Setting the Phase Control

The effect of incorrect phase alignment between main monitors and subwoofer is a drop in the frequency response of the whole system at the crossover frequency. The graphs below (figure

3)show the effect of phase difference on the frequency response.

The phase difference between the main monitors and subwoofer at the listening position is dependent upon the position of the subwoofer in the listening room. For accurate system alignment in the room acoustic

Coarse Phase Correction Method

The method to coarse align the phase of the system is as follows.

•Connect an audio frequency signal generator to one of the channels used in the system. If the signal generator has an unbalanced output use a cable with pin 3 grounded to pin 1 at the input as shown in figure 4 below.

CABLE

2

1

Connect a high grade measuring microphone to the analyser and feed pink noise into the left main monitor. Position the microphone at the listening position and adjust the input sensitivity of the subwoofer until frequencies below and above 85 Hz are reproduced with equal level. Then adjust the phase control switches until a clear dip of at least -6dB can be seen at the crossover frequency (85 Hz).

If a dip appears at several switch positions select the one that gives the

measuring equipment is required. If this equipment is not available to the

RCA

SCREEN

3

XLR

deepest reading. This should be the case where the phase difference

user coarse phase matching can be applied.

P h a se D iffere n ce : 0°

8 5 H z

MALE

Figure 4. XLR to RCA connector for unbalanced operation.

•Set the frequency generator to 85Hz. If a signal generator is not available then it is possible to use an audio test recording with a test frequency in the range 70Hz to 100Hz.

between the subwoofer and the main monitors is at a maximum. To change the phase difference to a minimum the -180° switch should be moved to the opposite setting. The frequency analyser should now show the smoothest response around 85 Hz and the phase should now be set correctly. Repeat the above procedure with the right channel and possible centre channel main monitors.

P h a se D iffere n ce : 90 °

8 5

H z

 

P h a se D iffere n ce : 18 0 °

8 5

H z

•Toggle the -180° phase

 

 

 

 

 

 

 

 

switch 'on' and 'off' and set

 

 

 

 

 

 

 

 

it

 

4

 

 

 

 

 

 

 

 

 

to the position which gives

 

 

 

 

 

 

3

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

the lowest sound level at the

ON

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

listening position.

 

 

 

 

 

 

 

 

• Next toggle the -90° phase

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

 

 

switch 'on' and 'off', and again

 

3

set it to the position which

 

 

 

 

ON

 

 

 

 

 

 

1 2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

gives the lowest sound level.

 

 

 

 

 

 

 

 

• Finally, set the -180° phase

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3 4

 

 

 

 

 

 

 

switch to the opposite setting.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

ON

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Subwoofer Bypass Control

A bypass control feature is included into the subwoofer circuits so that the effect of the subwoofer on the whole monitor system can be determined. With the bypass switch on, the high pass filters for the main monitors are bypassed and the system behaves as if the subwoofer were not connected. The bypass remote controller is inserted into the ¼ inch jack socket located on the rear amplifier panel. See figure 5 for construction details.

P h a se D iffere n ce : 27 0 °

8 5 H z

Figure 3. The effect of phase difference between the subwoofer and the main monitors

Phase Correction Method with Test Equipment

If a frequency analyser and a pink noise generator are available then the following procedure can be used to match the phasing between the subwoofer and the main monitors.

Mono ¼ inch

Jack Socket

SPST Switch

Figure 5. Bypass Remote Switch Construction.

Page 3 Page 5
Page 4
Image 4
Genelec 1094A, 1092A manual Setting the Phase Control, Coarse Phase Correction Method, Subwoofer Bypass Control
Page 3 Page 5

1092A, 1094A specifications

The Genelec 1092A and 1094A are prominent models in Genelec's line of high-performance studio monitors. Designed for professional audio applications, these monitors offer exceptional sound quality and a range of advanced features that make them ideal for studio environments.

The Genelec 1092A is a compact monitor, featuring a 4-inch woofer and a 0.75-inch tweeter, which together provide a frequency response of 67 Hz to 25 kHz. This model is particularly well-suited for small studio spaces where high-quality sound reproduction is critical, yet physical space is limited. The 1092A employs Genelec's directivity control waveguide technology, which helps achieve a smooth and consistent frequency response across various listening positions.

In comparison, the Genelec 1094A is a larger monitor with an 8-inch woofer and a 1-inch tweeter, resulting in a broader frequency response down to 45 Hz. This extended low-frequency capability allows the 1094A to deliver rich bass and provides a more impactful listening experience in larger rooms or for genres that demand a deep low end.

Both models feature Genelec's innovative Minimum Diffraction Enclosure (MDE), which minimizes diffraction effects and provides an accurate representation of the audio signal. This unique design is part of what sets Genelec monitors apart, enhancing their clarity and precision, even at high volumes.

The 1092A and 1094A also utilize a built-in amplification system that consists of high-performance class D amplifiers. These amplifiers are specifically designed to match the drivers’ characteristics, ensuring optimal performance while maintaining efficiency. Moreover, both models include advanced signal processing capabilities, including room response controls that allow users to tailor the monitors’ sound to suit their specific room acoustics.

Additionally, Genelec has integrated eco-friendly technologies in these monitors, featuring energy-saving power management systems that automatically switch to standby mode after a period of inactivity. This approach not only reduces energy consumption but also reflects the brand's commitment to sustainability.

In summary, the Genelec 1092A and 1094A studio monitors are engineered to deliver outstanding audio performance, showcasing a combination of innovative technologies, commitment to quality, and user-friendly features. Whether in a small home studio or a large professional environment, these monitors provide precise sound reproduction that meets the demanding standards of today's audio professionals.
Top Page Image Contents