Dunno what your installer is charging you for it, but it's listed on Amazon.com for ~$320. For $300 or less when it's on sale at Newegg.com (at this time, it's selling for $279), you can snag a Klipsch RW-12d which will easily outperform the Jamo.
Have the installer take back the Jamo, if you can. If you can't, well, I hope it rocks as well as he says it does.
I have two of these in a theater in opposite corners from the listening area and they are loud. I loved their small footprint and piano white finish. They replaced my velodyne 12 and I have never regretted it. They are very clean in sound.
I also have two of these (or rather the Mirage version) in a home theater/music setup that I chose to keep compact. I'd say they are ok. They are a little loosey goosey so with music I find the bass to be undefined and lack transient response. I think the loose nature helps in a home theater environment because it adds to the rumble.
I'd recommend them maybe if you really need small size but if you have room, I am confident you can do better for the money.
A forum community dedicated to home theater owners and enthusiasts. Come join the discussion about home audio/video, TVs, projectors, screens, receivers, speakers, projects, DIY’s, product reviews, accessories, classifieds, and more!