As a part of a whole-house audio system, invisible speakers will increase your budget around 10% per room.
Consider the cost of a distributed audio system in a typical living room. The cost of electronics, wiring, automation, and everyday speakers puts you around $10k. Switch to invisibles and your budget inches up to $11k. A 10% overall increase in cost.
Part of that cost is the speaker itself. Invisible speakers
are more complicated to build, and use expensive materials for durability. So a
LW1200 speaker, at $750 each, is more expensive than a sonically similar
high-end architectural speaker.
Now add the cost of installation. Invisible speakers require
an additional site visit from your Integrator. During the first visit, the
integrator may choose to install an optional backbox. (See Do I Need A Backbox?) Following drywall application, the Integrator returns to install and
test the speaker. After taping and finishing, the Integrator returns again to
test and tune the system. Anticipate an extra hour or two per speaker for
installation vs. a traditional speaker.
For bass to 80 Hz (see Frequency Response) and equivalent coverage,
you would need 4 Live-Wall speakers ($750 each), or 6 architectural speakers
The in-ceiling speakers, painted to match the ceiling, would
cost $2,100 plus another $600 for painting.
The Live-Wall speakers would cost $3,000.