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Primare Knob

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About Primare Knob

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  1. Primare Knob

    Experience with DIY VPR anyone

    Crap, I thought and read it the other way around. They speak for dimensions of the steel plate as 1000*1500mm, and the commercial traps aren't bigger than that I believe. Why does one have to be bigger than the other? What happens with a steel plate that is larger than the foam? I was planning to have the foam stick out of the frame by 5mm, to keep it free, hence my testing with the sagging. I can still combine 2 cuts of 800x1200 for a single trap. I hope the 50-100mm of edge won't make it to stiff. This is not going to be a practical trap inside the room.
  2. Primare Knob

    Experience with DIY VPR anyone

    I have bought a sheet of Megasorber FM100 today and had it cut into 3 equal pieces, 800mm x 1200mm. This size will give 100mm edges on the sides and 150mm on the top and bottom. I don't know how much the steel plate can or should be bigger, but on gearslutz there was mentioning of a 100mm. They advised me to use 2 tubes of the A200 glue per full sheet of 1200mm x 2400mm. I'll use a dot pattern as I read somewhere on gearslutz that it was the best approach given in an interview with the origional designer. I'll first have to build a frame, which for the test will be build out of timber. The foam comes with an G8 sounds mesh attached to it, which seems to curve the sheet a bit. I did a quick test to see if the foam has any acoustic value below 200Hz, but it's not going to be more than any other type of absorber. Price $295 per full sheet of FM100, $20 per tube of A200 glue, ex GST.
  3. A pre pro is often a dressed down AVR, the biggest difference are found in the power supplies. The more features you have to combine in a single solution the more compromises need to made. The Audiophile world isn't the same as the HT world, both want good sound quality but HT has more reference guide lines, complicated requirements and bang to buck is far more expensive than 2 channel. There is no difference in sound quality, and equipment doesn't discriminate between music and movies. But the number of channels, and audience members, and impact makes a difference, and so does the source material. Doesn't mean that you have to follow any of the guide lines and can't enjoy a setup that isn't in line with it. Be sure to give your equipment some room to breathe, heat isn't doing it any favours. Take your time to do a proper speaker setup, that is acceptable with your other half. Find the compromises you have to make and which one you can compensate for. Don't let knowing to much get in the way of enjoyment. With 2 channels, aim for the setup that produces clear dialogue. Nothing more annoying than cranking up the volume to hear dialogue
  4. Primare Knob

    Blowing fuses on a Sanders ESL MKII

    Same answer as others. Good thing the fuse blown, test signals are hard on the amp, low impadence with high frequencies, etc, etc. A bit of a disappointment I have to say. I bought the amp specifically for its technical capabilities with ESL speakers, and stability down to 0,5 ohm. Regarding this, I am testing with 85dB sound pressure 250cm away, with speakers that should be 90dB efficient, using 512kb sweep signals. Am I doing something wrong here?
  5. Primare Knob

    Blowing fuses on a Sanders ESL MKII

    And it just happened. [emoji4]
  6. Primare Knob

    Blowing fuses on a Sanders ESL MKII

    No, still radio silence. They might be busy with CES2019
  7. If you're just starting out I would keep things simple. An AVR + Poweramp is a bit unnecessary. The improvement in the wireless LS50 will have more to do with the DSP tunning of the speaker and the lack of an analogue cross over. Don't mix this type of DSP up with the DSP in home theatre, they are the same but work in different areas. Power ratings are overrated, and have more to do with the efficiency of the speakers and the desired output sound pressure. If you run 2 speakers with perhaps a Sub, I would not put to much value in room correction. Most subs these days come with room correction, and that is where you want to use it. The rest I would leave to clever acoustic treatment and proper software to measure it. Not all seemingly problems are problematic. I would start with an AVR, and later upgrade with an integrated 2 channel amp if you desire and looking to get more out of your music. For HDMI connectivity the AVR or PrePro is king. Be careful when adding a sub to the LS50's. If you overdoing it, you will start to loose the magic of these speakers.
  8. Primare Knob

    Blowing fuses on a Sanders ESL MKII

    The fuses have been replaced and the amp is working properly. Not the first time I have been running sweeps, and have tested the speakers and amp up to 20kHz without a problem before. Don't know what went wrong this time. Could be the heat. I've contacted a service point and take them there to check it out. If there is a fuse in the speakers, I assume they are in the amplifier, or does each circuit board have a fuse as well? As I understand there are a few used in this speaker. Might be something I could check for myself.
  9. Primare Knob

    Blowing fuses on a Sanders ESL MKII

    I watch mostly movies and suspect there is more HF content in it. -20dBFS is just 85dB at listen position I can only find Cooper Bussman fuses, or the no brand JayCar fuses. Something else has happened as well than just a blown fuse. The Panel on the left Montis doesn't seem to power on. The woofer still works and the panel is producing output, but 25-30dB less. The indication led on the front isn't glowing either. I'll have to make some phone calls tomorrow.
  10. Primare Knob

    Noob's adventure into accoustics

    I have been trying to get rid of the nasty dip between 50Hz - 70Hz, and only moving the mic closer to the side wall seem to make an impact. I would guess that the problem here is SBIR. The same happens in the other graphs and sub and right speaker in a similar region. My biggest question is, how can I locate this SBIR? I have walked around the room along the side wall, at various distances with 200mm thick absorbtion, but never been able to make a difference. What forces are in play, and how do they work?
  11. Primare Knob

    Noob's adventure into accoustics

    Sub graphs generated from the Center position with Absorbtion in place. Not sure how to interpret the distortion graph, but might this explain why there is an uneven decay rate/time at 20Hz? Looking at the waterfall and decay graph, I would like to do more work on the room, but the RT60 graph doesn't seem to bad.
  12. Primare Knob

    Noob's adventure into accoustics

    Subs, before and after
  13. Primare Knob

    Noob's adventure into accoustics

    Right speaker, before and after. Var smoothing has been applied to the no Absorbtion graph to make it more readable.
  14. Primare Knob

    Noob's adventure into accoustics

    Left Speaker, before and after. Var smoothing has been applied to the no Absorbtion graph to make it more readable.
  15. Primare Knob

    Noob's adventure into accoustics

    Ok, I am going to post a bunch of pictures from measurements taken yesterday. First batch will be the Left Right and Center listen postion, before and after adding absorbtion around the room for Left, Right and Sub speakers Second batch will be of the Center listen position Subwoofer graph with absorbtion in place. I am posting all graphs that REW can produce, but not sure how to use them. Third batch is a picture of my left speaker and the influence on the 40-80Hz range with positioning. I came across this post on gearslutz (year 2010) from the author of REW. " Waterfall plots cannot be used to read decay times, unfortunately. The plot is produced by moving a window through the response and plotting the frequency content within that window. Using longer windows makes decays appear to take longer, which is at its heart a manifestation of the time/frequency trade-off of these kinds of analysis. Longer windows give increased frequency resolution, but correspondingly reduced time resolution. On the plus side, there are ways of measuring both the frequency and decay time of modal resonances with high precision, I'll include that capability in the next REW V5 beta in a few days time. " I am not sure what method he is referring to, regarding the proper interpretation of decay time. Legenda explanation: First letter L_ R_ Subs_ refers to the speaker Second letter Lpos Rpos Cpos refers to the listen postion Base refers to the untreated room Absorb refers to the absorption treatment put in place
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