The top and bottom tweeters are in series, thus each gets half power. That pair is in parallel to the center, which gets full power.I remember reading something too about only 1 tweet running the higher stuff.
1.3khz is a rough crossover point for those tweets I imagine, but running 2 (or more) lessens the load.
It was sobering to learn of the original company's decision to throw in the towel in response to the crimal activity of the chinese cloners, and those that supported it thru the sales channels. Countless companies have suffered similarly but M&K's story stood out to me.
So, per that definition, I would say the foam would cause a loss of energy as it's absorbing high frequencies as apposed to simply modifying them like a horn or other hard non acoustically porous device no?In my understanding of the definition, it is: "A waveguide is a structure that guides waves, such as sound (acoustic waveguide), light (optical waveguide), radio waves (radio-frequency waveguide) or other electromagnetic waves, with minimal loss of energy by restricting the transmission of energy to one direction."
Yes, it won't reflect like hard surfaces do. The question is, definition-wise, where "minimal" energy loss ends (in this case it would be a "miniature" absorber). Whatever we like to call them, they seem to do their job, in a simple and cost effective way.So, per that definition, I would say the foam would cause a loss of energy as it's absorbing high frequencies as apposed to simply modifying them like a horn or other hard non acoustically porous device no?
Very cool. An irreplacable piece of speaker history. The M+K guys were really clever.I have a trio of unique, one-of-a-kind M&Ks. These started life as regular S150s in the short lived cherry veneer cabinets. Being in the business at the time, and having gotten to know Ken and Chuck, they agreed to do for me a very special thing, what amounted to a "field upgrade", turning them into the pro MPS2510 (which were never made with the veneer cabinets). Specifically, they sent replacement tweeters (upgrading them all to the better TL ones), replacement foam appliques (slightly different sized pieces) with some VERY PRECISE instructions as to where to position them, and of course the crossover was swapped out. The latter being the real key: Unlike the consumer S150, the MPS2510 had two switches. The first changes the vertical directivity from THX spec (very narrow), to Wide (or "not so narrow"). The latter being to address the abnormally close distance one might find themselves at a mixing console where its not hard to be outside of the sweet spot vertically (at home theater distances somewhat less of an issue). Still, I've always used them in the wide setting as I do enjoy slouching in my la-z-boy during a movie and yea, I can hear the attenuated treble if I do so in the narrow setting. IIRC this switch was added to very late model S150s prior to the company closing. The other switch, only ever found on the pro crossover, was even more interesting, though esoteric: A single/stacked selection. In the stacked setting, the top/bottom tweeters no longer get the different signal (which is what gives the trio their vertical directivity). Instead the three get an identical signal, turning them into a line array. This was so that 2 or more MPS2510s could be stacked on top of each other (creating a 6+ tweeter line array of sorts) for when an application called for even more output (which is crazy when these things are already capable of a prodigious, clean, uncompressed output).
These have been the pride and joy of my reference theater for almost 20 years now and I have no inclination or interest in replacing them. With the corresponding MX-125 sub (also one-of-a kind having been built custom with MX-350 drivers) with the crossoever they were designed for, they are quite simply the perfect speaker in my estimation. I only wish I had gotten a set of Ken's tri-pole surrounds before he shut down the company.
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NiceCurrently using 3 S150-THX as my main LCR, and the newer MP-150s for my side surrounds mounted up from the listening position. Those MP's have 6 degree down angle built into them. Rocking the old MX350 still, and have a "custom" version i put together when the company went bankrupt and i picked up an empty enclosure, and added my own amplifier.
I will post some pics soon.