2hp Q (2013–2023)

A tiny quantizer that became a cult favorite for its musicality, compact size, and surprisingly deep control over pitch intelligence.

Overview

A 2hp Q barely weighs anything. It is just 2HP wide, one of the narrowest intelligent modules in Eurorack, and it turns chaotic voltage streams into musically coherent notes. You patch in a pitch CV, tell the Q what scale you're in, and the drifting, atonal sequence from your random generator starts sounding like it belongs in a song. It doesn't only snap to chromatic. It handles modes, pentatonics, whole tone, octatonic, and more - 11 scales total. There are no menus, no OLED screens, no firmware updates. Just two knobs, a button, and a few LEDs that glow like embers in a dark rack.

The Q was originally released in 2013, when Eurorack was exploding in popularity but still fighting for space. Racks were filling up fast, and every HP mattered. 2hp, the company, built its reputation on minimalism - one thing done well in the smallest possible footprint. The Q fits that. It doesn't generate sound, shape it, or modulate it directly. It translates between the analog world's raw voltage and the ear's need for tonal logic. It's the kind of module you don't notice until it's gone, and then your sequences sound like they've lost their compass.

Some quantizers offer microtuning, scale editing, or MIDI integration. The Q keeps it simple. Scale selection is fixed via the front panel, so no patching is required to change modes. Rotate the knob, click through the options, and the LED ring confirms your choice. The amount of quantization is also adjustable, from full snap-to-scale to a looser tracking that lets some of the original pitch drift through. This isn't a module for academic microtonal exploration. It's for getting a bassline to lock in, making a melody feel intentional, and taming the chaos without sterilizing it.

Specifications

Key Features

Surgical Scale Intelligence in Minimal Space

The scale set is the Q's core strength. These aren't theoretical modes pulled from a textbook. They're practical scales that show up in real compositions. For a haunting minor progression, switch to Aeolian. For a jazz-inflected line with altered tones, try the octatonic (diminished) scale. For ambient textures, whole tone gives dreamlike, directionless harmony. There's no programming and no deep menus, just rotate and play. The LED ring around the scale knob pulses softly to confirm your selection, which helps a lot in a dark studio.

Adjustable Quantization Strength

Most quantizers are all or nothing. Either the input voltage snaps rigidly to the nearest scale degree, or it doesn't quantize at all. The Q has a continuously variable quantization strength knob. Turn it down, and the module applies a gentler correction, letting some of the original pitch's character bleed through. This helps with slow-moving sequences or modulated pitch sources where you want the tonal center to hold but not sound robotic. At 50% strength, for example, a slightly flat input might end up slightly sharp after quantization, adding a subtle wobble that feels organic. It's a small feature, but it makes the Q a textural tool as well as a corrective one.

Passive Voltage Processing, No Internal DAC

The Q operates entirely in the analog voltage domain. It doesn't convert incoming CV to digital, process it, then convert back. It uses a microcontroller to interpret voltage levels and apply correction via analog switching and scaling. This keeps the signal path clean and avoids the latency or artifacts that can come with full digitization. There's no lag between input and output, no clocking artifacts, no jitter. It behaves like a precision resistor network with intelligence. It also plays well with other analog modules, especially those that rely on smooth voltage curves like envelope followers or LFOs.

Historical Context

When the 2hp Q launched in 2013, Eurorack was shifting from boutique curiosity to mainstream adoption. Builders and musicians were filling their racks with oscillators, filters, and sequencers, but many found that their creations lacked musical coherence. Random voltage sources were fun, but without tonal grounding they often sounded like noise. Quantizers existed, but most were wide modules with complex interfaces or digital displays that felt out of place in minimalist setups. The Q solved a real compositional problem without demanding rack space or cognitive overhead.

It wasn't the first quantizer, nor the most feature-rich, but it was the first to make intelligent pitch correction feel like an almost invisible part of the signal chain. Its success influenced a wave of compact utility modules from other manufacturers. Competitors like Intellijel, Make Noise, and Mutable Instruments offered more advanced quantization options, but none matched the Q's combination of size, simplicity, and musicality. It became a staple in travel racks, DIY builds, and minimalist setups where every HP had to earn its place.

Collectibility & Value

As of 2023, 2hp announced the discontinuation of the Q, citing component shortages and a strategic shift toward new designs. That has made the module sought after, especially in clean, fully functional condition. Used units typically sell between $120 and $180, depending on wear and seller reputation. NOS (new old stock) modules, still sealed in original packaging, occasionally appear on eBay or Reverb for $200 or more, though these are rare.

The Q has no known chronic failure points. It uses a sturdy microcontroller and high-quality passive components, and service technicians observe that units from the early 2010s continue to perform reliably. The small PCB and tight component layout make repairs difficult for non-specialists, though. If the microcontroller fails (a rare occurrence), replacement requires precision soldering and firmware flashing, so leave it to experienced technicians. The most common issues reported by owners are bent pins on the power connector and worn detents on the rotary encoder. Both are repairable, but can be finicky because of the module's size.

When buying used, check that the LED ring illuminates evenly and that the scale knob cycles through all 11 options without skipping. Test the quantization strength knob with a slow voltage ramp to make sure the transition from unquantized to fully quantized output is smooth. Also verify that the output tracks 1V/Octave accurately across the full range. Some early units had slight calibration drift, though this can usually be adjusted via internal trimmers.

For those building a vintage Eurorack system, the Q remains a smart investment. It's not flashy, but it quietly improves everything it touches. Don't expect firmware updates or expandable scale lists. What you get is what it does.

Market Value

┌──────────────────────────────────────────────────────────────────────────┐
│ 2HP Q                                                           Nov 2026 │
├──────────────────────────────────────────────────────────────────────────┤
│ High      $580                                    Latest            $299 │
│ Median    $113                                    Trend                — │
│ Low       $33                                     Volume           ~7/mo │
├──────────────────────────────────────────────────────────────────────────┤
│   $600 ┤                                                                 │
│        │                                           .      .              │
│        │                                                ..               │
│   $343 ┤                                 .                               │
│        │                                                                .│
│        │                                 ..            .            .    │
│        │                                                           .     │
│     $0 ┤.              .    . .         ..           .    . .            │
│        ├─────────────────────────────────────────────────────────────────│
│    vol │▂              ▂    ▅ ▂         ▂█▂        ▂ ▂ ▂▂▂▅ ▅      ▂▂   ▂│
│        └─────────────────────────────────────────────────────────────────│
│         2026-01                      2026-03                      2026-04│
└──────────────────────────────────────────────────────────────────────────┘

Similar items on eBay

Recently sold on eBay: $40–$499 (median $113, based on 22 completed sales, past 12 months)

No exact 2hp Q listings are live right now — these searches show current 2hp and similar vintage synth gear on eBay:

As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.

Related Models

• 2hp DC
• 2hp Fold
• 2hp LPG V2
• 2hp Rash
• 2hp VCM
• 4ms Dual VC Octave Switch
• 4ms LD
• 4ms modules
• 4ms Ping
• 4ms row-power-35