wattage rating of components in crossover (need help)

[eggplant of doom]

So, I'm building this circuit (crossover in fact), but I'm not sure about the wattage rating of practically all components.

C1- 23
L1 -0.5
R1- 1
R2 -1.6
L2 -2.3
C3 -11.6
L3 -10.8
R4 -0.6
C4 -5.1
R5 -14.7

tweeter imedance: 6 ohm
woofer impedance: 8 ohm

Here are the specifications (in pdf) of the tweeter and of the woofer. I wasn't sure which values to take as power and resistance.

TIA
- Jonathan

 

[eggplant of doom]

I'm sorry I'm bumping this, but it's just realy important and urgent. I need to get started on this asap, and the wattage rating is the only thing I don't know.

 

[SnoopyRocks]

You're going to have to do the work yourself (unless some kind soul really feels like working through it). I suggest entering the circuits into one of the free circuit simulators (eg from linear.com) and simulating them. This will give you the voltage and current through each element, from which you can calculate the power at full load. To be safe, use elements rated for 3x (or more) the maximum power they encounter.

It would help if you were to specify what the units are for your component values so people don't have to guess. Is C1 23F, 23uF, 23fF, etc.?

 

[eggplant of doom]

Oh sorry, I thought I did.
All capacitors are in uF, resistors are in ohms and inductors are in mH.

 

[nikongod]

easy answer: buy larger or similarly capiable values to your sterio componentry.

caps are typpically referenced as "voltage spec" vs power handling. ie a 1000V cap is good to put a 1W signal through (number deliberatly very wrong) inductors are speced by winding-wire-guage vs power.

from the values you post, if you want 200W in your "tweeter" you will probably need to put over 1000W intot he circuit. the 1.6ohm resistor in your zobel (i think) filter will suck down ALLL of the current, very little (1/6 or so) will go to the tweeter.

 

[eggplant of doom]

The value near the tweeter is what I understood (and it's quite possible I'm mistaken) to be the maximum wattage the tweeter will handle, and I thought that from there I could deduct what power handling capabilities the other components should have. Akain I could be totally off-course here. Read the driver parmeters for the actual specs.

 

[amb]

The "200W" and "100W" ratings of the drivers are rather meaningless figures to work with except to gauge the relative power handling capabilities between different drivers that use similar IEC test standards.

The only parts that have wattage ratings in the crossover are the resistors, and in your case, 10 watt power resistors are probably sufficient for each of them (this is just from personal experience of building similar crossovers, not from actual calculation of your circuit. You could probably get away with lower ratings with some of these, but you'd have to calculate how much power is going to be dissipated in each part of the circuit). Your resistors are going to "see" only music signals pass through them, and thus aren't going to be subjected to continuous dissipation. The drivers themselves will probably be damaged from being overdriven long before the resistors would burn up.

For the capacitors, use parts rated at over 100V, and if possible, good quality film types.

For the inductors, use those that are rated for as low a DC resistance as possible, and use air-core type rather than iron-core if possible to avoid distortion from saturation.

 

[eggplant of doom]

Thank you very much for you thoughtful and thorough response.
At last, I understand exactly what I should do.

Jonathan