First speaker design (crosscover)
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 Multi-Way Conventional loudspeakers with crossovers

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 21st January 2005, 12:14 AM #1 Richie V6   diyAudio Member   Join Date: Nov 2004 Location: In my dreams First speaker design (crosscover) Hi, I am a noob at speakers but i figured id give it a try. I am looking to build something for my computer. I am planing to use 2 Vifa midbasses in series and a Dayton tweeter. Vifa Midbass http://www.partsexpress.com/pe/showd...number=299-495 Dayton tweeter http://www.partsexpress.com/pe/pshow...number=275-030 I looked at the Vifa's response graph and saw that response graph dropped off around 800Hz. This is where I set the crossover point. I used a online calculator and calculated the capactior and inductor values for this frequency. Given: RH = 6 ohms RL = 12 ohms f = 800 hertz Solution: Linkwitz-Riley: C1 = 1.6583333333333E-05 farads C2 = 1.6583333333333E-05 farads L1 = 0.00238725 henries L2 = 0.0047745 henries Bessel: C1 = 1.9E-05 farads C2 = 9.5E-06 farads L1 = 0.002067 henries L2 = 0.004134 henries Butterworth: C1 = 2.34375E-05 farads C2 = 1.171875E-05 farads L1 = 0.00168825 henries L2 = 0.0033765 henries I than ran these values in a ORCAD simulator to see the crossover. http://www.geocities.com/newsrichie/...crossover.html After looking at all 3 simulation I have no idea which one is better. I was just wondering if you guys could give me some pointers and tell me if I am on the right track or not. Thanks -Rich
 21st January 2005, 12:32 AM #2 pinkmouse   diyAudio Moderator     Join Date: Apr 2002 Location: Rotherham, England For a start, looking at the specs of the tweeter, its Fs is about 1.8Khz, so you really want to crossover way above that, possibly around 3.6K. 800Hz is far too low... __________________ Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
 21st January 2005, 12:37 AM #3 Richie V6   diyAudio Member   Join Date: Nov 2004 Location: In my dreams Is that a bad tweeter choice?
 21st January 2005, 01:52 AM #4 Ron E   diyAudio Member     Join Date: Jun 2002 Location: USA, MN Well, you obviously made a mistake in your L-R calculation - the two legs should be symmetrical and should cross at -6dB or 10V. First, you need to cross over higher as the others said - the recommended minimum for a 3/4" tweeter is typically 3kHz or 2X the resonant frequency - -whichever is higher. Which crossover you should use depends on the drivers - you really can't build speakers with textbook crossover formulas because the electrical filter cascades with the natural roloff of the drivers to give you your total crossover slope. Linkwitz-Riley makes a good target response in a crossover optimizer because it sums flat - do a trace with the sum of the lowpass and highpass slopes to see for yourself. Try looking at speaker workshop and the various accessories you will need. If you have the patience to use the program, you can make truly excellent speakers. __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Armaments, universal debt, and planned obsolescence--those are the three pillars of Western prosperity. —Aldous Huxley
 21st January 2005, 03:05 AM #5 Richie V6   diyAudio Member   Join Date: Nov 2004 Location: In my dreams thanks for the advice guys. i know formulas arent great, but i am just trying to get my feet wet. i like how my 2 Vifa's sound just wire in series on my desk how does this updated version look? http://www.geocities.com/newsrichie/...dcrossover.GIF
 22nd January 2005, 06:55 AM #6 Richie V6   diyAudio Member   Join Date: Nov 2004 Location: In my dreams BUMP anything else before i place my order?

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