The DSM & Humboldt Electronics Sub-Atomic X-Over Cmos Bass Preamp is a Dsm Humboldt Electronics preamp pedal, currently around $259. Close alternatives include the Ashdown James LoMenzo Mega Drive and the EarthQuaker Devices Scrolls V1. It pairs well with the JHS Smiley and the Electro-Harmonix 1973 Violet Ram's Head Big Muff Pi V2.

DSM & Humboldt Electronics Sub-Atomic X-Over Cmos Bass Preamp

Dsm Humboldt Electronics · pedal

The DSM and Humboldt Electronics Sub-Atomic X-Over CMOS Bass Preamp is a dedicated bass crossover preamp pedal using CMOS circuitry to split the bass signal into high and low frequency bands, processing them independently for separate drive and tone shaping. The crossover design allows overdrive to be applied to the high-frequency content while the low-frequency fundamental remains clean, preserving bass definition and punch while adding harmonic distortion character to the upper frequencies. Made by DSM and Humboldt Electronics for professional bass applications.

What stands out

  • “The crossover design preserves the low-end fundamentals that conventional bass overdrive loses when applied full-range”

    — from the community notes

  • “CMOS bass preamp with crossover frequency splitting that processes high and low frequencies independently, allowing overdrive on the upper frequencies while preserving the clean low-frequency fundamental for bass definition”

    — from the community notes

  • “The crossover design allows overdrive to be applied to the high-frequency content while the low-frequency fundamental remains clean, preserving bass definition and punch while adding harmonic distortion character to the upper frequencies”

    — from the listing

  • “The practical result is overdrive-enriched harmonic content in the upper register while the bass fundamental retains its punch and definition in the mix”

    — from the reviews

  • “Made by DSM and Humboldt Electronics for professional bass applications”

    — from the listing

Trade-offs

  • “most drive pedals thin the bass low-end when applied full-range”

    — from the reviews

  • bass
  • frequency
  • fundamental
  • overdrive
  • definition
  • harmonic
  • low end
$259View on Reverb

Price updated Oct 24, 2026

Genres the DSM & Humboldt Electronics Sub-Atomic X-Over Cmos Bass Preamp is commonly used in

  • Electronic
  • Metal
  • Rock
  • Experimental
  • Alternative
    citedInferred from shared tonal signals, not a stated genre tag.
  • Blues
    citedInferred from shared tonal signals, not a stated genre tag.

Pedals that stack with the DSM & Humboldt Electronics Sub-Atomic X-Over Cmos Bass Preamp

JHS Smiley

JHS Pedals

19% match

clean platform takes the driveA clean, high-headroom stage takes on dirt it can't generate by itself. (transparent → fuzzy)

Into a transparent tone, JHS Smiley brings a pull toward fuzzy that's missing

Comes earlier in the signal chain

Electro-Harmonix 1973 Violet Ram's Head Big Muff Pi V2

Electro-Harmonix

19% match
$114.30via Reverb

fills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (transparent → mid-forward)

The transparent tone has headroom to spare — Electro-Harmonix 1973 Violet Ram's Head Big Muff Pi V2 leans it toward mid-forward to fill it in

Comes earlier in the signal chain

TC Electronic Mimiq Doubler

TC Electronic

14% match
$85.26via Reverb

sits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.

Keep TC Electronic Mimiq Doubler after DSM & Humboldt Electronics Sub-Atomic X-Over Cmos Bass Preamp in the signal chain, clear of DSM & Humboldt Electronics Sub-Atomic X-Over Cmos Bass Preamp's own gain stage

Comes earlier in the signal chain

Vox Valvenergy Silk Drive

Vox

11% match
$150.36via Reverb

shapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain.

Vox Valvenergy Silk Drive's own smooth character is the real reason this is worth trying

Comes earlier in the signal chain

Strymon BigSky

Strymon

7% match
$679via Reverb

sits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.

Run Strymon BigSky after DSM & Humboldt Electronics Sub-Atomic X-Over Cmos Bass Preamp in the signal chain, clear of DSM & Humboldt Electronics Sub-Atomic X-Over Cmos Bass Preamp's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Comes later in the signal chain

Fender Hammertone Reverb

Fender

7% match
$85.01via Reverb

sits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.

Put Fender Hammertone Reverb after DSM & Humboldt Electronics Sub-Atomic X-Over Cmos Bass Preamp in the signal chain, clear of DSM & Humboldt Electronics Sub-Atomic X-Over Cmos Bass Preamp's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Comes later in the signal chain

Dr. Scientist Frazz Dazzler V2

Dr Scientist

tonal match
$204.36via Reverb

Comes earlier in the signal chain

Into a transparent tone, Dr. Scientist Frazz Dazzler V2 brings a pull toward fuzzy that's missing

Warm Audio Jet Phaser

Warm Audio

tonal match
$109.01via Reverb

Comes earlier in the signal chain

Warm Audio Jet Phaser goes in front of DSM & Humboldt Electronics Sub-Atomic X-Over Cmos Bass Preamp — modulation sits after the gain for a defined swirl

Cheaper alternatives

Ashdown Triple Shot

Ashdown

60% similarity
$154.97via Reverb

Shared character: definition, mix, bass

Boss BB-1X

Boss

52% similarity
$139.07via Reverb

Shared character: standout, mix, bass

Master Effects Manta Ray 2-band Bass Preamp

Master Effects

49% similarity
$125via Reverb

Shared character: bass, clean

Electro-Harmonix Nano Operation Overlord

Electro-Harmonix

48% similarity
$101.40via Reverb

Shared character: definition, mix, bass

Electro-Harmonix Nano Battalion

Electro-Harmonix

48% similarity
$85.36via Reverb

Shared character: bass, definition, overdrive

Dunlop MXR M85 Bass Distortion

Dunlop

46% similarity
$157.32via Reverb

Shared character: mix, bass, distortion

Similar charactersee all similar tone character →

Ashdown James LoMenzo Mega Drive

Ashdown

62% similarity

Shared character: definition, punch, mix

EarthQuaker Devices Scrolls V1

EarthQuaker Devices

58% similarity

Shared character: definition, bass, distortion

Carl Martin Bass Drive

Carl Martin

54% similarity
$291.99via Reverb

Shared character: standout, punch, mix

Mooer MOD2 Rumble Drive

Mooer

51% similarity

Shared character: definition, bass, overdrive

Electronic Audio Experiments Greathammer Bass Driver

Electronic Audio Experiments

51% similarity
$249via Reverb

Shared character: definition, bass, overdrive

Behringer BDI21

Behringer

46% similarity

Shared character: mix, bass, full

See all alternatives to the DSM & Humboldt Electronics Sub-Atomic X-Over Cmos Bass Preamp (cheaper + boutique) →

Questions people ask

What are good alternatives to the DSM & Humboldt Electronics Sub-Atomic X-Over Cmos Bass Preamp?+

The closest matches in character are the Ashdown James LoMenzo Mega Drive, the EarthQuaker Devices Scrolls V1, the Carl Martin Bass Drive. Budget picks: Ashdown Triple Shot, Boss BB-1X, Master Effects Manta Ray 2-band Bass Preamp.

What pairs well with the DSM & Humboldt Electronics Sub-Atomic X-Over Cmos Bass Preamp?+

Strong matches from rig and tone-complementarity evidence: JHS Smiley, Electro-Harmonix 1973 Violet Ram's Head Big Muff Pi V2, TC Electronic Mimiq Doubler — Into a transparent tone, JHS Smiley brings a pull toward fuzzy that's missing.

How much does the DSM & Humboldt Electronics Sub-Atomic X-Over Cmos Bass Preamp cost?+

Around $259 (live listing price, updated Oct 24, 2026).

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