I've lost my bass....

Get a sub woofer. Amp type will only change quality of bass - it won't do much for quantity. Room treatment won't do anything for bass. You can play with the distance the speakers are from the wall to enhance the bass, and with the listening chair to find a room created bass rise. A sub is probably the easiest and best way though.

Cellorover, Interestly I think you may have reached the correct conclusion, that he should consider getting new speakers, but for the wrong reason. I suspect the Virgo's are just not capable of energizing the bass in a room as large as the one he now has to use (with any amp!) but personally I see no reason why he should have to find a new speakers and, potentially an amp, when a sub will do. But since you mentioned it, why not elaborate on why a well integrated sub would not work for him and save him the cost and expense of buying new speakers, etc.

Sean, Rsbeck, and others who mentioned the amp - I don't disagree with you in principal, however I didn't see this as a potential solution to what sounded like a substantial loss of bass. Apart from the placement issues I saw a sub as his only viable solution and still be able to keep the Virgos. Recall in his original placement he felt the bass was not outstanding, merely adequate.

Now if his complaint is really just a minor one about bass quality or quantity then the amp becomes a real factor - as I recall the CJ is not an earthshaking bass amp, either in quality or quantity. Perhaps he should get a RS sound meter and a test disc and measure the bass response at the various listening positions and see how far off flat his bass is, and what frequencies need boosting, before he embarks on any revisions. Perhaps he just has overambitious expectations re bass. Perhaps further feed back from the poster would help him get some more specific recommendations.