Impedance vs Sensitivity

[Guido]

This is posted in "technical help" although it deals with aftermarket components simply because it might be interesting for JBL components too.

Here is my prob:

I had time last weekend and an aftermarket dia for testing purpose on hand so I tweaked around with aftermarket and original dias on my 2416H (4425s).

As we all know the JBL 8 Ohm dias are 4 Ohm Dias in reality as they have a DCR of 3.2 Ohm.
My aftermarket Dia have a DCR of 4.3 Ohm and is the closest possible substitute.

What I did was:
I switched the aftermarket dia in the 2416H of one 4425 and left the other 2416H original.

What I expected was:
As the aftermarket dia have a slightly higher impedance the sensitivity of the 2416H will be slightly reduced.

What happened was:
The 2416H with the aftermarket dia had an appr. 2 dB higher midband sensitivity.

Huh??

Could this be because the aftermarket dia have a "longer" wire inside the gap and therefore a higher BxL?

Who can explain this to me?


Final Result: Don't mess around with aftermarket components!