High Efficiency Speaker Asylum

RE: TAD Crossover Question

143.236.35.203

In Reply to: RE: TAD Crossover Question posted by airwise on July 13, 2007 at 02:12:46

I would NOT recomend a 6db per octave slope with a single cap in series
Tad recomends this driver at
600Hz to 20,000Hz

I would highly consider going with a steeper slope or a higher xover
point if you insist on a 1st order slope

Considering the price of those drivers and the diaphragms you might
want to consider 12db per octave or 24db per octave at that xover point

Follow Ups:

RE: TAD Crossover Question - airwise 14:46:06 07/13/07 (2)
Hi Stuart,

thanks for the reply. I have a single cap in series but also use a first order slope on the active crossover. The active slope kicks in at 750hz. The series cap, at about 300hz. Would this not increase the slope below 300hz?

I'm also paranoid about the diaphrams, but they are rated at 60w and I'm never putting more than 1 watt through them I would imagine. Do you still think there is a risk?
- RE: TAD Crossover Question - John Sheerin 06:10:18 07/16/07 (1)
  The risk is mechanical damage, not thermal damage. If they're low Q drivers (not all compression drivers are) then at some low frequency, 1 watt might be enough to cause mechanical damage. What is really probably a risk is that the single series cap removes most electrical damping provided by the amp at low frequencies, so the diaphragm can be modulated by pressure from your low frequency section. However, if you're not running at live concert levels, it's probably not a big issue either. If you want to reduce said risk, either use a second order filter with an inductor in parallel or take out the cap and increase to a second order active filter (which will keep excursion constant or reduce it below resonance).
  - RE: TAD Crossover Question - airwise 14:53:15 07/16/07 (0)
    Thanks John. I apreciate all the input but have been thinking this through.
    
    Doing the sums, I'm fairly convinced that there is no greater risk to the 4003 running this solution of effectively two seperate isolated poles and it sounds so much better than the 2nd order alternative.
    
    Bearing in mind that listening at 106db at the listening position would draw less that 1 watt, and that the drive unit is rated to 60w, I don't think the remote possibility of it receiving 1db more at 400hz is likely to cause damage.
    
    famous last words......

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