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Posts posted by JohnA

  1. Power is voltage x amperage. Your amp is spec'd at 180 into an 8 ohm resistor. It might do a little more. More than likely its power supply amd cooling capacity are designed for just that and have little "reserve". The protection circuits are designed to prevent exceeding the amperage that equals 180 watts to prevent overheating. Also the speakers probably dip to 6 ohms in the bass, drawing 50% more current at that point than they would at 8 ohms. That is more current than you amp's cooling and power supply can tolerate. Shutdown.

    BTW, 3/4 "throttle" on every amp is well beyond clipping with most sources. 10 to 12 o'clock in normally full output

  2. The K-77 series are T-35As. Some years, and maybe still, they were tested and hand selected for best performance. The K-55-V was made be Atlas and modified for Klipsch. The K-55-M was made by E-V especially for Klipsch. I was told by E-V that it may have been based on the 1824 or 1828, but was modified to meet Klipsch specs. The K-400 Horn is an adaptation of a dsign Mr. Paul got out of another horn designer's trash can. The K-500 and K-700 are shortened versions of the K-400. It was not intended to be a diffraction horn, though I guess it could have some of those properties. The T-35/T-35A/T-35B/K-77/K-77-M are known as diffraction horns and at lower frequencies they are said to behave that way. However in the band Klipsch uses them they are said to disperse like a normal exponential horn.

    I found flush mounting the K-77-Ms in my La Scalas smoothed their sound noticeably. As an experiment, line the opening in the baffle with heavy felt to reduce diffraction. If you like it Klipsch has brackets used on the K-horn you can use to flush mount you tweeters (after enlarging the hole).


  3. Doug, I think you are heading in the correct direction, but most likely there is a point in the bass where the impedance gets too LOW and the amp is asked for too much current. The protection circuit kicks in to prevent heat damage from overcurrent.

    This is a likely situation. Pioneers of that age were not designed with much excess capacity either in the power supply or the heat sinks.


  4. The Type AL xover is probably most of your problem. It is overly complex, unusually designed and does strange things to the response of the individual drivers. It over controls the system. My rear La Scalas had Type ALs and I though they were squawky, ill-defined in the lower mids and had a screech at high levels. I put ALK xovers in them and almost all of that went away. Damping the horns cured the rest. They are smooth and unaccented, now. The Type AA xover with high quality components is a good sounding xover, but it will have to be adjusted a little for your K-55-M squawker. My front La Scalas have modified Type AAs. Other than the Type ALK, I like the Type AA and Type AK-3, best.

    The AlNiCo tweeter IS a little weak in the upper treble and might also be contributing. The newer K-77-M tweeter is smoother and has more output in the upper frequencies.


  5. your KLF-30s dont *produce8 hiss, they are so efficient they show off the hiss in your receiver. Most A/V gear has it and is must be a product of the DSP. I have some trouble with it in my ACT-3 pre/pro. Acurus says it is a function the gain required to meet some Dolby Digital requirements.

    All you can do is try a different receiver until one suits you.


  6. The '99 drivers have all been unchanged since 1982. The fiberglass squawker horn started well after 1982, but I've never heard when. I doubt you'd improve much going to the aluminum squawker horn. If I had them, I'd listen to them as is for about 6 months before changing a thing. Only make changes to address a shortcoming you hear.

    I have the metal horns in my La Scalas, but damping the tweeter and squawker horns would be first on my list (use rope caulk from Home Depot, it's in the weather sealing dept.), then I'd tightly stuff the HF cabinet with polyester fiberfil from Walmart. Then, make sure the seals between the bass horn and the corner are good and it sits tightly in the corner. Finally, look into Al Klappenberger's replacement crossover. Your's should have Type AK-3 xovers. They are said to sound a lot like Al's, so consider it last.


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