Why don't speaker mfg list amps and associated equip they use to " voice " their sound?

It would make it seem that their loudspeakers are "limited" to specific electronics.  As such, it would negatively impact their sales.

Alternate question: why don't more speaker mfg "make/have made" their own electronics like Emerald Physic can/does?

onhwy61

Possibly but I doubt it: the audiophile never (almost never) should trust anything but his own ears.

Some purchasing "starts" with a change in speakers, keeping existing electronics - no reason for mfg NOT TO PUBLISH test equipment, in the same vein that testing for promotion (the true reason for equipment reviews) ALWAYS LISTS equipment used...

When your goal is to sell stuff it makes no sense to specify constraints.   

Agree with onhwy61, it would cause some users of electronics different from those used to voice the speakers to dismiss those speakers without hearing them.