Hello DB,
Since your amp is rated to work continuously into 2 ohms (with a power rating of 1200 watts for that impedance), I don’t think you’ll have an impedance problem. Looking at Stereophile’s measurements of impedance vs. frequency for the two speakers, the worst case occurs slightly below 200 Hz (just slightly above the low frequency crossover point of the 107/2), where both speakers have impedances of close to 4 ohms. So in the vicinity of that frequency the amp would see a load of 2 ohms.
HOWEVER, there are several other concerns with what you are proposing. A factor in some of these concerns is that the LS50 appears to provide just one pair of input terminals:
1)As Erik pointed out, levels would not be matched. And based on Stereophile’s measurements the 107/2 is about 4.5 db more sensitive than the LS50.
2)Most frequencies below a few hundred Hertz (i.e., below the point at which the response of the LF section of the 107/2 has rolled off to insignificance) would be reproduced by both speakers. Those frequencies would therefore be likely to arrive at your ears improperly aligned in time, resulting in comb filtering effects and compromised sound.
3)The fact that the frequencies referred to in item 2 would be reproduced by both speakers, while other frequencies would not be, will compound the frequency response issues caused by the differing sensitivities of the two speakers.
4)If the KUBE equalizer you may want to use with the proposed configuration is set such that it provides a bass boost (and I believe it may do so regardless of how it is set), the LS50 might receive more low frequency power than it can comfortably handle.
The bottom line: It doesn’t sound like a good idea, as Erik indicated.
Regards,
-- Al
Since your amp is rated to work continuously into 2 ohms (with a power rating of 1200 watts for that impedance), I don’t think you’ll have an impedance problem. Looking at Stereophile’s measurements of impedance vs. frequency for the two speakers, the worst case occurs slightly below 200 Hz (just slightly above the low frequency crossover point of the 107/2), where both speakers have impedances of close to 4 ohms. So in the vicinity of that frequency the amp would see a load of 2 ohms.
HOWEVER, there are several other concerns with what you are proposing. A factor in some of these concerns is that the LS50 appears to provide just one pair of input terminals:
1)As Erik pointed out, levels would not be matched. And based on Stereophile’s measurements the 107/2 is about 4.5 db more sensitive than the LS50.
2)Most frequencies below a few hundred Hertz (i.e., below the point at which the response of the LF section of the 107/2 has rolled off to insignificance) would be reproduced by both speakers. Those frequencies would therefore be likely to arrive at your ears improperly aligned in time, resulting in comb filtering effects and compromised sound.
3)The fact that the frequencies referred to in item 2 would be reproduced by both speakers, while other frequencies would not be, will compound the frequency response issues caused by the differing sensitivities of the two speakers.
4)If the KUBE equalizer you may want to use with the proposed configuration is set such that it provides a bass boost (and I believe it may do so regardless of how it is set), the LS50 might receive more low frequency power than it can comfortably handle.
The bottom line: It doesn’t sound like a good idea, as Erik indicated.
Regards,
-- Al