Hey,

Will Harmon Kardon speakers work in an R50 with an aftermarket amplifier and headunit or do you need to get the full HK setup?

 

Mixing amplifiers and speaker brands is not a problem as long as you match impedance. An 8 ohm amplifier needs an 8 ohm speaker for instance. You will find the common impedances to be 4, 8 and 16 ohms. If you run, say, an 8 ohm output into a 4 ohm load you will over heat and eventually burn out the amplifier.

 

PS: Every piece of electronic audio equipment has the impedance clearly marked on the box and on the back of the unit. The graphic symbol for ohms is the omega, i.e. Ω

 

Quick answer...
No.
Impedance is nonstandard.

 

Y not just use aftermarket speakers also?