For real Diamond's, you can drop by my office to check them out. And you can bring the ones you bought to compare too. The very old M series are known to have plenty of fakes. The M series was discontinued many years ago.

Honestly, Diamond products are one step above the likes of Soundstream, Lightning Audio/RF, Kicker, Magnat etc. Even their entry level speakers, subs and amplifiers are very respectable and matches the performance of mid-end models of other famous commercial brands.

Coincidently, I have last year's (2007) model Diamond D361 and D362 component speakers to clear. PM me for information and my contact number. Includes full package, new with authorized 1yr warranty. Remember if there's an i at the back of the model, those are co-axial speakers and not component speakers. Do not compare prices in the web since those are non-authorized and you do not get any warranty. Probably cost you USD30-50 bucks to ship it here and clear customs too.

Cheerio.