one in my 3rd Rail Niagara and I'm very pleased with the expanded bass response and output.

https://www.madisoundspeakerst...=product&id=1018

It's a 4 ohm version. It says only 85db sensitivity.

Sometimes I swear that the specs don't paint the full picture?

Efficiency is only one pole of the tent.  Frequency response and the maximum rating have to be considered as well.

gibson man posted:

Does anybody know the efficiency of a Fatboy speaker...that is...how many db at 1 watt at 1 meter?

Greater efficiency = louder for a given amount of power...

I am looking for the most efficient 2 inch speaker to get the most out of the railsounds modules err makes...so far, 88db is the best I have seen...in a DROK-branded speaker...

I think the only way to find the actual figure out is by setting up a test fixture which would require a calibrated mike and preferably an anechoic chamber. Alternatively you could compare the Fatboy to another speaker which has a known efficiency. There are apps with meters so you can compare relative sound levels on your computer, smart phone, or tablet.

I have the equipment to determine Thiele-Small parameters which are useful in designing ideal enclosures and even did a few toy train speakers before Lionel offered their Fatboys. Digital Dynamics Mega Bass was the king back then. Future testing will have to wait until the weather turns bad and I have nothing else to do. Not likely in the near future.

Pete