Hello, here in Brazil is so hard to find good quality speaker drivers, even harder is to match a tweeter and woofer impedance to 4 or 8 ohms (my amp impedance), the final impedance will be 2-3 omhs or above 10 ohms by connecting in series or parallel.
I just read about L-pad for crossover and that its used to match the speaker impedance. Is that right? Do you guys recommend using L-pad to set the speaker final impedance and to match it to the amp impedance?
I just read about L-pad for crossover and that its used to match the speaker impedance. Is that right? Do you guys recommend using L-pad to set the speaker final impedance and to match it to the amp impedance?
With a crossover, the impedances of the two drivers don't combine in parallel (or series).
At LF, the impedance seen by the amp is only that of the woofer, and at HF the amp
sees only the tweeter's impedance.
Out of band, the input impedance of the woofer crossover section rises.
Out of band, the input impedance of the tweeter crossover section also rises.
In parallel, the input impedance of the combination is (more or less) constant.
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Since you are a new member, I won't take anything for granted and would just like to make sure that you are aware of the difference between a crossover network and an L-pad.
The crossover divides up the input and sends the low frequencies to the woofer and the high frequencies to the tweeter.
As a tweeter is usually more sensitive than a woofer, an L-pad is connected between crossover and tweeter to reduce its output to match that of the woofer.
The following links show the basic circuits and the required calculations:
2 Way First Order Speaker Crossover Calculator
ERSE - Crossover Calculator - L-Pad Attenuation
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