Chameleon Labs 7721


Enter your email address to be notified when this item is in stock.

Adding to cart… The item has been added
More On The Way, Get In Line For Our Earliest Ship Time

Stock Item: Ships from our shelf quickly in almost all cases when ordered before our ship cutoff times.

Direct Ship: Non-stock item, but normally ships quickly from the manufacturer or alternate warehouse.

Built To Order: Item is custom built per the options chosen and quickly shipped out upon completion.

More On The Way: The manufacturer is experiencing delays, but we'll ship quickly upon arrival.

New Item: We have this on order, the manufacturer hasn't shipped but you'll be in line upon arrival.

Visit our Shipping Page for cutoff times for FREE (USA), UPS, USPS or FedEx.

Visit our Returns Page for info on non-returnable, special order non-stock items.

Be among the first in line, pre-order now and we will not charge your payment until shipment is confirmed. Current estimated arrival date is Feb 28, 2022.

Chameleon is back with an all new VCA style buss compressor!

When designing the 7721, Chameleon’s engineers started with a clean sheet of paper and deeply evaluated the details associated with developing a bus compressor for the modern studio. Basing detection and voltage control on a voltage control amplifier (VCA) topology and designing a circuit that provides low noise and transparency the team created an acoustic “glue" that is capable of consistently delivering punch and loudness to the signal.

Unlike most compressors currently available, Chameleon have added an Input Gain stage which allows you to effectively adjust the level of the source signal. This allows you to effectively establish the relationship between the Threshold level and music signal in the box.


  • Stereo compressor with VCA-based signal detection
  • Super low noise, IC based input section
  • Side chain input allows a seperate source to be used as the compression trigger
  • IC based, ultra-low noise output stage
  • VU meter for Input / Output Level and Gain Reduction monitoring
  • Super low noise internal power supply
  • Selectable high pass filter
  • Threshold, Attack, Release and Ratio controls
  • Selectable detection type Peak or RMS
  • Selectable compression types: Soft or Hard Knee
  • Blend control allows you to mix the compressed audio signal with the original signal


  • User Controlled Functions
  • On Switch:Turn Unit On - VU Meter Light is ON
  • Compression:Insert compression circuit or bypass
  • Side Chain:Use Side Chain Input for triggering
  • Compression:Soft or Hard knee compression type
  • Input Gain:Input buffer stage gain control
  • Detection:Peak or RMS
  • High Pass Filter:60, 90, 130 or 200 Hz high pass filter applied to Side Chain detection signal
  • Threshold:Applied between -15dB and +15dB
  • Attack:Attack time in milli seconds - .1 / .3 / 1 / 3 / 10 / 30
  • Release:Release time in seconds - .1 / .3 / .6 / 1.2 / 1.5
  • Ratio:Compression ratio selection 1.5 / 2 / 4 / 8 / 10
  • Blend:Full Dry equivalent to 0% compression, Full Wet equivalent to 100% compression
  • Output Gain:-60dB to +20dB Output Level control
  • VU Meter controls (L&R):In - Input / Out - Output / GR - Gain Reduction
  • Input Connectors
  • Input (Female XLR):50 kΩ
  • Side Chain Input (Female XLR):50 kΩ
  • Output (Male XLR):200 Ω
  • Audio Specifications
  • Noise Specification:<-100dBu Input Terminated with 600 Ω, compressor ON and Output Gain set to 0dB
  • Frequency Response:20Hz - 20kHz +/- 0.25dB
  • Headroom:> 20dB output level
  • Dynamic Range:100 dB per AES17 Standard
  • Common Mode Rejection:100Hz - 10kHz >90dB
  • Input and Output Impedance:>10kΩ / <50 Ω
  • Indicators
  • Red Input Gain:Input Overload
  • Red Output Gain:Output Overload
  • Power Supply:100V - 240V (50/60Hz)
  • Switch mode power supply, fully shielded 3 amp peak output capability, quiescent consumption 0.5 Watts

1RU Steel enclosure
Aluminum front panel
Laser etched graphics
Milled aluminun knobs

Our ONE WITH EVERYTHING ZEN WARRANTY extends the standard manufacturer warranty by one year, see our ZEN WARRANTY page for details.