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open baffle project

dnewma04 i dont fully understand..

if you took two 16ohm speakers and wired them in paralell to be 8ohms.
how could they move quicker than one of them at 16ohms?
 
When you put 2 speakers in series you increase the inductance, thereby dropping the high end frequency response (lowering max speed).
 
RayW said:
When you put 2 speakers in series you increase the inductance, thereby dropping the high end frequency response (lowering max speed).
Click to expand...

right but the same speakers in paralell..
the total impendence would be lower.. but that wouldent make the speakers any faster would it?
 
Question about the "Edge" program.
I put in a 10" woofer with 24"sq baffle with all other parameters at default because I don't know what they all mean.
Then I get the graph.Is that graph "good"?Why?
How about the first chart? is that showing woofer placement on the 24" sq baffle?
As usual I got it backwards.I was thinking the woofer should be placed toward the floor but the graphic seems to show the woofer in the upper right hand corner.
Then if I enable the OB bass drop compensator the graph goes off the chart.
What does a really good to great sounding woofer graph look like?
Is flatter better?
Anyone?
 
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You'll want a flat line in the area you are using the woofers in. So if you want to go from 40hz to 1000hz with your woofer, you'll want a fairly flat line between those two points. You can click on the woofer and move it around the baffle and then click on apply and see how it effects the responce line.
 
O.K. thanks nagle.
One other item in the OB bass drop compensator schematic is that an op amp in there?
If so which one? Any one I choose?
 
I don't know much about the bass drop comp. That goes before the amp and is used if you use a narrow baffle. Making a larger baffle and off setting the driver does the same thing.
 
If the overall inductance becomes higher through the wiring scheme used, it becomes a higher valued low pass filter than a single speaker. Having higher inductance would cause the effect of the first order low pass filter to start at a lower freq, effectively decreasing it's high freq performance. Read any crossover material for more information. ;)
 
dnewma04 said:
Having higher inductance would cause the effect of the first order low pass filter to start at a lower freq, effectively decreasing it's high freq performance.
Click to expand...

Right you are, but each coil is only seeing half the voltage when in series. Try it yourself and see, the response will be identical. Drivers (woofer, mid, tweeter) in series or parallel will not have their response altered.

Read any crossover / electronic-filter design guides to see why, or ... just try it yourself. :)
 
so what if the speakers are in paralell.. the total impendence seen by the amplifier would be lower but the speakers wouldent move any quicker would they?
because each coil is still the same impendence right?
 
aidynphoenix said:
so what if the speakers are in paralell.. the total impendence seen by the amplifier would be lower but the speakers wouldent move any quicker would they?
Click to expand...

I guess if you keep adding woofers in parallel, and the inductance keeps dropping, and they keep getting 'faster', then at some point they all become tweeters. :P

So, if you have a < 0.1 ohm stable amp, you might never need to buy tweeters for your line array!
:yes:
 
thanks you dnewma04 i see what i was misunderstanding..
but understanding how inductance effects the freq..
doesent exactially explain what i was trying to ask in the begining..

i didnt mean speed as frequency i ment how well the woofer's movement can follow the frequency..
lets say that you are only useing your woofers in the low frequency range..
if you were doing a 1hz test on your woofer, and measuring the speed at which the woofer could move from the resting position to the extended position and back again.
might a lightweight woofer perform better than a heavier woofer?
or does that kind of speed soley depend on the enclosure and airspace/pressure behind and in front of the woofer?
 
aidynphoenix said:
thanks you dnewma04 i see what i was misunderstanding..
but understanding how inductance effects the freq..
doesent exactially explain what i was trying to ask in the begining..

i didnt mean speed as frequency i ment how well the woofer's movement can follow the frequency..
lets say that you are only useing your woofers in the low frequency range..
if you were doing a 1hz test on your woofer, and measuring the speed at which the woofer could move from the resting position to the extended position and back again.
might a lightweight woofer perform better than a heavier woofer?
or does that kind of speed soley depend on the enclosure and airspace/pressure behind and in front of the woofer?
Click to expand...


Let's say you had a 100hz frequency. If one driver played 100hz faster, it would be playing a different frequency. Speed in a woofer is about the woofers high frequency ability and that ability is controlled by inductance.
 
I think of the speed of a woofer or any other driver as its ability to stop and start more percisley (sp) than an other. This can be because of the woofer itself or the amp. So the sound sounds tighter.
 
I'm going from open-baffle to no-baffle. Drivers are Dayton PS-220-8" full rangers. I'm building frames and the drivers will be hung inside by lengths of thin wire. The idea is complete dis-association with ANY form of baffle. I high-pass these at 500Hz. Separate sealed box woofers for <500Hz.

Anyone done the no-baffle boogie before? Results??
 
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