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Help with biwiring logic

restorer-john said:
Pretty sure the Philips MFBs (domestic and studio) beat them to the punch from the early 1970s:

www.inner-magazines.com

Philips RH 545 Studio | Inner Magazines

The RH 545 Studio was Philips’ most advanced MFB loudspeakers monitoring its own playback through a feedback loop.
www.inner-magazines.com
Click to expand...

Cabasse (France) has a 3-ways active speaker with electronic cross-over in 1965 :

pub60-te293-0265-cabasse-galion-3vt.jpg



See : https://www.forumcabasse.org/wiki/L'enceinte_acoustique_Galion_-_3_voies_-_Amplificateurs_intégrés

It is said Cabasse realized a 3-ways active speaker with tube electronic cross-over and power amplifiers in 1958, but, unfortunately, no evidence or documentation other than a manufacturer's timeline has emerged to this date.
 
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fpitas said:
Altec offered a biamped 9846 way back when:

Click to expand...
Interesting. but this is not a domestic device.
Cabasse is interesting too, but I don't read french, so I am not sure if it was a domestic device.
The Philips one really takes the biscuit! wonderful idea that unfortunately never caught on.
I do remember the Philips speaker, but now I believe it must have been a reincarnation. it was probably 80s. The idea of monitoring the bass driver diaphragm movements, and use it in the feedback loop, was simple and artful. From what I had heard, effective too.
 
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Ken Tajalli said:
Interesting. but this is not a domestic device.
Cabasse is interesting too, but I don't read french, so I am not sure if it was a domestic device.
Click to expand...
The Cabasse Galion 3VT (VT="Voies transistorisées", for "transistorized ways") and the larger Brigantin 3VT and Escadre 3VT were domestic speakers, as can be seen in the 1965 Cabasse catalogue (speakers n° 6 & 7 and penultimate page at the end of the webpage) : https://www.forumcabasse.org/wiki/Catalogue_1965
 
antcollinet said:
I think you are mainly referring to power capability.

So if you have (say) a 100W amp that is capable of delivering 100W both channels continuous without clipping, then by purchasing another identical amp, you can gain some power by delivering one channel on each side to the tweeter.

But with a typical 3KHz crossover, there might be an 85%:15% split between woofer and tweeter. So you can now deliver 100W to the woofer and then maybe 18W to the tweeter.

So you have gained a total of 0.72dB of peak power, at a cost of one full 100W/channel amp.

I guess you might argue that each amp is also now having an easier life, but `i would say that is pretty meaningless if you are playing real music without clipping, since the actual average power is probably already only 10% or less of the amp continuous rating. Biamping only reduces that to 6%
Click to expand...
I believe all musical peaks are in sub 300Hz or so, even lower!
Most mid-budget amps of the era were PSU limited. The aforementioned Meridian 103, a 35W amp, could hit 70W, even more with lower impedances on bursts on one channel only.
Using such an amp for one side, meant, you would get plenty of headroom on bursts on bass channel. The treble channel didn't require much current.
Also, each amp would see a simpler load. The 103 could manage down to 3 ohms but no less. It could use any help in that area.
On a not-so-related point, that was why the D version, with double PSU, could more happily manage lower impedances. And with extra reservoir caps, had more burst power overhead.
I have fond memories of that amp (can you tell?).
It was my first real Hifi amp. I bought the second PSU a year later. I was a student, so couldn't afford a bigger amp. Looked odd and wonderful .
 
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