Discussion in 'Amps and Cabs [BG]' started by spalka621, Jan 13, 2006.

1. spalka621

Jul 26, 2005
Sioux Falls, SD
How many watts would a amp thats rated at 180 rms, such as a Electric Blue 180 Amplifier Head, put through a 8 ohm cab.

2. ThorModeratorStaff MemberGold Supporting Member

The Ashdown manufacturer specs found online at Musicians
Friend, Same Day and zZounds all use the same PDF file.

I can't see any Ohm rating info in any of the specs available.
Just a claim of 180 watts RMS.

It does note that the minimum impedance is 4 ohms.
If the Amp produces 180 watts at 4 ohms, which is
likely, we can apply
Ohm's Law (P(ower) = I^2(Currrent) xR(esistance )
and V(oltage) = I(Current) x R(esistance)

and derive 180 = I^2 x 4 I then = 6.70 and
Voltage is 26.8 volts (V=IR).

(26.8 = Ix8) we find the new current is I = 3.35.
Then the Power of the new circuit is P = I^2 x R
or P = 11.2225 x 8 or 89.78 watts.

Note how this is not readily revealed in the specifications
somehow.

Be aware that how loud this amp is will depend on the
sensitivity of the speaker the amp is connected to.

Ohm's Law is covered in the FAQ's if you have a further interest.

3. spalka621

Jul 26, 2005
Sioux Falls, SD
okay thNKS FOR THE INFO I WAS JUST CONFUSED ABOUT WHAT RMS MEANT