Infinity IRS Sigma for 2K...Should I do it??

The Sigmas do need some room to do there thing properly as they do not sound that great at low volumes - they need a very good amp as suggested above - the Innersound and Electrocompaniet are also good high current choices. They are really good speakers and at 2k I would probably talk myself into givivg them a shot because you could easily get all of your money back or even more if they do not work out.

I was part of Sigma's design team and can tell you catagorically that Sigma is a fine speaker; however, it is influenced greatly by the power amp., other electronics and connecting wire. Sigma is slightly bass heavy in a small room, therefore, room size is of consequence. The speaker must be kept on tiptoes to keep it raised off the floor for cleaner, more articulate bass response. The system should be biwired for optimum results. Separate power amps will produce even better sound but the amp on the bass end must have high current capability. Sigma's impedance, as I remember, is quite low and will turn off mediocre power amps with flimsy power supplies and heavy limiting in the output stage. If you require additional input, let me know.

I looked up the Sigma's manufactured cost and it came to a little above $4,000 a pair packed and ready for shipment. It may surprise you, however, that the Sigma was not designed for the U.S. market. It was ordered by Infinity's office in Denmark who had orders for over fifty of these fine speakers, plus an order for twenty-five for Japan and the rest of Asia. The original wood was Sandos but it turned out that this type of wood (like Rosewood)was scarce, so we went to a walnut color. It looked fine.
If the person who owned the pair of Sigmas that you are considering buying didn't abuse them, then the 2k price is a good one.

How did sigma wind up in the U.S. market? I suppose that marketing had a few dozen pair remaining and sold them to various U.S. dealers at special prices? I really don't know specifically how people in the U.S. obtained Sigmas but the dark walnut turned up in various places.

Since the woofer is fairly close to the floor, the speaker should be raised off the floor as much as possible (without affecting its stability) to prevent it from using the floor as a bass enhancer. Bass resonse on the Sigma has a gentle rising characteristic in free space and the floor merely adds to the rise if it is too close. The spikes that come with the speaker are mandatory.

Leon, thanks for all of the background info on these speakers. Out of curiosity, do you remember what woofers were used in these speakers ? I know that Infinity had used some Watkins "dual drive" woofers in some of their models of the same time frame. Is that what made it into the Sigma's also ? Sean
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My apologies for never following up on this. I've decided not to purchase the speaker for three reasons. 1) They simply will be too big for my room. 2) I don't have enough power to drive them properly. 3) I've fallen head-over-heals for another speaker. I'm eagerly awaiting the arrival of my Magnepan 1.6/QRs.

Thanks to everyone for your posts and my apologies once again for not keeping on top of this. Poor etiquette on my part.

Happy listening.