Full range speaker cabinet design


  • About the company
  • Speaker Cabinet Design – Styles and Techniques
  • Loudspeaker Cabinet Plan
  • Enclosure catalogue
  • Celestion Loudspeakers
  • Why a DIY Speaker Cabinet is better Than a Retail Speaker cabinet
  • About the company

    He should, he designed them himself. My friend is an engineer by trade, and a person with an uncanny ability to focus and delve deeply into the principles behind the area of loudspeaker design. There were a ton of speaker cabinet design directions he could have gone with, but he settled on some very simple plans that allowed him to do some comprehensive math and acoustic calculations using software made for that very purpose.

    The frequency range—particularly the low frequency extension, will guide some basic dimensions related to the speaker cabinet design. H-PAS and other fancy porting solutions aside, the capabilities of the low frequency driver will ultimately interact with the speaker cabinet and affect your low frequency response and tuning.

    Do you want a floorstanding tower speaker, or a pair of bookshelves? Are you designing a full-range speaker or a subwoofer? I have yet to see any of my friends tackle a bipole or dipole speaker—and for good reason. Those are highly advanced designs that incur their own set of difficulties and design challenges.

    Example: I want to go with a tower design that is ported. Will the box be ported also called a bass-reflex design? Where will that port exist front or back? Will you opt for an acoustic suspension design also called a sealed design? Each of these considerations needs to take place before proceeding too far down the path of loudspeaker design. For now, just know that you have some preliminary decisions to make before going too far.

    Example: I want a trapezoidal top on a ported cuboid base. Crossover Design — Passive, Active, or a Kit A crossover is a typical component in any loudspeaker design, though I have heard of designers custom-making speakers without the use of a crossover. In most cases, however, a crossover is needed to filter what frequencies go to the tweeter or high frequency driver and which go to the low frequency driver.

    Some, however, may opt to roll their own passive crossover network—perhaps based on a computer recommendation or an existing kit design. It all depends on how far you want to take or customize your loudspeaker design. While you can certainly design a box, do your own math, and add your own drivers, investing in a good piece of speaker design software will do wonders.

    The software provides an easy to use interface to calculate volumes of the front and rear chambers of the box, calculate box dimensions, determine the resonance frequency, -3 dB points for both the high and low pass filters, port length and diameter, frequency response plot, and power response.

    Unibox — Unibox is more of a sophisticated spreadsheet than a piece of software. It operates under the principle that simplifcation is no longer needed and the full driver-box model can be implemented. The full driver-box model includes individual control of absorption, leakage and port losses.

    The software also includes graphs for sound pressure levels produced by port leaks, speaker impedance and step response. Unibox works for Boxnotes — Boxnotes is software designed to help you design a subwoofer with appropriate dimensions for the goals you have. It accounts for extra volume taken up by your ports, bracing and driver; checks the minimum dimensions required to house your driver; lets you see the effect of changing port parameters; and helps you spot problem resonances and adjust your dimensions.

    It even prints your cutting list. Winspeakerz — Winspeakerz lets you select a woofer for your home theater speaker from the driver database and load it into the software. You then select the type of enclosure you want to simulate closed, vented or bandpass with a total of 18 different variations.

    You can then enter different volumes and tunings and run the analysis to analyze the effects. After deciding on the box you can then open the box calculator and have WinSpeakerz suggest your loudspeaker dimensions. There are a ton more applications, some commercial SoundEasy , Eminence Designer , etc and some freeware or trialware like this woofer box and circuit designer.

    Speaker Cabinet Design – Styles and Techniques

    The benefits of this type of system are great and as follows: 1. Phase coherence easily achieved 3. If you move your system from one room or home to another you can make adjustments for the new environment that your system resides in. Try that with analog crossovers! The end result is more musical, more dynamic, and more alive sounding than a system using passive crossover networks. Active crossovers are known to be superior but they have not caught on in the retail market. Consumers are often wary of trying something they have not heard about.

    There may be other valid reasons too but these are what I could come up with. Foobar crossover for music Thuneau Allocator Lite for movie playback Chosen because of how they sound on each medium. It takes a 2 channel signal and converts to 2 way, 3 way, or 4 way output per speaker.

    Also know as Linkwitz Riley 4 or LR4 for short. This is a fairly steep slope and provides good integration between drivers. There is no localization of the drive units from my listening position 10 ft from speakers. The Echo Audiofire 8 is a firewire unit. You can use a surround processor or receiver if it has multichannel analog inputs.

    This makes an entirely active speaker system using digital software crossovers. It works remarkably well and is very versatile. Changes can be made in seconds. Measurements of room response, impulse or whatever can be measured very easily with the use of the PC.

    Having heard what this type of system can do will spoil you. You will never go back to analog or passive crossovers. And, it makes building your DIY speaker cabinet project a bit easier and trouble free. You could also use a speaker controller such as the Behringer Digital crossover unit instead of the Home Theater PC and software crossover that I used.

    Use a DEQX active crossover control unit 3. An active crossover from Marchand can be a good solution 4. He likes passive crossover networks so I would learn from someone who likes them if you plan to build a passive crossover.

    The speaker drivers used are the Vifa XT25 tweeter with dual magnets. The midrange driver is the famous Usher A midrange driver for the midrange. The SB acoustics 12 in driver for the bass. You could use one or two of these per cabinet. The cabinet design allows for two bass drivers if you wish. Each driver chamber in the Speaker Box is a sealed or acoustic suspension box design.

    Loudspeaker Cabinet Plan

    Do you want a floorstanding tower speaker, or a pair of bookshelves? Are you designing a full-range speaker or a subwoofer? I have yet to see any of my friends tackle a bipole or dipole speaker—and for good reason.

    Those are highly advanced designs that incur their own set of difficulties and design challenges. Example: I want to go with a tower design that is ported. Will the box be ported also called a bass-reflex design? Where will that port exist front or back? Will you opt for an acoustic suspension design also called a sealed design? Each of these considerations needs to take place before proceeding too far down the path of loudspeaker design. For now, just know that you have some preliminary decisions to make before going too far.

    Example: I want a trapezoidal top on a ported cuboid base.

    Enclosure catalogue

    The bass extension generated from these drivers in a bigger cabinet like pensil or FHXL is unbelievable. But to experience that bass you need to place it properly around 20cm from backwall 30cm from corners facing length wise in a rectangular room.

    Accuracy of fast articulated bass like my bass-brian bromberg is exceptional. Apart from accuracy the bass is deep and very clean in nature like something from a servo-subwoofer Mids are smooth and neutral Treble when kept without toe-in sounds a bit less.

    So I resorted for around 10to 15 degrees toe-in which gave a smooth warm treble around 3 to 5db below midrange Sound stage is one of the best ive heard from any speaker.

    Celestion Loudspeakers

    Below you will find articles on some of the work done over the last two decades. Building speakers has be on and off for more than forty years since high school, and with the availability of PC-based measuring equipment in the Nineties my hobby took another direction, as it became very much clear, that doing crossovers by calculation and fine-tuning by ear had its shortcomings.

    Over the years my focus has moved from small and inefficient speakers to larger constructions providing less distortion and increased dynamics, things that make reproduced music live and engaging.

    Below you will find speakers ranging from 2 to litres volume and I hope you will find inspiration for your next DIY project or buy one of the kits from Jantzen Audio. In case you want advice on which speaker to build, please read both " choices " and " crossovers " before writing. I shall not recommend any speaker for reasons outlined in the " choices " file, and please do not ask about the sonic differences between two speakers.

    Why a DIY Speaker Cabinet is better Than a Retail Speaker cabinet

    What I hear is unlikely to be what you will hear. Sorry, but time doesn't allow assisting in any hypothetical combination of drivers of your own choice, nor renovation of vintage speakers not listed below. Should you run into problems with the constructions presented here, I'll do all I can to assist in the successful implementation.

    Designing loudspeakers is not necessarily rocket science. Designing loudspeaker drivers is another thing, but picking drivers and making a suitable cabinet and crossover is basically a matter of handling fairly simple measuring equipment, simulation software - and experience.


    thoughts on “Full range speaker cabinet design

    1. I apologise, but, in my opinion, you are not right. I suggest it to discuss. Write to me in PM, we will talk.

    2. I consider, that you are not right. I am assured. Let's discuss it. Write to me in PM, we will communicate.

    Leave a Reply

    Your email address will not be published. Required fields are marked *