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Old 6th June 2013, 12:42 PM   #1
diyAudio Member
 
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Location: Birmingham, UK
Default Another L-Pad question

I don't usually build passive speakers but this time circumstances demand a passive crossover and an adjustable L-pad so bear with me if it is a bit on the silly side!

The problem is all the L-pads I can find are 8 Ohm but the tweeters I'd like to use are either 4 or 6 Ohm.
With that in mind do I use 8 Ohm or the tweeters actual impedance when calculating the high pass portion of the crossover?

Or should I use a series resistor to bump the tweeter impedance up to 8 Ohm after the L-pad?
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Old 6th June 2013, 03:09 PM   #2
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Quote:
Originally Posted by Charles Darwin View Post
Or should I use a series resistor to bump the tweeter impedance up to 8 Ohm after the L-pad?
Yes, that's what I'd do.

Marco
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Old 6th June 2013, 07:20 PM   #3
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I think I'll end up doing that but just out of curiosity what would happen if I were not to use a series resistor?

I would quite like the opportunity to use the voltage that would be lost across that resistor for the tweeter if at all possible.
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Old 7th June 2013, 02:29 AM   #4
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The L-pad set for no attenuation and full attenuation results in load presented to the high-pass section equal to (respectively) the impedance of the tweeter and 8 Ohm. If the tweeter impedance is 6 Ohm, then you could design the filter with Z = 7 Ohm with probably very little error.

Maybe you would run into problems if the order of the high-pass section is greater than 2nd.
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Old 7th June 2013, 08:25 AM   #5
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Thanks!!!

I wasn't planning on going higher than 2nd for a passive anyways.
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