+1 re trying different tubes in the amp. Also, what amp is it, and have you tried all of its output taps?
I suspect that the impedance of the speaker, which I presume is made by Cambridge Audio, rises significantly in the upper treble region compared to what it is at mid and low frequencies. If so, an output tap designated for higher load impedances is likely to result in a brighter presentation than a tap designated for lower impedances, to a degree that is dependent on the output impedance of the particular amp as well as on the degree of the speaker’s high frequency impedance rise.
If you already haven’t taken steps to optimize the amp/speaker impedance match, IMO doing so is likely to make far more of a difference than changing cables. As is some experimentation with different tubes.
Regards,
-- Al
I suspect that the impedance of the speaker, which I presume is made by Cambridge Audio, rises significantly in the upper treble region compared to what it is at mid and low frequencies. If so, an output tap designated for higher load impedances is likely to result in a brighter presentation than a tap designated for lower impedances, to a degree that is dependent on the output impedance of the particular amp as well as on the degree of the speaker’s high frequency impedance rise.
If you already haven’t taken steps to optimize the amp/speaker impedance match, IMO doing so is likely to make far more of a difference than changing cables. As is some experimentation with different tubes.
Regards,
-- Al