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Posts posted by JohnA

  1. 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.


  2. '79 should be one of the best years. Check to see if the K-55-V has solder terminals. If it does they are the best of the early versions. Avoid the Type AL network. You can change the Type AL to a Klipsch Type AL-3, the latest rev. or to Al Klappenberg's crossovers. Al's crossovers are a just audible tad hotter on the tweeter section than the Type AA and noticably clearer.


  3. I have a set of ALKs in my rear channel La Scalas that had Type AL networks. They work very well. The tweeter is slightly hotter than the front La Scalas with Type AA networks; just enough to tell.

    I looked at it and decided I couldn't buy the parts enough cheaper to make building myself worth the trouble.


  4. More Heresies would be the hot ticket! If you can't work in more Heresies, A KLF-C7 will work well for a center and I'd look at RS-3s for surrounds. I use a KLF-C7 with my 4 La Scalas and it is a pretty good match.


  5. The RSW-15 was VERY impressive when used in a 5.1 system with Jubilees as mains, K-horns (or a series of Heresies) as rears and a Belle as a center. It had the output capability to match the Jubilees. When pushed really hard, its distortion was probably higher than optimum, but it was not objectionable. At sane levels it sounded nice and it could move air! I'd have one.


  6. One good speaker wire per speaker is enough.

    Biwiring is running 2 wires from the same amp terminals to each speaker. The speaker must have 2 pair of terminals for biwiring. One pair connects to the woofer only and the other pair connects to the high frequency drivers. The theory is that large current flow in the bass cannot affect the high frequencies because they are carried in the other wire. I do not believe it is audible.


  7. Tom is generally correct. You will enjoy the addition of subwoofers if they are high output and low distortion. I use 2 VMPS Larger Subs with my La Scalas. The subs are placed in corners and powered by an Acurus amp capable of more than 400 watts/channel. They seem to keep up pretty well and the distortion is low.

    The Larger Subwoofer has a 12" and a 15" active driver and a 15" passive radiator that's slot-loaded.


  8. The square tweeter is a K-77-M. It was probably a replacement for a defective K-77. The K-77-M has more and smoother VHF performance.

    Only damp the back (out) side of the horns and don't remove the tweeter's magnet. It isn't supposed to come off.


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