The quandry here is to give you an answer and not sound like I'm being evasive. This whole area is driven by subjectivity.
hbpumba - I can't really give you an opinion because I've never heard the Sunfire sub you mention. Interestingly, I don't remember seeing it mentioned in the extensive research I did. My uninformed guess is that you don't have enough subwoofer.
zathras - "which is the better buy" falls into a gray area. That decision is really based on what you want to accomplish. Maybe this brief explanation I got from the good folks at SVS will illustrate:
- The 20-39 goes down to 20hz and provides a bit more LFE detail at the bottom, but doesn't play as loud as the 25-31.
- The 25-31 "only" goes down to 25 hz, but has "more headroom" (plays louder) than the 20-39.
My decision was for a bit more finesse in capturing more detail rather than a little more brute strength and that is why I picked the 20-39. Also, the room/space configuration allowed me to get the PCi model (320 Watts), rather than the more powerful Plus model (525 watts).
Here's the deal - write down your room dimensions and what other space you open into (kitchen, foyer, etc). List your equipment. Call the folks over at SVS or even HSU. They are as wonderful as the Axiom crew and will help you with a very effective subwoofer decision. For sure talk to the Axiom folks as well about the EP350.
I'd like to give you a definitive answer on which sub is right for you, but I just don't have the bandwidth. Unfortunately, I have just enough knowledge to stick my nose into the occasional thread and be disruptive
. I can tell you this - the experts at SVS or HSU will point you at a sub that will make be right for you and enhance your whole HT experience. In this decision, don't scrimp; you don't want to be "almost happy" and you will be amazed with what a good sub adds. Enjoy the chase.