Posted by Wayne Parham on July 30, 2002 at 01:08:30

In Reply to: Re: Theater three π vs. four π posted by Erik Johansson on July 30, 2002 at 00:27:56:

The Thermionic Series four π has a lower -3dB point of 40Hz, and -10dB point of about 25Hz. It has usable output just under -10dB (about -13dB) all the way down to 15Hz. So this speaker generates deep bass, but it is also absolutely huge. The Theater four π is smaller, but still a large box. It works well on any amplifier, from the flea-power SET amps to larger prosound amps. The Theater three π is smaller still, a nice size in my opinion, and it works well on most amps. I would suggest a trial on very low-power SET amps but it is fine on all others.