There was a guy here on Audiogon that was running Perreaux PMF-2150's in bridged mode to drive Apogee's. I can't remember who it was, but that is one helluva testimony to the ruggedness / reliability of the Perreaux. In bridged mode, the amps were seeing somewhere around half an ohm (.5 ohms) !!!
As a side note, my Perreaux 3150's have no problem driving very low impedances. Much of this has to do with the heavy gauge output inductor that Perreaux uses. Not only does the amp maintain a low output impedance as power is increased*, it can pass more current on demand as needed without any type of restriction. That's why these amps, when running properly, have great bass impact. Most amps have relatively scrawny output inductors, so they lack the capacity to pass enough current as needed. The end result is a lack of control as impedances are reduced and a reduction in "slam" at any impedance.
Other than that, the two channel Sunfire Signature will drive Apogee's with no problem. Sunfire even has a specific set of "factory mods" that they do for Apogee's. I've had this done to my Signature and it noticeably increased the bass impact. One of the reasons for better bass response ? They install larger output inductors to pass more current : ) Sean
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* damping factor varies with the dynamic load and output levels that the amps sees and responds to. Many "techs" & "engineers" will say i'm off my rocker, so believe whom you want.
As a side note, my Perreaux 3150's have no problem driving very low impedances. Much of this has to do with the heavy gauge output inductor that Perreaux uses. Not only does the amp maintain a low output impedance as power is increased*, it can pass more current on demand as needed without any type of restriction. That's why these amps, when running properly, have great bass impact. Most amps have relatively scrawny output inductors, so they lack the capacity to pass enough current as needed. The end result is a lack of control as impedances are reduced and a reduction in "slam" at any impedance.
Other than that, the two channel Sunfire Signature will drive Apogee's with no problem. Sunfire even has a specific set of "factory mods" that they do for Apogee's. I've had this done to my Signature and it noticeably increased the bass impact. One of the reasons for better bass response ? They install larger output inductors to pass more current : ) Sean
>
* damping factor varies with the dynamic load and output levels that the amps sees and responds to. Many "techs" & "engineers" will say i'm off my rocker, so believe whom you want.