The power output of a low output impedance amplifier (such as a low negative feedback tube amp) will be affected by the speaker's impedance curve as follows: Where the speaker's impedance rises the amp will put out more power, and where the speaker's impedance dips the amp will put out less power. So the net speaker + amp frequency response is modulated by the speaker's impedance curve.
More often than not, such modulation of the frequency response is undesirable. However, with the deCapo, the frequency response zigs where the impedance curve zags, so that the interaction with a low output impedance tube amp partially fills in a midrange dip and also extends the bass deeper than it otherwise would have gone.
Tubes would definitely be my choice for this speaker. If you don't want to deal with tubes, look into First Watt, which is Nelson Pass' company that specializes in low power high output impedance solid state amps.
Duke
More often than not, such modulation of the frequency response is undesirable. However, with the deCapo, the frequency response zigs where the impedance curve zags, so that the interaction with a low output impedance tube amp partially fills in a midrange dip and also extends the bass deeper than it otherwise would have gone.
Tubes would definitely be my choice for this speaker. If you don't want to deal with tubes, look into First Watt, which is Nelson Pass' company that specializes in low power high output impedance solid state amps.
Duke