Newbee, due to the "True Series First Order" crossover network design employed in the Caravelles, the system impedance remains quite flat between 7 ohms and 11 ohms throughout the entire range. This is a characteristic of the first order series crossover design. I received this information directly from the Caravelle's designer on the phone, just now.
It remains at an effectively flat 7 ohm level up until the areas above 11-12KHz, and has a slow linear rise as it progresses upwards in frequency to the 25kHz area where it reaches 11 ohms. There are no "wild" impedance changes anywhere in the curve, so that it is very easy on amplifiers of all types. Even some tube amps with higher output impedances will not be adversely affected, because of the very stable non-reactive nature of this speaker system's impedance curve.
The first order series network has alot of advantages in sonics and in matching applications with amplifiers. Some of the potential drawbacks are that back-EMF is more possible to occur with series crossovers, and that the tweeter is potentially subjected to higher power levels because it is operating in a first-order filter(shallower slope), at lower frequencies than higher-order(steeper slope) crossovers would permit. These potential drawbacks will not be objectionable in most cases, and the advantages of time alignment and correct transient behavior, as well as the superior flatness of the response and impedance curves will be far more important aspects to most users. Additionally, if there were any woofer-specific impedance changes that would potentially endanger the tweeter, the crossover frequency would automatically shift(sliding) upwards which provides additional protection for it. This is an inherent factor in series first-order designs, and is not any kind of "switching" mechanism. The crossover point just "slides" with any shifting impedances, and the amplitude response and impedance curves remain flat. The back-EMF issue is something that most amps have no difficulty dealing with, and should never be in issue, in practice. The main factor is the sound quality, which is very coherent and seamless in nature, fast in response, and open and natural in quality.
I hope that sufficiently answers your questions about the impedance of the Caravelles. Including "pros and cons".
It remains at an effectively flat 7 ohm level up until the areas above 11-12KHz, and has a slow linear rise as it progresses upwards in frequency to the 25kHz area where it reaches 11 ohms. There are no "wild" impedance changes anywhere in the curve, so that it is very easy on amplifiers of all types. Even some tube amps with higher output impedances will not be adversely affected, because of the very stable non-reactive nature of this speaker system's impedance curve.
The first order series network has alot of advantages in sonics and in matching applications with amplifiers. Some of the potential drawbacks are that back-EMF is more possible to occur with series crossovers, and that the tweeter is potentially subjected to higher power levels because it is operating in a first-order filter(shallower slope), at lower frequencies than higher-order(steeper slope) crossovers would permit. These potential drawbacks will not be objectionable in most cases, and the advantages of time alignment and correct transient behavior, as well as the superior flatness of the response and impedance curves will be far more important aspects to most users. Additionally, if there were any woofer-specific impedance changes that would potentially endanger the tweeter, the crossover frequency would automatically shift(sliding) upwards which provides additional protection for it. This is an inherent factor in series first-order designs, and is not any kind of "switching" mechanism. The crossover point just "slides" with any shifting impedances, and the amplitude response and impedance curves remain flat. The back-EMF issue is something that most amps have no difficulty dealing with, and should never be in issue, in practice. The main factor is the sound quality, which is very coherent and seamless in nature, fast in response, and open and natural in quality.
I hope that sufficiently answers your questions about the impedance of the Caravelles. Including "pros and cons".