Code is 6" between high-voltage and low-voltage circuits when running parallel to each other. Code doesn't go into great detail concerning heat output from recessed fixtures and running Low-voltage in the same raceway. Best thing to do is to just tack the low-volt wire opposite the high-volt wire and run it past the fixture. This should give you enough clearance past the fixture unless the fixture is huge. If that isn't possible, you could come in on an adjacent raceway and come back in where the speaker will be mounted.
Denon AVR X7200WA, Emotiva XPR-5, Emotiva XPA-7, Sony XBR 75" 850C, Oppo BDP-103D, Roku 4.
DefTech BP7000SC (L/R), CLR3000 (C), SM55 (FH), UIW BPZ/A (SB), UIW 75 (TM).
JBL L7 (Sur), EoSone RSR 350 (RH).
PC 2.1 setup. Emotiva Stealth 6, SVS SB2000 sub, Emotiva DC-1 DAC.