Hi,

They may look the same but are different in more areas than coverage.

If you intend to use a 4" 1,5" driver for HiFi use the 6815 is clearly a better choice. It is the wave guide JBL use in the VTX12/15.

If you use the 2453 driver on the 6815 you will need a 1cm adapter between the wave guide and the driver.

Not needed for 2447, 2450SL, 2451 or 2452. You can find additional info in the forum on that. D2/2430K also works fine on the 6815, as in the VTX F12/15.

However I prefer the the 4" with an SL diaphragm on the 6815.

I have limited experience using the 243X series drivers as the 4" is about the same price used and IMHO vastly superior.

Enjoy the weekend
//Rob