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what cap value for 2 ohm 6x9's?


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joeyk 
Member - Posts: 6
Member spacespace
Joined: February 20, 2006
Location: United States
Posted: February 25, 2006 at 11:52 PM / IP Logged  
Hehe, I wouldn't suppose it'd be time effective to explain whythe sombo you suggested would be better than this 500uf non polar electrolitic?
If it takes to long to explain, I understand.
joeyk 
Member - Posts: 6
Member spacespace
Joined: February 20, 2006
Location: United States
Posted: February 26, 2006 at 12:02 AM / IP Logged  
Ah, I did some research & answered my own question, which leads to another...
If I go with 2 Elect's & 1 poly. will my sound quality suffer at 150hz cutoff? I see it's less of a negative effect on lower frequencies. Will there be a big diff. between this route & going all poly? (I know the all poly route will be expensive but just want to weight the cost versus quality)
Thanks so very much if you could answer this for me. I really do appreciate it. I'm learning way more than I ever thought I would this quickly by joining this forum. This site is just excellence in electronic education!
stevdart 
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Joined: January 24, 2004
Location: Pennsylvania, United States
Posted: February 26, 2006 at 12:45 AM / IP Logged  

Glad you're getting benefit from using this forum.  It's a great place.

It's all about prohibitive cost.  You weigh the price with the value it provides.  Most people would install one 250 uF non-pol electrolytic and be done with it.  I would use the bundle of three that I recommended, using the higher quality poly cap as a "bypass cap".  I wouldn't spend the money required for all poly for what you're doing.  And that still might be overkill in this situation because

  • you don't know what the actual impedance is at the crossover freq.  It might be much higher than 2 ohms at 150 Hz.  There isn't the supporting test data that you need to have to know what it is.
  • using the calc, you can see how the cap value changes according to the impedance at the crossover point.

You'll probably not notice a difference in sound in this application using the different quality caps.  You might have to end up experimenting a bit with cap values because of the question of the impedance.  A non-polarized electrolytic cap is relatively cheap and would be the type you would want to use if you had to switch out the value (had to buy replacement caps).  So, you're best bet is to just put a 250 np cap on each one and see what it sounds like.  If it's not solving the problem, switch to a 150 uF np cap and try that.

OOOPS  I'm going to look this over.  I linked you to a calculator for 2nd order crossovers what cap value for 2 ohm 6x9's? - Page 2 - Last Post -- posted image..

Here's one:  http://www.mhsoft.nl/spk_calc.asp#crossover  First order crossover is indeed over 500 uF at 2 ohms, 265 at 4 ohms.  But I suspect at that freq the impedance is rising rapidly and is well over 2 ohms.  I don't think you would have to be anywhere near 500 uF for your cutoff target.  Try the 250 first because I suspect the impedance is probably closer to 4 ohms at that point.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
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