Audio Speaker Enclosure
2010
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speaker building... site?? or help?
Hi,
Ok I know alot about audio but now want to dive into Speaker Building.. I have chosen a place at www.partsexpress.com but When I look into building a speaker I dont know exactly what ratio to make.. for example.. the woofer being say 150w rms, while the tweater should be the same area? or 50w rms because it is such a high tone...
Also not sure what a 47uF 100v capacitor does exactly, or the 0.10mH 20AWG (wire guage I know) Air Core Inductor does....
I browsed through the Project Showcase and seen what people have made/submitted.
Also how to "tune" A box and correctly make the Hertz so the speaker will preform well..
I know it is alot of questions but maybe if someone who knows alot about the subject can send me a message I will give them my MSN address and maybe I could get some help. It wont take long I have a good idea of what speakers I would like to use in an enclosure.
Thanks
If you’re in the minority of people who consider themselves a serious audio enthusiast then your ultimate goal should be musical accuracy, i.e., attempting to recreate what the recording engineer was hearing when he/she recorded the music. This is not an easy feat by any means, especially for certain types of music, and the difficulty is further exacerbated by the acoustics of the listening room. It will also be dependent on your hearing as well as your listening skills. To do a proper job of building your own loudspeakers you will need to take all of these basic factors into consideration along with your budget.
First and foremost you want to choose audio transducers (aka drive units or drivers,) that meet your audio reproduction requirements. For most consumer audio applications you do not need to worry too much about the power handling capacity of the individual drivers during the driver selection process as long as you’re planning to use high quality, high performance drive units.
Passive filter networks—including crossovers—for multiway loudspeakers are comprised of three basic passive electronic components: capacitors, inductors and resistors.
Electroacoustic transducers used in loudspeakers operate according to alternating current (AC) circuit principles. Consider a theoretically ideal loudspeaker consisting of one or more purely resistive audio transducers..., adding a capacitor to the signal path between an audio amplifier and any transducer will result in the gradual attenuation of lower frequencies due to capacitive reactance. Similarly, adding an inductor to the signal path between an audio amplifier and any transducer will result in the gradual attenuation of higher frequencies due to inductive reactance. Capacitive and inductive reactance results from the phase difference between voltage and current when an AC signal is applied to circuits containing capacitors and inductors, respectively.
Inductive reactance [1] increases as the frequency of the signal INCREASES and capacitive reactance [2] increases as the frequency of the signal DECREASES - both of which reduce the current being delivered to the load. Hence inductors are used to attenuate higher frequencies, aka low-pass filtering, and capacitors are used to attenuate lower frequencies, aka high-pass filtering. The greater the inductance the higher the inductive reactance while the greater the capacitance the lower the capacitive reactance. In other words, inductive reactance varies in direct proportion to inductance and signal frequency while capacitive reactance varies inversely to capacitance and signal frequency. Of course all of this is assuming a perfectly resistive load, which the overwhelming majority of audio transducers are not. Furthermore, almost all common audio transducers have their own intrinsic capacitive, inductive and resistive elements, which together form the (complex) impedance of a transducer. It is the highly reactive and varying nature of this complex impedance that significantly complicates the design of passive filter networks for high performance loudspeakers.
XL = 2 π f L [1]
1
XC = ——— [2]
2 π f C
XL and XC are in units of Ohms; L is in units of Henries; C is in units of Farads; and f is in units of Hertz. (Note: the L in “XL” and the C in “XC” should both be written as subscripts.)
Connecting your 47 µF capacitor and 0.10 mH inductor to a single, purely resistive, constant resistance, full-range audio transducer would result in the following:
For a 4Ω Audio Transducer:
The capacitor would provide an additional 6dB of attenuation per octave below 846 Hz and the inductor would provide an additional 6dB of attenuation per octave above 6366 Hz, approximately.
For an 8Ω Audio Transducer:
The capacitor would provide an additional 6dB of attenuation per octave below 423 Hz and the inductor would provide an additional 6dB of attenuation per octave above 12732 Hz, approximately.
I encourage you to take advantage of my “Loudspeaker Design and Construction Resources,” to which I’ve provided a link below. (Please note that it is an ongoing work that is periodically revised and updated as needed.) Also check your local libraries and/or bookstores for DIY loudspeaker publications such as Vance Dickason’s excellent “Loudspeaker Design Cookbook” and others, which will be immensely helpful when it comes to successfully building your own loudspeakers.
On a final note…, when it comes to the all important crossover network, (if you’re currently unwilling or unable to commit the finances to acquire your own loudspeaker design software,) I highly recommend that you take advantage of the professional crossover design services offered by companies such as Madisound Speaker Components, Solen Electronique, et al., or even have such companies design your entire loudspeaker system in accordance with your criteria and budget. One other somewhat less expensive alternative is to purchase a pre-designed loudspeaker kit, with or without an included enclosure depending on your woodworking prowess. Whatever choice you make when it comes to DIY loudspeakers be sure to thoroughly do your homework. It’s generally not too difficult (and not too expensive) to build your own high performance loudspeaker system; and doing so can be even more cost-effective when it comes to a larger multichannel loudspeaker system.
######################## RESOURCES ########################
Speaker assemble?
http://answers.yahoo.com/question/index?qid=20070602144000AAsRqgw
What is the best enclosure for sub woofer speakers?
http://answers.yahoo.com/question/index?qid=20080227203259AADT9rS
Does anybody know the meathod to work out the porting for my bass cabenet? [sic]
http://answers.yahoo.com/question/index?qid=20080421141305AAdKp8f
Beginner speaker building kits?
http://answers.yahoo.com/question/index?qid=20070804231636AAypxlo
I need dimensions for a 4 cubic feet speaker box?
http://answers.yahoo.com/question/index?qid=20080406124528AAfNJia
When building speakers how do you calculate volume?
http://answers.yahoo.com/question/index?qid=20080623050134AAqnjd7
Which woofer is better?
http://answers.yahoo.com/question/index?qid=20070302060928AAxAQvq
Were to buy a good 5¼" subwoofer in Australia?
http://answers.yahoo.com/question/index?qid=20080416022750AATYeqP
Need help making my own speakers?
http://answers.yahoo.com/question/index?qid=20080409193652AAZKw3R
How do you make your own sub woofer cabinet?
http://answers.yahoo.com/question/index?qid=20081116140947AAVqJxt
High current amplifier?
http://answers.yahoo.com/question/index?qid=20071214134405AAwsfRj
Loudspeaker Design and Construction Resources
http://docs.google.com/View?id=dhpmqnbb_8cqqcq2gx
Loudspeaker Design Cookbook
http://www.audioxpress.com/bksprods/products/bkaa68.htm
audioXpress (Old Colony) Loudspeaker Reference Books
http://www.audioxpress.com/bksprods/BKSLOUREF.htm
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