----- Experience in your own room the magical nature of stereo sound -----

 

 

What's new

 

LX - Store

 

BLACKLIST

 

Conversations
with Fitz

 

OPLUG
Forum

 

Basics

The Magic in 2-Channel Sound

Issues in speaker
design

Dipole models

Active filters

Amplifiers etc

Microphone

FAQ's

Loudspeakers

Crossovers

Room acoustics

Stereo Recording and Rendering

Audio production

Conclusions

 

Projects

Your own desig

LXmini

LXmini+2

LXstudio

LX521.4

LX521
reference

ORION
challenge

ORION-3.4

PLUTO-2.1

WATSON-SEL

PLUTO+
subwoofer

THOR
subwoofer

PHOENIX
dipole speaker

Three-Box active
system (1978)

Reference
earphones

Surround
sound

Loudspeaker
& Room

 

Resources

Publications

Sound recordings

Links

Other designs

My current setup

About me

Site map

 

HOME

 

------------------
Digital Photo
Processes

 

------------------
The
Sea Ranch

 

------------------
My Daughter
the Jeweler

 

What's new

 

LX - Store

 

Conversations
with Fitz

 

OPLUG
Forum

 

 

 


| Introduction | Estimates | Design | Measurement | Equalization | THOR-ORION xo |
| Supplies | SPL limits |

 

Build your own subwoofer

Often it is desirable to add very low frequency bass to the sound output of an existing loudspeaker system. Home Theater setups provide a low frequency effects (LFE) signal for such sounds as dinosaur footsteps and explosions. Here, quantity of bass is often more important than quality, in order to shake the house and instill primordial fear. For music reproduction high accuracy and resolution of bass is most desirable. Unfortunately, this is often degraded by low frequency room resonances. To reduce their effect I have chosen open baffle woofers for the PHOENIX system.  

Room modes cannot exist when 1/2 of a sound wavelength exceeds the longest room dimension. If this is 7.5 m (24.6 ft), then a wavelength will be 15 m and the lowest mode frequency is 343 m/s / 15 m = 23 Hz. Below this frequency bass response may increase due to room gain, if the woofer is a monopole. For a dipole woofer the response may stay flat or drop off, depending on the rigidity of room surfaces and lack of any openings. Thus, there will be situations where the addition of a monopole woofer below 40 Hz or so, in a range where there are few room resonances, can add to the realism of sound reproduction. 

The THOR monopole, sealed box woofer is meant to augment a dipole woofer or any other loudspeaker where accurate, non-booming sub-bass is desired. This woofer requires its own power amplifier and relies on electronic equalization for its low frequency response. It is simple to construct. The description of the design process can serve as an example of how to account for different drivers and cabinet sizes, when you consider your own woofer design. 

This is meant to be a DIY project for the music loving hobbyist. Should you consider using part or the whole of my design for commercial purposes, then contact me for permission and contractual agreement before using any of the information provided.

 


| Introduction | Estimates | Design | Measurement | Equalization | THOR-ORION xo |
| Supplies | SPL limits |

 

 

What you hear is not the air pressure variation in itself 
but what has drawn your attention
in the streams of superimposed air pressure variations 
at your eardrums

An acoustic event has dimensions of Time, Tone, Loudness and Space
Have they been recorded and rendered sensibly?

___________________________________________________________
Last revised: 02/15/2023   -  © 1999-2019 LINKWITZ LAB, All Rights Reserved