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JohnA

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Posts posted by JohnA

  1. I use a KLF-C7 as my center channel with La Scalas as mains and surrounds. The C7 is a pretty good match, if not perfect. A Heresy from the same year would probably be better. I was looking for Heresy surrounds when I found the rear La Scalas cheaper.

    I use a pair of VMPS Larger Subs driven by a power amp that supplies about 400 watts to each one. When in the corners, they can keep up with the La Scalas. At sane volumes and below their distortion is low enough that they blend well with my La Scalas. Your biggest problem is going to be finding a sub(s) with enough low distortion output to keep up with La Scalas.

    John

  2. A small amount of difference is often the voice coil rubbing, probably due to excessive heat. For a really large difference in output I'd look at the crossover for bad solder joints or bad components. first swap the K-55-V from one speaker to the other. If the low output moves it's the driver. You should be able to get it overhauled for about $75.

    John

  3. Ray,

    The published graphs of the La Scala I have show it is at least as smooth as the K-horn above 60 Hz. Below that the response drops like a bluff. The La Scala has a 1 or 2 dB hump about 200 Hz that would make the La Scala sound a little "warmer" than the K-horn, but they are remarkably similar in response (above 60). The 45 Hz rating seems iffy.

    John

  4. I'm considering a new DVD player to replace my Sony DVP-S3000. It's not old but will not pass DTS on DVDs. It sounds great on Cds and I don't want to give that up, either. There was a thread on this BBS about DVD players, but I can't find it.

    Where can I find DVD player tests to help with my evaluation and what is the Chroma Bug?

    John

  5. Horns have a low frequency cut-off based on their dimensions (length, mouth area, etc.). Some Heresies used a K-55-V squawker driver with their K-600 horn. The K-55-V is capable of going down to 110 Hz, but the K-600 is not. It is intended for use above 600 Hz. It's true cut-off is probably 450 to 500 Hz; somebody will know. Below the true cut-off frequency the driver diaphragm will unload, there will be little output and it can be damaged by excessive excursion.

    You must be intending to use the squawker and tweeter near your TV and let your sub pick up the lower frequencies. It would be a VERY unusual sub that could hit 600 Hz. I think you'll be disappointed with the results. I'd keep the Heresy intact and crossover to the sub at 100 Hz, or get a real center channel.

    While it would probably be better for your amp and would make the crossover behave as designed, I don't think inserting a resistor in place of the woofer is necessary. You would need a very high power resistor to ensure it didn't burn out.

    Squawker is a term coined by Mr. Paul, so we all seem to keep using it.

    John

  6. A woofer's excursion increases as the frequency goes deeper.

    To test the phase of the woofer, use a 1.5 volt battery and connect it to the terminals. When the + terminal of the battery is connected to the + terminal of the driver, the cone will move forward. Normally the - terminal of the speaker wire connector is connected directly to the - terminal of the woofer and the active elements are on the positive side of the circuit. There is no reason for this, but it seems to be habit. Expect black wires from the crossover to be negative, but be sure to connect both speakers the same way.

    John

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