Vandersteen high-pass filter with other Subs

That won't work as far as I know Judit. If I am not mistaken the REL uses a line level signal. The much higher voltage amp output the Vandersteen uses would overload the REL's input.

You mentioned midrange congestion before. Do you find this to be the case without the woofers? I still think it is your room sound, or a set up/placement issue. I would try moving things around first. Room tuning devices may be in order if all else fails. What are the rest of your components and what is your room situation like? Where are the woofers? I understand that it is easy to assume qualities of a component and then find out later that it was something else entirely that was the culprit.

Judit, are you talking about the sound of just the two speakers by themselves or when used with the REL's? Are they placed in the same spots when you make this judgment? I am sure I am not telling you anything you don't already know but the 805 and the 3 ARE VERY different speakers. You don't even need a high pass filter with the 805 as they are already rolled off 6db at 42HZ! Nice first order slope built right into the design! The Vandersteen goes much lower. Down only 3db at 26Hz. Still sounds like a set up issue to me!

Judit, Have you gotten your Vandersteens back from the upgrade? I am wondering what you thing of the changes. I ssume that their will be some run break-in time that will be required. Be very careful in setting the rear tilt on Vandersteens, as this can account for what you describe as well as room interactions.

I am not familiar with the Chesky set up disc and wonder if you can tell me a bit about it? I know that some people rely on computer programs to position their speakers which in my opinion is flawed, compared to setting them up by ear.

You may find it interesting to read Richard Hardesty's issue #2 of the "Audio Perfectionist Journal", which can be downloaded from his web site for free. www.audioperfectionist.com