Nembrini Audio Bass 3500 Amplifier [WiN]

• Product: Bass 3500 Amplifier
• Developer: Nembrini Audio
• Version: 1.0.0
• Format: VST2, VST3, AAX
• Requirements: Windows 7 or later
• Source: nembriniaudio.com/products/bass-3500

Bass 3500 is a bass amplifier plugin modeled on the Hartke HA3500’s hybrid tube/solid-state preamp design, built around a continuously blendable Tube/Solid State stage, a pre-amp compressor and four stomp effects, a ten-band graphic EQ with contour controls, four cabinet-and-mic combinations with a parallel D.I. path, a dual IR loader, and a six-band parametric EQ with post-amp effects. A Cabinet Bypass switch removes the cab, mic, and IR section entirely for use with an external cabinet or a real power amp and speaker.

Key Takeaway

Bass 3500 runs on a continuously blendable Tube/Solid-State preamp inside a full pre- and post-cabinet chain — compressor, stomps, dual EQ, cabinet and IR blending — with a Cabinet Bypass switch for running into a real amp and speaker instead. That bypass removes only the cab, mic, and IR stages; the compressor, stomps, and EQ still process the signal downstream.

Blending Tube Into Solid State

The preamp splits into a Tube stage and a Solid State stage blended on a single continuous control rather than switched between the two. Turning the blend toward Tube adds harmonic warmth and a softer transient response at the front end; pushing it toward Solid State keeps more pick or finger attack intact and holds low-end definition tighter. Because the blend is continuous rather than an A/B toggle, a mix between the two — say 70% Solid State for punch with a trace of Tube warmth underneath — is a single knob position rather than two instances run in parallel.

That blend sits ahead of the compressor and stomp chain, so its character shapes everything that follows it rather than acting as an insert that can be moved later in the signal path. A pick-heavy rock bassist chasing maximum attack gets more from leaning Solid State early and adding drive further down the chain; a fingerstyle player chasing a rounder, more forgiving tone gets more from leaning Tube. The tradeoff is that the blend is global to the whole preamp stage — there’s no way to run the Tube and Solid State paths through separate EQ or compression before they combine, the way an actual dual-channel hybrid rig could.

A Compressor Ahead of Four Stomps

The built-in compressor sits early in the signal path, controlling peaks and evening out note-to-note dynamics before the tone-shaping stages get the signal — an activity LED lights to show when compression or limiting is actively engaging, useful for confirming gain reduction on a part where the meter isn’t otherwise visible. Four stomp effects follow it: a Noise Gate for cleaning up between notes, an Envelope Filter for auto-wah movement, an Octaver for adding a sub-octave layer, and a Modern Tubes Drive stage for saturation.

Every stomp, and the compressor’s position relative to them, is draggable and reorderable, so running the Octaver before the Drive stage saturates the added sub-octave along with the fundamental, while running it after keeps the octave layer clean under a driven top end. That reordering is a real workflow choice, not a cosmetic one — a synth-bass patch built from the Octaver plus Envelope Filter reads differently depending on whether Drive sits before or after the filter’s sweep. The four stomps cover a fixed set of effect types; a bassist wanting a fifth stomp type, a pitch shifter or a fuzz distinct from Modern Tubes Drive, doesn’t have a slot to add one into this pre-amp chain.

Fifteen Decibels Across Ten Bands

A ten-band graphic EQ offers ±15 dB of cut or boost at fixed points — 30 Hz, 64 Hz, 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 3 kHz, 5 kHz, and 8 kHz — spaced roughly an octave apart across the range a bass guitar actually occupies. That fixed spacing makes broad tonal moves fast: pulling 250 Hz and 500 Hz down together clears mud from a dense mix pocket in two slider moves rather than sweeping a parametric band to find the right frequency first.

Two Contour controls work alongside the graphic bands — a broad Low Pass centered around 100 Hz and a broad High Pass centered around 10 kHz — shaping the extreme low end and top end without touching the ten fixed graphic points in between. Because the graphic bands sit at fixed frequencies rather than sweepable ones, a resonant problem sitting between two bands — at 400 Hz, say, between the 250 Hz and 500 Hz sliders — can’t be targeted precisely at this stage; that kind of surgical cut has to wait for the six-band parametric EQ later in the chain.

Four Cabinets, Four Mics, One DI Path

The cabinet stage offers four bass cabinet emulations paired with four microphone models, with adjustable microphone positioning and separate tweeter controls for the high-frequency driver some bass cabs carry. Moving the mic position changes proximity effect and off-axis high-end rolloff the way physically repositioning a mic on a real cabinet would, so pulling a mic off-axis softens pick noise and string zing without reaching for the EQ to do it.

A parallel D.I. path runs alongside the cabinet signal, and three ambience environments add room character behind the mic’d tone — blending in D.I. brings back low-end weight and attack a cab-only signal can lose, especially under a mix where the cab emulation alone reads thin. Those combinations cover a wide tonal range for a single amp model, but they stay within cabinets voiced for this specific hybrid amp — a bassist chasing an unrelated cabinet character, an 8×10 fridge stack voiced for a different amp entirely, needs the IR loader instead.

Two Slots for Someone Else’s Cabinet

Two IR loader slots accept third-party impulse responses, each with independent level, pan, phase, Solo, and Mute controls, so a purchased or self-captured cabinet IR can sit alongside — or replace — the four built-in cabinet emulations. Blending two IRs at different pan positions widens the cabinet image the way close-and-room mic blending does on a real recorded cab, and the phase control matters specifically here: two IRs summed out of phase can thin out or cancel low end the same way two real mics on one cab can when they’re not time-aligned.

Solo and Mute per slot make A/B testing two candidate IRs fast without reaching for a separate bypass control on each. The loader accepts two IRs at a time, not more — a bassist wanting to blend three or four captured cabinets simultaneously, the way some dedicated cab-sim plugins allow, is working past what two slots can hold and needs to commit two of them first or run a second instance.

One Switch Removes the Whole Cab Chain

After the cabinet and IR stages, a six-band parametric EQ handles the tone-shaping the fixed-frequency graphic bands upstream can’t — adjustable frequency, gain, and Q per band means the 400 Hz problem the graphic EQ couldn’t isolate gets a precise notch here instead. A Studio Compressor, a bass-optimized Modulation effect, and an Analog Delay follow, each draggable for reordering, giving a second dynamics-and-effects stage positioned after the cabinet color rather than before it.

Cabinet Bypass removes the entire cabinet, recording chain, and IR loader section in one switch, which matters specifically for a rig running Bass 3500 purely for its preamp, EQ, and effects while sending the resulting signal to a real power amplifier and bass speaker, or to a separate IR loader or cabinet plugin downstream. With the bypass engaged, none of the four built-in cabs, the four mic models, the D.I. blend, the ambience environments, or the two loaded IRs are part of the signal — the six-band EQ and post effects still are, since they sit after the bypass point in the chain. A bassist running a hybrid rig — modeled preamp into a physical cabinet — gets a direct handoff point built into the plugin instead of disabling each cabinet-stage control individually.

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