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Thread: LS70 Update

  1. #1

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    Default LS70 Update

    I was planning to update the XO in my CS350LS with a Dayton 5.6cf Cap.

    I am thinking while I'm at it, I should update my LS70's as well with a Dayton 6.8cf. What else should I consider doing?
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    Replace all resistors with Mills MRA12s in the same value. And maybe consider using sonicaps instead of daytons :)
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  3. #3

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    Thanks Quad

    I was looking at this older post
    http://www.polkaudio.com/forums/show...ighlight=cs350
    where Ben had done a CS350 and that looks like a tight squeeze for the Dayton cap. Looks like the Soniccap is slightly larger and would need alternate placement.

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    I concur with what Quadzilla said. I installed sonicaps in my LS70's and they sound better than ever. Good luck, you'll be glad you made the change.
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    Clarity Caps would be another good choice.
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    I was speaking about the CS350 being a tight squeeze for the Sonicap. Look at the picture in link above and you can see the Dayton Ben put in there is touching the binding posts. I suppose I can hang it outboard a little.
    I will definitely be using Sonicaps in my LS70's and replacing the one resistor with a MRA12. I'll get the single 5.6uF for the CS350 and make it work.

    Thanks!

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    Post pics of what you have and the xover. Might be able to suggest alternative placements. For example, maybe you could stand it up on end or something..... Sold my 350, so I don't have one to pull apart and look at.
    Are you part of the dirty digital peasants or a member of the great Analog Master Race?

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  8. #8

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    SonicCraft order placed. Given their proximity I should have it in a day or two. I'll post pics when I begin the update for the 350. Might be a day or two later before I do the LS70's.

    Having never looked in the 70's, will the XO be accessible by pulling the binding posts, or do I need to pull a speaker to get at it?
    Polk Audio SDA SRS 2.3TL
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    SVS PB12-ISD Sub
    Onkyo TX-NR808
    Adcom 555II
    Sony PS3

    WANTED: Ebony LS90's

  9. #9

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    Assuming no production changes and your LS70's are the same as mine, you'll be able to access the crossover by removing the binding post assembly from the back of the speaker. The crossover is attached to the other side of the plate. After an hour or so of disassembling, solder slinging, and assembling, both speakers were up and running.
    NEW P-3 Pre: RCA 12BH7 2 X Brimar CV4034's
    Cary SLA70B Signature V2 Amplifier: 2 X Mullard G32's, 2 X RCA/GE 5691's, 4 X SED 6550's

    Cambridge Audio 640C V2 CD Player & Dacmagic DAC

    Rega Planar 3: Deep Groove Subplatter, P3 Motor
    upgrade, Rega Exact, JA Michell counterwieght, Cardas tonearm wiring and Mapleshade stand

    Monolithic Sound PS-1 phonostage with HC-1b power supply

    Polk Audio LS70's

    H.H. Scott 330D AM/FM Tuner with H.H. Scott 335 Multiplex adaptor.

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