GRS PRT-8 Phenolic Ring Tweeter Replacement for AR-4X CTS Marantz and More

The PRT-8 Replacement Phenolic Ring Tweeter from GRS offers a straightforward solution for restoring crisp, detailed high-frequency performance in your loudspeaker systems. Designed as a direct replacement unit, this conical tweeter breathes new life into vintage cabinets, DIY projects, or any speaker enclosure where the original tweeter has failed or underperforms. Its robust construction and reliable specifications make it equally suitable for upgrading entry-level speakers or for use in custom audio builds where consistent treble reproduction is essential.

At the heart of this tweeter lies a 51mm phenolic ring dome, a material chosen for its ability to deliver smooth, natural-sounding highs without the harshness sometimes associated with metal diaphragms. With an impedance of 8 ohms and a sensitivity of 90.3 dB (SPL at 1m/2.83V), it integrates seamlessly into most standard crossover networks. The DC resistance measures 6.9 ohms, while the resonance frequency (Fs) is 1084 Hz, ensuring controlled performance across its operating range. The unit requires a cut-out diameter of 81 mm and has a mounting depth of 31.8 mm, with overall dimensions of 107.9 mm. Whether you are restoring a cherished pair of speakers or completing a new build, this tweeter provides a dependable and sonically pleasing upgrade that faithfully reproduces the upper frequencies.