ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Hello everyone,I got a pair of S45 which oblige me to do a little place in my stock room. Before doing anything, I tested the 2 pairs of M70 "waiting" at home (dry place)Already the S45 work very well, but the M70 even better ... still better on every kind of music !I did not pay attention at the beginning but when I placed the 4 pieces side by side, I seen: a pair of double foam normal (the big behind, the little glued extra thickness in front) the other is the 'inverse (the big front, the little stuck in overthickness behind and not very visible) = reversed ... Hmmand, at second sight : one speakers pair are left and the other right!2 pairs are M70 ref: 6304, a pair with a serial number in nnnn29the other in nnnn39 (only 10 of difference). These 4 M70s were purchased together for a Beomaster 6000 quad packageWhat is this story ? I have never read anything on m70 "symmetrical" is a version for the quadraphony?Do any of you have any info?Regards
Many Vintages
Beovox M70 "Normal"
Beovox M70 symmetry
from web (I haven't good condition for a good pic, and mines needs some refresh)
Regards
Maybe I can bring some shade of an answer but I don't have the whole story behind that change of the M70's.
The top picture is showing the "early" model whereas the bottom picture is the "late" model manufactured in 1979, last year of production. I can confirm this because I actually bought the pair of speakers of the bottom picture and the woofers are stamped 79 for the year of manufacture.
The "early" and "late" not only differentiate as being left or right but also the woofers are different and the crossover network is also different. Since I also own an "early" pair, I'm curious to know if the crossover network change is an actual "improvement" or something else. The crossover looks like a mix of the S series and the old design. I don't think the crossover change is due to the different woofer because I've the "late" style woofer matched with the old style crossover design.
I will conduct frequency response test between the two models and see how and why there was a crossover change somewhere towards the end of the product of the M70.
I'm pretty sure that Martin (Dillen) has the answer to this enigma...
Hi Jean,despite of differences, there is only 10 of ecart in the serial number, and used with a Beomaster 6000 on a quad configurationThere seems to be buyed in the same lot (?)
Bruno