Single LSi series wiring

okiepolkie
okiepolkie Posts: 2,258
edited September 2004 in Basic Hookup/Wiring Questions
Is it possible to wire a single LSi speaker in series to create a lower impedence(meant resistance)(such as 6 or 8 ohms)? The diagram I tried on the testing page should show what I would like to know.

http://clubpolk.polkaudio.com/forum/showthread.php?s=&threadid=22081

My reciever handles 4ohm loads, but I have seen this concern posted on several forums about these speakers and wanted to know if this was a viable solution.

I'm just trying to learn a little more about internal wiring and resistance of electronics.

Thanks for the help.

Don't know if I like my LSi7's yet. Still breaking them in.
Tschüss
Zach
Post edited by okiepolkie on
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Comments

  • Tour2ma
    Tour2ma Posts: 10,177
    edited September 2004
    Just when you think...

    This is a poser. Clearly two parallel circuits are being put in series, so impedance-wise the load must rise (not fall as stated). Real question in my mind is what happens music-reproduction-wise...

    At first glance I'd think the tweets' high pass "filter" will diminish the LF, but then I start looking at the impact on the voltage potential and confusion sets in. So I'll leave it for one of the EE-types on the site... Just a lowly ChemE here...

    Interesting question...
    More later,
    Tour...
    Vox Copuli
    Better to remain silent and be thought a fool, than to open your mouth and remove all doubt. - Old English Proverb

    "Death doesn't come with a Uhaul." - Dennis Gardner
    "It's easy to get lost in price vs performance vs ego vs illusion." - doro
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  • RuSsMaN
    RuSsMaN Posts: 17,987
    edited September 2004
    The answer is no. Will it play? Maybe. The LSi's are designed in absolute phase, going with your diagram, you will more than likely bypass / alter the crossover points.

    If you are worried about impedance, just wire them normally, and put a big 4ohm resistor inline on the positive wire.

    Cheers,
    Russ
    Check your lips at the door woman. Shake your hips like battleships. Yeah, all the white girls trip when I sing at Sunday service.
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  • okiepolkie
    okiepolkie Posts: 2,258
    edited September 2004
    Thanks guys. Like I said, it doesn't really affect me. I wasn't sure about the crossover setup inside the speaker and the replies helped out a lot.

    Will the 4 ohm resistor inline degrade sound quality at all, or just let the amp run cooler?
    Tschüss
    Zach
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  • gatemplin
    gatemplin Posts: 1,595
    edited September 2004
    As others have said, the diagram you drew will not work. You are putting parallel filters in series. You will alter the crossover points as Russ said.
    Will the 4 ohm resistor inline degrade sound quality at all, or just let the amp run cooler?

    I have not tried this before, but I dont think this will help much. By adding a resistor, the amp will see 8 ohms, but the speaker will be less efficient, so you will turn up the amp and run it even harder.

    Just run it on the amp normally, if it shuts down, then save up for a new one or get different speakers.
    Graham
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  • Tour2ma
    Tour2ma Posts: 10,177
    edited September 2004
    Makes sense...

    If I am following (not a given), then with the series wiring, the extremes will be fine, but doubling filtering would occur in the cross-over frequency range. So in place of a smooth transition (where the tweets and MW's reinforce each other) there will be a "hole". Yes?
    More later,
    Tour...
    Vox Copuli
    Better to remain silent and be thought a fool, than to open your mouth and remove all doubt. - Old English Proverb

    "Death doesn't come with a Uhaul." - Dennis Gardner
    "It's easy to get lost in price vs performance vs ego vs illusion." - doro
    "There is a certain entertainment value in ripping the occaisonal (sic) buttmunch..." - TroyD
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  • gatemplin
    gatemplin Posts: 1,595
    edited September 2004
    doubling filtering would occur in the cross-over frequency range. So in place of a smooth transition (where the tweets and MW's reinforce each other) there will be a "hole". Yes?

    I dont know what would happen. I have been reading about crossover design for about a year now and still trying to understand parallel filters.

    Series filters are much harder to design, and putting parallel filters in series will not work right at all.

    If anyone else is interested in loudspeaker design I found this site very helpful.
    http://sound.westhost.com/articles.htm

    specifically about passive crossovers
    http://sound.westhost.com/lr-passive.htm

    Series vs parallel filters
    http://sound.westhost.com/parallel-series.htm
    Graham
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  • okiepolkie
    okiepolkie Posts: 2,258
    edited September 2004
    Just curious.
    Does anyone have a schematic(or at least a detailed description) of what the LSi7 crossover looks like.
    I was not this interested in my RT5's, but I guess the teacher in me now wants to learn more.
    Tschüss
    Zach
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