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Serpent SB4001 500 Series Stereo Buss Compressor

500 Series Stereo Bus Compressor with 6 Ratios, 10 Attack Times, Highpass/Boost/Slope Sidechain Filters, and Grind Mode
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Item ID: SB4001
Serpent SB4001 500 Series Stereo Buss Compressor
Price:$1,349 and 00 cents
Special Financing - Ends Aug 2, 2026. $38/month with 36 month financing*

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Serpent SB4001 500 Series Stereo Buss Compressor
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Price:$1,349 and 00 cents
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This article was Written By

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Masterful Stereo Bus Compression

Great-sounding stereo bus compression is a must-have. It pumps up your mixes, giving them the glue, punch, weight, authority, and slam factor to stand out from other tracks being broadcast or streamed. If most other engineers are using it (trust us: they are) and you're not, your mix (no matter how good) will sound weak in comparison. So Sweetwater's advice is to have the best-sounding, most versatile bus compressor you can find strapped across your stereo mix bus. Enter the Serpent SB4001 500 Series stereo bus compressor.

Delivers whatever sound you're after

The Serpent SB4001 raises the bar for the 500 Series stereo bus compression. With its Quad VCAs, six ratios, 10 attack times, highpass/boost/slope sidechain filters, Wet/Dry Blend control, external (key) input, classic stepped release settings, classic (A1) and alternate (A2) auto release, and variable Release control, as well as Grind mode (a proprietary tube-style harmonic drive that adds vintage coloration), the SB4001 can deliver whatever sound you're after. Whether clean, dirty, vintage, subtle, or crushed, the SB4001 is sure to be one of the most flexible compressors in your arsenal.

Serpent SB4001 500 Series Stereo Bus Compressor Features:

  • Quad VCAs (for superior dynamic range)
  • Electronically balanced
  • True bypass (relay controlled)
  • Protection from 48-volt phantom power
  • Powder-coated front panel for extra durability
  • Thru-hole main audio path
  • Ratios: 1.5, 2, 4, 6, 8, 10
  • Attack times (stepped): 0.1, 0.3, 1, 3, 5, 10, 15, 20, 25, 30, 40, 50µs
  • Release times (stepped): 0.3, 0.6, 1.2ms, classic auto release (A1), alternate auto release (A2)
  • Release times (variable; engaged by last position on stepped switch): any time from 0.1 sec to 1.2 sec
  • Sidechain filters: 60Hz, 90Hz, 120Hz, Boost mode, Slope mode
  • Wet/Dry Blend (for parallel processing)
  • Grind mode: special valve-style harmonic drive mode that adds vintage coloration
  • External/Key Input accepts balanced or unbalanced inputs (inserted before sidechain filters)
  • Gain (-6dB to +18dB)
  • Premium sealed pots and Grayhill rotary switches
  • All-machined aluminum knobs
  • Handcrafted in Philadelphia, PA

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Tech Specs

  • Processor Type: VCA Compressor
  • Number of Channels: Stereo
  • Controls: Threshold, Ratio, Attack, Release, Blend, Gain, Filters, Variable Release
  • Threshold: -20dB to +20dB
  • Ratio: 1.5:1 to 10:1
  • Frequency Response: 20Hz-20kHz (±0.11dB)
  • Sidechain I/O: 1 x 1/4" (key input)
  • Side Chain Inserts: 60Hz, 90Hz, 120Hz, Boost Mode, Slope Mode
  • Features: Quad VCA Gain Reduction
  • Bypass: True bypass
  • Module Slot Size: Double
  • Power Usage: ±16V DC
  • Manufacturer Part Number: SB4001

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Reviews

Better than SSL
I love the Wet/Dry parallel compression feature. One of the few 2 slot true stereo compressors out there. Love it
Amazing compressor!
I absolutely love this thing. It performs amazing as a buss compressor and for anything you throw at it. This thing can be very transparent or warm depending on how you use it. The wet knob Is wonderful for parallel compression. I use it on everything!!!