Heritage Audio Grandchild Compressor

Heritage Audio Grandchild 670 - A Compact Tube Vari-Mu Stereo Compressor for 500 Series

The Heritage Audio Grandchild 670 is a groundbreaking addition to the 500 series format, bringing the esteemed characteristics of tube Vari-Mu compression into a compact module. This unit is a marvel of engineering, offering the warm, intimate sound characteristic of classic tube compressors in a two-space 500 series module, making it an exceptional choice for any studio seeking that elusive, vintage tonal quality.

Key Features:

• Tube-Driven Sound: Packed with 4 NOS 6BA6 (5749) tubes and three custom-designed transformers, the Grandchild 670 delivers a lush, warm, and hugging sonic character.
• Flexible Controls: Features INPUT GAIN control with a 20dB range, AC and DC Thresholds for detailed dynamic control, and 5 selectable Attack and Release times.
• Unique Progressive Ratio: Offers a progressive ratio curve adjustment, blending hard limiting to smooth, transparent light compression.
• Sidechain High-Pass Filter: Includes a 3-position high-pass filter on the sidechain to reduce low-frequency influence on the compression detection circuit.
• Stereo Operation: Designed as a stereo unit, ensuring consistent gain reduction across both channels for a stable stereo image.
• Elegant Metering and Design: The front panel boasts a beautiful VU meter for gain reduction metering and a 3-position Active/Bypass/Off switch, all within an attractive, vintage-styled chassis.

Specifications:

• Input Impedance: 15 kΩ
• Output Impedance: 50 Ω
• Max Output Level: +29 dBu
• Frequency Response: 20 Hz to 20 kHz ± 0.5 dB
• Self Noise: Less than -78 dBu
• Harmonic Distortion: Less than 0.5% up to +24 dBu output (no compression)
• Dimensions (W x H x L): 180 mm x 133 mm x 75 mm
• Weight: 1.120 Kg
• Power Consumption: Slightly over 200mA per rail per slot (+16V/-16V)

The Heritage Audio Grandchild 670 is not just another addition to your rack; it's a statement piece that brings the revered sound of vintage tube compression into the modern studio in a compact and accessible format.