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GlennyC

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Everything posted by GlennyC

  1. HP EliteDesk 800 G2 PC running Tidal Master Quality Software -> Mytek USB Cable -> iFi iPurifier2 USB filter -> Mytek Liberty DAC -> TRS/XLR Cables -> B&K Refetence 50 Preamplifier (Direct Mode) -> XLR Cables -> Accuphase A-30 Amplifier -> 14 gauge speaker wire -> Klipsch La Scala AL5s (Note: I also have a Behringer DEQ2496 between the Preamp and Amp that I can turn off to make it just a pass through. In addition on the subwoofer out of my Preamp, I have a Klipsch R-112SW subwoofer)
  2. Hate on me. Now that I’ve got my AL5s working properly, I ran an A/B test with a switch box to test for listening differences between the AL5s and my Heresy IIIs. The AL5s are more efficient than the Heresy IIIs therefore the AL5s are louder when switching to them. However, luckily I have a gain switch on my amplifier that will boost output in 6 dB increments. So, when I switch to the Heresy IIIs, I also bump the amplifier output by 6 dB. Switch to the AL5s, drop the amp by 6 dB. This gives a great comparison. Results... man for the extra $13,000 the differences are minimal. (I have a powered subwoofer to augment the low end and can’t hear above 10,000 Hz) I have to believe the differences between a La Scala II and a La Scala AL5 are even much more so minimal (to me). La Scala II is $5000 used. I paid $13,000 with tax for the AL5s. I have time to return the AL5s still. Decision to follow.
  3. This is the same graph as above with 1/3 smoothing instead of 1/12. I can see why Chris A recommends 1/6 or finer. 1/3 hides a lot of warts. Thanks to all for the great guidance. I am happy I was able to absorb a portion of it because I will be able to enhance my listening experience substantially now. Plus I was able to fix my tweeter based on the guidance. Great people on this forum!!!
  4. So, now 3 different PEQ frequencies - all below 300 Hz to match the Left and Right channels...
  5. Why not PEQ at two different frequencies for an even better match between the speakers? Right channel PEQ at 90 Hz +2.5 and at 160 Hz -4.5. Both Left and Right channels on one graph. DEQ2496 magic!!
  6. PEQ Right Channel Only at 160 Hz minus 2.5 Gain looks even better.
  7. PEQ Right Channel Only at 160 Hz minus 4.5 Gain.
  8. So, I just remeasured after checking all my connections and being meticulous about positioning the microphone in the same relative position in front of each speaker. New results look much better as far as differences between speakers goes. Positioned the microphone 16 inches in front of each speaker. I still have that Right channel peak at 160 Hz. But I will be able to PEQ that out of there. Will try that now.
  9. So I opened up my La Scala after getting to OK from tech support at Klipsch. Wire was loose to the tweeter. Easy peasy fix. Ten minutes at most. I ran the REW measurements as follows.... Red line is Right speaker. Green line is Left speaker.
  10. Thank you Chris A. I will do as you suggest and PEQ unlinked not GEQ linked. I just realized that when I get my Sunfire True Signature subwoofer back from repair I will be able to not use the preamplifier subwoofer out (not using the preamplifier crossover at all). I can send the full range of frequencies right and left channels to the DEQ2496 from the preamp and then from the DEQ2496 to the Sunfire, use the crossover in the Sunfire and return the left and right back to the amplifier. In this way I will be able to correct from about 17 Hz to 300 Hz. The only problem is I have been using XLR balanced connections between the preamplifier and the DEQ2496 and the amplifier. Between the Sunfire and the Amplifier would have to be RCA unbalanced. I will have to test how it sounds but in my experience the XLR is noticeably (significantly) better.
  11. Ok I get it. Only measure close to the speaker (1 meter or less) and not with both speakers playing. After measuring only correct below 300 Hz (to be safe). Apply corrections then remeasure. Does the DEQ2496 let you correct each channel independently? I don’t think I have been doing that. So, by hand I will average the correction* for both channels, apply and remeasure (using REW). I have been doing AUTOEQ with pink noise with the Behringer microphone (uncalibrated) connected to the DEQ2496 in the listening position. This adjusts and turns on the GEQ (in the frequency range from 60 to 17,000 Hz) for both speakers. I should set the range to 60 to 300 Hz. I am not going below 60 Hz because the DEQ2496 sits between my preamp and amp and my preamp is sending all frequencies below 55Hz to the subwoofer out. The (stereo) amp only gets 55 Hz and above. * I have a second DEQ2496. Maybe use one for each channel then I don’t have to average the corrections?
  12. When I did each individual speaker I was at 1 meter. But when I do L + R, I put the mic at listening position.
  13. Does that mean I'm a hopeless case? I do have to thank you Chris A for pushing me to measure each AL5 separately. That's the only way I would have found the tweeter problem in my right speaker.
  14. I had the AL5s about 10 feet (12 feet center to center) apart and the microphone was 12 feet back from the center point between the two speakers. I also had my subwoofer on. It kicks in below 55 Hz. And the AL5s were not angled to point the higher frequency drivers at the microphone. The speakers were straight not angled (pointed perpendicular to the line between them). So I was doing a lot of things wrong. I will remeasure with the subwoofer off and speakers angled at the microphone.
  15. I'll start with the dealer Crutchfield tech support tomorrow when they open. They may give me the tech support number at Klipsch. If it is as simple at removing the back panel of the high frequency box and then jiggling a wire, I'm down to do that. Better that than sending the high frequency box back to Klipsch.
  16. Yes... it could have loosened in shipping. But it is internal to the high frequency box of that speaker. The midrange in that box is working. Not the tweeter though.
  17. Ok, so I measured each speaker independently with a Behringer microphone 1 meter from the center of the high frequency portion of the La Scala AL5 pair. BLUE LINE - Left channel (speaker) of my AL5 pair. GREEN LINE - Right channel (speaker) of my AL5 pair. PURPLE LINE - Switched in my Heresy III for the Right speaker of my AL5 pair - all else stayed the same just the wires at the back of the speaker were moved from the AL5 to the Heresy III - then re-ran the right channel test. Looks like the crossover or the tweeter is bad on my Right speaker of my AL5 pair!!!
  18. So, before I throw my AL5s under the bus, I am experimenting with angling the speakers more or less towards the listener/SPL Meter. As the frequencies get higher they become more directional. I want to make sure I am forming a good triangle between the angle of the speakers and the listener's head (or SPL Meter). More more measurements/testing to follow. PS: Thank you Chris A for your help.
  19. So, here are my results of my comparison between the tweeters in the Heresy III and the La Scala AL5 Heresy III La Scala AL5 dB dB Hz 64.8 58.1 4000 66.6 77.5 5000 67.3 79.2 6000 66.3 76.7 7000 77.2 70.5 8000 63.7 66.9 9000 59.9 51.1 10000 51.4 43.0 11000 59.4 47.9 12000 59.1 49.5 13000 61.2 44.7 14000 59.5 53.2 15000 37.4 0 I am getting a significant drop off in SPL on the AL5s above 10000 Hz all things being equal except the speakers.
  20. For what it’s worth, this is my curve for my Heresy IIIs after equalization...
  21. Thank you all for your feedback and help. The purpose of me doing the REW frequency response curve was because I could hear no sine waves out of my La Scala AL5s above 10k Hz. I don’t need calibrated microphones to tell me that. Or, do I have to position my ears 40 inches from the speakers with absorbing material on the floor. To test whether or not something is amiss with my La Scala AL5s in the 4500 plus Hz range I will simply substitute my Heresy IIIs for the La Scala AL5s playing sine waves at 500 Hz intervals above 4500 Hz using my own ears. If I can hear signals with my Heresy IIIs and can’t with my AL5s then I have a problem with my La Scala AL5s. I will do this with a younger (31 year old) person in the room. Again my concerns was the sharp drop off of sound at 4500 Hz (coincidentally this is where the crossover directs frequencies to the tweeter on the AL5). I will run this test tomorrow. The REW screen captures purpose was to show you what I am hearing and not hearing, not to open up a can of worms on the pitfalls of frequency response testing. Again, thanks a million for the feedback. I will update again late tomorrow.
  22. No DEQ2496 But with Heresy IIIs instead of the La Scala AL5s...
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