The EMG BQS-HZ System is the HZ-compatible version of the BQS three-band stacked active EQ, supplied as a full installation kit with the wiring layout configured to feed the EQ from either passive HZ or active EMG pickups. The kit contains the stacked bass/treble and mid pots, the EQ circuit board, the solderless quick-connect harness with the HZ-compatible input network, the output jack and the battery connector. A single 9V battery powers the EQ; the HZ pickups themselves remain passive. The HZ designation marks out the same difference seen across the BQC-HZ, BTC-HZ and BTS-HZ siblings. EMG's passive HZ pickups produce a higher-impedance signal than the active and X-Series ranges, so the EQ stage needs an input network that loads the HZ coils correctly without dulling the top end. The BQS-HZ harness adds that loading network and lets the EQ see the right source impedance whether the player is feeding it HZ pickups, active EMGs, or a mix of both. Best suited to bass and guitar builds running EMG HZ pickups where the player wants three-band shaping in the compact two-knob stacked format that frees up cavity real estate on Strat-format and offset builds, or to mixed setups combining a passive HZ pickup at one position with an active EMG at another. Pairs naturally with the 35HZ, 40HZ and 45HZ bass soapbars, the F-H and H passive guitar humbucker families, and the Alexi Laiho HZ pair. Complete installation kit included. Distributed in the UK by Selectron.