Low Mid Contour Frequency: A shelving filter can be set to the flat anechoic response or set to shelve at frequencies of 800Hz, 400Hz, or 200Hz in combination with the low mid contour amplitude (below) to correct half space (pi/2), quarter space (pi/4) and very difficult close field boundary conditions (pi/8 space).

Low Mid Contour: a shelving filter can be set to a flat anechoic response or to -2dB, -4dB, -6dB or -8dB in combination with the low mid contour frequency (above) to correct mid, near and close field listening positions compared with free space, far field conditions.

Figures 3, 4 and 5 below show the range of amplitude settings at 800Hz, 400Hz and 200Hz and the DIP switch settings. DIPs 5 to 8 (inclusive) control the amplitude responses and switches 9 and 10 control the frequency at which the shelving starts. All other DIPs are shown in the 'Flat' position.

Baffle Step Effect: Both low mid frequency and low mid contour are used together to correct for the baffle step effect. the baffle step effect is a well known property of speakers and is caused by a change in air load on the moving diaphragm at a frequency dependant on the effective size of the baffle or cabinet frontal area compared with the wavelength of the sound being reproduced. Most speakers are designed to have a flat amplitude and phase response over the audio band in anechoic or 'free field' conditions where there are no boundary walls close to the bass drive unit. When the speaker is placed against a wall, in a corner, on a mixing console or on a table adjacent to a PC editor the wall boundaries effectively increase the baffle size. This produces a boost in the frequency band around 100 to 800 Hz depending on the effective size and proximity of the boundary surfaces, the size of the bass driver and the distance of the listener from the source.

More at: Olson, H. F. "Direct Radiator Loudspeaker Enclosures" Journal of the Audio Engineering Society Vol. 17, No. 1, 1969 October, pp.22-29

There are many more references to these effects by searching the web for 'Baffle Step Effect'.

Diagramatic View of EQ Dip Switches: Baffle Step Filters, Low Mids, 800Hz

20 way DIP Switch Bank (4+4+2+4+6)

LF EQ

 

Low Mids

 

Hz

 

Up Mid

 

Highs

+10dB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 1 1 0

1 1 1 0

0 0

0 0 0 0

0 0 0 0 0 0

 

 

0dB re 2.8v

 

 

 

 

 

 

 

 

 

 

@ 1 metre

 

 

 

 

 

 

 

 

 

 

-10dB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 1 1 0

0 1 1 0

0 0

0 0 0 0

0 0 0 0 0 0

 

 

 

 

 

 

1 1 1 0

0 0 1 0

0 0

0 0 0 0

0 0 0 0 0 0

 

 

 

 

 

 

1 1 1 0

0 0 0 0

0 0

0 0 0 0

0 0 0 0 0 0

 

 

 

 

 

 

1 1 1 0

0 0 0 1

0 0

0 0 0 0

0 0 0 0 0 0

 

 

10Hz

20Hz

50Hz

100Hz

200Hz

500Hz

1Khz

2kHz

5kHz

10kHz

20kHz

Fig. 3. DIP switches 5 to 8 control amplitude, 9 & 10 control frequency - set here to 800Hz. All other DIPs set to 'flat'.

Diagramatic View of EQ Dip Switches: Baffle Step Filters, Low Mids, 400Hz

20 way DIP Switch Bank (4+4+2+4+6)

LF EQ

 

Low Mids

 

Hz

 

Up Mid

 

Highs

+10dB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 1 1 0

1 1 1 0

0 0

0 0 0 0

0 0 0 0 0 0

 

 

0dB re 2.8v

 

 

 

 

 

 

 

 

 

 

@ 1 metre

 

 

 

 

 

 

 

 

 

 

-10dB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 1 1 0

0 1 1 0

1 0

0 0 0 0

0 0 0 0 0 0

 

 

 

 

 

 

1 1 1 0

0 0 1 0

1 0

0 0 0 0

0 0 0 0 0 0

 

 

 

 

 

 

1 1 1 0

0 0 0 0

1 0

0 0 0 0

0 0 0 0 0 0

 

 

 

 

 

 

1 1 1 0

0 0 0 1

1 0

0 0 0 0

0 0 0 0 0 0

 

 

10Hz

20Hz

50Hz

100Hz

200Hz

500Hz

1Khz

2kHz

5kHz

10kHz

20kHz

Fig. 4. DIP switches 5 to 8 control amplitude, 9 & 10 control frequency - set here to 400Hz. All other DIPs set to 'flat'.

Diagramatic View of EQ Dip Switches: Baffle Step Filters, Low Mids, 200Hz

20 way DIP Switch Bank (4+4+2+4+6)

LF EQ

 

Low Mids

 

Hz

 

Up Mid

 

Highs

+10dB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 1 1 0

1 1 1 0

0 0

0 0 0 0

0 0 0 0 0 0

 

 

0dB re 2.8v

 

 

 

 

 

 

 

 

 

 

@ 1 metre

 

 

 

 

 

 

 

 

 

 

-10dB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 1 1 0

0 1 1 0

1 1

0 0 0 0

0 0 0 0 0 0

 

 

 

 

 

 

1 1 1 0

0 0 1 0

1 1

0 0 0 0

0 0 0 0 0 0

 

 

 

 

 

 

1 1 1 0

0 0 0 0

1 1

0 0 0 0

0 0 0 0 0 0

 

 

 

 

 

 

1 1 1 0

0 0 0 1

1 1

0 0 0 0

0 0 0 0 0 0

 

 

10Hz

20Hz

50Hz

100Hz

200Hz

500Hz

1Khz

2kHz

5kHz

10kHz

20kHz

Fig. 5. DIP switches 5 to 8 control amplitude, 9 & 10 control frequency - set here to 200Hz. All other DIPs set to 'flat'.

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Tannoy 8D, 66D owner manual Way DIP Switch Bank 4+4+2+4+6

8D, 6D, 66D specifications

Tannoy is a prominent name in the audio industry, known for its high-quality loudspeakers that deliver pristine sound. Among its acclaimed offerings are the Tannoy 8D, 6D, and 66D models. Each of these speakers boasts unique features, advanced technologies, and specifications that cater to audiophiles and casual listeners alike.

The Tannoy 8D is a versatile loudspeaker, ideal for both home and professional environments. It employs Tannoy's proprietary Dual Concentric driver technology. This innovative design integrates both high and low-frequency drivers into a single unit, ensuring that sound waves emanate from a single point source. This attribute significantly enhances coherence, imaging, and soundstage. The 8D features a robust 8-inch driver, allowing for a wide frequency response suitable for various music genres. With an elegant wooden cabinet, the 8D also serves as an attractive addition to any décor while minimizing unwanted resonances.

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The Tannoy 66D rounds out this trio with an emphasis on superior sound reproduction. This model features a larger 15-inch Dual Concentric driver, designed for those who seek a more powerful audio experience. The 66D excels in delivering deep, rich bass alongside detailed mids and highs, making it an excellent choice for larger rooms or professional studio settings. With enhanced power handling capabilities, the 66D is well-equipped to manage dynamic audio signals, ensuring that musical nuances are faithfully reproduced.

Across these models, Tannoy exhibits its commitment to quality in materials, engineering, and design. Each speaker is crafted with precision and attention to detail, utilizing high-grade components that enhance durability and performance. The combination of innovative technologies, such as the Dual Concentric driver, and thoughtful design elements make Tannoy’s 8D, 6D, and 66D exceptional choices for those who appreciate superior sound and craftsmanship. Whether you are looking for compact speakers for your home or professional-grade options, Tannoy offers a solution that fits a variety of needs and preferences.