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About Mariusz_

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    Advanced Member

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  • Location
    Poland, EU
  • My System
    Fully horn loaded system:

    Quarter Pies + Monacor SP-38/300PA
    Jabo KH72 + Faital Pro HF204
    Tuba HT + Beyma SM-115/K

    Powered by:
    Tube Yaqin MS-300C and some chip-amps

    Music delivered by:
    PC + Asus Xonar One Muse

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  1. Hello Claude I want to confirm my white QPs are doing well :-) I was trying not to change anything and focus on music. But one month ago I bought OpenDRC-DA8 by miniDSP and made a superb digital filters. Having time aligned all horns and linearising phase made the immersion even better. However I stll use very gentle 6db filter on QP relying mostly on roll-off.
  2. Speaking of a horn sub for QP. Some time ago I tried to model a sub based on QP profile. It is not too difficult to "put" a long truncated horn inside QP. At least on paper :-). I never built it because I am happy with my current system, but if anyone is interested... To simulate it in Hornresp enter s1=100 s2=500 s3=1250 s4=2250 Lenghts (conical) 100 330 60
  3. I modeled it too and it helped me to choose Beyma. Look at my simulation and the real response measured outside.
  4. Lowering the response was not my intention. By the setup I made I did extend the length and increased the mouth size but at the same time I put a special woofer into THT. By “special” I mean more musical than HT-assigned one. It is Beyma SM-115K with qts=0.25, fs=29Hz and moving mass of 121g, when recommended Dayton has qts=0.43, fs=19.5Hz and moving mass of 306g. And I got fast impulse response matching seamlessly my QPs. And it is still reasonably low player starting to sound good at 23-24Hz (when I use a single frequency generator and evaluate quality be hearing) or even from 20 Hz (when I sweep low tones and measure them with microphone). Well, and eventually it is very powerful subwoofer, so I one likes high volume levels, my THTs can make one's hair moving when listening :-).
  5. Which way did you turn the THT? Like this? No, both THTs aim towards me and they are in parallel. I also use separete amp for each THT with 0-180 phase adjustment. In practice I measured low frequency response in my listening position and made it as flat as possible correcting phase.
  6. I had a single coil for -6db at 400Hz, then moved to -6db at 700Hz and now I have no filter at all.
  7. There is TubaHT under QP hidden behind the grille. And if I someone is inspired by my finish, feel free to use it.
  8. And my QPie-based system has been finished. At last I am done with horn stands and with some minor but visible finish. Claude, thank you for initiating this project.
  9. 5 times with Nikko, 5 times with Yammi. Always the same outcome. And finally I chose Nikko which sounded better to me.
  10. When I was trying active crossover setups in my system I was measuring QPies response with different power amplifiers. One of the pair I checked was Yamaha M-4 and Nikko Alpha 130. Yamaha M-4: Power output: 120 watts per channel into 8Ω (stereo) Frequency response: 1Hz to 100kHz Total harmonic distortion: 0.005% Damping factor: 200 Input sensitivity: 1V Signal to noise ratio: 118dB Nikko Alpha 130: Power output: 100 watts per channel into 8Ω (stereo) Frequency response: 10Hz to 50kHz Total harmonic distortion: 0.03% Damping factor: 50 Input sensitivity: 1V Signal to noise ratio: 110dB I made several measurements (in my listening room with microphone placed at my listening seat) , only swapping amplifiers. Microphone, speakers, test signal were always the same. I noticed that Nikko response was consistently worse by 10db at 90 Hz field. Do you think that it is an example of damping factor influence?
  11. Try this for a Jamborette. I hope I made it well for the bifurcated profile: lenght of one path and areas of two paths summed.
  12. I modelled Jambo in Hornresp. I left the data file of it at my office PC, so wait until (European) Monday morning. And a few hours more for Jamborette as I need to recalculate its size.
  13. The above showed were my first simple calculations. Now, to be more formal, for Kappa 15C it looks like this: St=72 inches Fo=37Hz m=0.52 Sm=1325 sq inches (corner placement) Vb=40 litres So expansion area is: x Area 0 72,0 10 87,9 20 111,2 30 144,6 40 192,2 50 259,7 60 355,2 65 416,8 80 680,5 90 949,3 100 1328,7 In Hornresp it returns nice freq and SPL <chart 1>. And now the most difficult task: folding. This part is still under development :-). One of the trials is showed below. When simulated in Hornresp it returns <chart 2>. Still not bad but Hornresp knows nothing about 180 degree fold. The other way is to build a "chimney". It would be simpler, for me to make it, for air to move through only one 90 degree fold. The height including back chamber is 100 inches.
  14. I will, but now I am still comparing different ideas switching among Hornresp, my spreadsheet for horn equations and SketchUp trying to avoid 180 degree folds. On the other hand the bottom end of my project is that I am very glad of my current setup of QP+THT. There is simply not too much marginal return to achieve.
  15. I have just calculated expansion curve for Kappa 15C and flare 35Hz. The best height of the horn is about 25 inches. It does not look so cool as flat QP but gives nice response. For other woofers with smaller optimal throat area expansion curve may fit to 17 inch tall QP (like Precision Devices PD.153 ER which I modelled also). Anyway, 100 inches long horn sounds appealing. I think I will make one and check it with ears :-) black: top-loaded tall QP with Kappa 15C (25 inches) grey: top-loaded flat QP with Kappa 15C (17 inches)
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