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16 ohm woofers with 8 ohm horns [message #35410]

Sun, 10 March 2002 07:48

frozen
Messages: 4
Registered: May 2009

Esquire

Hi,
Is impedence matching of speakers truly the best way to go? Would it be better to match drivers or can this be taken care of in design of the crossover without bad effects? Does this lead to lower effenciency, Etc. I am still searching for drivers let alone trying to figure out crossovers!
Thanks, Brent

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Motor impedance [message #35415 is a reply to message #35410]

Sun, 10 March 2002 14:31

Wayne Parham
Messages: 18853
Registered: January 2001

Illuminati (33rd Degree)

The crossover needs to be tailored for the load, which is the speaker motor. It's not just advertised impedance, by the way, but rather Re and Le are both significant. In many cases, the mechanical resonance of the motor and it's acoustic environment (horn, reflex, etc.) are important to crossover design too. And the amplifier will transfer power to its load according to its impedance. So these are the things that concern you when choosing drivers of different impedance.

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Re: Motor impedance [message #35417 is a reply to message #35415]

Sun, 10 March 2002 15:36

Adam
Messages: 419
Registered: May 2009

Illuminati (1st Degree)

Yep.

Your amplifier will be driving the woofer at 16 ohms but driving the compression driver at only 8 ohms. The result will be that you will have to increase the amount of padding on the tweeter by 3 db.

Adam

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