GB2568223A

GB2568223A - Bass generator 20Hz> audio system reinforcement

Info

Publication number: GB2568223A
Application number: GB1714879.2A
Authority: GB
Inventors: Gowler Hart David
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-09-15
Filing date: 2017-09-15
Publication date: 2019-05-15
Also published as: GB201714879D0

Abstract

A speaker cabinet 13 having an improved bass low frequency response has a power supply 1, an amplifier 2 and a voltage converter 3. Amplified signals may pass through an active bass filter 4 and a passive bass filter 5, to adjust the crossover point, before a line level convertor 6. The resultant signals are directed to an array of multiple rear facing small bass drivers or transducers 8 located in the rear of the cabinet. A forward facing passive full range transducer 11, a crossover unit and bass controls 9, 10 may all be positioned in the front face or grill of the cabinet.

Description

20Hz> bass Generator and full range speaker I transducer

1.

The present invention relates to a frequency adjustable 20Hz > bass speaker/ transducer and is for use with any full range transducer system or the passive full range transducer on the front of the speaker cabinet for use with audio equipment to reproduce the full 20Hz-20kHz bandwidth available in amplified audio reproduction.

It is recognised by many experts in the field of hi- equipment that for optimum performance of audio reproduction the full bandwidth of 20Hz-20kHz +/-3db is needed to retrieve all the information in the audio recording.

At present the size of transducer cabinets needed is very large to achieve down to 20Hz @ +/-3db and above bandwidth.

The present invention achieves 20Hz> in a very small cabinet by comparison to the current large cabinets needed. This is due to the use of a passive low pass filter and then a further active low pass filter before the amplification stage and also by using many (in the example given) small rear facing speaker transducers. The collective driver face is capable of maintaining this frequency due to their ability to remain stable at low frequencies because of their size and sensitivity as well as improved magnet technology and by working as a collective driver face. In this case small drivers have been used also to keep the size and weight of the speaker to a minimum for domestic and studio purposes where space limitations are a concern. This arrangement can be used with larger transducers for large scale public address. The resulting 20Hz> bass response will be achieved by a speaker and cabinet that is much lighter and smaller but with the same quality and scale as any current public address rivals.

The aim with the present invention here was to achieve bass frequency at the same volume as the rest of the audio range and tests show that it is capable of below 20Hz and the active low pass filter can be adjusted to suit the crossover point of (in this case) the front facing full range transducer i.e. 70Hz (in this case) which is the bass roll off point of the full range driver thereby reinforcing the full range transducer to achieve down to 20Hz continuously despite the small size of the full range driver making this a most efficient full 20Hz-20kHz tranducer/speaker and at +/- Odb in other words at the same volume as the rest of the bandwidth. Therefore 20Hz - 20kHz is achieved within the industry standard of the minimum of volume deviations throughout the overall frequency range/response/bandwidth i.e. +/-3db.

Embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings, of which:

Figure 1 Shows the 20Hz> Bass Generator and full range transducer I Speaker

1. Is the Amplifier Power Supply 2. The power amplifier 3. Voltage converter to power the active low pass filter. 4. Shows the active low pass filter 5. Shows the passive low pass filter the 6. High level to low level converter to convert the users audio amplifier signal from the speaker terminals and convert it to a low or line level voltage prior to filtering 7. Speaker terminals for Audio input from the source amplifier i.e. HiFi etc. 8. Shows small rear facing bass transducers/ drivers. 9. Frequency adjustment control on the active low pass filter. 10. Volume control on the active low pass filter. 11. Full range front facing transducer I driver. 12. Full range crossover, if needed. 13. Speaker cabinet.

Claims

1. A 20Hz> Bass generator will reinforce the bass frequency from the full range driver(s) roll off point or crossover point (for example) 70Hz so the passive bass filter can be built to low pass at 70Hz and also the frequency control can be adjusted to 70Hz and the filter will now be set to low pass at 70hz down to 20Hz. The low pass filtration system will now only allow the bass generator to produce between 20Hz and 70Hz. Thereby reinforcing the full range driver’s roll off point of 70Hz and achieving a response of 20Hz-70Hz @+/Odb from the bass generator and at least an overall frequency response of 20hz-20kHz at +/-3db which is the minimum standard of volume deviation required from an accurate speaker system.

2. The multiple transducers/drivers with the help of some cabinet pressure and strength will act as one overall driver face or collective driver face with each driver remaining stable and supported by it’s counterparts despite low frequency output being high. The overall power handling capabilities and the constraints afforded to each driver by the use of modern materials in it’s construction and improved lightweight modern high magnet strength make the multiple drivers capable of high output when many are used together and when loaded into a cabinet that although small is capable of restraining the drivers also so that they remain stable at a high output of low frequencies in this case 20Hz.

3. The collective speaker will thereby be small but capable of low frequency (20Hz) handling capabilities.

4. Heavy large drivers will require more power to achieve the oscillations required for such low frequencies. Thereby needing to be larger and heavier and reinforced by larger cabinets. The present invention is lightweight and more efficient thereby saving both weight and size.

5. The bass generator frequency output can be adjusted to suit any modern drivers roll off point and reinforce those drivers to 20Hz.

6. The bass generator will reinforce any speaker to 20Hz @ Odb

7. The bass generator when used with a quality full range transducer system will achieve 20hz-20kHz within the required standard of +/-3 db

8. The bass generator can be adjusted to suit any and all full range transducer systems.

9. The bass generator can be created from any number of drivers and within an effective size of driver but with minimal size and weight of cabinet.

10. The bass generator reduces the size and weight of speaker cabinets needed to reproduce 20hz-20kHz by a considerable amount thereby saving money space and effort.

11. The bass generator is lightweight and comparatively reduces markedly the need for large heavy bass transducers currently available thereby decreasing costs for the same scale of low frequency output.

12. The bass generator reproduces the full audio bandwidth of 20Hz-20kHz when used with a full range transducer system.

13. The bass generator can use any number of bass drivers/transducers to achieve 20Hz in any situation.

14. The bass generator has a very high volume output/scale compared to any speaker system of it’s size.

15. The bass generator uses a small cabinet.

16. The bass generator increases the size of the sound by many times when compared directly in size with any current speaker system within the required reproduction standard of 20Hz-20kHz +/-3db

17. A bass generator to produce 20Hz>

18. A bass generator that can be used in a domestic, studio or public address setting.