1.2TL crossover frequency

Janne
Janne Posts: 139
edited February 2011 in Vintage Speakers
What is the Low/High crossover frequency for our 1.2 TL's? I am playing with the thought of bi-amping using my room correction system that has an electronic crossover. I wanted to try using the MC500 for the low and use 2 of the MC206's channels for the high. If it turns out good maybe get another MC500. Not sure what power ratio you would need for bi-amping the 1.2TL's
Of course I would need to install the additional terminals that I removed again because "I would never bi-amp" :redface:
HT/2 CH
McIntosh MX120, MC500, MC206, MEN220
polkaudio SDA SRS 1.2TL, XO, Inductor, Tweeter, Larry's rings, WBT Binding posts, Moretite and Dynamat mod. Built by Mollie Jones 27:th of February 1991, CS350-LS XO mod, LS-f/x, DSW MicroPro 4000
MIT Shotgun S3.3 Bi-wire SC, Shotgun S3.3 SC, Shotgun S3.3 Proline IC, Shotgun S3.3 IC, Shotgun S3.3 Sub cable, AVT 1 Optical IC, EXP 3 Speaker interconnect.
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  • Face
    Face Posts: 14,340
    edited February 2011
    Have you seen the 1.2TL's crossover? Active is out of the question unless you have a lot of spare time and 12 channels of amplification.
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
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  • Janne
    Janne Posts: 139
    edited February 2011
    Maybe I misunderstood. I read somewhere that it was better to chop up the signal in the electronic crossover before it was sent to the passive crossover on the speakers. So you recommend just go full frequency on both high and low and let the speaker do the job?
    HT/2 CH
    McIntosh MX120, MC500, MC206, MEN220
    polkaudio SDA SRS 1.2TL, XO, Inductor, Tweeter, Larry's rings, WBT Binding posts, Moretite and Dynamat mod. Built by Mollie Jones 27:th of February 1991, CS350-LS XO mod, LS-f/x, DSW MicroPro 4000
    MIT Shotgun S3.3 Bi-wire SC, Shotgun S3.3 SC, Shotgun S3.3 Proline IC, Shotgun S3.3 IC, Shotgun S3.3 Sub cable, AVT 1 Optical IC, EXP 3 Speaker interconnect.
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  • Face
    Face Posts: 14,340
    edited February 2011
    Janne wrote: »
    So you recommend just go full frequency on both high and low and let the speaker do the job?
    Yes.
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
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  • Joe08867
    Joe08867 Posts: 3,919
    edited February 2011
    Yes let the speaker do the job. The crossover in those speakers is designed solely for them and is tailored to the speakers in the cabinet.

    Also, your correction software will not be able to reproduce the SDA effect. It will wreck the whole idea of those speakers.

    Chopping up the signal refers to bi-amplifying the speakers. It sends the lows and lower midrange frequencies to the woofers and the upper midrange and higher frequencies to the tweeters. It can work extremely well, but the amps really need to match for it to work right.

    If you want to look into upgrading the crossover that is a different story as parts in them get old and wear out in time. I was amazed with the sound of my speakers after I redid the crossovers.
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  • TrashyTrucker
    TrashyTrucker Posts: 225
    edited February 2011
    If i am not mistaken, Janne was wondering if they should filter out the signals before the amps? I biamp and have always wondered that as well. However Janne, I let my twin Hafler's (one for highs, one for lows) have full signal range (As the others mentioned...)
    and let the passive Xo's do their job.


    hope that helps,
    Matt :biggrin:
    Integra DTR 50.2 used as a preamp
    Rotel RCD 1520 cdp
    AudioQuest Jaguar 72v dbs ic's
    AudioQuest type 8 wire
    biamped to:
    2-Hafler 9500 trans nova's
    AudioQuest NRG-3 power cable's
    dedicated AC line for
    Tesla Plex 20a duplex receptacle
    Panamax Max 7500 pro surge/line conditioner
    SDA SRS 3.1 TL's modded...
    spikes, rdo's, rings, dynamat, sonicaps, mills & aeon
    Panasonic Viera G20 50" plasma


    ...SDA's are just like candy for your ears...
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