Why would low voltage wiring be a concern to the electrical inspector? Unless the US rules are different than Canada electrical inspectors here don't want anything to do with low voltage wiring because there isn't enough amperage on the wires to cause bodily harm.

In-wall rated wire is a building code requirement.

To answer how we do it is similar to most other responses, run 14/4 to first speaker, leave a loop and run to the second speaker. Slit the jacket at the first and cut your pair required then place the other pair back into the jacket.

If doing a jump of 14/2 between the two speakers you now have three areas where the connection could go bad. Thinking of it at a troubleshooting standpoint you now have to determine whether the issue is at speaker 1, speaker 2, or the amp, which may require you to remove both speakers from the ceiling/wall to find the problem.

If doing a loop you know that it is a solid wire between the amp and speaker and only requires two areas of concern if needing to troubleshoot.

For us, troubleshooting is usually on our dime (depending on when the installation happened) so the faster it takes us to troubleshoot the system the more money we save.