What, if any, consequences would this have for driving the Perspective2 vs the original version? I use the CJ Premier 12 tube monoblocks. Are there any implications as to the Perspective2s being harder to drive or whatever vs the originals (which I own)?
Hi @prof
Thanks for trusting me to answer this question.
For a solid state (i.e. low output impedance) amplifier the consequences are probably very little.
As the amp’s output impedance rises (damping factor drops) the frequency response of the amp’s output starts to tracks the impedance. So, the math says that increases in impedance will lead to increases in output. The other thing that is noticeable, and almost coincident is the phase angle is now bigger just above, ~ -45 degrees vs. ~ - 25 for the original. So long as this is coincidental with a high impedance this should not be an issue.
The Perspective 2 isn’t what is normally thought of as "hard to drive" but if you ask if the change in impedance has the opportunity to alter the sound of the amp/speaker combo then yes, it is possible that there would be more output at the impedance peak, how much and whether or not it is unpleasant is another story. :)
Both amps share quite a bumpy ride between the bass (150 Hz) to 20 kHz, but if you already like the sound of the original, I’m sure the new one won’t be much different, with potentially a stronger output at the peak.
You know, I thought I had seen specs from JA which showed the speaker to be impedance compensated. Clearly these two examples are not!
Something you did not ask about: The overall balance.
Based on the impedance, frequency and assuming JA has kept the original tweeter, it looks like he’s not trying to get the tweeter as flat to 20 kHz as before. I would expect the new model to sound a little more relaxed in the top octave.
Neither model exhibits frequency aberrations, so I just note this as a mild shift in goals.
Best,
E
