Someone explain diff between Lsi9 and LsiC crossover?

jrlouie
jrlouie Posts: 462
edited October 2005 in Speakers
I've read all the posts about various people switching out the LsiC crossover with one from an Lsi9. But when I read the specs online, or download the pdf files, or look at the paper manuals that came with my speakers, they all indicate the Lsi9 and LsiC have the same frequency slopes.
Crossover
Driver 1: LPF at 200Hz, 12dB/oct.
Driver 2: LPF at 2.4kHz, 12dB/oct.
Tweeter: HPF at 2.4kHz, 18 dB/oct.

So what's the diff? Sorry if this has been answered before. I looked around some and couldn't find it.

Thanks!
Post edited by jrlouie on
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Comments

  • jrlouie
    jrlouie Posts: 462
    edited September 2005
    Anyone? Anyone?
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  • Frank Z
    Frank Z Posts: 5,860
    edited September 2005
    Send Ken at Polk CS a PM, I'm sure he'll be able to give you the low down.
    9/11 - WE WILL NEVER FORGET!! (<---<<click)
    2005-06 Club Polk Football Pool Champion!! :D
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  • Ceruleance
    Ceruleance Posts: 991
    edited September 2005
    Please post your answer when you get one. I am very interested in this as I just received an LSiC in the mail with a broken crossover, if there truly is a difference and the Lsi9 crossover is better as some claim then now would be a great time for me to switch.
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  • Mazeroth
    Mazeroth Posts: 1,585
    edited October 2005
    The differences should be minimal. When doing speaker measurements with the drivers inside the box and the speaker in its intended position (LSiC horizontal) the measurements will vary a little bit, due to baffle step compensation (the distance from the woofer to the edge of the speaker cabinet determines how much bass travels behind the speaker) and how horizontal speakers have lobing problems, while vertical MTMs suffer from combing effects. They compensate for this in the crossover. Switching the crossovers, in my opinion, isn't recommended. You will get a less desirable frequency curve, which might, in some cases, sound better to you. Everyones' ears are different.
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  • jrlouie
    jrlouie Posts: 462
    edited October 2005
    Just some info for anyone who has also wondered as I did, here is the response from polk...
    The inductor values are different on the crossovers for the lower bass drivers on these speakers. The value for the LSi9 bass driver is 9.0 Millihenrie and the value for the LSiC bass driver is 8 Millihenrie. Plus the orientation of the inductors on the LSiC crossover is different. The LSiC uses two 4 Millihenrie inductors wired in series and are positioned next to each other, wired out of phase to cancel stray magnet fields radiated from the inductors from discoloring the picture. The LSi9 does not use this type of configuration. I would not recommend installing the LSi9 crossover into a LSiC.The enclosure volumes are slightly different also. The LSiC internal volume is about .5 cubic feet and the LSi9 is about .75 cubic feet.
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