Technical glossary

Genelec Proprietary Technologies

Genelec AutoCal™ is an acoustical measurement and design tool built in the GLM and GLM.SE software that utilizes built-in test signal generators inside every Genelec DSP loudspeakers to acoustically measure, optimize and align all loudspeakers in a loudspeaker system.

Genelec AutoPhase™ is a part of Genelec AutoCal™ loudspeaker system calibration tool. It aligns the crossover phase of the subwoofer(s) in the system with the designated loudspeaker(s).

Genelec AccuSmooth™ is a proprietary frequency response smoothing algorithm that provides a higher resolution (narrower smoothing bandwidth) at low frequencies compared with the standard 1/3 octave smoothing, and similar resolution at high frequencies. This is used by AutoCal to ensure accurate placement of equalizing notch filters at critical/problematic bass frequencies.

Directivity Control Waveguide™ (DCW™)
Genelec’s revolutionary Directivity Control Waveguide™ (DCW™) technology first developed in early 80’s can greatly improve the performance of a direct-radiating multi-way loudspeaker. The DCW waveguide is designed to match the frequency response and directivity characteristics of the drivers in the loudspeaker. This results in an excellent flatness of the overall frequency response for on and off-axis listening positions.

GLM™ and GLM.SE™ Control Networks
The GLM™ (Genelec Loudspeaker Manager) and GLM.SE™ (Genelec Loudspeaker Manager for Small Environments) control networks are proprietary Genelec networking technologies that allow setting, reading and monitoring of loudspeaker and subwoofer settings in the loudspeakers on the GLM / GLM.SE network. System setup can be achieved very rapidly by simply opening a System Setup file, which causes all system settings to be adjusted and all loudspeaker-level settings to be automatically communicated and set in all loudspeakers.

Iso-Pod™ (Isolation Positioner/Decoupler™)
The Genelec Iso-Pod™ stand eliminates coloration in the sound by decoupling the loudspeaker from its mounting surface. It also allows the loudspeaker to be angled so that its acoustic axis points directly at the listener.

Laminar Spiral Enclosure™ (LSE™)
The 7000 LSE™ Series subwoofers feature the innovative Genelec Laminar Spiral Enclosure™ bass reflex cabinet. The LSE design provides excellent laminar air flow characteristics in the highly efficient reflex port with minimal turbulence noise. This enables optimal packing of a very long and efficient reflex tube into a small space.

Minimum Diffraction Enclosure™ (MDE™)
In order to improve the flatness of the frequency response and the power response, Genelec have designed a highly innovative enclosure optimized to match the properties of the loudspeaker drivers, featuring rounded edges, and gently curved front and sides. In addition to achieving an unsurpassed flatness of the frequency response, the enclosure having minimum diffractions yields superb sound stage imaging qualities.

A method of spatial averaging used in AutoCal acoustical measurements, used when optimizing the Acoustical Settings of Genelec DSP loudspeakers.

A measurement taken in the main monitoring position used by AutoCal when optimizing the Acoustical Settings of Genelec DSP loudspeakers.

Audio & Physics Terminology

Active Crossovers
An active crossover is an electronic crossover having well-defined and precise frequency responses unchanged by the signal level or power loading of the loudspeaker, unlike the frequency responses in a traditional passive crossover. They operate at signal levels suited to power amplifier inputs and can have analog or digital signal processing.

A-weighting is related to measuring the sound pressure level. Because the human hearing system is more sensitive to some frequencies (500 Hz…8 kHz) than others (very low or very high frequencies), A-weighting defines a frequency-dependent method to scale the sound level measurement to calculate a value representing the subjective impression created by sound at various frequencies.

Bass Management
Bass management is a method to reproduce the lowest frequency content in audio channels using one or more subwoofers instead of loudspeakers. This audio can be the low frequency content in the full-bandwidth audio channels. Parts of the entire LFE audio channel can also be bass managed. Bass management provides several benefits including higher sound output capability and better control of the acoustical environment to improve the quality of reproduction.

Decibel (dB)
The decibel (dB) is a representation of magnitude relative to a reference level on a logarithmic scale. Since it expresses a ratio of two (same unit) quantities, it is a dimensionless unit.

Digital Signal Processing (DSP) uses numerical presentations of the audio signal processing.

Flush-mounting / Half-space
When a straight plane such as a wall or floor limits the spherical radiation of a loudspeaker by splitting the space (sphere) to two halves, the radiation will occur into a half space. A special case of the half space is flush-mounting which has several benefits such as improved low frequency efficiency, elimination of rear wall cancellation and avoidance of cabinet edge diffraction. Once a loudspeaker is flush mounted the acoustical radiation load on the loudspeaker changes and acoustical adjustment of the loudspeaker’s frequency response is required to maintain a flat response at low frequencies.

Free-standing / Free-field
When a loudspeaker can radiate sound without limiting obstacles or surfaces (radiating in the free field) around it it is said to be free standing. The radiation space is a sphere if loudspeaker directivity does not limit the directions the loudspeaker radiates into (at a given frequency).

Magnetic Shielding
Magnetic shielding limits the magnetic fields. Low frequency drivers are magnetically shielded to minimize stray magnetic fields from emanating out from the loudspeaker. The magnetic stray fields can disturb computer screens and other video displays.

Radiation Space
Radiation space refers to the surroundings of a loudspeaker. In simple cases the radiation space can be described by a solid angle (space angle). The radiation angle is an essential factor when investigating the interaction between the loudspeaker and the surrounding air. The radiation space of a loudspeaker can be limited by its radiation characteristics. The radiation characteristics describe the complex, three-dimensional and frequency dependent property of a loudspeaker.

Reflex Port
The reflex port is an acoustically optimized opening in a ‘bass reflex’ loudspeaker enclosure which enhances the reproduction of the lowest frequencies generated by the woofer in a loudspeaker. The bass reflex port generally consists of one or more shaped tubes mounted in the front or rear wall of the loudspeaker enclosure.

Room Response Controls
A collection of controls built in the Genelec loudspeakers used to compensate and eliminate listening room generated acoustical problems in the loudspeaker or subwoofer frequency responses to improve the in-room sound at the listening position.

Sound Pressure Level (SPL)
Sound pressure level is a measurement of the pressure produced by the sound wave, expressed in decibels (dB) relative to 20 microPascals (2 x 10-5 N/m2). 0 dB SPL is the average threshold of human hearing at 1 kHz frequency for young adults.

-3 dB cutoff frequency
The term cutoff frequency (also called the corner frequency or the break frequency) represents the frequency where the energy radiated by the loudspeaker system has been attenuated to one half. At the -3 dB cut-off frequency the sound level has decreased by 3 dB.