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Dave MacKay

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  • Gender
  • Location
    Mississauga, Ontario, Canada
  • My System
    1986 La Scalas
    - Crites AA networks
    - SMAHL tweeters & lenses
    2 x THTLP subwoofer
    Bluesound Node streamer
    Yamaha R-N803 receiver

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  1. I used Rustoleum Painter's Touch 2X Paint & Primer spray paint. I found the satin "canyon black" colour to be just right.
  2. @Bacek I have updated the measurements I made about the Aiyima A07. It might be of interest to you. As you'll recall I'm driving my tri-amped La Scalas with three A07s (1 for the tweeters, 1 for the squawkers, and 1 for the woofers). Here's the post.
  3. Typically I listen at around 80-85 dB(C). At those levels I don’t hear any noise at my MLP (which is about 4m/13’ from the speaker). At lower levels, I don’t hear any noise at the mouth of the speaker, even with nothing playing. However, if I turn the gain up high I will hear a hiss. YMMV, of course.
  4. I’m running a similar config (tri-amped La Scalas with 3 Aiyima A07 amps — one for tweeters, one for squawkers, and one for woofers). Using the stock power supplies I am unable to hear any noise. I did hear noise when I tried to consolidate the three power supplies with a Meanwell LRS 600-36, so I went back to the stock power supplies. I’m very happy with how my system sounds. The level of noise is at least as good (perhaps better) than the Yamaha R-N803 I was using before I tri-amped the speakers.
  5. Why? Both 4 ohm and 8 ohm are “nominal” values and the actual impedance will span quite a range. Unless one is running the amp at its maximum (never a good idea) it shouldn’t be harmful.
  6. Impedance changes with frequency. An 8 ohm rating is a nominal figure — the actual impedance can vary significantly over the frequency range by quite a lot. Some crossovers (networks) try to normalize the impedance presented by a speaker but most don’t. Consider the K-33E woofer used in La Scala. Its impedance ranges from about 4 ohms (at around 150 Hz) to around 27 ohms (at around 45 Hz). The DCR (DC resistance) measures just under 4 ohms, but that’s a resistance figure, not impedance. Some time ago, the late (and much missed) DJK posted information that “the measured magnitude of impedance which the lipschorn presents to an amplifier … The lowest value within the audio range is 4.5 ohms and occurs at 55 Hz, while the highest value is almost 10x that amount, 42.3 ohms at 2155 Hz.” Even so, the Klipschorn is rated at 8 ohms. All amps — both tube and SS — will adjust (within reason) to the differing impedance presented by the speaker. However, tube amps may struggle to push around the low impedances more than SS. Unless you’re pushing the limits of your system, you should feel free to experiment with different impedance taps. You might try one speaker on one tap and the other on a different tap for testing. Dave
  7. +1 on using a MiniDSP 2x4HD (or similar DSP) when dealing with multiple subs. The subs can be dialled in using measurements from REW and analysis from MSO (Multi-Sub Optimizer). The resulting configuration (delays, gain, PEQs) can be exported from REW right into the MiniDSP 2x4HD. Both REW and MSO are superb pieces of shareware/freeware.
  8. Yes. Make note of what is connected to what when you unhook the AL. Then simply connect the AL3 the same way.
  9. Capacitors can deteriorate with age. A common symptom of a bad capacitor would be if it leaks or if the case is bulging. Other components, such as inductors tend not to be affected by the passage of time. Consequently, it is common to have to replace capacitors on older crossovers. Good capacitors can be had from many sources. @001 is a proponent of ones sold by JEM, but less expensive caps and caps with better specs are available.
  10. I have 2 Bill Fitzmaurice designed THTLP horn-loaded subs that accompany my La Scalas. Each is powered by a 250W DSP plate amp. Everything is integrated with a MiniDSP Flex Eight DSP. I am pleased with the setup. Here's a SPL/frequency chart of how my system performs (measured at my main listening position): Using the DSP, I boosted the frequencies <100 Hz. Even so, you can see that the system is strong all the way down to 20 Hz (I didn't measure any lower). I started with a Klipsch sub from a retailer (Best Buy) but it was anemic. I then went to an SVS SB1000 Pro which was much better but still no match for the La Scalas. The THTLP is very good but — because of my room — I couldn’t get good results with just 1. I needed two for coverage. I’ve heard good things about F-20 subwoofers but have no experience with them. As was mentioned above, Klipsch will be introducing subs this year to complement the Heritage line but specs, pricing, etc. have not yet been released.
  11. Discussion of modified speakers and non-Klipsch components is, unfortunately, discouraged/prohibited on this forum. I suggest you pose this question on the “Klipsch Korner” forum on Audiokarma.
  12. @001, it’s hilarious that you’re asking for data. What a reversal! Welcome to the dark side. 😂
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