Passive crossover question - AVS Forum
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post #1 of 9 Old 01-01-2013, 09:39 PM - Thread Starter
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I have taken my old soundbar apart for a project and I was wondering if there is a way to tell what ohm the crossovers are that are in it. I have a digital meter if that helps.

Each cross over has 2 woofers and 1 tweeter. The 2 woofers are 4ohm wired in series for 8ohm and the tweeter is 6ohm. Not sure if that helps.

Any info is appreciated.

TV: Toshiba 46L5200U (ISF calibrated)
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NAS: WD MY NET N750 w/ 1.5TB
Rcvr: Harman/Kardon AVR 1700 | Turntable: Audio Technica LP60
Front: Polk Audio T15 | Center: Polk Audio CSR | Rear: Curtis POS's
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post #2 of 9 Old 01-01-2013, 10:02 PM
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I'm not sure what you're asking?
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post #3 of 9 Old 01-01-2013, 10:05 PM - Thread Starter
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Basically, does the crossover have its own ohm rating or is it just whatever the 8ohm + 6ohm of the speakers comes out to? If the crossover has its own ohm rating, how do I figure out what it is?

TV: Toshiba 46L5200U (ISF calibrated)
Bluray/Stream/Game: PS3 (1.5TB storage)
Conditioning: Belkin PureAV PF30
NAS: WD MY NET N750 w/ 1.5TB
Rcvr: Harman/Kardon AVR 1700 | Turntable: Audio Technica LP60
Front: Polk Audio T15 | Center: Polk Audio CSR | Rear: Curtis POS's
Sub: Logitech Z2300
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post #4 of 9 Old 01-01-2013, 10:08 PM
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Ok, the cross over does create an impedance curve which has an ohm rating, but changes with frequency. You would have to measure the impedance of the speaker to get that. It's not just a number.

Hopefully that helps. Why do you want to know this? Perhaps there is an underlying concern/question?
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post #5 of 9 Old 01-01-2013, 10:17 PM - Thread Starter
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Well the receiver I'm wanting to connect them to can handle 6 or 8 ohm, so I am wanting to make sure I won't do any damage to it. So I was hoping I could figure out what the load would be before connecting anything.

TV: Toshiba 46L5200U (ISF calibrated)
Bluray/Stream/Game: PS3 (1.5TB storage)
Conditioning: Belkin PureAV PF30
NAS: WD MY NET N750 w/ 1.5TB
Rcvr: Harman/Kardon AVR 1700 | Turntable: Audio Technica LP60
Front: Polk Audio T15 | Center: Polk Audio CSR | Rear: Curtis POS's
Sub: Logitech Z2300
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post #6 of 9 Old 01-01-2013, 10:48 PM
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Your fine.

The chips in most the receivers are rated down to 3 ohms and can drive stuff even below that. The 6-8 ohms rating is just there because that is the load they will handle without overheating at the max rated power for extended periods of time. The lower the impedance the higher the current for a given power level and with more current come more heat which is the true enemy here.

So stop worrying, plug it in and enjoy.
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post #7 of 9 Old 01-01-2013, 11:14 PM - Thread Starter
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I like it. Thanks for the info guys.

TV: Toshiba 46L5200U (ISF calibrated)
Bluray/Stream/Game: PS3 (1.5TB storage)
Conditioning: Belkin PureAV PF30
NAS: WD MY NET N750 w/ 1.5TB
Rcvr: Harman/Kardon AVR 1700 | Turntable: Audio Technica LP60
Front: Polk Audio T15 | Center: Polk Audio CSR | Rear: Curtis POS's
Sub: Logitech Z2300
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post #8 of 9 Old 01-02-2013, 09:38 AM
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Quote:
Originally Posted by mix1983 View Post

Each cross over has 2 woofers and 1 tweeter. The 2 woofers are 4ohm wired in series for 8ohm and the tweeter is 6ohm. Not sure if that helps.

The nominal impedance of the speaker would be considered 8 ohm in this case. The tweeter being 6 ohm doesn't really matter.
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post #9 of 9 Old 01-02-2013, 04:51 PM - Thread Starter
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Not sure if anyone cares, but this is what all this was about...


The receiver is connected directly to the crossovers inside the soundbar and it is now my (temporary) rears. It is right behind my listening position.

TV: Toshiba 46L5200U (ISF calibrated)
Bluray/Stream/Game: PS3 (1.5TB storage)
Conditioning: Belkin PureAV PF30
NAS: WD MY NET N750 w/ 1.5TB
Rcvr: Harman/Kardon AVR 1700 | Turntable: Audio Technica LP60
Front: Polk Audio T15 | Center: Polk Audio CSR | Rear: Curtis POS's
Sub: Logitech Z2300
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