The Ground Zero GZRC 165/28-IV SQ is an updated version of the legendary GZRC 165 Anniversary-25 speaker series.

Good-sounding GZRK 165SQ elements are used as midbass of the GZRC 165/28-IV SQ series. The tweeters are new high-quality 28mm silk domes (GZRT 28SE). The goal of designing the series has been the best possible sound quality in its price category. Klippel optimization has been used in the design, which allows the structure of the speaker element to be polished to the last level of functionality.

The elements work excellently in typical car installation locations. Instead of casing, Midbasso works better in door installation without building separate casings. Midbasso has an aluminum cone and rubber suspension. Lower than normal 3 Ohm impedance helps to extract more power from the instrument or amplifier.

The treble is a silk calotte treble. The splitters have been considerably smaller than their predecessors and have a three-stage level control for the treble and a high-pass frequency control that helps to adjust the sound to the best fit for the installation location.

The mid-bass has its own 6db/oct low-pass filters that are already attached between the supplied speaker cables. The speaker grills are included in the package.

Read Autohifikanava's listening review in the manuals tab! Power handling (RMS): 130W
Power handling (Max): 200W
Impedance: 3 Ohms
Frequency response: 35 Hz- 25 kHz
Cut-off frequency 4300 Hz (6/12 dB /oct)
High pass filter settings: -2dB / 0dB / +2dB
Midwoofer/Tweeter
Efficiency: 90 dB
GZRK 165SQ outer diameter: 165mm
GZRK 165SQ mounting cutout: 142.5mm
GZRK 165SQ mounting depth: 68mm
GZRT 28SE outer diameter: 54mm
GZRT 28SE mounting cutout: 48mm
GZRT 28SE mounting depth: 18mm.