For Trey & Ben - JBL L166 Crossover Upgrade?

PrazVTPrazVT Posts: 1,608
edited July 2011 in DIY, Mods & Tweaks
My dad has been impressed w/ the XO mods on my LSi9s - and for someone who lectures me on spending money on audio stuff, he's been impressed w/ m 2ch and HT setups.

I was wondering how feasible it would be to do it - I've never cracked open those big boys so not sure how clean the xo setup is. Thoughts?

I think below is the circuit diagram and perhaps some stock crossovers for the L166s, as well as the speakers themselves. His are in great condition - I figure if he refuses to part with them, perhaps they can be upgraded ;)

Just an idea...
ALL BOXED UP for a while until I save up for a new place :(

Home Theater:
KEF Q900s / MIT Shotgun S3 / MIT CVT2 ICs | KEF Q600C | Polk FXi5 | BJC Wire | Signal / AQ ICs | Shunyata / Pangea PCs | Pioneer Elite SC 57 | Parasound NC2100 Pre | NAD M25 | Marantz SA8001 | Schiit Gungnir DAC | SB Touch

2 Channel:
Polk LSi9 (xo mods), Polk DSW MicroPro 2000 sub | NAD c375BEE | W4S DAC1 | SB Touch | Marantz SA-8001 | MIT AVt 2 | Kimber Hero / AQ / Signal ICs | Shunyata / Signal PCs
Post edited by PrazVT on

Comments

  • VR3VR3 Posts: 23,795
    edited July 2011
    We can make it happen! :)
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
  • PrazVTPrazVT Posts: 1,608
    edited July 2011
    I had a feeling you'd be up for this - thanks! I'll take a closer look at the speakers this weekend - perhaps crack them open and take some photos. Most probably it'll be a month or two before he can do this, but I thought I'd quietly start the pre-work.
    ALL BOXED UP for a while until I save up for a new place :(

    Home Theater:
    KEF Q900s / MIT Shotgun S3 / MIT CVT2 ICs | KEF Q600C | Polk FXi5 | BJC Wire | Signal / AQ ICs | Shunyata / Pangea PCs | Pioneer Elite SC 57 | Parasound NC2100 Pre | NAD M25 | Marantz SA8001 | Schiit Gungnir DAC | SB Touch

    2 Channel:
    Polk LSi9 (xo mods), Polk DSW MicroPro 2000 sub | NAD c375BEE | W4S DAC1 | SB Touch | Marantz SA-8001 | MIT AVt 2 | Kimber Hero / AQ / Signal ICs | Shunyata / Signal PCs
  • VR3VR3 Posts: 23,795
    edited July 2011
    Im down for anything with coils caps and resistors buddy!!

    OH YEAH! Crossovers pump me up!
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
  • zingozingo Audiophile Posts: 11,837
    edited July 2011
    Looks easy enough!
  • PherdPherd Posts: 1
    Hi guys! I just came across this quite old post with the same thing in mind - rebuilding the L166's crossover and then swapping it. Are you still around to share some insights about this project with me?
  • F1nutF1nut Posts: 44,510
    The schematic is listed above showing the value of the 2 caps and 2 resistors. I also noted the sensitivity is rated at 76, 1 [email protected] 3 meters. That's horrible!!!
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."


    President of Club Polk

  • mhardy6647mhardy6647 Posts: 25,403
    edited April 26
    F1nut wrote: »
    The schematic is listed above showing the value of the 2 caps and 2 resistors. I also noted the sensitivity is rated at 76, 1 [email protected] 3 meters. That's horrible!!!

    Something does not seem right about that -- maybe that is the old EIA sensitivity spec, which was something like dB SPL at 30 feet (roughly ten meters, though) at 1 mW input power. https://www.diyaudio.com/forums/multi-way/119152-old-speaker-efficiency-rating-40s-db-print.html

    EDIT: hmm...
    http://www.lansingheritage.org/html/jbl/specs/home-speakers/1976-l66.htm

    page4.jpg

    Yeah, this says 40 to 46 dB EIA (= 89.2 to 95.2 dB SPL @ 1 meter / 1 watt), depending on driver/frequency range, which sounds mo' better.
  • PrazVTPrazVT Posts: 1,608
    Wow I barely even remember starting this thread lol. I didn't end up messing with the speakers as they were okay (still mains in my dad's ht).
    ALL BOXED UP for a while until I save up for a new place :(

    Home Theater:
    KEF Q900s / MIT Shotgun S3 / MIT CVT2 ICs | KEF Q600C | Polk FXi5 | BJC Wire | Signal / AQ ICs | Shunyata / Pangea PCs | Pioneer Elite SC 57 | Parasound NC2100 Pre | NAD M25 | Marantz SA8001 | Schiit Gungnir DAC | SB Touch

    2 Channel:
    Polk LSi9 (xo mods), Polk DSW MicroPro 2000 sub | NAD c375BEE | W4S DAC1 | SB Touch | Marantz SA-8001 | MIT AVt 2 | Kimber Hero / AQ / Signal ICs | Shunyata / Signal PCs
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