B&W DM603-S3's Anyone?

[annex666]

Cheers again for the reply and the promise of more pics

Just from curiousity what system do you have?

[Jason Hubbard]

I have B&W Matrix 804's which i am very happy with.

The sales literature advised that an active X-over would be available but it never materialised.

I was advised by one of their engineers that a sallen & key filter should be used (sorry - don't know db/octave, etc) and that a simple way to determine optimum x-over frequencies was to measure the voltage on the terminals of each of the drivers at various frequencies (via the existing passive x-over) and plot it all out on a graph to work out what the active x-over should be trying to do.

I eventually managed to get a prototype (one of four?) active x-over originally designed by B&W's Steyning research labs for the Silver Signature speakers and had it customised by them for my 804's (which then had the original x-overs removed). The results were quite stunning and i would recommend going active to anyone.

Hope this is of some help.

[annex666]

Sounds promising, I remember writing to B&W once (albeit an email response form on their website) and got a fairly generic responce.

I would imagine it would be quite hard to remove the crossovers from my 603s and also it invalidates the warranty, so idealy i would like B&W to "assist" me in going active, but I fear the chances of this are slim.

[Holger Barske]

@annex666:
At the moment I run Mark Levinson No. 39, Spectral DMC 12-II/DMA 100s driving a german speaker you won't know, named Progressive Audio Diablo.

[Hugo Rodriguez]

Hi:

"If anyone can point me in the direction of impedance curves and frequency responce curves that would be great....?"

You could like to see:

http://www.stereophile.com/budgetcom...5bw/index.html

At the bottom of the page you may select:

* specifications,
* measurements.

Have a good day!

Hugo

[annex666]

Thanks for the reply - that review some interesting measurements.

[Sonusthree]

Originally posted by navin
nice photo.

in any case not much we DIYers can do to get these drivers right?

Unless you've just found out that a B&W engineer lives in your village!