Status, October 2026: current. Shure still lists it among its in-ear monitoring systems.
What it is
The PSM300 is a wireless in-ear monitor system from Shure, released in October 2014 (Shure product page). It belongs to Shure's PSM family alongside the PSM900 and PSM1000 and sends two channels of audio from a mixer to a bodypack worn by a performer or DJ, over an analogue FM stereo link with 24-bit digital audio processing.
Every system has the P3T transmitter, a single-channel half-rack unit in a metal chassis with a rack-mount kit and an external power supply. Its two balanced 1/4" TRS inputs switch between +4 dBu and -10 dBV and have loop outputs to a second transmitter; there are no XLR inputs. The bodypack comes in two versions. The P3R ships with SE112 earphones and runs 5 to 7 hours on two AA batteries. The all-metal P3RA ships with SE215 earphones, adds an LCD menu, a two-band EQ and a volume limiter, and takes the optional SB900A rechargeable battery. Twinpack systems serve two performers.
On the bodypack, stereo mode sets the left/right balance of a stereo mix, and MixMode blends two mono feeds into a personal mono mix. One-touch frequency scan finds a clear channel and IR sync passes it to the bodypack. Both packs have a 3.5 mm stereo output for other earphones.
Shure quotes a range of 90 m, 38 Hz to 15 kHz and a signal-to-noise ratio of 90 dB, with up to 15 compatible frequencies per band. It is sold in regional UHF bands between 488 and 937.5 MHz, and Shure says some frequencies may not be authorised where you play, so the band has to match local rules. The transmitter measures 43 x 198 x 172 mm and weighs 783 g; the P3R weighs 98 g without batteries.