Wayne Parham Messages: 18791 Registered: January 2001
Illuminati (33rd Degree)
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.
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