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8020/7050 Home theater setup

olli-vainio, modified 13 Years ago.

8020/7050 Home theater setup

Youngling Posts: 2 Join Date: 4/10/09 Recent Posts
Hi

I recently switched to the world of Genelec by buying a pair of 8020A's and I must say that I'm very impressed so far! I'm also now considering getting a 7050B to complement the setup(and of course more 8020A's some time in the future to create a 5.1 setup).

So, my question is this:

As I've understood, there's a possibility to connect front channels from the pre-amp to the 7050B and then from 7050B to 8020A's and set the front speakers as "large" from the pre-amp and the 7050B then handles the crossover at 85Hz.

If the system works as I've understood, is it a better solution to do it this way or just plug the 7050B to the pre-amp and let the amplifier do the crossover at 80Hz?

//Olli
christophe-anet, modified 13 Years ago.

Re: 8020/7050 Home theater setup

Jedi Knight Posts: 188 Join Date: 3/23/09 Recent Posts
Hello,

Thanks for your post and kind comments. Glad to hear you are a happy 8020A's owner.

Both connection schemes you describe are correct. Using the bass management of the 7050B gives you matched crossover slopes between sub and main channels; it also gives you the opportunity to precisely adjust the crossover phase between the 8020A's and the 7050B, thanks to the subwoofer phase adjustments DIP switches located on the amplifier panel.

Now, most AV amplifiers/preamplifiers offer a 2nd order high pass filters for the speakers and a 4th order low pass filter for the subwoofer. This comes from the THX standard which states that the speakers used must have a corner frequency at the selected crossover (i.e. 80 Hz) and a 2nd order frequency response slope below it. Basically this means a sealed speaker with no additional high pass filtering. When combining the 2nd order slope from the speaker and the amplifier, the result is a matching 4th order slope with the subwoofer channel. As very few speakers are built as specified, problems with phase matching and frequency response will occur.

Other adjustments like time-of-flight to each individual loudspeaker should be done inside the AV amplifiers/preamplifiers. Now, almost all modern (even cheap ones) AV amplifiers/preamplifiers offer a distance setting for every channel including subwoofer, which can be used to match the subwoofer's phase with the selected channel/speaker. Usually AV amplifiers offer 30 cm or smaller distance setting increment i.e. ~25 degrees at 80 Hz.

The relative sound level calibration between each loudspeakers can be done either on each loudspeaker (volume knob for the 8020A's and volume trim pot for the 7050B) or also inside the AV amplifiers/preamplifiers.

Happy listening!
Best regards,
olli-vainio, modified 13 Years ago.

Re: 8020/7050 Home theater setup

Youngling Posts: 2 Join Date: 4/10/09 Recent Posts
Thank you very much for very detailed explanation!

//Olli