Without knowing more, I'd say that the power supply of the Linn is not up to the current demands of a low impedance loudspeaker.
While I'm sure it's musical, it's simply running out of current when pushed.
As the impedance of a loudspeaker dips below four, some high current amps just provide the current necessary, and some double their output in to half the resistance. Not so with some amps.
When considering a new amp, look for amps that double, or almost double into 4 ohms.
Good listening.
Larry Staples
While I'm sure it's musical, it's simply running out of current when pushed.
As the impedance of a loudspeaker dips below four, some high current amps just provide the current necessary, and some double their output in to half the resistance. Not so with some amps.
When considering a new amp, look for amps that double, or almost double into 4 ohms.
Good listening.
Larry Staples