I agree with Zman... the Lores, like any efficient design, will reveal flaws upstream. On the other hand, it will reward you with postive changes. I would strongly suggest an upgrade(or fix) on the amp when finances permit.
But in regard to the back wall, that shouldn't be an issue really since these are front ported. There is another guy I know that is doing that and I have tried it. Overall, the presentation is basically the same, however, the soundstage is a little more horizontal opposed to realizing the depth capabilities that this speaker can attain. But I suppose that would be true with just about any speaker that is parked up against the back wall.
But in regard to the back wall, that shouldn't be an issue really since these are front ported. There is another guy I know that is doing that and I have tried it. Overall, the presentation is basically the same, however, the soundstage is a little more horizontal opposed to realizing the depth capabilities that this speaker can attain. But I suppose that would be true with just about any speaker that is parked up against the back wall.