Antelope Audio Tubechild 670
Precise Peak Limiter

1. Introduction

2. Features

• ビートルズなど数え切れないほどのアーティストによるレコーディングセッションに使用されたクラシックバルブコンプレッサー
• Pristine sound devoid of audible thumps, distortion and noise.
• Extremely fast attack time — Tubechild 670 は、1/10,000秒単位で圧縮とリミッティングを行います。
• 6つの異なるタイミング・カーブがリリース時間を可変にし、知覚できない厳しいリミッティングが可能になります。
• コンプレッサーとリミッターの両方として機能します。

3. Specifications

Output Level
+4 or +8VU (+27 dbm clipping point)

Gain
7dB (no limiting)

Frequency Response
40Hz to 15kHz +/- 1dB

Noise Level
70 db below +4dBm

Harmonic Distortion
Less than 1% at any level up to +18dBm output (no limiting)
Less than 1% at 10dB limiting and +/- 12dBm output

Attack Time
0.2 milliseconds in positions 1, 2, and 6
0.4 milliseconds in positions 3, 4, and 5

Release Time (from 10 dB of limiting)
Position 1: 0.3 seconds
Position 2: 0.8 seconds
Position 3: 2 seconds
Position 4: 5 seconds
Position 5: 2 seconds for individual peaks, 10 seconds for multiple peaks
Position 6: 0.3 seconds for individual peaks, 10 seconds for multiple peaks, 25 seconds for consistent program level

Compression Ratio
1:1 to 1:20 above the predetermined level (factory-adjusted to +2 dBm)

4. Quick Start

1. Load Tubechild 670 on the desired audio channel.
2. Set Input Gain to 10 (that’s unity gain).
3. Set Time Constant to 3. *
4. Turn the Threshold control clockwise or counterclockwise until a desired amount of limiting or output level is achieved.

* This is a general purpose starting point. Positions 1 and 2 are recommended for uptempo music or speech. Position 4 is suggested for classical music. Positions 5 and 6 combine fast release with slow release and are useful for great amounts of automatic level corrections. They also make limiting the least audible as they reduce overall level.