Here is what a rep from Totem said:
Hello Attila,
Thank you for the email
As your Pioneer is not rated for a 4 ohm speaker I would recommend the (8 ohm) non sheilded version of the Model 1 Signature Centre. there is less chance that the amplifier's self protection mode will be engaged with this choice of centre channel.
If you have a CRT based television then you will need to keep the non-sheilded version of the Model 1 Signature Centre at least 3 to 5 inches away from the front of the tube. The size of the tube will determine how close you place the speaker to the television. If you are using a plasma or LCD (LED) type screen you do not have to worry about how far away the speaker is to the display.
We offer both types as there is still a demand for a centre channel that will not adversely effect a CRT type tube.
I hope this helpful. Please let us know if you need more information.
All the best,
John Healey
Totem Acoustic
514-603-9900