Vandersteen 5A's Internal crossovers/batteries

Yes you're right. Thanks for advice.

Hey guys, just a curious question, why are there batteries in the crossover?

Do the crossovers have some sort of a software program in them that requires a battery to maintain memory?

I do agree that you send them into Vandersteen for replacement.

"01-31-15: Mofimadness
Hey guys, just a curious question, why are there batteries in the crossover? "

The batteries are used in the same way AQ uses them in their DBS system.

(((Hey guys, just a curious question, why are there batteries in the crossover?)))
There are three 9 volt batteries in the main inside crossover board of 5s,5A,5A carbons and Sevens that put 27 volts on the capacitors
that are in the signal path this allows the music to sound more transparent and clear.
When you haven't listened to your system in 2 weeks
and turn it on it sounds as good as you were playing yesterday without the half a day plus run in.
As Zd542 pointed out this is part of the same concept as Vandersteens/WEL DBS Syetem patent.
Best, JohnnyR

Active biasing of capacitors in a loudspeaker crossover was invented by Gregg Timbers of JBL/Harman. It is used in the Everest D66000 for an example, applying batteries as mentioned above. In the newer Everest D67000 the bias voltage is achieved via diodes rectifying the incoming voltage from the amplifier which charges an electrolytic capacitor. The advantage to this approach is that the bias voltage always will be higher than the incoming voltage, and there no need to replace batteries.

JBL Everest D66000 XO schematic

Active biasing of capacitors places a bias voltage to a midpoint between two capacitors relative to ground. The voltage can be applied with a battery, or a series connection of batteries to achieve a higer bias voltage or as described above. Th sonic benefit form active biasing is only achieved as long as the bias voltage is higher than the incoming AC voltage from the amplifier, that being said 27VDC (3 ea 9V batteries in series) is certainly high enough for even very loud playback.

Good Listening

Peter