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WinSpeakerz User’s Guide
Demo version 2.3.1
Revised 14Jun99
[pic]
1.0 WinSpeakerz, The Speaker Design Toolbox for Windows
WinSpeakerz is a loudspeaker simulator that runs under Windows 95, 98 and NT. WinSpeakerz provides you with a toolbox containing everything you need to design state of the art loudspeakers. You can perform unlimited “what if ” simulations byvarying the box sizes and tuning frequencies. The result? By predicting the performance your loudspeakers before you build them WinSpeakerz helps you design highly optimized speaker enclosures, even on the first try!
1.1 Loudspeakers and The Signal Chain
We encounter audio systems every day. At the drive-up window, watching TV, on the phone. Even your computer has an audio system. Not tomention your stereo. There is a loudspeaker at the end of the line at each of these audio systems.
The loudspeaker is the limiting factor in the sound quality of all these systems, with rare exception. This places the loudspeaker in the role as final arbiter of sound quality for just about every audio system we encounter.
In the largest sense, an 'audio system' would include everything in thepath between the original audio event and the ear of the listener. This starts with the acoustic environment of the event, the microphone, mixer, recorder, etc. ...all the way up to your favorite CD. At the back end of the signal chain your CD player recovers the signal and converts it from the digital domain to the analog domain where it is transferred, with great accuracy, to your power ampand ultimately presented to your speakers for the launch of an acoustic waveform into the room and toward your ears.
Audio designers refer to this grand path as the 'signal chain'. Like a real chain, the signal chain is only as strong as its weakest link. The weak links in the signal chain are at each end: the microphones and the speakers. When we consider the equipment path that connects ourears with the musicians we hear on our favorite CD's, we see a complex chain of gear which ends with the speakers in our listening room. Our loudspeakers are the critical link in the complete signal chain.
1.2 The Audible Frequency Range
Audio is defined by the range of acoustic vibrations (measured in Hertz) which are audible to us humans as sound. The range of human hearing is normallyconsidered to be from about 20 Hz to 20k Hz. The frequencies of pianos, keyboards, guitars, other musical instruments, and the human voice fall within this audible range.
[pic]
Figure 1: Frequency Range of Human Hearing
Our goal in designing loudspeakers is to create systems that accurately reproduce the full range of frequencies that are audible to the human ear. Ideally, we wouldlike to have a loudspeaker play at the same loudness regardless of the pitch (frequency) of the sound.
Unfortunately, real loudspeakers can only stay flat for so long as pitch is reduced. Loudspeakers are limited in how low they can go and the frequency response curve shows you visually how low the speaker does go. We'd like for the curve to remain flat for as long as possible as it goes fromright to left, but at some point it will roll off and pass through the F3 point and we will start losing bass. That is, the frequency where the response is down 3dB. We want to design an enclosure with the F3 as part of the design criteria. Now let's explore some frequency response curves for the driver in the WinSpeakerz demo.
[pic]
Figure 2: A Typical Frequency Response Curve
2.0Using WinSpeakerz
Let's begin by launching the WinSpeakerz Demo. Once you have launched WinSpeakerz you will see the three windows displayed on the screen as shown below. This trio of windows acts as a workbench where you can try out an unlimited number of new designs.
[pic]
Figure 3: The WinSpeakerz Workbench
The Plot window is the large upper window where the...
Demo version 2.3.1
Revised 14Jun99
[pic]
1.0 WinSpeakerz, The Speaker Design Toolbox for Windows
WinSpeakerz is a loudspeaker simulator that runs under Windows 95, 98 and NT. WinSpeakerz provides you with a toolbox containing everything you need to design state of the art loudspeakers. You can perform unlimited “what if ” simulations byvarying the box sizes and tuning frequencies. The result? By predicting the performance your loudspeakers before you build them WinSpeakerz helps you design highly optimized speaker enclosures, even on the first try!
1.1 Loudspeakers and The Signal Chain
We encounter audio systems every day. At the drive-up window, watching TV, on the phone. Even your computer has an audio system. Not tomention your stereo. There is a loudspeaker at the end of the line at each of these audio systems.
The loudspeaker is the limiting factor in the sound quality of all these systems, with rare exception. This places the loudspeaker in the role as final arbiter of sound quality for just about every audio system we encounter.
In the largest sense, an 'audio system' would include everything in thepath between the original audio event and the ear of the listener. This starts with the acoustic environment of the event, the microphone, mixer, recorder, etc. ...all the way up to your favorite CD. At the back end of the signal chain your CD player recovers the signal and converts it from the digital domain to the analog domain where it is transferred, with great accuracy, to your power ampand ultimately presented to your speakers for the launch of an acoustic waveform into the room and toward your ears.
Audio designers refer to this grand path as the 'signal chain'. Like a real chain, the signal chain is only as strong as its weakest link. The weak links in the signal chain are at each end: the microphones and the speakers. When we consider the equipment path that connects ourears with the musicians we hear on our favorite CD's, we see a complex chain of gear which ends with the speakers in our listening room. Our loudspeakers are the critical link in the complete signal chain.
1.2 The Audible Frequency Range
Audio is defined by the range of acoustic vibrations (measured in Hertz) which are audible to us humans as sound. The range of human hearing is normallyconsidered to be from about 20 Hz to 20k Hz. The frequencies of pianos, keyboards, guitars, other musical instruments, and the human voice fall within this audible range.
[pic]
Figure 1: Frequency Range of Human Hearing
Our goal in designing loudspeakers is to create systems that accurately reproduce the full range of frequencies that are audible to the human ear. Ideally, we wouldlike to have a loudspeaker play at the same loudness regardless of the pitch (frequency) of the sound.
Unfortunately, real loudspeakers can only stay flat for so long as pitch is reduced. Loudspeakers are limited in how low they can go and the frequency response curve shows you visually how low the speaker does go. We'd like for the curve to remain flat for as long as possible as it goes fromright to left, but at some point it will roll off and pass through the F3 point and we will start losing bass. That is, the frequency where the response is down 3dB. We want to design an enclosure with the F3 as part of the design criteria. Now let's explore some frequency response curves for the driver in the WinSpeakerz demo.
[pic]
Figure 2: A Typical Frequency Response Curve
2.0Using WinSpeakerz
Let's begin by launching the WinSpeakerz Demo. Once you have launched WinSpeakerz you will see the three windows displayed on the screen as shown below. This trio of windows acts as a workbench where you can try out an unlimited number of new designs.
[pic]
Figure 3: The WinSpeakerz Workbench
The Plot window is the large upper window where the...
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