Post by leonski on May 25, 2018 1:54:00 GMT -5
emotivalounge.proboards.com/thread/52178/fs-spring-cleaning-casa-boom
The one fly in the ointment is they ARE fairly low sensitivity. But at Maggie HQ in White Bear Lake, the lobby system is 30 or 35 TUBE watts per speaker.
Measured data from the MG1.6qr, made for at least a decade without major change and superceeded by the MG1.7i which gets terrific press.
www.stereophile.com/content/magnepan-magneplanar-mg16qr-loudspeaker-measurements
The factors in 'difficulty' to drive, particularly for Tube gear is how BIG the impedance swing is and over what frequency range. And secondly, a bit of information which speaker manufacturers
do NOT disclose, which is PHASE data. How Capacitive or Inductive the speaker looks at any particular frequency. Couple a LARGE phase angle (say 60 degrees) with a very low impedance, say
Under 3 ohms or maybe worse, and THAN you'll find out 'what your amplifier is made of'.
I don't remember which, but tubes typically do NOT like either large capacitive or inductive swings. I don't remember which. And with a tube amps (typically) high output impedance, the damping factor
goes to Zilch when you have an impedance dip at a very low frequency. This is the soure of some speakers simply sounding flabby or very poor bass. They were designed with a high damping factor
in mind. Old-School 'Big Box' speakers worked fine with and were designed for very low damping factor amps. Think 'Voice of the Theater' or Bozak or Klipsch Corner Horn......
