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I am presently comparing JR149 - one with a Monacor 135TC and another with original B110 a SP1033 type.

The Monacor has been wired for 15 ohm using both of its available voice coils.

Firstly this is a very easy conversion, the only requirement being to use 4 of the self tapper type screws rather than the threaded types. With JR149 two of the screws
are the threaded and two are the self tappers. Speaker drivers fit perfectly. Soldering is easy, I just arranged a link for the two coils of the Monacor to be in series using insulated wire

Now to the sound: The Monacor 135 TC using both coils at 15 ohm has pretty well identical output to the 7.3 ohm Kef B110 SP1033 , you would be very hard pressed to say
one speaker was louder than the other. Which is the better speaker ?. The Monacor shows itself to be the superior speaker... but its close. You seem to get more
information about the music from the Monacor, The deep bass ( not that 149's do very low bass ) is pretty well identical.

So the Monacor 135 TC wired for 15 ohms is more than a viable alternative for the Kef B110 in a JR149, it is highly recommended ..as an improvement.