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Can the Seas 27TDC be crossed as low as the 27TDFC if its not being played loudly?

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  • #1

    Can the Seas 27TDC be crossed as low as the 27TDFC if its not being played loudly?

    Hi everyone, I'd like to try and make a two way based on the Dayton RS180 and the Seas 27TDC which has no ferrofluid. I see some build already using the 27TDFC so i'm thinking maybe I can follow that lead and see how it goes. I will be using the speakers in a 10x11 room so not big room and I doube its ever going to hit more than 90db in its life.

    What do you guys think? The other option is to take the crossover frequency just a tad higher on the woofer and also on the tweeter (say by 0.2Khz)?
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  • #2
    Re: Can the Seas 27TDC be crossed as low as the 27TDFC if its not being played loudly

    This might be helpful.
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    http://www.audioheuristics.org/measurements/Testing/Tweeter3/seas_comparison.htm
    ~99%
    Make me an angel that flies from Montgomery
    Make me a poster of an old rodeo
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    • #3
      Re: Can the Seas 27TDC be crossed as low as the 27TDFC if its not being played loudly

      Why do you think the 27TDC can't cross as low as the 27TDFC and play as loud?

      Mark K. tests show very little difference between the two, and he tested at 106db/0.25m. I think the RS180 run full range in a large ported enclosure will run pass xmax before the tweeter, depending on the XO frequency.

      See Mark's testing here: http://www.audioheuristics.org/measu...comparison.htm

      EDIT: You win Bob.
      "I have not failed. I've just found 10,000 ways that won't work." Thomas A. Edison

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      • #4
        Re: Can the Seas 27TDC be crossed as low as the 27TDFC if its not being played loudly

        :p


        EDIT: You win Bob.
        ~99%
        Make me an angel that flies from Montgomery
        Make me a poster of an old rodeo
        Just give me one thing that I can hold on to
        To believe in this livin' is just a hard way to go

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        • #5
          Re: Can the Seas 27TDC be crossed as low as the 27TDFC if its not being played loudly

          Well I thought because of the higher peak at resonance and the fact that there is less cooling due to the lack of ferrofluid that I might overheat the coil if its handling the same low crossover point.


          Originally posted by AJ View Post
          Why do you think the 27TDC can't cross as low as the 27TDFC and play as loud?

          Mark K. tests show very little difference between the two, and he tested at 106db/0.25m. I think the RS180 run full range in a large ported enclosure will run pass xmax before the tweeter, depending on the XO frequency.

          See Mark's testing here: http://www.audioheuristics.org/measu...comparison.htm

          EDIT: You win Bob.

          Comment

          • #6
            Re: Can the Seas 27TDC be crossed as low as the 27TDFC if its not being played loudly

            Originally posted by contoursvt View Post
            Well I thought because of the higher peak at resonance and the fact that there is less cooling due to the lack of ferrofluid that I might overheat the coil if its handling the same low crossover point.
            No data to back up my assumption, but I think you will exceed tweeter xmax before running into thermal issues; especially with a low XO point as is required for the RS180.
            "I have not failed. I've just found 10,000 ways that won't work." Thomas A. Edison

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            • #7
              Re: Can the Seas 27TDC be crossed as low as the 27TDFC if its not being played loudly

              You could run a tweeter without a cross over depending on how loud (and clean) you wanna play it. So the question is how loud and how low. If modelling, look at the area under the raw tweeter curve and the area under the filtered tweeter curve. Or the transfer function. Consider the frequencies you're attenuating. How much padding? What listending distance? Etc.
              https://www.youtube.com/channel/UCm2...oSKdB448TTVEnQ

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              • #8
                Re: Can the Seas 27TDC be crossed as low as the 27TDFC if its not being played loudly

                Hmmm ok that makes sense. Well I suspect it should be ok from what is being said because its not a big room and I generally listen to music in the anywhere from low 70's to mid 85's db.... so not very loud.

                If I guess if in the end I'm hot happy, I will try and use the tweeters along with the pair of vintage 8" that were used in some Camber speakrs - same as the one in this link.
                Error Page | eBay
                http://www.ebay.com/itm/one-Camber-Cast-Woofer-mid-Bass-Speaker-/220792088293


                When i did some quick measurements, they had a very clean rolloff around 2.2Khz without any spikes later on that I could detect on an RTA. FS was 39Hz, QTS was .41 and I dont recall what the VAS was but according to your standard box building app, it wanted a fairly large vented box of around 2.4cf or something.


                Originally posted by ryanbouma View Post
                You could run a tweeter without a cross over depending on how loud (and clean) you wanna play it. So the question is how loud and how low. If modelling, look at the area under the raw tweeter curve and the area under the filtered tweeter curve. Or the transfer function. Consider the frequencies you're attenuating. How much padding? What listending distance? Etc.

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