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JohnA

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Posts posted by JohnA

  1. A voltage is positive or negative with respect to a reference point, like positive and negative temperatures. It your reference point is 100V (black lead) and the test point is 80V, you'll read -20V. It's a relative thing and can be used to show the direction of moving electrons

    John

  2. UPS won't let you open a C.O.D. box. However, there is a solution. I use iescrow.com. I give them the money, you ship me the stuff. I get 3 days to test the stuff and they then release the money automatically. If during the 3 days I find a problem an e-mail stops payment, but I can't get my money back until you get your stuff back. Tracking numbers establish the location of the goods at any time.

    John

  3. There's a lot of stuff I can't hear or can't hear easily in the room I use. However, I have seen the Dope from Hope introducing the solder terminal -V and it's response curves. The latest -V is obviously smoother than the previous one and has better output from 4k - 6k. That's why I went to the trouble to find a second solder-terminal driver. I expected to hear something, but didn't. Maybe if I had 2 of each and swapped both at once, I'd hear it.

    Why does Klipsch use such a small throat in the K-400? When I first saw it I thought it looked too small, but I barely understand the physics. Is the small throat a way of getting a horn with a 263 Hz cut-off in the space alotted? If the throat were larger and the length the same (with a small increase in mouth size, perhaps) would the cut-off rise to an unacceptable frequency? Specifically, what does the small throat do to sound (velocity too high?)?

    John

  4. Those ARE the late drivers. I have 2 of those and one of the early K-55-Vs. I can't hear a difference other than the fact that the newest late driver has less output than its twin. I have had the disphragm replaced and found the voice coil was rubbing apparently from abuse.

    John

  5. The factory is good sized, but not huge. The warehouse is stacked to the rafters with new product, even the Heritage Series. The atmosphere is casual and comfortable. QA/QC is turned up very high; miniscule dimples I couldn't see cause cabinets to be destroyed. The people at the factory were very friendly, helpful and eager to help me with a pair of grilles I bought. The people there are excellent hosts, but make no mistake, their passion is fine horn speakers and they take that very seriously.

    John

  6. I can't say if the corssover will work, but the K-400 is too long to fit in a Heresy; it and a K-55-V is just short of 24" long. There is a difference in the K-55-V and the -M. The -M is a little more efficient and sounds different. For years Heresies had K-55-Vs on K-700 metal horns. You might want to go that way.

    John

  7. The input impedance for the sub will be so high there will be no power loss to your La Scalas.

    In order to have a chance of keeping up with your La Scalas, you need the biggest sub you can find. I would not consider less than a 15". I have 2 HUGE subs, 42" tall x 21" square made by VMPS. They have a 12" driver, a 15" driver and a slot-loaded 15" passive radiator that's tunable. They are 12 dB less efficient than La Scalas. Both are in the corners and are powered by an amp that can put out 450 watts per channel. It is rumored NASA used several of these for sonic boom testing (VMPS claims NASA as a customer). They will barely keep up when I crank the La Scalas.

    Both together can do about what one Klipsch RSW-15 can do on 1700 watts peak.

    If you want deep bass when cranked, you need all the sub you can afford.

    John

  8. I'm not sure what you're thinking with "a more modern sound". Speakers are accurate or not. I'm biased because I have 4 La Scalas, but I think they are far better speakers than the RF-3s. Why don't you spend your $1000 on a good powered subwoofer. It will get its input from the speaker outs of your receiver. I normally use the second pair of speaker terminals to "signal" the powered sub and that way I can easily turn the sub off if I want (A+B is normal, A is no sub).

    John

  9. I've got 3 of those hand-woven, garden hose, CAT-5 speaker wires. I did them myself and probably have no more than $50 in them, plus sore fingers and a wife that thinks in certifiable! They improved the detail or clarity on my KLF-C7 a little and did nothing for my La Scalas. My theory is the relative reduction in DCR vs speaker impedance is at work. The La Scalas are 32+ ohms in the midrange, where differences are easy to hear; 1 ohm less in the cable in not much overall change. If the -C7 has a typical impedance curve, 1 ohm less in the cable vs. 7 or 8 in the midrange is a lot of relative change.

    I have always been a doubting Thomas and continue to be one, but I have some fairly expensive Vampire Wire interconnects because I heard the difference and I liked it. It could be nothing more than better mating of the preamp to the power amp, but it works for me.

    I don't believe there is anything but $$$ mojo in the truely high-end.

    John

  10. My '81/'82 La Scalas have square magnet woofers labeled K-33-E and my '87s have round magnet woofers labeled K-33-E. The '87s have a 15162 ink stamp on the cone. I can't remember the square ones having anything on the cone. Since buying the '87s I've wondered what's up.

    John

  11. I use my Sony DVP-S3000 as a DVD player and CD transport. I chose it initially for its dual lasers. It is not designed to pass DTS and will only do it if there is nothing but DTS on the disc. So, I've been thinking about a transport and/or a new DVD player. I don't doubt the Theta sounds great. How can I slip that into the house?

    John

  12. The correct voltage is 2.83. 0.283 is 10 dB lower than 2.83. It looks like your speakers are spot on. Both the EQ and the 3BX can cause clipping in narrow ranges at SPLs that normally wouldn't cause alarm on a meter measuring average outout. I fried 4 sub drivers (at the same time) about the same way and paid a $400+ stupid tax for it. I didn't hear clipping and MAY have overpowered the drivers with my amp. It turns out it was capable ot that.

    The bulbs are a variable resistor with power, the more power the more resistance they have. They have wire loops on each end making them easy to solder leads on. DJK has found a really neat, unobtrusive sonically, way to save your tweeters.

    John

  13. I don't have a problem at all with the lack of an LFE channel. All of the Pre/Pros and Receivers I've had contacts with have a sub configuration that will send low bass to a subwoofer.

    I did not see the article, but if the DVD-A can't essentially equal the performance of vinyl, I'm not interested. I think that means a very high sampling rate to ensure near perfect waveform reproduction (much better than CDs' 16 bit/44.1 kHz).

    John

  14. Klipsch is very easy to work with directly. Your damaged drivers probably can be reconed for less money. When you talk to Matt or Trey ask about that and ask about exchanging your damaged ones for a pair that are already reconed, like the auto parts store does.

    John

  15. BobG has said the KLF-C7 turned long axis vertical would make good rear channel speakers. They are obviously M-T-M configuration and should work pretty well. I like mine as a center. They absolutely will require a sub.

    How far are you from Canberra?

    John

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