Bert's 150 bass filter - Thanks (Oris Horns)

by Tom Russell , Wednesday, March 14, 2007, 05:00 (6253 days ago) @ Rudolf150

Hi Tom,

Many thanks for sharing your experiences; good stuff to read and to think
about.

As you can see from my post below, I am stil in a dilemma between a
bandpass amp or a full amp for the horns.
I agree (there is nothing to agree actually, it is a fact) with your point
about having a dedicated (bandpass) amp for the horns. The bandpass amp I
am considering should go to over 200 kHz (starting from 150 Hz). But
somehow interactions - as you have written as well - between the
components (and room influences, etc.) can change the eventual sound
outcome. In my case I will be using a TVC, which will make the loading by
2 full amp more tricky.

You are correct. Everything is in the system and everything effects everything. Still, I was very surprised at the extent of the difference only changing the filter made. I think there is a good chance that the active filter had been malfunctioning for a period of time. This all came to bear when the active filter lost one channel and I had to replace it. I have no way of proving this as I don't have another active filter to try. Lookingback, thinking that the filter had been causing errant problems before it gave up completely is currently my only way of rationalizing the extent of the differences I experienced.

I am not a specialist, but if you imagine (in your situation) the loads
the preamp is seeing in the 2 setups (I hope I will get it right here) is
different, you could maybe explain the different sound in the horns.

Probably.

Question: between the 2 different setups, did you notice any difference in
the dynamics of the bass?

Yes, and quite a bit. The bass sound is bigger, better, lower, etc. This is part of the reason I think there is a possibility the active crossover was malfunctioning before it quit. I would usually think that an active set-up would be, if anything, more dynamic in it's presentation than a passive set-up. Not so this time.

Tom

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