Strange speaker config.

[Papajoe 221]

I have removed the crossover from the Vandersteen 2Cis that I am repairing. I am drawing a schematic of the circuits. I came upon an interesting fact. The variable pot that is marked ' Bass' is not connected into the woofer circuit, at all.  It is part of the Midrange/ tweeter circuit. It is connected directly to the Midrange speaker lead. There is a direct connection from the pot that feeds the tweeter back to the midrange pot, though. This system is bi-amped and so I am feeding full range signal to both the 'Bass' and 'tweeter/midrange' connections. Am I correct in saying that : the 'woofer' circuit 'filters out all but the lower range. While the midrange/tweeter areas filter out part of the lower range and uses the rest of the signal. I 'wrongly assumed' that the "bass" pot adjusted the level of the Woofer. It appears that it just adjusts the signal to the midrange driver. I guess that 'roundabout' it would increase or reduce the bass signal being fed to the midrange and so that makes the 'woofer' look like it is being controlled. Boy what you can find out when you get deep into the electronics of speakers.

Papajoe

[Daddyjt 9,585]

I guess that kinda makes sense - there is no way, once the amplified signal gets to the speaker, to further "boost" the bass level. To achieve a perceived bass "boost", you would have to attenuate the mid range/treble.

 

Never really thought about it, but that thought is consistent with what you are seeing in the guts of the speaker....

[oldtexasdog 2,456]

Those Vandy's are a diffrent breed. They have no "box" so the speakers are time alinged as I understand.

[Papajoe 221]

I now see why the only damage so far is one blown woofer and a few burnt resistors. They must have been the first hit by the short.

Papajoe