theta crossover question

Can you cross the center over independantly from the L R and rear?

If so I would set the L R crossover to about 30hz 12db/octave

set the rear 50 hz 12db or 24 db

set the center @ 50 12db or so

set the sub to play 50hz down about 24 db

I personally like the L R to be as full range as possible.

Having a little overlap from sub to L R will help with integration of the sub, although the Thiel sub likely integrates very well anyway.

Hope that helps.

Hi Richard,

55hz is likely the 3db down point of the speaker, but it will produce sound beneath 55hz, the speaker just naturally rolls off at that point.

The main purpose of any crossover - active or passive is to take out the frequencies that could damage a speaker, or to basically optimize the frequencies which a transducer is allowed to produce.

I will assume that you can turn off the crossover for the main L R?

So I would set it to OFF for L and R

and use the other settings recommended above.

The reason I say 50 for the center is that you want the center to be as full range as possible. If the speaker naturally has a 55hz 3db down point, a 50hz crossover at 12db/octave will be enough protection and allow you to get as much full range sound from the driver as possible.

Use the points I laid out as a guide. Play with them one at a time and take detailed notes to determine what is best for your system and your room.
Find a piece of music, or a movie which is a good reference and listen to it/play it over and over with the different settings and listen to how each change affects the sound.

you may want to run the sub up to 80hz depending on position and how it integrates with the L R speakers.

Feel free to contact me for more help if you like.

happy listening!