Bartolini 6-Str P4 Soapbar Bridge BK

I spent several weeks swapping the EMG 45Hz into my six-string project bass to see how a passive HZ-series soapbar would sit against active systems and modern soapbars - I wanted warmth without sacrificing clarity. My use case was a gigging multigenre player who needs a full low end for rock while retaining a touch-sensitive midrange for fingerstyle and light slap work.

First Impressions

The pickup arrived as a single extended soapbar with a matt finish and the familiar EMG logo, and immediately felt solid in the hand - heavier than some cheap soapbars but not overbuilt. The included solderless Quik-Connect kit and prewired pots made the drop-in swap quick, and the 4.5 inch (115 mm) housing matched my bridge spacing without awkward gaps. Out of the instrument it looked restrained, but once strung and set up I noticed a rounded, warm character with a softer attack than active EMG models I usually play.

Design & Features

The 45Hz uses EMG's HZ-series construction - a passive, dual-coil soapbar built around a Ceramic/Steel -C/S- magnet arrangement which gives the pickup a slightly warmer, mid-forward voice than a straight ceramic design. The extended housing covers common six-string spacing and the unit is fully shielded with EMG's five-wire Quik-Connect output so you can reconfigure wiring without soldering. EMG ships the unit with a basic wiring kit that includes a 250k volume and 250k tone pot, output jack, mounting screws and a bridge ground plug so the installation is truly plug-and-play for most route-compatible instruments.

Playability & Installation

Installation was straightforward on my bass - the pickup footprint is the extended 4.5 inch size, so it fit a wide range of six-string cavities without extra routing on many modern bodies. The solderless connectors worked as advertised, though the small pins demand a steady hand when seating them; once connected I tested a few wiring options and found the prewired tone control useful for taming the top end. Physically the pickup sits low enough to avoid string rattle while allowing normal action, and I had no buzz or grounding problems after following the recommended bridge ground hookup.

Sound Character

Sonically the 45Hz is warm and rounded with a soft, mellow attack - it emphasizes the mids and gives the low strings a pleasing weight without flubbing the upper register. Fingerstyle players will appreciate the thick, singing low B without the glassy top-end you get from many active or ceramic-only designs, while rock players will find it sits nicely in a mix where mids help the bass be heard through guitar-heavy arrangements. It is not the most aggressive modern-sounding pickup - there is less of the compressed, hi-fi sheen of active preamp models - but I liked how the notes bloom rather than punch immediately, which suits vintage tones, root-note playing, and a more organic band sound.

The Trade-Offs

The warm, mid-rich presentation is also the 45Hz's main limitation - if you need razor-sharp, slappy treble or the tight, scooped low-end that active EMGs are known for, this passive HZ will feel softer and less defined. Some players may also need to use EQ to bring out clarity for very fast picking or complex chordal work. Finally, while the solderless kit is convenient, the installer must be careful with the small connectors - an inexperienced hand can struggle to get a clean connection, and certain vintage routed cavities may still require modification for the housing length.

Specs & Technical Notes

Model: 45-HZ - Passive dual-coil soapbar designed for 6-string basses; Magnet Type: Ceramic/Steel (C/S); Housing length: approximately 115 mm (4.5 inches); Maximum string spacing: about 95.25 mm (3.75 inches). Electrical: Inductance 3.62 Henries (wired in series), DC resistance ~11 kOhm, resonant frequencies reported near 2.40 kHz and 4.05 kHz with impedance values at resonance in the tens of kOhms depending on load. Included in the box is EMG's solderless install kit - 250k volume and tone pots, mono output jack, pickup cable, connection cables, mounting screws and bridge ground wire - and the unit is made in USA.

Real-World Experience

I used the 45Hz across rehearsal, a small club gig, and a bedroom recording session - in rehearsal it cut through guitar layers better than I expected thanks to the mid presence, and in the club the low end stayed solid without getting woolly. For DI tracking I found it sat well with a gentle high-shelf boost to add definition to slap-style passages, while overdriven DI tones picked up pleasant harmonic grit without harsh fizz. The pickup behaves predictably across different amps and cabs - it doesn't demand heavy EQ chains and responds well to instrument-level tweaks and playing dynamics.

Final Verdict

The EMG 45Hz is an excellent passive option if you want a warm, vintage-leaning soapbar that works with six-string spacing and avoids the compressed sheen of active pickups. I recommend it for players seeking a fat, mid-forward tone for rock, classic styles, and fingerstyle work where note bloom and body are priorities; active-heads or slap specialists might prefer a different flavor. Considering build, sound, and the convenience of the solderless kit, the 45Hz represents a solid value for modern 6-string setups that need character over clinic-like precision.