How multi driver speaker work

brown_matt · Mar 17, 2010

1. The problem statement, all variables and given/known data
For my physics coursework I am researching how multi driver speaker systems try to reproduce the full spectrum of sound, do you know any equations that will help me to describe frequency, and how ultra high and low frequencies can be reached?
Regards,
Matt

2. Relevant equations
Need to know

3. The attempt at a solution
Unable to do without relevant equations
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

turbo · Mar 17, 2010

Re: Loudspeakers

Do you know anything at all about cross-overs? If not, you should Google that and see what they do in speaker systems.

brown_matt · Mar 17, 2010

Re: Loudspeakers

Yes, i've read how they seperate the input into different frequency bands. Are there equations that calculate the maximum frequency of a speaker, or am i being too specific?

turbo · Mar 17, 2010

Re: Loudspeakers

brown_matt said: ↑

Yes, i've read how they seperate the input into different frequency bands. Are there equations that calculate the maximum frequency of a speaker, or am i being too specific?

Actually, not specific enough. Crossovers are engineered to optimize the performance of particular arrays of drivers. Bose has done a lot with full-range drivers, but most speaker-designers want to use a range of speakers, and they have to engineer a crossover network that will give the most accurate response with the selected speaker array. Obviously, you don't want to send very low frequencies (long throw) to tiny dome tweeters, and vise versa. A big heavy subwoofer can't reproduce highs accurately.

brown_matt · Mar 17, 2010

Re: Loudspeakers

Oh right, so full range drivers won't necessarily produce as good a sound as a crossover with subwoofer and tweeters?
Wavespeed = frequency x wavelength
as the waves will be travelling at 330? high note = short wavelength
Where can i go from here to raise the level of physics?

turbo · Mar 17, 2010

Re: Loudspeakers

brown_matt said: ↑

Oh right, so full range drivers won't necessarily produce as good a sound as a crossover with subwoofer and tweeters?
Wavespeed = frequency x wavelength
as the waves will be travelling at 330? high note = short wavelength
Where can i go from here to raise the level of physics?

You're going to have to delve into loudspeaker design, which is a very complex subject, then you're going to have to settle on a basic design and see what you can come up with. There are algorithms that can help you.

Here is a web-site describing the design of a speaker system with a passive crossover.

http://sound.westhost.com/lr-passive.htm

Google on "speaker crossover design" and you'll have more information than you can absorb.

brown_matt · Mar 17, 2010

Re: Loudspeakers

that looks perfect
thank you for your help, hopefully this won't cause too much confusion

beeferer · Apr 6, 2010

Re: Loudspeakers

This will help. I am a newbie here and the reason I joined is because I build speakers- I am especially into designing and building subwoofers. http://www.colomar.com/Shavano/crossover12db.html

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How multi driver speaker work

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