BXPRO550 Stereo Baxandall Equalizer

The BXPRO550 stereo equalizer is indeed based on the Baxandall filter designed in the 1950’s and named after its creator Peter Baxandall.

This type of equalizer circuit now commonly used in audio equipment, Hi-fi manufactures and movie industry. It typically consists of two adjustable frequency bands: bass and treble. These bands allow users to adjust the levels of low and high frequencies independently,
providing control over the tonal balance of the audio signal. The Baxandall filter design is known for its simplicity and effectiveness in shaping the frequency response of audio systems.

BXPRO550 is inspired by the TFPRO™ 505 stereo equaliser module in the 500 series format. This Stereo Equalizer is a versatile audio processing unit designed to provide precise control over the tonal characteristics of stereo audio signals. Featuring three distinct bands of equalization, the BXPRO550 empowers sculpting of the frequency response of audio with ease and precision.

Three-band equalization: The EQ offers three bands of equalization, allowing users to adjust the levels of low, mid, and high frequencies independently.
Baxandall-inspired design: The low and high bands of the equalizer are based on the renowned Baxandall filter design, renowned for its musicality and smooth tonal shaping capabilities. Both of them are Baxandall Shelving filters.
Mid-band flexibility: The mid band of the EQ provides users with versatile control over the mid-range frequencies, offering options for precise adjustments to suit various audio sources and applications. Mid band is a parametric filter.
Stereo operation: The EQ operates in stereo mode, enabling simultaneous processing of left and right channels for coherent stereo equalization.
Character: EQ ensures transparent and musical sound shaping without introducing unwanted artifacts or distortion.
Intuitive controls: With intuitive control knobs for each frequency band, BXPRO550 makes it easy for users to dial in their desired sound quickly and effectively.

BXPRO550 offers professional-grade equalization capabilities in a compact and user-friendly package. Whether used in recording or home studios or live
sound environments, the BXPRO550 empowers audio professionals and enthusiasts alike in shaping their sound with precision and musicality.

BXPRO550 is absolutely free for Reason users

Device inspired by the TFPRO™ 505 stereo equaliser module, and based on it Alice™ 505 Baxandall Stereo EQ.*

* All product names, artists and bands names, trademarks and registered trademarks are the property of their respective owners.
All company, product and service names used are for identification purposes only. Use of these names, trademarks and brands does not imply endorsement

MAIN CONTROLS

Bands Gain: Unity.

LOW BAND: Baxandall Shelving type filter. Boost or cut low frequency (100 Hz) in range +/- 12dB
MID BAND: Bell type filter. Boost or cut mid frequency (1600 Hz) in range +/- 12dB
HIGH BAND: Baxandall Shelving type filter. Boost or cut high frequency (10 kHz) in range +/- 12dB

WIDTH: EQ operates in stereo mode by default. The stereo image width can be controlled by adjusting the volume level of the ‘difference’ channel. By incorporating a gain control, precise management of stereo width becomes achievable. With the width control set to minimum, the audio output becomes mono. At halfway, the processing accurately reunites the audio into left and right channels. Increasing the control further extends the image beyond the original stereo boundaries

ON (SOFT BYPASS): Soft Bypass with smoothed fade in/out functionality. Button LED light up when fx processing is active.

EQ USAGE

• Adjust the gain controls for each frequency band to boost or cut the desired frequencies according to your audio requirements. The low and high bands utilize shelving filters, while the mid band offers more precise control over a specific range of frequencies.
• Use the overall gain control to adjust the overall output level of the equalized signal, if necessary.
• Monitor the processed audio signal and make further adjustments as needed to achieve the desired tonal balance and sonic characteristics.
• Engage the bypass switch to compare the equalized signal with the original unprocessed signal and make further adjustments as necessary.

Tips for Optimizing TFPRO 505 EQ Module Performance:

Understanding Frequency Bands:
Familiarize yourself with the frequency ranges and characteristics of the low, mid, and high bands. This knowledge will enable you to target specific areas of the audio spectrum more effectively.

Start with Flat Settings:
Begin by setting all EQ bands to their neutral, flat positions. This allows you to listen to the unaltered audio signal and make informed decisions about where adjustments are needed.

Use Subtle Adjustments:
Make subtle adjustments to EQ settings to avoid over-processing the audio. Small changes can have a significant impact, so listen carefully and make adjustments incrementally.

Focus on Problem Frequencies:
Identify problem frequencies or areas of the audio spectrum that need attention. Use the EQ bands to gently boost or cut these frequencies to achieve a more balanced sound.

Use High-Quality Monitoring:
Monitor your audio signal using high-quality speakers or headphones to ensure accurate representation of the sound. This helps you make more informed decisions when shaping the audio with the EQ.

Experiment with Mid-Band:
Adjust the mid band to control specific frequencies more precisely or more gradual.

Bypass for Comparison:
Use the bypass function to compare the EQ’d signal with the original unprocessed signal. This allows you to hear the difference the EQ adjustments are making and fine-tune your settings accordingly.

Consider Stereo Imaging:
Utilize the sum and difference processing capabilities of the BXPRO550 EQ module to control stereo width. Adjust the volume level of the ‘difference’ channel to manipulate the stereo image width, creating a more spacious or focused soundstage.

Document Settings:
Keep track of EQ settings used for different audio sources or projects. This allows you to recreate successful EQ configurations and maintain consistency across your audio productions.

Trust Your Ears:
Ultimately, trust your ears when making EQ adjustments. While technical knowledge is valuable, listening carefully to the sound and making adjustments based on what you hear is key to achieving optimal results with the BXPRO550 EQ.

UPDATE 1.0.2

• Stereo Width CV bugfix

UPDATE 1.0.1
- Minor GUI fixes
- Initial release