Moog - 500 Series Ladder Filter

Item # SYS500LAD
| Mfg # 500LAD
| UPC #
Our Price: $699.00
Retail: $799.00 | You Save: 12%
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*****5 / 5 (based on 1 Reviews)
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The Ladder is a Dynamic Transistor Ladder Filter that is based on Bob Moog's original ladder filter designs. Don't be fooled by its small size, The Ladder is a powerful and fantastic sound sculpting tool that allows for creative and unique sound shifting and shaping. By design, The Ladder sports the smoothest all analog Low Pass and High Pass filter section. Simply adjust the Cutoff knob to add vibe, warmth or tonal adjustment.  Choose LP to add analog vibe and warmth to a sound or select HP for sweetening and relieving the heft of a sound.

 The Envelope section of The Ladder is where things get really cool:

 - Variable Attack and Release controls allow you to perfectly dial in the behavior of The Ladder's envelope section. Use these controls to open and close the envelope as fast as lightning, or slow as molasses.

 - Use the Amount control in Positive or Negative mode for mild to extreme sound shaping and manipulation. From slight timbral excitement and voicing to extreme compression-like behavior. Even reversed filter action is achievable!

 - The Resonance control used with The Ladder’s other features allows for the creation of sweet, dynamic and even speech like behavior. Use it to tune The Ladder to a sound source… or not. You can excite or accentuate specific frequencies as well as create completely new unique and wild sounds.

NOTE: The Ladder's Resonance control will push the unit into self-oscillation. This can be used for effect if desired.

The 2Pole/4Pole switch allows you to select how aggressive your filter slope is. 2 pole is equal to 12db per octave which is smooth and sweet, while 4 pole is 24db per octave which is hard and aggressive.

You also have a hard wire Bypass for totally transparent routing and A/B comparison

The Ladder isn't your average filter. It's a big step up


  • Audio I/O: Balanced line level via 500 rack. +19dBµ to -16dBµ input accepted.
  • Filter Type: 2 and 4 pole dynamic low-pass & high-pass transistor Ladder Filter
  • Envelope Type: RMS detector, bi-polar with variable attack & release
  • Attack time:    Better than 250µS to 2.0 seconds depending on program material and level.
  • Release time:  Better than 150mS to 2.0S depending on program material and level.
  • Envelope Control: Positive and Negative Modulation
  • Input Impedance: Nominally 24KΩ balanced differential, 12KΩ unbalanced single ended.
  • Output Impedance: Nominally 50Ω  differential 25Ω single ended.
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Product Reviews
  • *****
  • Awesome
  • May 11, 2015
  • By: Andy

This 500 series module is a must-have. You get the famous Bob Moog ladder filter, which can be used as low-pass or hi-pass, and 2-pole or 4-pole. It is a great addition to any instrument; keyboards, bass drums, guitar, horns, and more. Variable attack and decay, as well as the great analog Moog drive circuit. It can be used for subtle tone shaping or self-oscillating for a far-out effect.

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Product Warranty Information

  Product warrenty information

All instruments in our catalogs and on our shopping site carry the manufacturers' warranties against defects in parts and workmanship. Should a defect occur within the manufacturer's warranty period, contact us immediately.

We will be glad to help facilitate the repair or replacement as specified by the manufacturer. The manufacturer will determine whether the defect is covered under their warranty; we do not make that determination.

Please note: U.S.-based manufacturers WILL NOT honor warranties for items sold and shipped outside the U.S. Also, if a school, school district, or board of education purchases an instrument and resells it to an individual, the manufacturer considers the warranty to be void. Warranties are extended only to the original purchaser!

All warranties, stated or implied are held with the product manufacturer and they vary from item to item. Consult the documentation that came with your product for details in addition to the information below.
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Robert Moog's original company was founded as R.A. Moog Co. in 1953, manufacturing theremin kits and modular synthesizer systems, producing some of the most popular synthesizers of all time. Today's Moog gives you sounds not possible anywhere else. 
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