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Everything posted by Mariusz_

  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)
  16. Claude, what do you think about this modification? By top loading and lenghtening the tube we could go down to 35-40Hz and still reach 350Hz. I made a simple model and simulation (Kappa 15C in regular and extended top-loaded QP).
  17. Yes 8ohm. And as far as I remember it shows about 15ohm at 350Hz at my horn.
  18. Very simple. Because HF204 rolls of quickly from 300hz down I only protect it from the lowest frequencies with single capacitor and attenuate it with autotransformer. It looks like Klipsch AA network for squawker but value of capacitor is set for impedance of Faital.
  19. Maybe you could try placing back chamber outside expansion line? Then it would be longer and we could fit back chamber volume to any woofer for reactance annulling.
  20. I use big round horns (Jabo KH72) at the top of Quarter Pies. I tried Faital HF200, Beyma CP750Ti, B&C DE85TN and Faital HF204 in 2-way configuration. For me HF204 wins. HF200 rolls off highs too early and needs shelving. Beyma sounds harsh and lacks low end a bit (if you need to cross at 400Hz). B&C plays like HF200, maybe slightly better at high end. And HF204 at last: it seems to be less linear than the rest but sounds best for me. Can be crossed at 350-375 Hz (in a right horn) and THD are low even at 200Hz. Highs are clear (the driver has smaller diaphragma and made of polymer - the others have 3-inch titan diaphragmas). It does not reach 20000Hz at full SPL, but 15-16kHz seems enough for most adult ears. I tried adding 3rd way and differences were subtle. Often what we perceive as high tones in music is no more than 8000Hz :-). If you needed more linear response you could use HF206 which basically is the same driver as HF204 but more flat at 2kHz region. And speaking of music listening I like live performance character even when using low and moderate volumes. HF204 and QP gives me that type of presentation. It is not mild home hi-fi type sound. HF204/QP dynamics is high and transients are played so faithfully, that you feel punch of drums and drilling sounds of strings.
  21. When I measured frequency response along mouth of QP I found out that 300-400Hz is louder at the end opposite to the woofer. So when QP is vertical with the drivers firing down one should get more top frequencies. If opposite I am afraid that high end of QPs will aim the ceiling not the listener level.
  22. They (EVM 15L and Kappa 15C) should look like this: <see chart> Notice: Voltage to EVM and Kappa is different in my model to show differences in frequency response and not in efficiency (chart 1). When crossed passively Kappa is louder by 2-2.5dB (chart 2). Black:Kappa 15C Gray: EVM 15L
  23. I should go for it anyway. Look at my chart when models and measurments are overlayed and scaled: Blue - measured QP with Monacor woofer in my room. Green - modelled Monacor in QP Red - modelled Kappa 15C in BQP In my case I don't filter QP at all and let it play all the way. My midhorn starts from 350-400Hz (1st order slope). As one can see, Kappa should give similar response.
  24. Ok I will when I am back home. As far as I remember 15C gives same bottom and earlier rolloff at top. ------------- Edited: Kappa 15C
  25. I assumed 7x13 slot, 15.5 internal height and lenght measured on axis of 3 sections.
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