Step 15: Enjoy the sweet, sweet music
This array can be used either as a hanging sphere(oid), or as two hemispheres. Either way, the radiation pattern can be quite interesting. I like to put the lids in when they're in hemisphere mode.
You're going to need a few things to use your speakers, now that you've got them.
-- Eight channels of amplification. With the money you saved on speakers, you could by a Stewart DA-70-4 for each hemisphere. Or, to keep the whole thing on the cheap, get four t-amps . Currently, I'm running some class D amplifiers I found on ebay.
-- A source of interesting sound. I am a MaxMSP user, so I've used that software with the nbody~ from the PeRColate collection to create simulated body resonances of string instruments. You can also do this all for free with Pd .
-- I use it to make electronic instruments, or electronically processed acoustic instruments, sound more "real" and blend with other instruments.
You're going to need a few things to use your speakers, now that you've got them.
-- Eight channels of amplification. With the money you saved on speakers, you could by a Stewart DA-70-4 for each hemisphere. Or, to keep the whole thing on the cheap, get four t-amps . Currently, I'm running some class D amplifiers I found on ebay.
-- A source of interesting sound. I am a MaxMSP user, so I've used that software with the nbody~ from the PeRColate collection to create simulated body resonances of string instruments. You can also do this all for free with Pd .
-- I use it to make electronic instruments, or electronically processed acoustic instruments, sound more "real" and blend with other instruments.
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will they be connected in parallel then, and in that case would it still be sufficient just to connect to your amplifier?
Most stereo receivers can have from 4 - 16 ohm nominal impedance speakers connected to its outputs. If the 4 speakers are wired in series the impedance is additive and so 4 * 4ohm speakers = 16 ohms total impedance which will be fine for most receivers. 4 * 8 ohm speakers = 32 ohms which would be too much impedance and, I believe, would seriously degrade the volume though would not damage your amp.
If you were to wire the 4 speakers in parallel this might be a problem as the total impedance is 1/Rtotal = 1/R1 + 1/R1+ .....1/Rn or R1*R2/R1+R2. Using the second equation if you connect 2 - 4 ohm speakers in series you have an 8 ohm circuit. then if you connect these 2 - 8ohm pairs in parallel you will have 8 * 8 / 8 + 8 = 64 / 16 = 4 ohms which will also work with most receivers. If you connect all 4 speakers in parallel then you would have 1/4 + 1/4 + 1/4 + 1/4 = 1/16 ohms and this would not be good for the output transistors of you amp or receiver.
I hope I got this right and it is of some help. I am going to try this myself and use the speakers outdoors hanging from the roof of the porch.