Mainstream reviews-why so few?

I think manufacturers have to agree to certain things like long term (almost open ended) loans to reviewers, no preview of review, keeping some distance after item has been set up and verified to be working properly, etc. I knew a speaker manufacturer about 15+ years ago who refused to do these things (he really wanted to stay in touch with the magazine on a regular basis and know what the reviewer was thinking all along). He got only one review, which was positive, but ended up pissing off the mags with what they claimed was his "butting in" too much.

Twas always thus. One hand washes the other. It is convenient to rely on cliches as I have just done but it also disingenuous to dismiss any and all suggestions of misbehavior as conspiracy theory. There are systems of graft at play everywhere we look today and it certainly isn't difficult to draw certain conclusions about the way we see the review process plied.
Green Mountain Audio has been producing exceptional product for nearly 30 years under one name or another and has spent most of that time in the shadow of lesser products with better connections. His neighbor Jeff Rowland has been harder to overlook but he too has been largely ignored in the same way.
Some years ago I was affiliated with a small company that made one product only but it was one of the best engineered and packaged products available then. The Timbre Technology TT-1 Dac was submitted to the Absolute Sound for review. They assigned it to Jonathon Valin. He jumped ship and went to Stereophile taking the Timbre with him. He subsequently gave it a rave review in that magazine but, unfortunately, was trumped by Robert Harley when he was the resident expert. Harley at the time was promoting any and everything offered by Sonic Frontiers and Timbre became the victim of his overriding faint praise. That began the end for Timbre even though it was arguably one of the very best DACs on the market at that time. The company struggled for about 3 more years but ultimately had to give up the ghost. Many small manufacturers are aware of this or another similar tale and scrupulously avoid submitting themselves to that potential abuse.
It's a big gamble that can make or break you. Unless you have the money to encourage praise of your product, you will likely be relegated to obscurity or otherwise abused. Ad money works in audio like campaign contributions in politics.

" They assigned it to Jonathon Valin. He jumped ship and went to Stereophile taking the Timbre with him." Really? I doubt it.

Kal

VMPS, another mfr that gets no print but great personal reviews, has much to do with the outspoken owner. Brian Cheney is virtually black-listed.

Seandtaylor99 - GMA more forthcoming with measurements??? They publish more data than about any other speaker manufacturer I can think of. Have you looked at their comparison charts on the site? There is a lot of data, including things like dispersion and impedance variation tolerances that damn near nobody in the industry publishes.