No, they are different things. This would be like calculating an apple into an orange.
wire two 8 ohm speakers in a parallel circuit!
volts, amperes, ohms, hertz, watts
16 Ohms. Yes 16 ohms in series. 4 ohms in parallel
The nominal 8 inch speaker impedance can be 4 ohms, 8 ohms or 16 ohms. It depends on the make of the loudspeaker not on the 8 inches.
Positive
Mega is 8 X 10^6 and Kilo is 8000 X 10^3. For every 3 you go down in powers you divide by 1000, so 8 Mega ohms is 8,000,000 ohms. 8,000 Kilo ohms or 0.008 Giga ohms.
Use 5.2 ohms, which is the closest to 8 ohms.
For an 8 ohm speaker, 8 ohms is perfect. "Good" and "bad" are relative to the application.
Though it is tempting to say the difference is 2 ohms (8 ohms minus 2 ohms equals 6 ohms), lets look at some things. The 6 ohms is 3/4ths the resistance of the 8 ohms. If the resistances are loads, the 6 ohm load will draw 1/3rd more current than the 8 ohm load. The 8 ohm load will draw 3/4ths as much as the 6 ohm load. Those are some differences between 6 ohms and 8 ohms.
There is no amplifier with an output impedance of 8 ohms or 4 ohms on the market. All audio amplifiers really have an output impedance of less than 0.1 ohms. Scroll down to related links and look at "Amplifiers, loudspeakers and ohms"
Jan Hertz was born on July 8, 1949, in Denmark.