tournedos wrote:

I don't think Sonab ever made elements either, so I don't think there's any truth behind this. I won't bet on it though, the original drivers in Beomaster 900K for example were made in Sweden. And yes Andreas, B&O made drivers as well, already before any one of us was born 😕

Anyway, many of Sonab's Carlsson era speakers were quite good. The 'orthoacoustic' models with multiple tweeters pointed everywhere could also be considered technically somewhat similar to Beovox cube based setups, although at a later time...

You are right Mika!

I so seldom think of B&O the way they used to be back in the old days. 🤒

BenSA wrote:

Step1 wrote:

Ask him how he knows and which era or even speakers they made drivers for. If he is so adamant he must know more?!

 

It was the same era as these speakers below. He says that Sonab manufactured the entire speaker for B&O, says the type stickers at the back of Sonab's are the same style as B&O. Like that means anything. I'm not sure how these Sonabs sound as it seems a bit odd to have the woofers etc....postioned in such a manner.

These looks pretty much the same as Salora Orthoperspecta's center speaker from the 70's. Maybe the same make.

Pekka

majand wrote:

These looks pretty much the same as Salora Orthoperspecta's center speaker from the 70's. Maybe the same make.

Pekka

Terve Pekka 🙂

They are not the same, at that time Salora made its own speakers (and obviously Sonab too). The Ortoperspekta center speakers were full range and otherwise rather conventional, only the woofer was on the top. link to one test (in Finnish), including a picture without frets.

There's a real B&O connection in them, though. For anyone not familiar with the Ortoperspekta system, it was developed by Tapio M Köykkä, a renowned audio engineer that did some pioneering work discovering TIM distortion, for example. In Ortoperspekta, the center speaker plays both R+L channels, and the stereo imaging is created by two satellite speakers, playing R-L and L-R. The satellite channels can be much lower power, and the system creates great spatial imaging into a wide listening area.

Köykkä (his company Voimaradio) patented the system in the early '60s. Now, the pseudo-quadraphonic systems introduced later - like B&O's Ambio system - work pretty much exactly the same when playing back 2-channel stereo, thus working against Köykkä's patent. B&O went through every court level with this and lost them all, and ended up paying Voimaradio for using the Ambio system (as did some other manufacturers).

Here's one example of Salora's line of Ortoperspekta systems, this one sporting a Thorens TD 160 record deck: