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Invidiosulus

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Everything posted by Invidiosulus

  1. So you are saying that the AL5 needs a stand to not resonate? Or are you saying that it needs a stand to have the correct frequency response? What exactly do you propose would have been different if the AL5 had been on a stand. I think the measurements do a good job of showing what one can expect when listening in a real room. The review and the comments with the measurements are generally favorable.
  2. I’m sorry that you have a problem with reading comprehension. The author states that they left the AL5 on the floor because it was so heavy. The measurement with the woofer disconnected was a a standard frequency response measurement and the author is acknowledging that the floor reflections were not allowing him to get an accurate picture of the response of the speaker which is why he only included the midrange and tweeter on that graph.
  3. REW is Room EQ Wizard, a free software that can be used to help tune an audio system. It has a signal generator function that allows you to output sine waves(or white/pink noise etc) to pinpoint certain issues. If used with a calibrated microphone such as the usb style UMIK, the software can be used to run frequency sweeps and give you measured results of frequency, group delay, etc. All things that can be really handy. I believe some of the group delay and waterfall style frequency/time plots would be helpful for actually measuring resonance vs input signal. But, you really need a calibrated mic to take advantage of it.
  4. It’s getting a little chilly out here.
  5. Invidiosulus

    AI

    You gonna share that blunt or not?
  6. Typically when a material decreases in thickness the amplitude of the resonance will increase and the Q of the resonance will decrease. So not only will the resonance be louder on the thinner piece, it will be resonating across a broader frequency. I measured this on the backs of my H1 with a small piezo transducer mounted directly on the wood while running frequency sweeps in REW. Increasing the thickness will reduce the amplitude but the peaks will still be in the same place although narrower. All of which is to say, I would imagine the AL5 sidewalls would resonate at around the same center frequency as the older models since the sidewalls are approximately the same size. But since they are thicker they should resonate less and over a narrower range.
  7. Randy is full of misinformation. The top and bottom of the LS bass bin are adequately braced. It is only the large side panels that are an issue on the LS 1. Just like the 1/2” thick back panel on a Heresy 1, the side panels on an LS 1 will muddy the upper bass from its vibration if played at a louder volume. my LS cabs were stock thickness 3/4” and the braces provided a noticeable difference in clarity. Would I have gotten similar results from increasing the thickness of the sidewall? Perhaps, but the braces were a cheap and easy install compared to increasing the sidewall thickness.
  8. Do you have formation on the reflections and specifically what they caused?
  9. I mean, the non expanding section of the horn in the LS design causes unwanted results in frequency response, yet here we are decades later still using that design. It takes far less than 100 watts to excite the side walls in the original LS. Of course the industrial models and the AL5 are going to resonate less, that’s just the way physics works. The 1/2” back panel in the H1 is the same way. Bracing it or replacing it with a thicker panel improves the sound. the newer models don’t have the same issue. The original models were good but engineering and cost decisions were made that leave things less than perfect.
  10. I might have said “known to resonate” instead of “known for its resonance”. Can you feel the sidewall moving when you are hearing the issue? On my LS 1 it would become very apparent on some songs and I could feel it with my hand quite easily. As others have said, clamping some additional bracing in the outside of the cab is a cheap and reversible fix that you can easily test and back out of if you don’t think it helps. the EQ setting I posted were specified by @Chief bonehead for folks using DSP when mounting the K510(I think) on top of the LS bass bin. The sharp notch at 148Hz made a world of difference on my LS 1. If you aren’t going active EQ then just concentrate on the rest of the equation regarding placement and room modes.
  11. A second pair of Heresy’s makes a nice set of stands.
  12. Yes, they resonate. Bracing will help a lot but it won’t tame some of the irregularities in frequency response that are inherent to the LS due to compromises in the horn expansion. if you have an active DSP setup that is capable of some parametric EQ adjustments, you can try the following settings that are known to ameliorate the response of the stock LS bass bin. 87hz, Q:3.5, +5dB 148Hz, Q:8, -7dB 380Hz, Q:5.5, +2dB
  13. I wouldn’t trust any measured differences unless the speakers were both in the exact same position in the room.
  14. Oddly enough, some people would like to have a tweeter that doesn’t run out of gas past 15KhHz and can handle a little bit more power. Plenty of stuff sells for silly amounts of money just because it is old and or rare. You are deluding yourself if you think there aren’t far better modern tweeters available.
  15. There are two caps in the high pass filter and two caps in the low pass filter. If any of them are out of spec it could potentially shift the crossover points and adversely affect the sound.
  16. Invidiosulus

    Fraziers...

    I’m so intrigued by them. I really want to build a pair.
  17. Those are the Theater surround version THSR2 which didn’t come with a tweeter.
  18. The PRV WG45-50 is a great sounding 2” horn, no sanding required.
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