Vandersteen Quatro crossover

[awedio]

I suggested that audible diferences are harder to quantify. I wouldn't expect big changes, but that's because the XO is already of high quiality.

But I would certainly expect to hear changes, while you state:
>(different)/expensive components won't make any audible difference.

This is where we are not on the same page. Perhaps your avatar, Beethoven would agree with your take on caps.

[sreten]

Hmmm........

Waffling on about component differences which may be audible or not
but certainly will not give significant improvements seems pointless.

Especially when there seems to be far bigger fish to fry .....



/sreten.

[wigginjs]

Wow, I think I'm with sreten on this one.

So, let me get this straight . This speaker manufacturer included a box to place in between your preamp and your amp that is a 100Hz high pass, passive, batter-biased filter? I'm not a super-hifi expert, but I've never heard of anything like this. Why didn't they just accomplish this filter in their speaker xo? Component cost? Why is it biased with a battery? Why isn't this done more often? What happens when the battery dies? What happens when the battery gets weak? Why wouldn't they make it active w/ a power supply? Expense? I'm really intrigued...

[wheezer]

The dip switches are used to match the input impedance of the amp for a -3db from 1K to 100Hz tones from a CD or a sig gen and oscope.
The stereophile link gives some details.

[jam]

I have worked with this speaker. Sreten is right on this one leave it alone..............on second thoughts there is one way you could better this, with a good active buffer after the filter...........but then again you are introducing more electronics in the signal chain.

Jam

[wheezer]

Thanks Jam

[analog_sa]

Originally posted by m0tion
What happens when the battery dies? What happens when the battery gets weak?

The battery will eventually get weak once it's over its shelf life. 5-10 years? Nothing much will happen once it's dead - just the caps won't have the polarising voltage and the dielectic will be a bit more non-linear. JBL and others also use it. Also some cable manufacturers. It's a lot cheaper to use a battery than more expensive caps. Laziness has so far prevented me from testing this idea. Maybe wheezer can take out the battery and give it a listen?

[fteixeira]

Wheezer,

I just found his thread. Do you (or anyone else) have the circuit diagram for the crossover?

I know the dip switches are used to sent the crossover frequency. However, I'm not totally clear how the caps are connected.

Thanks in advance.

fteixeira

[wheezer]

Neither do I.
I do have some Vit Q's and Gudeman to replace the infini and/or wima.
But have not done it yet.

[sreten]

Hi,

The dip switches adjust impedance (basically in parrallel with
the variable between models amplifer input impedance) such
that the capacitors values are correct for 100Hz 1st order.

There are far simpler / cheaper ways of doing it at the amplifier input.

/sreten.