The Alice 505 Baxandall Stereo EQ is a sophisticated equalizer designed to sweeten the sound of audio signals in the tradition of Peter J Baxandall’s original 1950s circuitry. Here are the key features and technical specifications that define the capabilities of the Alice 505 EQ:
Key Features:
- Historical Context:
- Originating from the movie industry in the USA, equalizers were initially developed to address microphone placement issues and achieve consistent dialogue sounds. The primary purpose was to equalize sounds from different microphones to ensure uniformity.
- Baxandall Circuitry:
- Designed by Peter J Baxandall in the 1950s, whose variations have been widely used by broadcasters and HiFi manufacturers.
- Ted Fletcher’s variations incorporate the original class A circuitry, with modifications to the curve specifically shaped for sweetening final masters.
- Width Control:
- Uses “sum and difference” mode for processing the audio signal to maintain perfect symmetry between the left and right channels.
- The width control allows accurate manipulation of the stereo image width.
- At minimum width, the audio output is mono.
- At halfway, the processing recombines the audio into left and right accurately.
- Increasing the control further extends the stereo image beyond the original.
Technical Specifications:
- Frequency Response:
- 20Hz to 20KHz.
- Line Input:
- 10KHz current-mode transformer balanced.
- Gain:
- Unity.
- High EQ:
- +/- 12dB with shelving at 10kHz.
- Mid EQ:
- +/- 12dB with shelving at 1600Hz.
- Low EQ:
- +/- 12dB with shelving at 100Hz.
- Relative Input Noise:
- Better than -90dB.
- Harmonic Distortion:
- <0.05%.
- Crosstalk:
- Better than -50dB.
- Maximum Output:
- +21dBu.
The Alice 505 EQ, with its historical lineage and advanced design, is a powerful tool for enhancing the audio experience by offering precise equalization and stereo image control. The incorporation of Baxandall circuitry and innovative features makes it a valuable asset in professional audio environments.
